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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 | ||
4836df17 JP |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
14 | ||
93f0822d DB |
15 | #include <linux/kernel.h> |
16 | #include <linux/kernel_stat.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/ktime.h> | |
19 | #include <linux/hrtimer.h> | |
20 | #include <linux/tick.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/sched.h> | |
23 | #include <linux/list.h> | |
24 | #include <linux/cpu.h> | |
25 | #include <linux/cpufreq.h> | |
26 | #include <linux/sysfs.h> | |
27 | #include <linux/types.h> | |
28 | #include <linux/fs.h> | |
29 | #include <linux/debugfs.h> | |
fbbcdc07 | 30 | #include <linux/acpi.h> |
d6472302 | 31 | #include <linux/vmalloc.h> |
93f0822d DB |
32 | #include <trace/events/power.h> |
33 | ||
34 | #include <asm/div64.h> | |
35 | #include <asm/msr.h> | |
36 | #include <asm/cpu_device_id.h> | |
64df1fdf | 37 | #include <asm/cpufeature.h> |
93f0822d | 38 | |
938d21a2 PL |
39 | #define ATOM_RATIOS 0x66a |
40 | #define ATOM_VIDS 0x66b | |
41 | #define ATOM_TURBO_RATIOS 0x66c | |
42 | #define ATOM_TURBO_VIDS 0x66d | |
61d8d2ab | 43 | |
9522a2ff SP |
44 | #ifdef CONFIG_ACPI |
45 | #include <acpi/processor.h> | |
46 | #endif | |
47 | ||
f0fe3cd7 | 48 | #define FRAC_BITS 8 |
93f0822d DB |
49 | #define int_tofp(X) ((int64_t)(X) << FRAC_BITS) |
50 | #define fp_toint(X) ((X) >> FRAC_BITS) | |
f0fe3cd7 | 51 | |
93f0822d DB |
52 | static inline int32_t mul_fp(int32_t x, int32_t y) |
53 | { | |
54 | return ((int64_t)x * (int64_t)y) >> FRAC_BITS; | |
55 | } | |
56 | ||
7180dddf | 57 | static inline int32_t div_fp(s64 x, s64 y) |
93f0822d | 58 | { |
7180dddf | 59 | return div64_s64((int64_t)x << FRAC_BITS, y); |
93f0822d DB |
60 | } |
61 | ||
d022a65e DB |
62 | static inline int ceiling_fp(int32_t x) |
63 | { | |
64 | int mask, ret; | |
65 | ||
66 | ret = fp_toint(x); | |
67 | mask = (1 << FRAC_BITS) - 1; | |
68 | if (x & mask) | |
69 | ret += 1; | |
70 | return ret; | |
71 | } | |
72 | ||
13ad7701 SP |
73 | /** |
74 | * struct sample - Store performance sample | |
75 | * @core_pct_busy: Ratio of APERF/MPERF in percent, which is actual | |
76 | * performance during last sample period | |
77 | * @busy_scaled: Scaled busy value which is used to calculate next | |
78 | * P state. This can be different than core_pct_busy | |
79 | * to account for cpu idle period | |
80 | * @aperf: Difference of actual performance frequency clock count | |
81 | * read from APERF MSR between last and current sample | |
82 | * @mperf: Difference of maximum performance frequency clock count | |
83 | * read from MPERF MSR between last and current sample | |
84 | * @tsc: Difference of time stamp counter between last and | |
85 | * current sample | |
86 | * @freq: Effective frequency calculated from APERF/MPERF | |
87 | * @time: Current time from scheduler | |
88 | * | |
89 | * This structure is used in the cpudata structure to store performance sample | |
90 | * data for choosing next P State. | |
91 | */ | |
93f0822d | 92 | struct sample { |
d253d2a5 | 93 | int32_t core_pct_busy; |
157386b6 | 94 | int32_t busy_scaled; |
93f0822d DB |
95 | u64 aperf; |
96 | u64 mperf; | |
4055fad3 | 97 | u64 tsc; |
93f0822d | 98 | int freq; |
a4675fbc | 99 | u64 time; |
93f0822d DB |
100 | }; |
101 | ||
13ad7701 SP |
102 | /** |
103 | * struct pstate_data - Store P state data | |
104 | * @current_pstate: Current requested P state | |
105 | * @min_pstate: Min P state possible for this platform | |
106 | * @max_pstate: Max P state possible for this platform | |
107 | * @max_pstate_physical:This is physical Max P state for a processor | |
108 | * This can be higher than the max_pstate which can | |
109 | * be limited by platform thermal design power limits | |
110 | * @scaling: Scaling factor to convert frequency to cpufreq | |
111 | * frequency units | |
112 | * @turbo_pstate: Max Turbo P state possible for this platform | |
113 | * | |
114 | * Stores the per cpu model P state limits and current P state. | |
115 | */ | |
93f0822d DB |
116 | struct pstate_data { |
117 | int current_pstate; | |
118 | int min_pstate; | |
119 | int max_pstate; | |
3bcc6fa9 | 120 | int max_pstate_physical; |
b27580b0 | 121 | int scaling; |
93f0822d DB |
122 | int turbo_pstate; |
123 | }; | |
124 | ||
13ad7701 SP |
125 | /** |
126 | * struct vid_data - Stores voltage information data | |
127 | * @min: VID data for this platform corresponding to | |
128 | * the lowest P state | |
129 | * @max: VID data corresponding to the highest P State. | |
130 | * @turbo: VID data for turbo P state | |
131 | * @ratio: Ratio of (vid max - vid min) / | |
132 | * (max P state - Min P State) | |
133 | * | |
134 | * Stores the voltage data for DVFS (Dynamic Voltage and Frequency Scaling) | |
135 | * This data is used in Atom platforms, where in addition to target P state, | |
136 | * the voltage data needs to be specified to select next P State. | |
137 | */ | |
007bea09 | 138 | struct vid_data { |
21855ff5 DB |
139 | int min; |
140 | int max; | |
141 | int turbo; | |
007bea09 DB |
142 | int32_t ratio; |
143 | }; | |
144 | ||
13ad7701 SP |
145 | /** |
146 | * struct _pid - Stores PID data | |
147 | * @setpoint: Target set point for busyness or performance | |
148 | * @integral: Storage for accumulated error values | |
149 | * @p_gain: PID proportional gain | |
150 | * @i_gain: PID integral gain | |
151 | * @d_gain: PID derivative gain | |
152 | * @deadband: PID deadband | |
153 | * @last_err: Last error storage for integral part of PID calculation | |
154 | * | |
155 | * Stores PID coefficients and last error for PID controller. | |
156 | */ | |
93f0822d DB |
157 | struct _pid { |
158 | int setpoint; | |
159 | int32_t integral; | |
160 | int32_t p_gain; | |
161 | int32_t i_gain; | |
162 | int32_t d_gain; | |
163 | int deadband; | |
d253d2a5 | 164 | int32_t last_err; |
93f0822d DB |
165 | }; |
166 | ||
13ad7701 SP |
167 | /** |
168 | * struct cpudata - Per CPU instance data storage | |
169 | * @cpu: CPU number for this instance data | |
170 | * @update_util: CPUFreq utility callback information | |
171 | * @pstate: Stores P state limits for this CPU | |
172 | * @vid: Stores VID limits for this CPU | |
173 | * @pid: Stores PID parameters for this CPU | |
174 | * @last_sample_time: Last Sample time | |
175 | * @prev_aperf: Last APERF value read from APERF MSR | |
176 | * @prev_mperf: Last MPERF value read from MPERF MSR | |
177 | * @prev_tsc: Last timestamp counter (TSC) value | |
178 | * @prev_cummulative_iowait: IO Wait time difference from last and | |
179 | * current sample | |
180 | * @sample: Storage for storing last Sample data | |
9522a2ff SP |
181 | * @acpi_perf_data: Stores ACPI perf information read from _PSS |
182 | * @valid_pss_table: Set to true for valid ACPI _PSS entries found | |
13ad7701 SP |
183 | * |
184 | * This structure stores per CPU instance data for all CPUs. | |
185 | */ | |
93f0822d DB |
186 | struct cpudata { |
187 | int cpu; | |
188 | ||
a4675fbc | 189 | struct update_util_data update_util; |
93f0822d | 190 | |
93f0822d | 191 | struct pstate_data pstate; |
007bea09 | 192 | struct vid_data vid; |
93f0822d | 193 | struct _pid pid; |
93f0822d | 194 | |
a4675fbc | 195 | u64 last_sample_time; |
93f0822d DB |
196 | u64 prev_aperf; |
197 | u64 prev_mperf; | |
4055fad3 | 198 | u64 prev_tsc; |
63d1d656 | 199 | u64 prev_cummulative_iowait; |
d37e2b76 | 200 | struct sample sample; |
9522a2ff SP |
201 | #ifdef CONFIG_ACPI |
202 | struct acpi_processor_performance acpi_perf_data; | |
203 | bool valid_pss_table; | |
204 | #endif | |
93f0822d DB |
205 | }; |
206 | ||
207 | static struct cpudata **all_cpu_data; | |
13ad7701 SP |
208 | |
209 | /** | |
210 | * struct pid_adjust_policy - Stores static PID configuration data | |
211 | * @sample_rate_ms: PID calculation sample rate in ms | |
212 | * @sample_rate_ns: Sample rate calculation in ns | |
213 | * @deadband: PID deadband | |
214 | * @setpoint: PID Setpoint | |
215 | * @p_gain_pct: PID proportional gain | |
216 | * @i_gain_pct: PID integral gain | |
217 | * @d_gain_pct: PID derivative gain | |
218 | * | |
219 | * Stores per CPU model static PID configuration data. | |
220 | */ | |
93f0822d DB |
221 | struct pstate_adjust_policy { |
222 | int sample_rate_ms; | |
a4675fbc | 223 | s64 sample_rate_ns; |
93f0822d DB |
224 | int deadband; |
225 | int setpoint; | |
226 | int p_gain_pct; | |
227 | int d_gain_pct; | |
228 | int i_gain_pct; | |
229 | }; | |
230 | ||
13ad7701 SP |
231 | /** |
232 | * struct pstate_funcs - Per CPU model specific callbacks | |
233 | * @get_max: Callback to get maximum non turbo effective P state | |
234 | * @get_max_physical: Callback to get maximum non turbo physical P state | |
235 | * @get_min: Callback to get minimum P state | |
