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Commit | Line | Data |
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93f0822d | 1 | /* |
d1b68485 | 2 | * intel_pstate.c: Native P state management for Intel processors |
93f0822d DB |
3 | * |
4 | * (C) Copyright 2012 Intel Corporation | |
5 | * Author: Dirk Brandewie <dirk.j.brandewie@intel.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; version 2 | |
10 | * of the License. | |
11 | */ | |
12 | ||
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> | |
55687da1 | 22 | #include <linux/sched/cpufreq.h> |
93f0822d DB |
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> |
5b20c944 | 38 | #include <asm/intel-family.h> |
93f0822d | 39 | |
eabd22c6 RW |
40 | #define INTEL_PSTATE_DEFAULT_SAMPLING_INTERVAL (10 * NSEC_PER_MSEC) |
41 | #define INTEL_PSTATE_HWP_SAMPLING_INTERVAL (50 * NSEC_PER_MSEC) | |
42 | ||
001c76f0 RW |
43 | #define INTEL_CPUFREQ_TRANSITION_LATENCY 20000 |
44 | ||
9522a2ff SP |
45 | #ifdef CONFIG_ACPI |
46 | #include <acpi/processor.h> | |
17669006 | 47 | #include <acpi/cppc_acpi.h> |
9522a2ff SP |
48 | #endif |
49 | ||
f0fe3cd7 | 50 | #define FRAC_BITS 8 |
93f0822d DB |
51 | #define int_tofp(X) ((int64_t)(X) << FRAC_BITS) |
52 | #define fp_toint(X) ((X) >> FRAC_BITS) | |
f0fe3cd7 | 53 | |
a1c9787d RW |
54 | #define EXT_BITS 6 |
55 | #define EXT_FRAC_BITS (EXT_BITS + FRAC_BITS) | |
d5dd33d9 SP |
56 | #define fp_ext_toint(X) ((X) >> EXT_FRAC_BITS) |
57 | #define int_ext_tofp(X) ((int64_t)(X) << EXT_FRAC_BITS) | |
a1c9787d | 58 | |
93f0822d DB |
59 | static inline int32_t mul_fp(int32_t x, int32_t y) |
60 | { | |
61 | return ((int64_t)x * (int64_t)y) >> FRAC_BITS; | |
62 | } | |
63 | ||
7180dddf | 64 | static inline int32_t div_fp(s64 x, s64 y) |
93f0822d | 65 | { |
7180dddf | 66 | return div64_s64((int64_t)x << FRAC_BITS, y); |
93f0822d DB |
67 | } |
68 | ||
d022a65e DB |
69 | static inline int ceiling_fp(int32_t x) |
70 | { | |
71 | int mask, ret; | |
72 | ||
73 | ret = fp_toint(x); | |
74 | mask = (1 << FRAC_BITS) - 1; | |
75 | if (x & mask) | |
76 | ret += 1; | |
77 | return ret; | |
78 | } | |
79 | ||
ff35f02e RW |
80 | static inline int32_t percent_fp(int percent) |
81 | { | |
82 | return div_fp(percent, 100); | |
83 | } | |
84 | ||
a1c9787d RW |
85 | static inline u64 mul_ext_fp(u64 x, u64 y) |
86 | { | |
87 | return (x * y) >> EXT_FRAC_BITS; | |
88 | } | |
89 | ||
90 | static inline u64 div_ext_fp(u64 x, u64 y) | |
91 | { | |
92 | return div64_u64(x << EXT_FRAC_BITS, y); | |
93 | } | |
94 | ||
e4c204ce RW |
95 | static inline int32_t percent_ext_fp(int percent) |
96 | { | |
97 | return div_ext_fp(percent, 100); | |
98 | } | |
99 | ||
13ad7701 SP |
100 | /** |
101 | * struct sample - Store performance sample | |
a1c9787d | 102 | * @core_avg_perf: Ratio of APERF/MPERF which is the actual average |
13ad7701 SP |
103 | * performance during last sample period |
104 | * @busy_scaled: Scaled busy value which is used to calculate next | |
a1c9787d | 105 | * P state. This can be different than core_avg_perf |
13ad7701 SP |
106 | * to account for cpu idle period |
107 | * @aperf: Difference of actual performance frequency clock count | |
108 | * read from APERF MSR between last and current sample | |
109 | * @mperf: Difference of maximum performance frequency clock count | |
110 | * read from MPERF MSR between last and current sample | |
111 | * @tsc: Difference of time stamp counter between last and | |
112 | * current sample | |
13ad7701 SP |
113 | * @time: Current time from scheduler |
114 | * | |
115 | * This structure is used in the cpudata structure to store performance sample | |
116 | * data for choosing next P State. | |
117 | */ | |
93f0822d | 118 | struct sample { |
a1c9787d | 119 | int32_t core_avg_perf; |
157386b6 | 120 | int32_t busy_scaled; |
93f0822d DB |
121 | u64 aperf; |
122 | u64 mperf; | |
4055fad3 | 123 | u64 tsc; |
a4675fbc | 124 | u64 time; |
93f0822d DB |
125 | }; |
126 | ||
13ad7701 SP |
127 | /** |
128 | * struct pstate_data - Store P state data | |
129 | * @current_pstate: Current requested P state | |
130 | * @min_pstate: Min P state possible for this platform | |
131 | * @max_pstate: Max P state possible for this platform | |
132 | * @max_pstate_physical:This is physical Max P state for a processor | |
133 | * This can be higher than the max_pstate which can | |
134 | * be limited by platform thermal design power limits | |
135 | * @scaling: Scaling factor to convert frequency to cpufreq | |
136 | * frequency units | |
137 | * @turbo_pstate: Max Turbo P state possible for this platform | |
001c76f0 RW |
138 | * @max_freq: @max_pstate frequency in cpufreq units |
139 | * @turbo_freq: @turbo_pstate frequency in cpufreq units | |
13ad7701 SP |
140 | * |
141 | * Stores the per cpu model P state limits and current P state. | |
142 | */ | |
93f0822d DB |
143 | struct pstate_data { |
144 | int current_pstate; | |
145 | int min_pstate; | |
146 | int max_pstate; | |
3bcc6fa9 | 147 | int max_pstate_physical; |
b27580b0 | 148 | int scaling; |
93f0822d | 149 | int turbo_pstate; |
001c76f0 RW |
150 | unsigned int max_freq; |
151 | unsigned int turbo_freq; | |
93f0822d DB |
152 | }; |
153 | ||
13ad7701 SP |
154 | /** |
155 | * struct vid_data - Stores voltage information data | |
156 | * @min: VID data for this platform corresponding to | |
157 | * the lowest P state | |
158 | * @max: VID data corresponding to the highest P State. | |
159 | * @turbo: VID data for turbo P state | |
160 | * @ratio: Ratio of (vid max - vid min) / | |
161 | * (max P state - Min P State) | |
162 | * | |
163 | * Stores the voltage data for DVFS (Dynamic Voltage and Frequency Scaling) | |
164 | * This data is used in Atom platforms, where in addition to target P state, | |
165 | * the voltage data needs to be specified to select next P State. | |
166 | */ | |
007bea09 | 167 | struct vid_data { |
21855ff5 DB |
168 | int min; |
169 | int max; | |
170 | int turbo; | |
007bea09 DB |
171 | int32_t ratio; |
172 | }; | |
173 | ||
13ad7701 SP |
174 | /** |
175 | * struct _pid - Stores PID data | |
176 | * @setpoint: Target set point for busyness or performance | |
177 | * @integral: Storage for accumulated error values | |
178 | * @p_gain: PID proportional gain | |
179 | * @i_gain: PID integral gain | |
180 | * @d_gain: PID derivative gain | |
181 | * @deadband: PID deadband | |
182 | * @last_err: Last error storage for integral part of PID calculation | |
183 | * | |
184 | * Stores PID coefficients and last error for PID controller. | |
185 | */ | |
93f0822d DB |
186 | struct _pid { |
187 | int setpoint; | |
188 | int32_t integral; | |
189 | int32_t p_gain; | |
190 | int32_t i_gain; | |
191 | int32_t d_gain; | |
192 | int deadband; | |
d253d2a5 | 193 | int32_t last_err; |
93f0822d DB |
194 | }; |
195 | ||
c5a2ee7d RW |
196 | /** |