236 | * @get_turbo: Callback to get turbo P state | |
237 | * @get_scaling: Callback to get frequency scaling factor | |
238 | * @get_val: Callback to convert P state to actual MSR write value | |
239 | * @get_vid: Callback to get VID data for Atom platforms | |
240 | * @get_target_pstate: Callback to a function to calculate next P state to use | |
241 | * | |
242 | * Core and Atom CPU models have different way to get P State limits. This | |
243 | * structure is used to store those callbacks. | |
244 | */ | |
016c8150 DB |
245 | struct pstate_funcs { |
246 | int (*get_max)(void); | |
3bcc6fa9 | 247 | int (*get_max_physical)(void); |
016c8150 DB |
248 | int (*get_min)(void); |
249 | int (*get_turbo)(void); | |
b27580b0 | 250 | int (*get_scaling)(void); |
fdfdb2b1 | 251 | u64 (*get_val)(struct cpudata*, int pstate); |
007bea09 | 252 | void (*get_vid)(struct cpudata *); |
157386b6 | 253 | int32_t (*get_target_pstate)(struct cpudata *); |
93f0822d DB |
254 | }; |
255 | ||
13ad7701 SP |
256 | /** |
257 | * struct cpu_defaults- Per CPU model default config data | |
258 | * @pid_policy: PID config data | |
259 | * @funcs: Callback function data | |
260 | */ | |
016c8150 DB |
261 | struct cpu_defaults { |
262 | struct pstate_adjust_policy pid_policy; | |
263 | struct pstate_funcs funcs; | |
93f0822d DB |
264 | }; |
265 | ||
157386b6 | 266 | static inline int32_t get_target_pstate_use_performance(struct cpudata *cpu); |
e70eed2b | 267 | static inline int32_t get_target_pstate_use_cpu_load(struct cpudata *cpu); |
157386b6 | 268 | |
016c8150 DB |
269 | static struct pstate_adjust_policy pid_params; |
270 | static struct pstate_funcs pstate_funcs; | |
2f86dc4c | 271 | static int hwp_active; |
016c8150 | 272 | |
9522a2ff SP |
273 | #ifdef CONFIG_ACPI |
274 | static bool acpi_ppc; | |
275 | #endif | |
13ad7701 SP |
276 | |
277 | /** | |
278 | * struct perf_limits - Store user and policy limits | |
279 | * @no_turbo: User requested turbo state from intel_pstate sysfs | |
280 | * @turbo_disabled: Platform turbo status either from msr | |
281 | * MSR_IA32_MISC_ENABLE or when maximum available pstate | |
282 | * matches the maximum turbo pstate | |
283 | * @max_perf_pct: Effective maximum performance limit in percentage, this | |
284 | * is minimum of either limits enforced by cpufreq policy | |
285 | * or limits from user set limits via intel_pstate sysfs | |
286 | * @min_perf_pct: Effective minimum performance limit in percentage, this | |
287 | * is maximum of either limits enforced by cpufreq policy | |
288 | * or limits from user set limits via intel_pstate sysfs | |
289 | * @max_perf: This is a scaled value between 0 to 255 for max_perf_pct | |
290 | * This value is used to limit max pstate | |
291 | * @min_perf: This is a scaled value between 0 to 255 for min_perf_pct | |
292 | * This value is used to limit min pstate | |
293 | * @max_policy_pct: The maximum performance in percentage enforced by | |
294 | * cpufreq setpolicy interface | |
295 | * @max_sysfs_pct: The maximum performance in percentage enforced by | |
296 | * intel pstate sysfs interface | |
297 | * @min_policy_pct: The minimum performance in percentage enforced by | |
298 | * cpufreq setpolicy interface | |
299 | * @min_sysfs_pct: The minimum performance in percentage enforced by | |
300 | * intel pstate sysfs interface | |
301 | * | |
302 | * Storage for user and policy defined limits. | |
303 | */ | |
93f0822d DB |
304 | struct perf_limits { |
305 | int no_turbo; | |
dd5fbf70 | 306 | int turbo_disabled; |
93f0822d DB |
307 | int max_perf_pct; |
308 | int min_perf_pct; | |
309 | int32_t max_perf; | |
310 | int32_t min_perf; | |
d8f469e9 DB |
311 | int max_policy_pct; |
312 | int max_sysfs_pct; | |
a0475992 KCA |
313 | int min_policy_pct; |
314 | int min_sysfs_pct; | |
93f0822d DB |
315 | }; |
316 | ||
51443fbf PB |
317 | static struct perf_limits performance_limits = { |
318 | .no_turbo = 0, | |
319 | .turbo_disabled = 0, | |
320 | .max_perf_pct = 100, | |
321 | .max_perf = int_tofp(1), | |
322 | .min_perf_pct = 100, | |
323 | .min_perf = int_tofp(1), | |
324 | .max_policy_pct = 100, | |
325 | .max_sysfs_pct = 100, | |
326 | .min_policy_pct = 0, | |
327 | .min_sysfs_pct = 0, | |
328 | }; | |
329 | ||
330 | static struct perf_limits powersave_limits = { | |
93f0822d | 331 | .no_turbo = 0, |
4521e1a0 | 332 | .turbo_disabled = 0, |
93f0822d DB |
333 | .max_perf_pct = 100, |
334 | .max_perf = int_tofp(1), | |
335 | .min_perf_pct = 0, | |
336 | .min_perf = 0, | |
d8f469e9 DB |
337 | .max_policy_pct = 100, |
338 | .max_sysfs_pct = 100, | |
a0475992 KCA |
339 | .min_policy_pct = 0, |
340 | .min_sysfs_pct = 0, | |
93f0822d DB |
341 | }; |
342 | ||
51443fbf PB |
343 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE |
344 | static struct perf_limits *limits = &performance_limits; | |
345 | #else | |
346 | static struct perf_limits *limits = &powersave_limits; | |
347 | #endif | |
348 | ||
9522a2ff | 349 | #ifdef CONFIG_ACPI |
2b3ec765 SP |
350 | |
351 | static bool intel_pstate_get_ppc_enable_status(void) | |
352 | { | |
353 | if (acpi_gbl_FADT.preferred_profile == PM_ENTERPRISE_SERVER || | |
354 | acpi_gbl_FADT.preferred_profile == PM_PERFORMANCE_SERVER) | |
355 | return true; | |
356 | ||
357 | return acpi_ppc; | |
358 | } | |
359 | ||
9522a2ff SP |
360 | /* |
361 | * The max target pstate ratio is a 8 bit value in both PLATFORM_INFO MSR and | |
362 | * in TURBO_RATIO_LIMIT MSR, which pstate driver stores in max_pstate and | |
363 | * max_turbo_pstate fields. The PERF_CTL MSR contains 16 bit value for P state | |
364 | * ratio, out of it only high 8 bits are used. For example 0x1700 is setting | |
365 | * target ratio 0x17. The _PSS control value stores in a format which can be | |
366 | * directly written to PERF_CTL MSR. But in intel_pstate driver this shift | |
367 | * occurs during write to PERF_CTL (E.g. for cores core_set_pstate()). | |
368 | * This function converts the _PSS control value to intel pstate driver format | |
369 | * for comparison and assignment. | |
370 | */ | |
371 | static int convert_to_native_pstate_format(struct cpudata *cpu, int index) | |
372 | { | |
373 | return cpu->acpi_perf_data.states[index].control >> 8; | |
374 | } | |
375 | ||
376 | static void intel_pstate_init_acpi_perf_limits(struct cpufreq_policy *policy) | |
377 | { | |
378 | struct cpudata *cpu; | |
379 | int turbo_pss_ctl; | |
380 | int ret; | |
381 | int i; | |
382 | ||
e59a8f7f SP |
383 | if (hwp_active) |
384 | return; | |
385 | ||
2b3ec765 | 386 | if (!intel_pstate_get_ppc_enable_status()) |
9522a2ff SP |
387 | return; |
388 | ||
389 | cpu = all_cpu_data[policy->cpu]; | |
390 | ||
391 | ret = acpi_processor_register_performance(&cpu->acpi_perf_data, | |
392 | policy->cpu); | |
393 | if (ret) | |
394 | return; | |
395 | ||
396 | /* | |
397 | * Check if the control value in _PSS is for PERF_CTL MSR, which should | |
398 | * guarantee that the states returned by it map to the states in our | |
399 | * list directly. | |
400 | */ | |
401 | if (cpu->acpi_perf_data.control_register.space_id != | |
402 | ACPI_ADR_SPACE_FIXED_HARDWARE) | |
403 | goto err; | |
404 | ||
405 | /* | |
406 | * If there is only one entry _PSS, simply ignore _PSS and continue as | |
407 | * usual without taking _PSS into account | |
408 | */ | |
409 | if (cpu->acpi_perf_data.state_count < 2) | |
410 | goto err; | |
411 | ||
412 | pr_debug("CPU%u - ACPI _PSS perf data\n", policy->cpu); | |
413 | for (i = 0; i < cpu->acpi_perf_data.state_count; i++) { | |
414 | pr_debug(" %cP%d: %u MHz, %u mW, 0x%x\n", | |
415 | (i == cpu->acpi_perf_data.state ? '*' : ' '), i, | |
416 | (u32) cpu->acpi_perf_data.states[i].core_frequency, | |
417 | (u32) cpu->acpi_perf_data.states[i].power, | |
418 | (u32) cpu->acpi_perf_data.states[i].control); | |
419 | } | |
420 | ||
421 | /* | |
422 | * The _PSS table doesn't contain whole turbo frequency range. | |
423 | * This just contains +1 MHZ above the max non turbo frequency, | |
424 | * with control value corresponding to max turbo ratio. But | |
425 | * when cpufreq set policy is called, it will call with this | |
426 | * max frequency, which will cause a reduced performance as | |
427 | * this driver uses real max turbo frequency as the max | |
428 | * frequency. So correct this frequency in _PSS table to | |
429 | * correct max turbo frequency based on the turbo ratio. | |
430 | * Also need to convert to MHz as _PSS freq is in MHz. | |
431 | */ | |
432 | turbo_pss_ctl = convert_to_native_pstate_format(cpu, 0); | |
433 | if (turbo_pss_ctl > cpu->pstate.max_pstate) | |
434 | cpu->acpi_perf_data.states[0].core_frequency = | |
435 | policy->cpuinfo.max_freq / 1000; | |
436 | cpu->valid_pss_table = true; | |
437 | pr_info("_PPC limits will be enforced\n"); | |
438 | ||
439 | return; | |
440 | ||
441 | err: | |
442 | cpu->valid_pss_table = false; | |