197 | * struct global_params - Global parameters, mostly tunable via sysfs. | |
198 | * @no_turbo: Whether or not to use turbo P-states. | |
199 | * @turbo_disabled: Whethet or not turbo P-states are available at all, | |
200 | * based on the MSR_IA32_MISC_ENABLE value and whether or | |
201 | * not the maximum reported turbo P-state is different from | |
202 | * the maximum reported non-turbo one. | |
203 | * @min_perf_pct: Minimum capacity limit in percent of the maximum turbo | |
204 | * P-state capacity. | |
205 | * @max_perf_pct: Maximum capacity limit in percent of the maximum turbo | |
206 | * P-state capacity. | |
207 | */ | |
208 | struct global_params { | |
209 | bool no_turbo; | |
210 | bool turbo_disabled; | |
211 | int max_perf_pct; | |
212 | int min_perf_pct; | |
eae48f04 SP |
213 | }; |
214 | ||
13ad7701 SP |
215 | /** |
216 | * struct cpudata - Per CPU instance data storage | |
217 | * @cpu: CPU number for this instance data | |
2f1d407a | 218 | * @policy: CPUFreq policy value |
13ad7701 | 219 | * @update_util: CPUFreq utility callback information |
4578ee7e | 220 | * @update_util_set: CPUFreq utility callback is set |
09c448d3 RW |
221 | * @iowait_boost: iowait-related boost fraction |
222 | * @last_update: Time of the last update. | |
13ad7701 SP |
223 | * @pstate: Stores P state limits for this CPU |
224 | * @vid: Stores VID limits for this CPU | |
225 | * @pid: Stores PID parameters for this CPU | |
226 | * @last_sample_time: Last Sample time | |
227 | * @prev_aperf: Last APERF value read from APERF MSR | |
228 | * @prev_mperf: Last MPERF value read from MPERF MSR | |
229 | * @prev_tsc: Last timestamp counter (TSC) value | |
230 | * @prev_cummulative_iowait: IO Wait time difference from last and | |
231 | * current sample | |
232 | * @sample: Storage for storing last Sample data | |
e14cf885 RW |
233 | * @min_perf: Minimum capacity limit as a fraction of the maximum |
234 | * turbo P-state capacity. | |
235 | * @max_perf: Maximum capacity limit as a fraction of the maximum | |
236 | * turbo P-state capacity. | |
9522a2ff SP |
237 | * @acpi_perf_data: Stores ACPI perf information read from _PSS |
238 | * @valid_pss_table: Set to true for valid ACPI _PSS entries found | |
984edbdc SP |
239 | * @epp_powersave: Last saved HWP energy performance preference |
240 | * (EPP) or energy performance bias (EPB), | |
241 | * when policy switched to performance | |
8442885f | 242 | * @epp_policy: Last saved policy used to set EPP/EPB |
984edbdc SP |
243 | * @epp_default: Power on default HWP energy performance |
244 | * preference/bias | |
245 | * @epp_saved: Saved EPP/EPB during system suspend or CPU offline | |
246 | * operation | |
13ad7701 SP |
247 | * |
248 | * This structure stores per CPU instance data for all CPUs. | |
249 | */ | |
93f0822d DB |
250 | struct cpudata { |
251 | int cpu; | |
252 | ||
2f1d407a | 253 | unsigned int policy; |
a4675fbc | 254 | struct update_util_data update_util; |
4578ee7e | 255 | bool update_util_set; |
93f0822d | 256 | |
93f0822d | 257 | struct pstate_data pstate; |
007bea09 | 258 | struct vid_data vid; |
93f0822d | 259 | struct _pid pid; |
93f0822d | 260 | |
09c448d3 | 261 | u64 last_update; |
a4675fbc | 262 | u64 last_sample_time; |
93f0822d DB |
263 | u64 prev_aperf; |
264 | u64 prev_mperf; | |
4055fad3 | 265 | u64 prev_tsc; |
63d1d656 | 266 | u64 prev_cummulative_iowait; |
d37e2b76 | 267 | struct sample sample; |
e14cf885 RW |