443 | acpi_processor_unregister_performance(policy->cpu); | |
444 | } | |
445 | ||
446 | static void intel_pstate_exit_perf_limits(struct cpufreq_policy *policy) | |
447 | { | |
448 | struct cpudata *cpu; | |
449 | ||
450 | cpu = all_cpu_data[policy->cpu]; | |
451 | if (!cpu->valid_pss_table) | |
452 | return; | |
453 | ||
454 | acpi_processor_unregister_performance(policy->cpu); | |
455 | } | |
456 | ||
457 | #else | |
458 | static void intel_pstate_init_acpi_perf_limits(struct cpufreq_policy *policy) | |
459 | { | |
460 | } | |
461 | ||
462 | static void intel_pstate_exit_perf_limits(struct cpufreq_policy *policy) | |
463 | { | |
464 | } | |
465 | #endif | |
466 | ||
93f0822d | 467 | static inline void pid_reset(struct _pid *pid, int setpoint, int busy, |
c410833a | 468 | int deadband, int integral) { |
b54a0dfd PL |
469 | pid->setpoint = int_tofp(setpoint); |
470 | pid->deadband = int_tofp(deadband); | |
93f0822d | 471 | pid->integral = int_tofp(integral); |
d98d099b | 472 | pid->last_err = int_tofp(setpoint) - int_tofp(busy); |
93f0822d DB |
473 | } |
474 | ||
475 | static inline void pid_p_gain_set(struct _pid *pid, int percent) | |
476 | { | |
22590efb | 477 | pid->p_gain = div_fp(percent, 100); |
93f0822d DB |
478 | } |
479 | ||
480 | static inline void pid_i_gain_set(struct _pid *pid, int percent) | |
481 | { | |
22590efb | 482 | pid->i_gain = div_fp(percent, 100); |
93f0822d DB |
483 | } |
484 | ||
485 | static inline void pid_d_gain_set(struct _pid *pid, int percent) | |
486 | { | |
22590efb | 487 | pid->d_gain = div_fp(percent, 100); |
93f0822d DB |
488 | } |
489 | ||
d253d2a5 | 490 | static signed int pid_calc(struct _pid *pid, int32_t busy) |
93f0822d | 491 | { |
d253d2a5 | 492 | signed int result; |
93f0822d DB |
493 | int32_t pterm, dterm, fp_error; |
494 | int32_t integral_limit; | |
495 | ||
b54a0dfd | 496 | fp_error = pid->setpoint - busy; |
93f0822d | 497 | |
b54a0dfd | 498 | if (abs(fp_error) <= pid->deadband) |
93f0822d DB |
499 | return 0; |
500 | ||
501 | pterm = mul_fp(pid->p_gain, fp_error); | |
502 | ||
503 | pid->integral += fp_error; | |
504 | ||
e0d4c8f8 KCA |
505 | /* |
506 | * We limit the integral here so that it will never | |
507 | * get higher than 30. This prevents it from becoming | |
508 | * too large an input over long periods of time and allows | |
509 | * it to get factored out sooner. | |
510 | * | |
511 | * The value of 30 was chosen through experimentation. | |
512 | */ | |
93f0822d DB |
513 | integral_limit = int_tofp(30); |
514 | if (pid->integral > integral_limit) | |
515 | pid->integral = integral_limit; | |
516 | if (pid->integral < -integral_limit) | |
517 | pid->integral = -integral_limit; | |
518 | ||
d253d2a5 BS |
519 | dterm = mul_fp(pid->d_gain, fp_error - pid->last_err); |
520 | pid->last_err = fp_error; | |
93f0822d DB |
521 | |
522 | result = pterm + mul_fp(pid->integral, pid->i_gain) + dterm; | |
51d211e9 | 523 | result = result + (1 << (FRAC_BITS-1)); |
93f0822d DB |
524 | return (signed int)fp_toint(result); |
525 | } | |
526 | ||
527 | static inline void intel_pstate_busy_pid_reset(struct cpudata *cpu) | |
528 | { | |
016c8150 DB |
529 | pid_p_gain_set(&cpu->pid, pid_params.p_gain_pct); |
530 | pid_d_gain_set(&cpu->pid, pid_params.d_gain_pct); | |
531 | pid_i_gain_set(&cpu->pid, pid_params.i_gain_pct); | |
93f0822d | 532 | |
2d8d1f18 | 533 | pid_reset(&cpu->pid, pid_params.setpoint, 100, pid_params.deadband, 0); |
93f0822d DB |
534 | } |
535 | ||
93f0822d DB |
536 | static inline void intel_pstate_reset_all_pid(void) |
537 | { | |
538 | unsigned int cpu; | |
845c1cbe | 539 | |
93f0822d DB |
540 | for_each_online_cpu(cpu) { |
541 | if (all_cpu_data[cpu]) | |
542 | intel_pstate_busy_pid_reset(all_cpu_data[cpu]); | |
543 | } | |
544 | } | |
545 | ||
4521e1a0 GM |
546 | static inline void update_turbo_state(void) |
547 | { | |
548 | u64 misc_en; | |
549 | struct cpudata *cpu; | |
550 | ||
551 | cpu = all_cpu_data[0]; | |
552 | rdmsrl(MSR_IA32_MISC_ENABLE, misc_en); | |
51443fbf | 553 | limits->turbo_disabled = |
4521e1a0 GM |
554 | (misc_en & MSR_IA32_MISC_ENABLE_TURBO_DISABLE || |
555 | cpu->pstate.max_pstate == cpu->pstate.turbo_pstate); | |
556 | } | |
557 | ||
41cfd64c | 558 | static void intel_pstate_hwp_set(const struct cpumask *cpumask) |
2f86dc4c | 559 | { |
74da56ce KCA |
560 | int min, hw_min, max, hw_max, cpu, range, adj_range; |
561 | u64 value, cap; | |
562 | ||
563 | rdmsrl(MSR_HWP_CAPABILITIES, cap); | |
564 | hw_min = HWP_LOWEST_PERF(cap); | |
565 | hw_max = HWP_HIGHEST_PERF(cap); | |
566 | range = hw_max - hw_min; | |
2f86dc4c | 567 | |
41cfd64c | 568 | for_each_cpu(cpu, cpumask) { |
2f86dc4c | 569 | rdmsrl_on_cpu(cpu, MSR_HWP_REQUEST, &value); |
51443fbf | 570 | adj_range = limits->min_perf_pct * range / 100; |
74da56ce | 571 | min = hw_min + adj_range; |
2f86dc4c DB |
572 | value &= ~HWP_MIN_PERF(~0L); |
573 | value |= HWP_MIN_PERF(min); | |
574 | ||
51443fbf | 575 | adj_range = limits->max_perf_pct * range / 100; |
74da56ce | 576 | max = hw_min + adj_range; |
51443fbf | 577 | if (limits->no_turbo) { |
74da56ce KCA |
578 | hw_max = HWP_GUARANTEED_PERF(cap); |
579 | if (hw_max < max) | |
580 | max = hw_max; | |
2f86dc4c DB |
581 | } |
582 | ||
583 | value &= ~HWP_MAX_PERF(~0L); | |
584 | value |= HWP_MAX_PERF(max); | |
585 | wrmsrl_on_cpu(cpu, MSR_HWP_REQUEST, value); | |
586 | } | |
41cfd64c | 587 | } |
2f86dc4c | 588 | |
ba41e1bc RW |
589 | static int intel_pstate_hwp_set_policy(struct cpufreq_policy *policy) |
590 | { | |
591 | if (hwp_active) | |
592 | intel_pstate_hwp_set(policy->cpus); | |
593 | ||
594 | return 0; | |
595 | } | |
596 | ||
41cfd64c VK |
597 | static void intel_pstate_hwp_set_online_cpus(void) |
598 | { | |
599 | get_online_cpus(); | |
600 | intel_pstate_hwp_set(cpu_online_mask); | |
2f86dc4c DB |
601 | put_online_cpus(); |
602 | } | |
603 | ||
93f0822d DB |
604 | /************************** debugfs begin ************************/ |
605 | static int pid_param_set(void *data, u64 val) | |
606 | { | |
607 | *(u32 *)data = val; | |
608 | intel_pstate_reset_all_pid(); | |
609 | return 0; | |
610 | } | |
845c1cbe | 611 | |
93f0822d DB |
612 | static int pid_param_get(void *data, u64 *val) |
613 | { | |
614 | *val = *(u32 *)data; | |
615 | return 0; | |
616 | } | |
2d8d1f18 | 617 | DEFINE_SIMPLE_ATTRIBUTE(fops_pid_param, pid_param_get, pid_param_set, "%llu\n"); |
93f0822d DB |
618 | |
619 | struct pid_param { | |
620 | char *name; | |
621 | void *value; | |
622 | }; | |
623 | ||
624 | static struct pid_param pid_files[] = { | |
016c8150 DB |
625 | {"sample_rate_ms", &pid_params.sample_rate_ms}, |
626 | {"d_gain_pct", &pid_params.d_gain_pct}, | |
627 | {"i_gain_pct", &pid_params.i_gain_pct}, | |
628 | {"deadband", &pid_params.deadband}, | |
629 | {"setpoint", &pid_params.setpoint}, | |
630 | {"p_gain_pct", &pid_params.p_gain_pct}, | |
93f0822d DB |
631 | {NULL, NULL} |
632 | }; | |
633 | ||
317dd50e | 634 | static void __init intel_pstate_debug_expose_params(void) |
93f0822d | 635 | { |
317dd50e | 636 | struct dentry *debugfs_parent; |
93f0822d DB |
637 | int i = 0; |
638 | ||
2f86dc4c DB |
639 | if (hwp_active) |
640 | return; | |
93f0822d DB |
641 | debugfs_parent = debugfs_create_dir("pstate_snb", NULL); |
642 | if (IS_ERR_OR_NULL(debugfs_parent)) | |
643 | return; | |
644 | while (pid_files[i].name) { | |
645 | debugfs_create_file(pid_files[i].name, 0660, | |
c410833a SK |
646 | debugfs_parent, pid_files[i].value, |
647 | &fops_pid_param); | |
93f0822d DB |
648 | i++; |
649 | } | |
650 | } | |
651 | ||
652 | /************************** debugfs end ************************/ | |
653 | ||
654 | /************************** sysfs begin ************************/ | |
655 | #define show_one(file_name, object) \ | |
656 | static ssize_t show_##file_name \ | |
657 | (struct kobject *kobj, struct attribute *attr, char *buf) \ | |
658 | { \ | |
51443fbf | 659 | return sprintf(buf, "%u\n", limits->object); \ |
93f0822d DB |
660 | } |
661 | ||
d01b1f48 KCA |
662 | static ssize_t show_turbo_pct(struct kobject *kobj, |
663 | struct attribute *attr, char *buf) | |
664 | { | |
665 | struct cpudata *cpu; | |
666 | int total, no_turbo, turbo_pct; | |
667 | uint32_t turbo_fp; | |
668 | ||
669 | cpu = all_cpu_data[0]; | |
670 | ||
671 | total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1; | |
672 | no_turbo = cpu->pstate.max_pstate - cpu->pstate.min_pstate + 1; | |
22590efb | 673 | turbo_fp = div_fp(no_turbo, total); |
d01b1f48 KCA |
674 | turbo_pct = 100 - fp_toint(mul_fp(turbo_fp, int_tofp(100))); |
675 | return sprintf(buf, "%u\n", turbo_pct); | |
676 | } | |
677 | ||
0522424e KCA |
678 | static ssize_t show_num_pstates(struct kobject *kobj, |
679 | struct attribute *attr, char *buf) | |
680 | { | |
681 | struct cpudata *cpu; | |
682 | int total; | |
683 | ||
684 | cpu = all_cpu_data[0]; | |
685 | total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1; | |
686 | return sprintf(buf, "%u\n", total); | |
687 | } | |
688 | ||
4521e1a0 GM |
689 | static ssize_t show_no_turbo(struct kobject *kobj, |
690 | struct attribute *attr, char *buf) | |
691 | { | |
692 | ssize_t ret; | |
693 | ||
694 | update_turbo_state(); | |
51443fbf PB |
695 | if (limits->turbo_disabled) |
696 | ret = sprintf(buf, "%u\n", limits->turbo_disabled); | |
4521e1a0 | 697 | else |
51443fbf | 698 | ret = sprintf(buf, "%u\n", limits->no_turbo); |
4521e1a0 GM |
699 | |
700 | return ret; | |
701 | } | |
702 | ||
93f0822d | 703 | static ssize_t store_no_turbo(struct kobject *a, struct attribute *b, |
c410833a | 704 | const char *buf, size_t count) |
93f0822d DB |
705 | { |
706 | unsigned int input; | |
707 | int ret; | |
845c1cbe | 708 | |
93f0822d DB |
709 | ret = sscanf(buf, "%u", &input); |
710 | if (ret != 1) | |
711 | return -EINVAL; | |
4521e1a0 GM |
712 | |
713 | update_turbo_state(); | |
51443fbf | 714 | if (limits->turbo_disabled) { |
4836df17 | 715 | pr_warn("Turbo disabled by BIOS or unavailable on processor\n"); |
4521e1a0 | 716 | return -EPERM; |
dd5fbf70 | 717 | } |
2f86dc4c | 718 | |
51443fbf | 719 | limits->no_turbo = clamp_t(int, input, 0, 1); |
4521e1a0 | 720 | |
2f86dc4c | 721 | if (hwp_active) |
41cfd64c | 722 | intel_pstate_hwp_set_online_cpus(); |
2f86dc4c | 723 | |
93f0822d DB |
724 | return count; |
725 | } | |
726 | ||
727 | static ssize_t store_max_perf_pct(struct kobject *a, struct attribute *b, | |
c410833a | 728 | const char *buf, size_t count) |
93f0822d DB |
729 | { |
730 | unsigned int input; | |
731 | int ret; | |
845c1cbe | 732 | |
93f0822d DB |
733 | ret = sscanf(buf, "%u", &input); |
734 | if (ret != 1) | |
735 | return -EINVAL; | |
736 | ||
51443fbf PB |
737 | limits->max_sysfs_pct = clamp_t(int, input, 0 , 100); |
738 | limits->max_perf_pct = min(limits->max_policy_pct, | |
739 | limits->max_sysfs_pct); | |
740 | limits->max_perf_pct = max(limits->min_policy_pct, | |
741 | limits->max_perf_pct); | |
742 | limits->max_perf_pct = max(limits->min_perf_pct, | |
743 | limits->max_perf_pct); | |
22590efb | 744 | limits->max_perf = div_fp(limits->max_perf_pct, 100); |
845c1cbe | 745 | |
2f86dc4c | 746 | if (hwp_active) |
41cfd64c | 747 | intel_pstate_hwp_set_online_cpus(); |
93f0822d DB |
748 | return count; |
749 | } | |
750 | ||
751 | static ssize_t store_min_perf_pct(struct kobject *a, struct attribute *b, | |
c410833a | 752 | const char *buf, size_t count) |
93f0822d DB |
753 | { |
754 | unsigned int input; | |
755 | int ret; | |
845c1cbe | 756 | |
93f0822d DB |
757 | ret = sscanf(buf, "%u", &input); |
758 | if (ret != 1) | |
759 | return -EINVAL; | |
a0475992 | 760 | |
51443fbf PB |
761 | limits->min_sysfs_pct = clamp_t(int, input, 0 , 100); |
762 | limits->min_perf_pct = max(limits->min_policy_pct, | |
763 | limits->min_sysfs_pct); | |
764 | limits->min_perf_pct = min(limits->max_policy_pct, | |
765 | limits->min_perf_pct); | |
766 | limits->min_perf_pct = min(limits->max_perf_pct, | |
767 | limits->min_perf_pct); | |
22590efb | 768 | limits->min_perf = div_fp(limits->min_perf_pct, 100); |
93f0822d | 769 | |
2f86dc4c | 770 | if (hwp_active) |
41cfd64c | 771 | intel_pstate_hwp_set_online_cpus(); |
93f0822d DB |
772 | return count; |
773 | } | |
774 | ||
93f0822d DB |
775 | show_one(max_perf_pct, max_perf_pct); |
776 | show_one(min_perf_pct, min_perf_pct); | |
777 | ||
778 | define_one_global_rw(no_turbo); | |
779 | define_one_global_rw(max_perf_pct); | |
780 | define_one_global_rw(min_perf_pct); | |
d01b1f48 | 781 | define_one_global_ro(turbo_pct); |
0522424e | 782 | define_one_global_ro(num_pstates); |
93f0822d DB |
783 | |
784 | static struct attribute *intel_pstate_attributes[] = { | |
785 | &no_turbo.attr, | |
786 | &max_perf_pct.attr, | |
787 | &min_perf_pct.attr, | |
d01b1f48 | 788 | &turbo_pct.attr, |
0522424e | 789 | &num_pstates.attr, |
93f0822d DB |
790 | NULL |
791 | }; | |
792 | ||
793 | static struct attribute_group intel_pstate_attr_group = { | |
794 | .attrs = intel_pstate_attributes, | |
795 | }; | |
93f0822d | 796 | |
317dd50e | 797 | static void __init intel_pstate_sysfs_expose_params(void) |
93f0822d | 798 | { |
317dd50e | 799 | struct kobject *intel_pstate_kobject; |
93f0822d DB |
800 | int rc; |
801 | ||
802 | intel_pstate_kobject = kobject_create_and_add("intel_pstate", | |
803 | &cpu_subsys.dev_root->kobj); | |
804 | BUG_ON(!intel_pstate_kobject); | |
2d8d1f18 | 805 | rc = sysfs_create_group(intel_pstate_kobject, &intel_pstate_attr_group); |
93f0822d DB |
806 | BUG_ON(rc); |
807 | } | |
93f0822d | 808 | /************************** sysfs end ************************/ |
2f86dc4c | 809 | |
ba88d433 | 810 | static void intel_pstate_hwp_enable(struct cpudata *cpudata) |
2f86dc4c | 811 | { |
f05c9665 SP |
812 | /* First disable HWP notification interrupt as we don't process them */ |
813 | wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x00); | |
814 | ||
ba88d433 | 815 | wrmsrl_on_cpu(cpudata->cpu, MSR_PM_ENABLE, 0x1); |
2f86dc4c DB |
816 | } |
817 | ||
938d21a2 | 818 | static int atom_get_min_pstate(void) |
19e77c28 DB |
819 | { |
820 | u64 value; | |
845c1cbe | 821 | |
938d21a2 | 822 | rdmsrl(ATOM_RATIOS, value); |
c16ed060 | 823 | return (value >> 8) & 0x7F; |
19e77c28 DB |
824 | } |
825 | ||
938d21a2 | 826 | static int atom_get_max_pstate(void) |
19e77c28 DB |
827 | { |
828 | u64 value; | |
845c1cbe | 829 | |
938d21a2 | 830 | rdmsrl(ATOM_RATIOS, value); |
c16ed060 | 831 | return (value >> 16) & 0x7F; |
19e77c28 | 832 | } |
93f0822d | 833 | |
938d21a2 | 834 | static int atom_get_turbo_pstate(void) |
61d8d2ab DB |
835 | { |
836 | u64 value; | |
845c1cbe | 837 | |
938d21a2 | 838 | rdmsrl(ATOM_TURBO_RATIOS, value); |
c16ed060 | 839 | return value & 0x7F; |
61d8d2ab DB |
840 | } |
841 | ||
fdfdb2b1 | 842 | static u64 atom_get_val(struct cpudata *cpudata, int pstate) |
007bea09 DB |
843 | { |
844 | u64 val; | |
845 | int32_t vid_fp; | |
846 | u32 vid; | |
847 | ||
144c8e17 | 848 | val = (u64)pstate << 8; |
51443fbf | 849 | if (limits->no_turbo && !limits->turbo_disabled) |
007bea09 DB |
850 | val |= (u64)1 << 32; |
851 | ||
852 | vid_fp = cpudata->vid.min + mul_fp( | |
853 | int_tofp(pstate - cpudata->pstate.min_pstate), | |
854 | cpudata->vid.ratio); | |
855 | ||
856 | vid_fp = clamp_t(int32_t, vid_fp, cpudata->vid.min, cpudata->vid.max); | |
d022a65e | 857 | vid = ceiling_fp(vid_fp); |
007bea09 | 858 | |
21855ff5 DB |
859 | if (pstate > cpudata->pstate.max_pstate) |
860 | vid = cpudata->vid.turbo; | |
861 | ||
fdfdb2b1 | 862 | return val | vid; |
007bea09 DB |
863 | } |
864 | ||
1421df63 | 865 | static int silvermont_get_scaling(void) |
b27580b0 DB |
866 | { |
867 | u64 value; | |
868 | int i; | |
1421df63 PL |
869 | /* Defined in Table 35-6 from SDM (Sept 2015) */ |
870 | static int silvermont_freq_table[] = { | |
871 | 83300, 100000, 133300, 116700, 80000}; | |
b27580b0 DB |
872 | |
873 | rdmsrl(MSR_FSB_FREQ, value); | |
1421df63 PL |
874 | i = value & 0x7; |
875 | WARN_ON(i > 4); | |
b27580b0 | 876 | |
1421df63 PL |
877 | return silvermont_freq_table[i]; |
878 | } | |
b27580b0 | 879 | |
1421df63 PL |
880 | static int airmont_get_scaling(void) |
881 | { | |
882 | u64 value; | |
883 | int i; | |
884 | /* Defined in Table 35-10 from SDM (Sept 2015) */ | |
885 | static int airmont_freq_table[] = { | |
886 | 83300, 100000, 133300, 116700, 80000, | |
887 | 93300, 90000, 88900, 87500}; | |
888 | ||
889 | rdmsrl(MSR_FSB_FREQ, value); | |
890 | i = value & 0xF; | |
891 | WARN_ON(i > 8); | |
892 | ||
893 | return airmont_freq_table[i]; | |
b27580b0 DB |
894 | } |
895 | ||
938d21a2 | 896 | static void atom_get_vid(struct cpudata *cpudata) |
007bea09 DB |
897 | { |
898 | u64 value; | |
899 | ||
938d21a2 | 900 | rdmsrl(ATOM_VIDS, value); |
c16ed060 DB |
901 | cpudata->vid.min = int_tofp((value >> 8) & 0x7f); |
902 | cpudata->vid.max = int_tofp((value >> 16) & 0x7f); | |
007bea09 DB |
903 | cpudata->vid.ratio = div_fp( |
904 | cpudata->vid.max - cpudata->vid.min, | |
905 | int_tofp(cpudata->pstate.max_pstate - | |
906 | cpudata->pstate.min_pstate)); | |
21855ff5 | 907 | |
938d21a2 | 908 | rdmsrl(ATOM_TURBO_VIDS, value); |
21855ff5 | 909 | cpudata->vid.turbo = value & 0x7f; |
007bea09 DB |
910 | } |
911 | ||
016c8150 | 912 | static int core_get_min_pstate(void) |
93f0822d DB |
913 | { |
914 | u64 value; | |
845c1cbe | 915 | |
05e99c8c | 916 | rdmsrl(MSR_PLATFORM_INFO, value); |
93f0822d DB |
917 | return (value >> 40) & 0xFF; |
918 | } | |
919 | ||
3bcc6fa9 | 920 | static int core_get_max_pstate_physical(void) |
93f0822d DB |
921 | { |
922 | u64 value; | |
845c1cbe | 923 | |
05e99c8c | 924 | rdmsrl(MSR_PLATFORM_INFO, value); |
93f0822d DB |
925 | return (value >> 8) & 0xFF; |
926 | } | |
927 | ||
016c8150 | 928 | static int core_get_max_pstate(void) |