268 | int32_t min_perf; |
269 | int32_t max_perf; | |
9522a2ff SP |
270 | #ifdef CONFIG_ACPI |
271 | struct acpi_processor_performance acpi_perf_data; | |
272 | bool valid_pss_table; | |
273 | #endif | |
09c448d3 | 274 | unsigned int iowait_boost; |
984edbdc | 275 | s16 epp_powersave; |
8442885f | 276 | s16 epp_policy; |
984edbdc SP |
277 | s16 epp_default; |
278 | s16 epp_saved; | |
93f0822d DB |
279 | }; |
280 | ||
281 | static struct cpudata **all_cpu_data; | |
13ad7701 SP |
282 | |
283 | /** | |
3954517e | 284 | * struct pstate_adjust_policy - Stores static PID configuration data |
13ad7701 SP |
285 | * @sample_rate_ms: PID calculation sample rate in ms |
286 | * @sample_rate_ns: Sample rate calculation in ns | |
287 | * @deadband: PID deadband | |
288 | * @setpoint: PID Setpoint | |
289 | * @p_gain_pct: PID proportional gain | |
290 | * @i_gain_pct: PID integral gain | |
291 | * @d_gain_pct: PID derivative gain | |
292 | * | |
293 | * Stores per CPU model static PID configuration data. | |
294 | */ | |
93f0822d DB |
295 | struct pstate_adjust_policy { |
296 | int sample_rate_ms; | |
a4675fbc | 297 | s64 sample_rate_ns; |
93f0822d DB |
298 | int deadband; |
299 | int setpoint; | |
300 | int p_gain_pct; | |
301 | int d_gain_pct; | |
302 | int i_gain_pct; | |
303 | }; | |
304 | ||
13ad7701 SP |
305 | /** |
306 | * struct pstate_funcs - Per CPU model specific callbacks | |
307 | * @get_max: Callback to get maximum non turbo effective P state | |
308 | * @get_max_physical: Callback to get maximum non turbo physical P state | |
309 | * @get_min: Callback to get minimum P state | |
310 | * @get_turbo: Callback to get turbo P state | |
311 | * @get_scaling: Callback to get frequency scaling factor | |
312 | * @get_val: Callback to convert P state to actual MSR write value | |
313 | * @get_vid: Callback to get VID data for Atom platforms | |
67dd9bf4 | 314 | * @update_util: Active mode utilization update callback. |
13ad7701 SP |
315 | * |
316 | * Core and Atom CPU models have different way to get P State limits. This | |
317 | * structure is used to store those callbacks. | |
318 | */ | |
016c8150 DB |
319 | struct pstate_funcs { |
320 | int (*get_max)(void); | |
3bcc6fa9 | 321 | int (*get_max_physical)(void); |
016c8150 DB |
322 | int (*get_min)(void); |
323 | int (*get_turbo)(void); | |
b27580b0 | 324 | int (*get_scaling)(void); |
fdfdb2b1 | 325 | u64 (*get_val)(struct cpudata*, int pstate); |
007bea09 | 326 | void (*get_vid)(struct cpudata *); |
67dd9bf4 RW |
327 | void (*update_util)(struct update_util_data *data, u64 time, |
328 | unsigned int flags); | |
93f0822d DB |
329 | }; |
330 | ||
4a7cb7a9 | 331 | static struct pstate_funcs pstate_funcs __read_mostly; |
5c439053 RW |
332 | static struct pstate_adjust_policy pid_params __read_mostly = { |
333 | .sample_rate_ms = 10, | |
334 | .sample_rate_ns = 10 * NSEC_PER_MSEC, | |
335 | .deadband = 0, | |
336 | .setpoint = 97, | |
337 | .p_gain_pct = 20, | |
338 | .d_gain_pct = 0, | |
339 | .i_gain_pct = 0, | |
340 | }; | |
341 | ||
4a7cb7a9 | 342 | static int hwp_active __read_mostly; |
eae48f04 | 343 | static bool per_cpu_limits __read_mostly; |
016c8150 | 344 | |
ee8df89a | 345 | static struct cpufreq_driver *intel_pstate_driver __read_mostly; |
0c30b65b | 346 | |
9522a2ff SP |
347 | #ifdef CONFIG_ACPI |
348 | static bool acpi_ppc; | |
349 | #endif | |
13ad7701 | 350 | |
c5a2ee7d | 351 | static struct global_params global; |