93f0822d | 929 | { |
6a35fc2d SP |
930 | u64 tar; |
931 | u64 plat_info; | |
932 | int max_pstate; | |
933 | int err; | |
934 | ||
935 | rdmsrl(MSR_PLATFORM_INFO, plat_info); | |
936 | max_pstate = (plat_info >> 8) & 0xFF; | |
937 | ||
938 | err = rdmsrl_safe(MSR_TURBO_ACTIVATION_RATIO, &tar); | |
939 | if (!err) { | |
940 | /* Do some sanity checking for safety */ | |
941 | if (plat_info & 0x600000000) { | |
942 | u64 tdp_ctrl; | |
943 | u64 tdp_ratio; | |
944 | int tdp_msr; | |
945 | ||
946 | err = rdmsrl_safe(MSR_CONFIG_TDP_CONTROL, &tdp_ctrl); | |
947 | if (err) | |
948 | goto skip_tar; | |
949 | ||
950 | tdp_msr = MSR_CONFIG_TDP_NOMINAL + tdp_ctrl; | |
951 | err = rdmsrl_safe(tdp_msr, &tdp_ratio); | |
952 | if (err) | |
953 | goto skip_tar; | |
954 | ||
1becf035 SP |
955 | /* For level 1 and 2, bits[23:16] contain the ratio */ |
956 | if (tdp_ctrl) | |
957 | tdp_ratio >>= 16; | |
958 | ||
959 | tdp_ratio &= 0xff; /* ratios are only 8 bits long */ | |
6a35fc2d SP |
960 | if (tdp_ratio - 1 == tar) { |
961 | max_pstate = tar; | |
962 | pr_debug("max_pstate=TAC %x\n", max_pstate); | |
963 | } else { | |
964 | goto skip_tar; | |
965 | } | |
966 | } | |
967 | } | |
845c1cbe | 968 | |
6a35fc2d SP |
969 | skip_tar: |
970 | return max_pstate; | |
93f0822d DB |
971 | } |
972 | ||
016c8150 | 973 | static int core_get_turbo_pstate(void) |
93f0822d DB |
974 | { |
975 | u64 value; | |
976 | int nont, ret; | |
845c1cbe | 977 | |
05e99c8c | 978 | rdmsrl(MSR_NHM_TURBO_RATIO_LIMIT, value); |
016c8150 | 979 | nont = core_get_max_pstate(); |
285cb990 | 980 | ret = (value) & 255; |
93f0822d DB |
981 | if (ret <= nont) |
982 | ret = nont; | |
983 | return ret; | |
984 | } | |
985 | ||
b27580b0 DB |
986 | static inline int core_get_scaling(void) |
987 | { | |
988 | return 100000; | |
989 | } | |
990 | ||
fdfdb2b1 | 991 | static u64 core_get_val(struct cpudata *cpudata, int pstate) |
016c8150 DB |
992 | { |
993 | u64 val; | |
994 | ||
144c8e17 | 995 | val = (u64)pstate << 8; |
51443fbf | 996 | if (limits->no_turbo && !limits->turbo_disabled) |
016c8150 DB |
997 | val |= (u64)1 << 32; |
998 | ||
fdfdb2b1 | 999 | return val; |
016c8150 DB |
1000 | } |
1001 | ||
b34ef932 DC |
1002 | static int knl_get_turbo_pstate(void) |
1003 | { | |
1004 | u64 value; | |
1005 | int nont, ret; | |
1006 | ||
1007 | rdmsrl(MSR_NHM_TURBO_RATIO_LIMIT, value); | |
1008 | nont = core_get_max_pstate(); | |
1009 | ret = (((value) >> 8) & 0xFF); | |
1010 | if (ret <= nont) | |
1011 | ret = nont; | |
1012 | return ret; | |
1013 | } | |
1014 | ||
016c8150 DB |
1015 | static struct cpu_defaults core_params = { |
1016 | .pid_policy = { | |
1017 | .sample_rate_ms = 10, | |
1018 | .deadband = 0, | |
1019 | .setpoint = 97, | |
1020 | .p_gain_pct = 20, | |
1021 | .d_gain_pct = 0, | |
1022 | .i_gain_pct = 0, | |
1023 | }, | |
1024 | .funcs = { | |
1025 | .get_max = core_get_max_pstate, | |
3bcc6fa9 | 1026 | .get_max_physical = core_get_max_pstate_physical, |
016c8150 DB |
1027 | .get_min = core_get_min_pstate, |
1028 | .get_turbo = core_get_turbo_pstate, | |
b27580b0 | 1029 | .get_scaling = core_get_scaling, |
fdfdb2b1 | 1030 | .get_val = core_get_val, |
157386b6 | 1031 | .get_target_pstate = get_target_pstate_use_performance, |
016c8150 DB |
1032 | }, |
1033 | }; | |
1034 | ||
1421df63 PL |
1035 | static struct cpu_defaults silvermont_params = { |
1036 | .pid_policy = { | |
1037 | .sample_rate_ms = 10, | |
1038 | .deadband = 0, | |
1039 | .setpoint = 60, | |
1040 | .p_gain_pct = 14, | |
1041 | .d_gain_pct = 0, | |
1042 | .i_gain_pct = 4, | |
1043 | }, | |
1044 | .funcs = { | |
1045 | .get_max = atom_get_max_pstate, | |
1046 | .get_max_physical = atom_get_max_pstate, | |
1047 | .get_min = atom_get_min_pstate, | |
1048 | .get_turbo = atom_get_turbo_pstate, | |
fdfdb2b1 | 1049 | .get_val = atom_get_val, |
1421df63 PL |
1050 | .get_scaling = silvermont_get_scaling, |
1051 | .get_vid = atom_get_vid, | |
e70eed2b | 1052 | .get_target_pstate = get_target_pstate_use_cpu_load, |
1421df63 PL |
1053 | }, |
1054 | }; | |
1055 | ||
1056 | static struct cpu_defaults airmont_params = { | |
19e77c28 DB |
1057 | .pid_policy = { |
1058 | .sample_rate_ms = 10, | |
1059 | .deadband = 0, | |
6a82ba6d | 1060 | .setpoint = 60, |
19e77c28 DB |
1061 | .p_gain_pct = 14, |
1062 | .d_gain_pct = 0, | |
1063 | .i_gain_pct = 4, | |
1064 | }, | |
1065 | .funcs = { | |
938d21a2 PL |
1066 | .get_max = atom_get_max_pstate, |
1067 | .get_max_physical = atom_get_max_pstate, | |
1068 | .get_min = atom_get_min_pstate, | |
1069 | .get_turbo = atom_get_turbo_pstate, | |
fdfdb2b1 | 1070 | .get_val = atom_get_val, |
1421df63 | 1071 | .get_scaling = airmont_get_scaling, |
938d21a2 | 1072 | .get_vid = atom_get_vid, |
e70eed2b | 1073 | .get_target_pstate = get_target_pstate_use_cpu_load, |
19e77c28 DB |
1074 | }, |
1075 | }; | |
1076 | ||
b34ef932 DC |
1077 | static struct cpu_defaults knl_params = { |
1078 | .pid_policy = { | |
1079 | .sample_rate_ms = 10, | |
1080 | .deadband = 0, | |
1081 | .setpoint = 97, | |
1082 | .p_gain_pct = 20, | |
1083 | .d_gain_pct = 0, | |
1084 | .i_gain_pct = 0, | |
1085 | }, | |
1086 | .funcs = { | |
1087 | .get_max = core_get_max_pstate, | |
3bcc6fa9 | 1088 | .get_max_physical = core_get_max_pstate_physical, |
b34ef932 DC |
1089 | .get_min = core_get_min_pstate, |
1090 | .get_turbo = knl_get_turbo_pstate, | |
69cefc27 | 1091 | .get_scaling = core_get_scaling, |
fdfdb2b1 | 1092 | .get_val = core_get_val, |
157386b6 | 1093 | .get_target_pstate = get_target_pstate_use_performance, |
b34ef932 DC |
1094 | }, |
1095 | }; | |
1096 | ||
93f0822d DB |
1097 | static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max) |
1098 | { | |
1099 | int max_perf = cpu->pstate.turbo_pstate; | |
7244cb62 | 1100 | int max_perf_adj; |
93f0822d | 1101 | int min_perf; |
845c1cbe | 1102 | |
51443fbf | 1103 | if (limits->no_turbo || limits->turbo_disabled) |
93f0822d DB |
1104 | max_perf = cpu->pstate.max_pstate; |
1105 | ||
e0d4c8f8 KCA |
1106 | /* |
1107 | * performance can be limited by user through sysfs, by cpufreq | |
1108 | * policy, or by cpu specific default values determined through | |
1109 | * experimentation. | |
1110 | */ | |
a158bed5 | 1111 | max_perf_adj = fp_toint(max_perf * limits->max_perf); |
799281a3 RW |
1112 | *max = clamp_t(int, max_perf_adj, |
1113 | cpu->pstate.min_pstate, cpu->pstate.turbo_pstate); | |
93f0822d | 1114 | |
a158bed5 | 1115 | min_perf = fp_toint(max_perf * limits->min_perf); |
799281a3 | 1116 | *min = clamp_t(int, min_perf, cpu->pstate.min_pstate, max_perf); |
93f0822d DB |
1117 | } |
1118 | ||
fdfdb2b1 | 1119 | static inline void intel_pstate_record_pstate(struct cpudata *cpu, int pstate) |
93f0822d | 1120 | { |
b27580b0 | 1121 | trace_cpu_frequency(pstate * cpu->pstate.scaling, cpu->cpu); |
93f0822d | 1122 | cpu->pstate.current_pstate = pstate; |
fdfdb2b1 | 1123 | } |
93f0822d | 1124 | |
fdfdb2b1 RW |
1125 | static void intel_pstate_set_min_pstate(struct cpudata *cpu) |
1126 | { | |
1127 | int pstate = cpu->pstate.min_pstate; | |
1128 | ||
1129 | intel_pstate_record_pstate(cpu, pstate); | |
1130 | /* | |
1131 | * Generally, there is no guarantee that this code will always run on | |
1132 | * the CPU being updated, so force the register update to run on the | |
1133 | * right CPU. | |
1134 | */ | |
1135 | wrmsrl_on_cpu(cpu->cpu, MSR_IA32_PERF_CTL, | |
1136 | pstate_funcs.get_val(cpu, pstate)); | |
93f0822d DB |
1137 | } |
1138 | ||
93f0822d DB |
1139 | static void intel_pstate_get_cpu_pstates(struct cpudata *cpu) |
1140 | { | |
016c8150 DB |
1141 | cpu->pstate.min_pstate = pstate_funcs.get_min(); |
1142 | cpu->pstate.max_pstate = pstate_funcs.get_max(); | |
3bcc6fa9 | 1143 | cpu->pstate.max_pstate_physical = pstate_funcs.get_max_physical(); |
016c8150 | 1144 | cpu->pstate.turbo_pstate = pstate_funcs.get_turbo(); |
b27580b0 | 1145 | cpu->pstate.scaling = pstate_funcs.get_scaling(); |
93f0822d | 1146 | |
007bea09 DB |
1147 | if (pstate_funcs.get_vid) |
1148 | pstate_funcs.get_vid(cpu); | |
fdfdb2b1 RW |
1149 | |
1150 | intel_pstate_set_min_pstate(cpu); | |
93f0822d DB |
1151 | } |
1152 | ||
6b17ddb2 | 1153 | static inline void intel_pstate_calc_busy(struct cpudata *cpu) |
93f0822d | 1154 | { |
6b17ddb2 | 1155 | struct sample *sample = &cpu->sample; |
bf810222 | 1156 | int64_t core_pct; |
93f0822d | 1157 | |
22590efb RW |
1158 | core_pct = sample->aperf * int_tofp(100); |
1159 | core_pct = div64_u64(core_pct, sample->mperf); | |
e66c1768 | 1160 | |
bf810222 | 1161 | sample->core_pct_busy = (int32_t)core_pct; |
93f0822d DB |
1162 | } |
1163 | ||
4fec7ad5 | 1164 | static inline bool intel_pstate_sample(struct cpudata *cpu, u64 time) |
93f0822d | 1165 | { |
93f0822d | 1166 | u64 aperf, mperf; |
4ab60c3f | 1167 | unsigned long flags; |
4055fad3 | 1168 | u64 tsc; |
93f0822d | 1169 | |
4ab60c3f | 1170 | local_irq_save(flags); |