93f0822d | 352 | |
0c30b65b | 353 | static DEFINE_MUTEX(intel_pstate_driver_lock); |
a410c03d SP |
354 | static DEFINE_MUTEX(intel_pstate_limits_lock); |
355 | ||
9522a2ff | 356 | #ifdef CONFIG_ACPI |
2b3ec765 SP |
357 | |
358 | static bool intel_pstate_get_ppc_enable_status(void) | |
359 | { | |
360 | if (acpi_gbl_FADT.preferred_profile == PM_ENTERPRISE_SERVER || | |
361 | acpi_gbl_FADT.preferred_profile == PM_PERFORMANCE_SERVER) | |
362 | return true; | |
363 | ||
364 | return acpi_ppc; | |
365 | } | |
366 | ||
17669006 RW |
367 | #ifdef CONFIG_ACPI_CPPC_LIB |
368 | ||
369 | /* The work item is needed to avoid CPU hotplug locking issues */ | |
370 | static void intel_pstste_sched_itmt_work_fn(struct work_struct *work) | |
371 | { | |
372 | sched_set_itmt_support(); | |
373 | } | |
374 | ||
375 | static DECLARE_WORK(sched_itmt_work, intel_pstste_sched_itmt_work_fn); | |
376 | ||
377 | static void intel_pstate_set_itmt_prio(int cpu) | |
378 | { | |
379 | struct cppc_perf_caps cppc_perf; | |
380 | static u32 max_highest_perf = 0, min_highest_perf = U32_MAX; | |
381 | int ret; | |
382 | ||
383 | ret = cppc_get_perf_caps(cpu, &cppc_perf); | |
384 | if (ret) | |
385 | return; | |
386 | ||
387 | /* | |
388 | * The priorities can be set regardless of whether or not | |
389 | * sched_set_itmt_support(true) has been called and it is valid to | |
390 | * update them at any time after it has been called. | |
391 | */ | |
392 | sched_set_itmt_core_prio(cppc_perf.highest_perf, cpu); | |
393 | ||
394 | if (max_highest_perf <= min_highest_perf) { | |
395 | if (cppc_perf.highest_perf > max_highest_perf) | |
396 | max_highest_perf = cppc_perf.highest_perf; | |
397 | ||
398 | if (cppc_perf.highest_perf < min_highest_perf) | |
399 | min_highest_perf = cppc_perf.highest_perf; | |
400 | ||
401 | if (max_highest_perf > min_highest_perf) { | |
402 | /* | |
403 | * This code can be run during CPU online under the | |
404 | * CPU hotplug locks, so sched_set_itmt_support() | |
405 | * cannot be called from here. Queue up a work item | |
406 | * to invoke it. | |
407 | */ | |
408 | schedule_work(&sched_itmt_work); | |
409 | } | |
410 | } | |
411 | } | |
412 | #else | |
413 | static void intel_pstate_set_itmt_prio(int cpu) | |
414 | { | |
415 | } | |
416 | #endif | |
417 | ||
9522a2ff SP |
418 | static void intel_pstate_init_acpi_perf_limits(struct cpufreq_policy *policy) |
419 | { | |
420 | struct cpudata *cpu; | |
9522a2ff SP |
421 | int ret; |
422 | int i; | |
423 | ||
17669006 RW |
424 | if (hwp_active) { |
425 | intel_pstate_set_itmt_prio(policy->cpu); | |
e59a8f7f | 426 | return; |
17669006 | 427 | } |
e59a8f7f | 428 | |
2b3ec765 | 429 | if (!intel_pstate_get_ppc_enable_status()) |
9522a2ff SP |
430 | return; |
431 | ||
432 | cpu = all_cpu_data[policy->cpu]; | |
433 | ||
434 | ret = acpi_processor_register_performance(&cpu->acpi_perf_data, | |
435 | policy->cpu); | |
436 | if (ret) | |
437 | return; | |
438 | ||
439 | /* | |
440 | * Check if the control value in _PSS is for PERF_CTL MSR, which should | |
441 | * guarantee that the states returned by it map to the states in our | |
442 | * list directly. | |
443 | */ | |
444 | if (cpu->acpi_perf_data.control_register.space_id != | |
445 | ACPI_ADR_SPACE_FIXED_HARDWARE) | |
446 | goto err; | |
447 | ||
448 | /* | |
449 | * If there is only one entry _PSS, simply ignore _PSS and continue as | |
450 | * usual without taking _PSS into account | |
451 | */ | |
452 | if (cpu->acpi_perf_data.state_count < 2) | |
453 | goto err; | |
454 | ||
455 | pr_debug("CPU%u - ACPI _PSS perf data\n", policy->cpu); | |
456 | for (i = 0; i < cpu->acpi_perf_data.state_count; i++) { | |
457 | pr_debug(" %cP%d: %u MHz, %u mW, 0x%x\n", | |
458 | (i == cpu->acpi_perf_data.state ? '*' : ' '), i, | |
459 | (u32) cpu->acpi_perf_data.states[i].core_frequency, | |
460 | (u32) cpu->acpi_perf_data.states[i].power, | |
461 | (u32) cpu->acpi_perf_data.states[i].control); | |
462 | } | |
463 | ||
464 | /* | |
465 | * The _PSS table doesn't contain whole turbo frequency range. | |
466 | * This just contains +1 MHZ above the max non turbo frequency, | |
467 | * with control value corresponding to max turbo ratio. But | |
468 | * when cpufreq set policy is called, it will call with this | |
469 | * max frequency, which will cause a reduced performance as | |
470 | * this driver uses real max turbo frequency as the max | |
471 | * frequency. So correct this frequency in _PSS table to | |
b00345d1 | 472 | * correct max turbo frequency based on the turbo state. |
9522a2ff SP |
473 | * Also need to convert to MHz as _PSS freq is in MHz. |
474 | */ | |
7de32556 | 475 | if (!global.turbo_disabled) |
9522a2ff SP |
476 | cpu->acpi_perf_data.states[0].core_frequency = |
477 | policy->cpuinfo.max_freq / 1000; | |
478 | cpu->valid_pss_table = true; | |
6cacd115 | 479 | pr_debug("_PPC limits will be enforced\n"); |
9522a2ff SP |
480 | |
481 | return; | |
482 | ||
483 | err: | |
484 | cpu->valid_pss_table = false; | |
485 | acpi_processor_unregister_performance(policy->cpu); | |
486 | } | |
487 | ||
488 | static void intel_pstate_exit_perf_limits(struct cpufreq_policy *policy) | |
489 | { | |
490 | struct cpudata *cpu; | |
491 | ||
492 | cpu = all_cpu_data[policy->cpu]; | |
493 | if (!cpu->valid_pss_table) | |
494 | return; | |
495 | ||
496 | acpi_processor_unregister_performance(policy->cpu); | |
497 | } | |
9522a2ff | 498 | #else |
7a3ba767 | 499 | static inline void intel_pstate_init_acpi_perf_limits(struct cpufreq_policy *policy) |
9522a2ff SP |
500 | { |
501 | } | |
502 | ||
7a3ba767 | 503 | static inline void intel_pstate_exit_perf_limits(struct cpufreq_policy *policy) |
9522a2ff SP |
504 | { |
505 | } | |
506 | #endif | |
507 | ||
d253d2a5 | 508 | static signed int pid_calc(struct _pid *pid, int32_t busy) |
93f0822d | 509 | { |
d253d2a5 | 510 | signed int result; |
93f0822d DB |
511 | int32_t pterm, dterm, fp_error; |
512 | int32_t integral_limit; | |
513 | ||
b54a0dfd | 514 | fp_error = pid->setpoint - busy; |
93f0822d | 515 | |
b54a0dfd | 516 | if (abs(fp_error) <= pid->deadband) |
93f0822d DB |
517 | return 0; |
518 | ||
519 | pterm = mul_fp(pid->p_gain, fp_error); | |
520 | ||
521 | pid->integral += fp_error; | |
522 | ||
e0d4c8f8 KCA |
523 | /* |
524 | * We limit the integral here so that it will never | |
525 | * get higher than 30. This prevents it from becoming | |
526 | * too large an input over long periods of time and allows | |
527 | * it to get factored out sooner. | |
528 | * | |
529 | * The value of 30 was chosen through experimentation. | |
530 | */ | |
93f0822d DB |
531 | integral_limit = int_tofp(30); |
532 | if (pid->integral > integral_limit) | |
533 | pid->integral = integral_limit; | |
534 | if (pid->integral < -integral_limit) | |
535 | pid->integral = -integral_limit; | |
536 | ||