93f0822d DB |
1171 | rdmsrl(MSR_IA32_APERF, aperf); |
1172 | rdmsrl(MSR_IA32_MPERF, mperf); | |
e70eed2b | 1173 | tsc = rdtsc(); |
4fec7ad5 | 1174 | if (cpu->prev_mperf == mperf || cpu->prev_tsc == tsc) { |
8e601a9f | 1175 | local_irq_restore(flags); |
4fec7ad5 | 1176 | return false; |
8e601a9f | 1177 | } |
4ab60c3f | 1178 | local_irq_restore(flags); |
b69880f9 | 1179 | |
c4ee841f | 1180 | cpu->last_sample_time = cpu->sample.time; |
a4675fbc | 1181 | cpu->sample.time = time; |
d37e2b76 DB |
1182 | cpu->sample.aperf = aperf; |
1183 | cpu->sample.mperf = mperf; | |
4055fad3 | 1184 | cpu->sample.tsc = tsc; |
d37e2b76 DB |
1185 | cpu->sample.aperf -= cpu->prev_aperf; |
1186 | cpu->sample.mperf -= cpu->prev_mperf; | |
4055fad3 | 1187 | cpu->sample.tsc -= cpu->prev_tsc; |
1abc4b20 | 1188 | |
93f0822d DB |
1189 | cpu->prev_aperf = aperf; |
1190 | cpu->prev_mperf = mperf; | |
4055fad3 | 1191 | cpu->prev_tsc = tsc; |
febce40f RW |
1192 | /* |
1193 | * First time this function is invoked in a given cycle, all of the | |
1194 | * previous sample data fields are equal to zero or stale and they must | |
1195 | * be populated with meaningful numbers for things to work, so assume | |
1196 | * that sample.time will always be reset before setting the utilization | |
1197 | * update hook and make the caller skip the sample then. | |
1198 | */ | |
1199 | return !!cpu->last_sample_time; | |
93f0822d DB |
1200 | } |
1201 | ||
8fa520af PL |
1202 | static inline int32_t get_avg_frequency(struct cpudata *cpu) |
1203 | { | |
6d45b719 RW |
1204 | return fp_toint(mul_fp(cpu->sample.core_pct_busy, |
1205 | int_tofp(cpu->pstate.max_pstate_physical * | |
1206 | cpu->pstate.scaling / 100))); | |
8fa520af PL |
1207 | } |
1208 | ||
bdcaa23f PL |
1209 | static inline int32_t get_avg_pstate(struct cpudata *cpu) |
1210 | { | |
1211 | return div64_u64(cpu->pstate.max_pstate_physical * cpu->sample.aperf, | |
1212 | cpu->sample.mperf); | |
1213 | } | |
1214 | ||
e70eed2b PL |
1215 | static inline int32_t get_target_pstate_use_cpu_load(struct cpudata *cpu) |
1216 | { | |
1217 | struct sample *sample = &cpu->sample; | |
63d1d656 PL |
1218 | u64 cummulative_iowait, delta_iowait_us; |
1219 | u64 delta_iowait_mperf; | |
1220 | u64 mperf, now; | |
e70eed2b PL |
1221 | int32_t cpu_load; |
1222 | ||
63d1d656 PL |
1223 | cummulative_iowait = get_cpu_iowait_time_us(cpu->cpu, &now); |
1224 | ||
1225 | /* | |
1226 | * Convert iowait time into number of IO cycles spent at max_freq. | |
1227 | * IO is considered as busy only for the cpu_load algorithm. For | |
1228 | * performance this is not needed since we always try to reach the | |
1229 | * maximum P-State, so we are already boosting the IOs. | |
1230 | */ | |
1231 | delta_iowait_us = cummulative_iowait - cpu->prev_cummulative_iowait; | |
1232 | delta_iowait_mperf = div64_u64(delta_iowait_us * cpu->pstate.scaling * | |
1233 | cpu->pstate.max_pstate, MSEC_PER_SEC); | |
1234 | ||
1235 | mperf = cpu->sample.mperf + delta_iowait_mperf; | |
1236 | cpu->prev_cummulative_iowait = cummulative_iowait; | |
1237 | ||
e70eed2b PL |
1238 | /* |
1239 | * The load can be estimated as the ratio of the mperf counter | |
1240 | * running at a constant frequency during active periods | |
1241 | * (C0) and the time stamp counter running at the same frequency | |
1242 | * also during C-states. | |
1243 | */ | |
63d1d656 | 1244 | cpu_load = div64_u64(int_tofp(100) * mperf, sample->tsc); |
e70eed2b PL |
1245 | cpu->sample.busy_scaled = cpu_load; |
1246 | ||
bdcaa23f | 1247 | return get_avg_pstate(cpu) - pid_calc(&cpu->pid, cpu_load); |
e70eed2b PL |
1248 | } |
1249 | ||
157386b6 | 1250 | static inline int32_t get_target_pstate_use_performance(struct cpudata *cpu) |
93f0822d | 1251 | { |
c4ee841f | 1252 | int32_t core_busy, max_pstate, current_pstate, sample_ratio; |
a4675fbc | 1253 | u64 duration_ns; |
93f0822d | 1254 | |
e0d4c8f8 KCA |
1255 | /* |
1256 | * core_busy is the ratio of actual performance to max | |
1257 | * max_pstate is the max non turbo pstate available | |
1258 | * current_pstate was the pstate that was requested during | |
1259 | * the last sample period. | |
1260 | * | |
1261 | * We normalize core_busy, which was our actual percent | |
1262 | * performance to what we requested during the last sample | |
1263 | * period. The result will be a percentage of busy at a | |
1264 | * specified pstate. | |
1265 | */ | |
d37e2b76 | 1266 | core_busy = cpu->sample.core_pct_busy; |
22590efb RW |
1267 | max_pstate = cpu->pstate.max_pstate_physical; |
1268 | current_pstate = cpu->pstate.current_pstate; | |
e66c1768 | 1269 | core_busy = mul_fp(core_busy, div_fp(max_pstate, current_pstate)); |
c4ee841f | 1270 | |
e0d4c8f8 | 1271 | /* |
a4675fbc RW |
1272 | * Since our utilization update callback will not run unless we are |
1273 | * in C0, check if the actual elapsed time is significantly greater (3x) | |
1274 | * than our sample interval. If it is, then we were idle for a long | |
1275 | * enough period of time to adjust our busyness. | |
e0d4c8f8 | 1276 | */ |
a4675fbc | 1277 | duration_ns = cpu->sample.time - cpu->last_sample_time; |
febce40f | 1278 | if ((s64)duration_ns > pid_params.sample_rate_ns * 3) { |
22590efb | 1279 | sample_ratio = div_fp(pid_params.sample_rate_ns, duration_ns); |
c4ee841f | 1280 | core_busy = mul_fp(core_busy, sample_ratio); |
ffb81056 RW |
1281 | } else { |
1282 | sample_ratio = div_fp(100 * cpu->sample.mperf, cpu->sample.tsc); | |
1283 | if (sample_ratio < int_tofp(1)) | |
1284 | core_busy = 0; | |
c4ee841f DB |
1285 | } |
1286 | ||
157386b6 PL |
1287 | cpu->sample.busy_scaled = core_busy; |
1288 | return cpu->pstate.current_pstate - pid_calc(&cpu->pid, core_busy); | |
93f0822d DB |
1289 | } |
1290 | ||
fdfdb2b1 RW |
1291 | static inline void intel_pstate_update_pstate(struct cpudata *cpu, int pstate) |
1292 | { | |
1293 | int max_perf, min_perf; | |
1294 | ||
1295 | update_turbo_state(); | |
1296 | ||
1297 | intel_pstate_get_min_max(cpu, &min_perf, &max_perf); | |
1298 | pstate = clamp_t(int, pstate, min_perf, max_perf); | |
1299 | if (pstate == cpu->pstate.current_pstate) | |
1300 | return; | |
1301 | ||
1302 | intel_pstate_record_pstate(cpu, pstate); | |
1303 | wrmsrl(MSR_IA32_PERF_CTL, pstate_funcs.get_val(cpu, pstate)); | |
1304 | } | |
1305 | ||
93f0822d DB |
1306 | static inline void intel_pstate_adjust_busy_pstate(struct cpudata *cpu) |
1307 | { | |
157386b6 | 1308 | int from, target_pstate; |
4055fad3 DS |
1309 | struct sample *sample; |
1310 | ||
1311 | from = cpu->pstate.current_pstate; | |
93f0822d | 1312 | |
157386b6 | 1313 | target_pstate = pstate_funcs.get_target_pstate(cpu); |
93f0822d | 1314 | |
fdfdb2b1 | 1315 | intel_pstate_update_pstate(cpu, target_pstate); |
4055fad3 DS |
1316 | |
1317 | sample = &cpu->sample; | |
1318 | trace_pstate_sample(fp_toint(sample->core_pct_busy), | |
157386b6 | 1319 | fp_toint(sample->busy_scaled), |
4055fad3 DS |
1320 | from, |
1321 | cpu->pstate.current_pstate, | |
1322 | sample->mperf, | |
1323 | sample->aperf, | |
1324 | sample->tsc, | |
8fa520af | 1325 | get_avg_frequency(cpu)); |
93f0822d DB |
1326 | } |
1327 | ||
a4675fbc RW |
1328 | static void intel_pstate_update_util(struct update_util_data *data, u64 time, |
1329 | unsigned long util, unsigned long max) | |
93f0822d | 1330 | { |
a4675fbc RW |
1331 | struct cpudata *cpu = container_of(data, struct cpudata, update_util); |
1332 | u64 delta_ns = time - cpu->sample.time; | |
b69880f9 | 1333 | |
a4675fbc | 1334 | if ((s64)delta_ns >= pid_params.sample_rate_ns) { |
4fec7ad5 RW |
1335 | bool sample_taken = intel_pstate_sample(cpu, time); |
1336 | ||
6d45b719 RW |
1337 | if (sample_taken) { |
1338 | intel_pstate_calc_busy(cpu); | |
1339 | if (!hwp_active) | |
1340 | intel_pstate_adjust_busy_pstate(cpu); | |
1341 | } | |
a4675fbc | 1342 | } |
93f0822d DB |
1343 | } |
1344 | ||
1345 | #define ICPU(model, policy) \ | |
6cbd7ee1 DB |
1346 | { X86_VENDOR_INTEL, 6, model, X86_FEATURE_APERFMPERF,\ |
1347 | (unsigned long)&policy } | |
93f0822d DB |
1348 | |
1349 | static const struct x86_cpu_id intel_pstate_cpu_ids[] = { | |
016c8150 DB |
1350 | ICPU(0x2a, core_params), |
1351 | ICPU(0x2d, core_params), | |
1421df63 | 1352 | ICPU(0x37, silvermont_params), |
016c8150 DB |
1353 | ICPU(0x3a, core_params), |
1354 | ICPU(0x3c, core_params), | |
c7e241df | 1355 | ICPU(0x3d, core_params), |
016c8150 DB |
1356 | ICPU(0x3e, core_params), |
1357 | ICPU(0x3f, core_params), | |
1358 | ICPU(0x45, core_params), | |
1359 | ICPU(0x46, core_params), | |
43f8a966 | 1360 | ICPU(0x47, core_params), |
1421df63 | 1361 | ICPU(0x4c, airmont_params), |
7ab0256e | 1362 | ICPU(0x4e, core_params), |
c7e241df | 1363 | ICPU(0x4f, core_params), |
1c939123 | 1364 | ICPU(0x5e, core_params), |
c7e241df | 1365 | ICPU(0x56, core_params), |
b34ef932 | 1366 | ICPU(0x57, knl_params), |
93f0822d DB |
1367 | {} |
1368 | }; | |
1369 | MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids); | |
1370 | ||
2f86dc4c DB |
1371 | static const struct x86_cpu_id intel_pstate_cpu_oob_ids[] = { |
1372 | ICPU(0x56, core_params), | |
1373 | {} | |
1374 | }; | |
1375 | ||
93f0822d DB |
1376 | static int intel_pstate_init_cpu(unsigned int cpunum) |
1377 | { | |
93f0822d DB |
1378 | struct cpudata *cpu; |
1379 | ||
c0348717 DB |
1380 | if (!all_cpu_data[cpunum]) |
1381 | all_cpu_data[cpunum] = kzalloc(sizeof(struct cpudata), | |
1382 | GFP_KERNEL); | |
93f0822d DB |
1383 | if (!all_cpu_data[cpunum]) |
1384 | return -ENOMEM; | |
1385 | ||
1386 | cpu = all_cpu_data[cpunum]; | |
1387 | ||
93f0822d | 1388 | cpu->cpu = cpunum; |
ba88d433 | 1389 | |
a4675fbc | 1390 | if (hwp_active) { |
ba88d433 | 1391 | intel_pstate_hwp_enable(cpu); |
a4675fbc RW |
1392 | pid_params.sample_rate_ms = 50; |
1393 | pid_params.sample_rate_ns = 50 * NSEC_PER_MSEC; | |
1394 | } | |
ba88d433 | 1395 | |
179e8471 | 1396 | intel_pstate_get_cpu_pstates(cpu); |
016c8150 | 1397 | |
93f0822d | 1398 | intel_pstate_busy_pid_reset(cpu); |
93f0822d | 1399 | |
4836df17 | 1400 | pr_debug("controlling: cpu %d\n", cpunum); |
93f0822d DB |
1401 | |
1402 | return 0; | |
1403 | } | |
1404 | ||
1405 | static unsigned int intel_pstate_get(unsigned int cpu_num) | |
1406 | { | |
f96fd0c8 | 1407 | struct cpudata *cpu = all_cpu_data[cpu_num]; |
93f0822d | 1408 | |
f96fd0c8 | 1409 | return cpu ? get_avg_frequency(cpu) : 0; |
93f0822d DB |
1410 | } |
1411 | ||
febce40f | 1412 | static void intel_pstate_set_update_util_hook(unsigned int cpu_num) |
bb6ab52f | 1413 | { |
febce40f RW |
1414 | struct cpudata *cpu = all_cpu_data[cpu_num]; |
1415 | ||
1416 | /* Prevent intel_pstate_update_util() from using stale data. */ | |
1417 | cpu->sample.time = 0; | |
0bed612b RW |
1418 | cpufreq_add_update_util_hook(cpu_num, &cpu->update_util, |
1419 | intel_pstate_update_util); | |
bb6ab52f RW |
1420 | } |
1421 | ||
1422 | static void intel_pstate_clear_update_util_hook(unsigned int cpu) | |
1423 | { | |
0bed612b | 1424 | cpufreq_remove_update_util_hook(cpu); |
bb6ab52f RW |
1425 | synchronize_sched(); |
1426 | } | |
1427 | ||
30a39153 SP |
1428 | static void intel_pstate_set_performance_limits(struct perf_limits *limits) |
1429 | { | |
1430 | limits->no_turbo = 0; | |
1431 | limits->turbo_disabled = 0; | |
1432 | limits->max_perf_pct = 100; | |
1433 | limits->max_perf = int_tofp(1); | |
1434 | limits->min_perf_pct = 100; | |
1435 | limits->min_perf = int_tofp(1); | |
1436 | limits->max_policy_pct = 100; | |
1437 | limits->max_sysfs_pct = 100; | |
1438 | limits->min_policy_pct = 0; | |
1439 | limits->min_sysfs_pct = 0; | |
1440 | } | |
1441 | ||
93f0822d DB |
1442 | static int intel_pstate_set_policy(struct cpufreq_policy *policy) |
1443 | { | |
3be9200d SP |
1444 | struct cpudata *cpu; |
1445 | ||
d3929b83 DB |
1446 | if (!policy->cpuinfo.max_freq) |
1447 | return -ENODEV; | |
1448 | ||
bb6ab52f RW |
1449 | intel_pstate_clear_update_util_hook(policy->cpu); |
1450 | ||
3be9200d SP |
1451 | cpu = all_cpu_data[0]; |
1452 | if (cpu->pstate.max_pstate_physical > cpu->pstate.max_pstate) { | |
1453 | if (policy->max < policy->cpuinfo.max_freq && | |
1454 | policy->max > cpu->pstate.max_pstate * cpu->pstate.scaling) { | |
1455 | pr_debug("policy->max > max non turbo frequency\n"); | |
1456 | policy->max = policy->cpuinfo.max_freq; | |
1457 | } | |
1458 | } | |
1459 | ||
30a39153 | 1460 | if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) { |
51443fbf | 1461 | limits = &performance_limits; |
30a39153 | 1462 | if (policy->max >= policy->cpuinfo.max_freq) { |
4836df17 | 1463 | pr_debug("set performance\n"); |
30a39153 SP |
1464 | intel_pstate_set_performance_limits(limits); |
1465 | goto out; | |
1466 | } | |
1467 | } else { | |
4836df17 | 1468 | pr_debug("set powersave\n"); |
30a39153 | 1469 | limits = &powersave_limits; |
93f0822d | 1470 | } |
2f86dc4c | 1471 | |
51443fbf PB |
1472 | limits->min_policy_pct = (policy->min * 100) / policy->cpuinfo.max_freq; |
1473 | limits->min_policy_pct = clamp_t(int, limits->min_policy_pct, 0 , 100); | |
8478f539 PB |
1474 | limits->max_policy_pct = DIV_ROUND_UP(policy->max * 100, |
1475 | policy->cpuinfo.max_freq); | |
51443fbf | 1476 | limits->max_policy_pct = clamp_t(int, limits->max_policy_pct, 0 , 100); |
43717aad CY |
1477 | |
1478 | /* Normalize user input to [min_policy_pct, max_policy_pct] */ | |
51443fbf PB |
1479 | limits->min_perf_pct = max(limits->min_policy_pct, |
1480 | limits->min_sysfs_pct); | |
1481 | limits->min_perf_pct = min(limits->max_policy_pct, | |
1482 | limits->min_perf_pct); | |
1483 | limits->max_perf_pct = min(limits->max_policy_pct, | |
1484 | limits->max_sysfs_pct); | |
1485 | limits->max_perf_pct = max(limits->min_policy_pct, | |
1486 | limits->max_perf_pct); | |
88b7b7c0 | 1487 | limits->max_perf = round_up(limits->max_perf, FRAC_BITS); |
43717aad CY |
1488 | |
1489 | /* Make sure min_perf_pct <= max_perf_pct */ | |
51443fbf | 1490 | limits->min_perf_pct = min(limits->max_perf_pct, limits->min_perf_pct); |
43717aad | 1491 | |
22590efb RW |
1492 | limits->min_perf = div_fp(limits->min_perf_pct, 100); |
1493 | limits->max_perf = div_fp(limits->max_perf_pct, 100); | |
93f0822d | 1494 | |
bb6ab52f RW |
1495 | out: |
1496 | intel_pstate_set_update_util_hook(policy->cpu); | |
1497 | ||
ba41e1bc | 1498 | intel_pstate_hwp_set_policy(policy); |
2f86dc4c | 1499 | |
93f0822d DB |
1500 | return 0; |
1501 | } | |
1502 | ||
1503 | static int intel_pstate_verify_policy(struct cpufreq_policy *policy) | |
1504 | { | |
be49e346 | 1505 | cpufreq_verify_within_cpu_limits(policy); |
93f0822d | 1506 | |
285cb990 | 1507 | if (policy->policy != CPUFREQ_POLICY_POWERSAVE && |
c410833a | 1508 | policy->policy != CPUFREQ_POLICY_PERFORMANCE) |
93f0822d DB |
1509 | return -EINVAL; |
1510 | ||
1511 | return 0; | |
1512 | } | |
1513 | ||
bb18008f | 1514 | static void intel_pstate_stop_cpu(struct cpufreq_policy *policy) |
93f0822d | 1515 | { |
bb18008f DB |
1516 | int cpu_num = policy->cpu; |
1517 | struct cpudata *cpu = all_cpu_data[cpu_num]; | |
93f0822d | 1518 | |
4836df17 | 1519 | pr_debug("CPU %d exiting\n", cpu_num); |
bb18008f | 1520 | |
bb6ab52f | 1521 | intel_pstate_clear_update_util_hook(cpu_num); |
a4675fbc | 1522 | |
2f86dc4c DB |
1523 | if (hwp_active) |
1524 | return; | |
1525 | ||
fdfdb2b1 | 1526 | intel_pstate_set_min_pstate(cpu); |
93f0822d DB |
1527 | } |
1528 | ||
2760984f | 1529 | static int intel_pstate_cpu_init(struct cpufreq_policy *policy) |
93f0822d | 1530 | { |
93f0822d | 1531 | struct cpudata *cpu; |
52e0a509 | 1532 | int rc; |
93f0822d DB |
1533 | |
1534 | rc = intel_pstate_init_cpu(policy->cpu); | |
1535 | if (rc) | |
1536 | return rc; | |
1537 | ||
1538 | cpu = all_cpu_data[policy->cpu]; | |
1539 | ||
51443fbf | 1540 | if (limits->min_perf_pct == 100 && limits->max_perf_pct == 100) |
93f0822d DB |
1541 | policy->policy = CPUFREQ_POLICY_PERFORMANCE; |
1542 | else | |
1543 | policy->policy = CPUFREQ_POLICY_POWERSAVE; | |
1544 | ||
b27580b0 DB |
1545 | policy->min = cpu->pstate.min_pstate * cpu->pstate.scaling; |
1546 | policy->max = cpu->pstate.turbo_pstate * cpu->pstate.scaling; | |
93f0822d DB |
1547 | |
1548 | /* cpuinfo and default policy values */ | |
b27580b0 DB |
1549 | policy->cpuinfo.min_freq = cpu->pstate.min_pstate * cpu->pstate.scaling; |
1550 | policy->cpuinfo.max_freq = | |
1551 | cpu->pstate.turbo_pstate * cpu->pstate.scaling; | |
9522a2ff | 1552 | intel_pstate_init_acpi_perf_limits(policy); |
93f0822d DB |
1553 | policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL; |
1554 | cpumask_set_cpu(policy->cpu, policy->cpus); | |
1555 | ||
1556 | return 0; | |
1557 | } | |
1558 | ||
9522a2ff SP |
1559 | static int intel_pstate_cpu_exit(struct cpufreq_policy *policy) |
1560 | { | |
1561 | intel_pstate_exit_perf_limits(policy); | |
1562 | ||
1563 | return 0; | |
1564 | } | |
1565 | ||
93f0822d DB |
1566 | static struct cpufreq_driver intel_pstate_driver = { |
1567 | .flags = CPUFREQ_CONST_LOOPS, | |
1568 | .verify = intel_pstate_verify_policy, | |
1569 | .setpolicy = intel_pstate_set_policy, | |
ba41e1bc | 1570 | .resume = intel_pstate_hwp_set_policy, |
93f0822d DB |
1571 | .get = intel_pstate_get, |
1572 | .init = intel_pstate_cpu_init, | |
9522a2ff | 1573 | .exit = intel_pstate_cpu_exit, |
bb18008f | 1574 | .stop_cpu = intel_pstate_stop_cpu, |
93f0822d | 1575 | .name = "intel_pstate", |
93f0822d DB |
1576 | }; |
1577 | ||
6be26498 | 1578 | static int __initdata no_load; |
2f86dc4c | 1579 | static int __initdata no_hwp; |
d64c3b0b | 1580 | static int __initdata hwp_only; |
aa4ea34d | 1581 | static unsigned int force_load; |
6be26498 | 1582 | |
b563b4e3 DB |
1583 | static int intel_pstate_msrs_not_valid(void) |
1584 | { | |
016c8150 | 1585 | if (!pstate_funcs.get_max() || |
c410833a SK |
1586 | !pstate_funcs.get_min() || |
1587 | !pstate_funcs.get_turbo()) | |
b563b4e3 DB |
1588 | return -ENODEV; |
1589 | ||
b563b4e3 DB |
1590 | return 0; |
1591 | } | |
016c8150 | 1592 | |
e0a261a2 | 1593 | static void copy_pid_params(struct pstate_adjust_policy *policy) |
016c8150 DB |
1594 | { |
1595 | pid_params.sample_rate_ms = policy->sample_rate_ms; | |
a4675fbc | 1596 | pid_params.sample_rate_ns = pid_params.sample_rate_ms * NSEC_PER_MSEC; |
016c8150 DB |
1597 | pid_params.p_gain_pct = policy->p_gain_pct; |
1598 | pid_params.i_gain_pct = policy->i_gain_pct; | |
1599 | pid_params.d_gain_pct = policy->d_gain_pct; | |
1600 | pid_params.deadband = policy->deadband; | |
1601 | pid_params.setpoint = policy->setpoint; | |
1602 | } | |
1603 | ||
e0a261a2 | 1604 | static void copy_cpu_funcs(struct pstate_funcs *funcs) |
016c8150 DB |
1605 | { |
1606 | pstate_funcs.get_max = funcs->get_max; | |
3bcc6fa9 | 1607 | pstate_funcs.get_max_physical = funcs->get_max_physical; |
016c8150 DB |
1608 | pstate_funcs.get_min = funcs->get_min; |
1609 | pstate_funcs.get_turbo = funcs->get_turbo; | |
b27580b0 | 1610 | pstate_funcs.get_scaling = funcs->get_scaling; |
fdfdb2b1 | 1611 | pstate_funcs.get_val = funcs->get_val; |
007bea09 | 1612 | pstate_funcs.get_vid = funcs->get_vid; |
157386b6 PL |
1613 | pstate_funcs.get_target_pstate = funcs->get_target_pstate; |
1614 | ||
016c8150 DB |
1615 | } |
1616 | ||
9522a2ff | 1617 | #ifdef CONFIG_ACPI |
fbbcdc07 AH |
1618 | |
1619 | static bool intel_pstate_no_acpi_pss(void) | |
1620 | { | |
1621 | int i; | |
1622 | ||
1623 | for_each_possible_cpu(i) { | |
1624 | acpi_status status; | |
1625 | union acpi_object *pss; | |
1626 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
1627 | struct acpi_processor *pr = per_cpu(processors, i); | |
1628 | ||
1629 | if (!pr) | |
1630 | continue; | |
1631 | ||
1632 | status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); | |
1633 | if (ACPI_FAILURE(status)) | |
1634 | continue; | |
1635 | ||
1636 | pss = buffer.pointer; | |
1637 | if (pss && pss->type == ACPI_TYPE_PACKAGE) { | |
1638 | kfree(pss); | |
1639 | return false; | |
1640 | } | |
1641 | ||
1642 | kfree(pss); | |
1643 | } | |
1644 | ||
1645 | return true; | |
1646 | } | |
1647 | ||
966916ea | 1648 | static bool intel_pstate_has_acpi_ppc(void) |
1649 | { | |
1650 | int i; | |
1651 | ||
1652 | for_each_possible_cpu(i) { | |
1653 | struct acpi_processor *pr = per_cpu(processors, i); | |
1654 | ||
1655 | if (!pr) | |
1656 | continue; | |
1657 | if (acpi_has_method(pr->handle, "_PPC")) | |
1658 | return true; | |
1659 | } | |
1660 | return false; | |
1661 | } | |
1662 | ||
1663 | enum { | |
1664 | PSS, | |
1665 | PPC, | |
1666 | }; | |
1667 | ||
fbbcdc07 AH |
1668 | struct hw_vendor_info { |
1669 | u16 valid; | |
1670 | char oem_id[ACPI_OEM_ID_SIZE]; | |
1671 | char oem_table_id[ACPI_OEM_TABLE_ID_SIZE]; | |
966916ea | 1672 | int oem_pwr_table; |
fbbcdc07 AH |
1673 | }; |
1674 | ||
1675 | /* Hardware vendor-specific info that has its own power management modes */ | |
1676 | static struct hw_vendor_info vendor_info[] = { | |
966916ea | 1677 | {1, "HP ", "ProLiant", PSS}, |
1678 | {1, "ORACLE", "X4-2 ", PPC}, | |
1679 | {1, "ORACLE", "X4-2L ", PPC}, | |
1680 | {1, "ORACLE", "X4-2B ", PPC}, | |
1681 | {1, "ORACLE", "X3-2 ", PPC}, | |
1682 | {1, "ORACLE", "X3-2L ", PPC}, | |
1683 | {1, "ORACLE", "X3-2B ", PPC}, | |
1684 | {1, "ORACLE", "X4470M2 ", PPC}, | |
1685 | {1, "ORACLE", "X4270M3 ", PPC}, | |
1686 | {1, "ORACLE", "X4270M2 ", PPC}, | |
1687 | {1, "ORACLE", "X4170M2 ", PPC}, | |
5aecc3c8 EZ |
1688 | {1, "ORACLE", "X4170 M3", PPC}, |
1689 | {1, "ORACLE", "X4275 M3", PPC}, | |
1690 | {1, "ORACLE", "X6-2 ", PPC}, | |
1691 | {1, "ORACLE", "Sudbury ", PPC}, | |
fbbcdc07 AH |
1692 | {0, "", ""}, |
1693 | }; | |
1694 | ||
1695 | static bool intel_pstate_platform_pwr_mgmt_exists(void) | |
1696 | { | |
1697 | struct acpi_table_header hdr; | |
1698 | struct hw_vendor_info *v_info; | |
2f86dc4c DB |
1699 | const struct x86_cpu_id *id; |
1700 | u64 misc_pwr; | |
1701 | ||
1702 | id = x86_match_cpu(intel_pstate_cpu_oob_ids); | |
1703 | if (id) { | |
1704 | rdmsrl(MSR_MISC_PWR_MGMT, misc_pwr); | |
1705 | if ( misc_pwr & (1 << 8)) | |
1706 | return true; | |
1707 | } | |
fbbcdc07 | 1708 | |
c410833a SK |
1709 | if (acpi_disabled || |
1710 | ACPI_FAILURE(acpi_get_table_header(ACPI_SIG_FADT, 0, &hdr))) | |
fbbcdc07 AH |
1711 | return false; |
1712 | ||
1713 | for (v_info = vendor_info; v_info->valid; v_info++) { | |
c410833a | 1714 | if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE) && |
966916ea | 1715 | !strncmp(hdr.oem_table_id, v_info->oem_table_id, |
1716 | ACPI_OEM_TABLE_ID_SIZE)) | |
1717 | switch (v_info->oem_pwr_table) { | |
1718 | case PSS: | |
1719 | return intel_pstate_no_acpi_pss(); | |
1720 | case PPC: | |
aa4ea34d EZ |
1721 | return intel_pstate_has_acpi_ppc() && |
1722 | (!force_load); | |
966916ea | 1723 | } |
fbbcdc07 AH |
1724 | } |
1725 | ||
1726 | return false; | |
1727 | } | |
1728 | #else /* CONFIG_ACPI not enabled */ | |
1729 | static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; } | |
966916ea | 1730 | static inline bool intel_pstate_has_acpi_ppc(void) { return false; } |
fbbcdc07 AH |
1731 | #endif /* CONFIG_ACPI */ |
1732 | ||
7791e4aa SP |
1733 | static const struct x86_cpu_id hwp_support_ids[] __initconst = { |
1734 | { X86_VENDOR_INTEL, 6, X86_MODEL_ANY, X86_FEATURE_HWP }, | |
1735 | {} | |
1736 | }; | |
1737 | ||
93f0822d DB |
1738 | static int __init intel_pstate_init(void) |
1739 | { | |
907cc908 | 1740 | int cpu, rc = 0; |
93f0822d | 1741 | const struct x86_cpu_id *id; |
64df1fdf | 1742 | struct cpu_defaults *cpu_def; |
93f0822d | 1743 | |
6be26498 DB |
1744 | if (no_load) |
1745 | return -ENODEV; | |
1746 | ||
7791e4aa SP |
1747 | if (x86_match_cpu(hwp_support_ids) && !no_hwp) { |
1748 | copy_cpu_funcs(&core_params.funcs); | |
1749 | hwp_active++; | |
1750 | goto hwp_cpu_matched; | |
1751 | } | |
1752 | ||
93f0822d DB |
1753 | id = x86_match_cpu(intel_pstate_cpu_ids); |
1754 | if (!id) | |
1755 | return -ENODEV; | |
1756 | ||
64df1fdf | 1757 | cpu_def = (struct cpu_defaults *)id->driver_data; |
016c8150 | 1758 | |
64df1fdf BP |
1759 | copy_pid_params(&cpu_def->pid_policy); |
1760 | copy_cpu_funcs(&cpu_def->funcs); | |
016c8150 | 1761 | |
b563b4e3 DB |
1762 | if (intel_pstate_msrs_not_valid()) |
1763 | return -ENODEV; | |
1764 | ||
7791e4aa SP |
1765 | hwp_cpu_matched: |
1766 | /* | |
1767 | * The Intel pstate driver will be ignored if the platform | |
1768 | * firmware has its own power management modes. | |
1769 | */ | |
1770 | if (intel_pstate_platform_pwr_mgmt_exists()) | |
1771 | return -ENODEV; | |
1772 | ||
4836df17 | 1773 | pr_info("Intel P-state driver initializing\n"); |
93f0822d | 1774 | |
b57ffac5 | 1775 | all_cpu_data = vzalloc(sizeof(void *) * num_possible_cpus()); |
93f0822d DB |
1776 | if (!all_cpu_data) |
1777 | return -ENOMEM; | |
93f0822d | 1778 | |
d64c3b0b KCA |
1779 | if (!hwp_active && hwp_only) |
1780 | goto out; | |
1781 | ||
93f0822d DB |
1782 | rc = cpufreq_register_driver(&intel_pstate_driver); |
1783 | if (rc) | |
1784 | goto out; | |
1785 | ||
1786 | intel_pstate_debug_expose_params(); | |
1787 | intel_pstate_sysfs_expose_params(); | |
b69880f9 | 1788 | |
7791e4aa | 1789 | if (hwp_active) |
4836df17 | 1790 | pr_info("HWP enabled\n"); |
7791e4aa | 1791 | |
93f0822d DB |
1792 | return rc; |
1793 | out: | |
907cc908 DB |
1794 | get_online_cpus(); |
1795 | for_each_online_cpu(cpu) { | |
1796 | if (all_cpu_data[cpu]) { | |
bb6ab52f | 1797 | intel_pstate_clear_update_util_hook(cpu); |
907cc908 DB |
1798 | kfree(all_cpu_data[cpu]); |
1799 | } | |
1800 | } | |
1801 | ||
1802 | put_online_cpus(); | |
1803 | vfree(all_cpu_data); | |
93f0822d DB |
1804 | return -ENODEV; |
1805 | } | |
1806 | device_initcall(intel_pstate_init); | |
1807 | ||
6be26498 DB |
1808 | static int __init intel_pstate_setup(char *str) |
1809 | { | |
1810 | if (!str) | |
1811 | return -EINVAL; | |
1812 | ||
1813 | if (!strcmp(str, "disable")) | |
1814 | no_load = 1; | |
539342f6 | 1815 | if (!strcmp(str, "no_hwp")) { |
4836df17 | 1816 | pr_info("HWP disabled\n"); |
2f86dc4c | 1817 | no_hwp = 1; |
539342f6 | 1818 | } |
aa4ea34d EZ |
1819 | if (!strcmp(str, "force")) |
1820 | force_load = 1; | |
d64c3b0b KCA |
1821 | if (!strcmp(str, "hwp_only")) |
1822 | hwp_only = 1; | |
9522a2ff SP |
1823 | |
1824 | #ifdef CONFIG_ACPI | |
1825 | if (!strcmp(str, "support_acpi_ppc")) | |
1826 | acpi_ppc = true; | |
1827 | #endif | |
1828 | ||
6be26498 DB |
1829 | return 0; |
1830 | } | |
1831 | early_param("intel_pstate", intel_pstate_setup); | |
1832 | ||
93f0822d DB |
1833 | MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@intel.com>"); |
1834 | MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors"); | |
1835 | MODULE_LICENSE("GPL"); |