d253d2a5 BS |
537 | dterm = mul_fp(pid->d_gain, fp_error - pid->last_err); |
538 | pid->last_err = fp_error; | |
93f0822d DB |
539 | |
540 | result = pterm + mul_fp(pid->integral, pid->i_gain) + dterm; | |
51d211e9 | 541 | result = result + (1 << (FRAC_BITS-1)); |
93f0822d DB |
542 | return (signed int)fp_toint(result); |
543 | } | |
544 | ||
ff35f02e | 545 | static inline void intel_pstate_pid_reset(struct cpudata *cpu) |
93f0822d | 546 | { |
ff35f02e | 547 | struct _pid *pid = &cpu->pid; |
93f0822d | 548 | |
ff35f02e RW |
549 | pid->p_gain = percent_fp(pid_params.p_gain_pct); |
550 | pid->d_gain = percent_fp(pid_params.d_gain_pct); | |
551 | pid->i_gain = percent_fp(pid_params.i_gain_pct); | |
552 | pid->setpoint = int_tofp(pid_params.setpoint); | |
553 | pid->last_err = pid->setpoint - int_tofp(100); | |
554 | pid->deadband = int_tofp(pid_params.deadband); | |
555 | pid->integral = 0; | |
93f0822d DB |
556 | } |
557 | ||
4521e1a0 GM |
558 | static inline void update_turbo_state(void) |
559 | { | |
560 | u64 misc_en; | |
561 | struct cpudata *cpu; | |
562 | ||
563 | cpu = all_cpu_data[0]; | |
564 | rdmsrl(MSR_IA32_MISC_ENABLE, misc_en); | |
7de32556 | 565 | global.turbo_disabled = |
4521e1a0 GM |
566 | (misc_en & MSR_IA32_MISC_ENABLE_TURBO_DISABLE || |
567 | cpu->pstate.max_pstate == cpu->pstate.turbo_pstate); | |
568 | } | |
569 | ||
c5a2ee7d RW |
570 | static int min_perf_pct_min(void) |
571 | { | |
572 | struct cpudata *cpu = all_cpu_data[0]; | |
573 | ||
574 | return DIV_ROUND_UP(cpu->pstate.min_pstate * 100, | |
575 | cpu->pstate.turbo_pstate); | |
576 | } | |
577 | ||
8442885f SP |
578 | static s16 intel_pstate_get_epb(struct cpudata *cpu_data) |
579 | { | |
580 | u64 epb; | |
581 | int ret; | |
582 | ||
583 | if (!static_cpu_has(X86_FEATURE_EPB)) | |
584 | return -ENXIO; | |
585 | ||
586 | ret = rdmsrl_on_cpu(cpu_data->cpu, MSR_IA32_ENERGY_PERF_BIAS, &epb); | |
587 | if (ret) | |
588 | return (s16)ret; | |
589 | ||
590 | return (s16)(epb & 0x0f); | |
591 | } | |
592 | ||
593 | static s16 intel_pstate_get_epp(struct cpudata *cpu_data, u64 hwp_req_data) | |
594 | { | |
595 | s16 epp; | |
596 | ||
984edbdc SP |
597 | if (static_cpu_has(X86_FEATURE_HWP_EPP)) { |
598 | /* | |
599 | * When hwp_req_data is 0, means that caller didn't read | |
600 | * MSR_HWP_REQUEST, so need to read and get EPP. | |
601 | */ | |
602 | if (!hwp_req_data) { | |
603 | epp = rdmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST, | |
604 | &hwp_req_data); | |
605 | if (epp) | |
606 | return epp; | |
607 | } | |
8442885f | 608 | epp = (hwp_req_data >> 24) & 0xff; |
984edbdc | 609 | } else { |
8442885f SP |
610 | /* When there is no EPP present, HWP uses EPB settings */ |
611 | epp = intel_pstate_get_epb(cpu_data); | |
984edbdc | 612 | } |
8442885f SP |
613 | |
614 | return epp; | |
615 | } | |
616 | ||
984edbdc | 617 | static int intel_pstate_set_epb(int cpu, s16 pref) |
8442885f SP |
618 | { |
619 | u64 epb; | |
984edbdc | 620 | int ret; |
8442885f SP |
621 | |
622 | if (!static_cpu_has(X86_FEATURE_EPB)) | |
984edbdc | 623 | return -ENXIO; |
8442885f | 624 | |
984edbdc SP |
625 | ret = rdmsrl_on_cpu(cpu, MSR_IA32_ENERGY_PERF_BIAS, &epb); |
626 | if (ret) | |
627 | return ret; | |
8442885f SP |
628 | |
629 | epb = (epb & ~0x0f) | pref; | |
630 | wrmsrl_on_cpu(cpu, MSR_IA32_ENERGY_PERF_BIAS, epb); | |
984edbdc SP |
631 | |
632 | return 0; | |
8442885f SP |
633 | } |
634 | ||
984edbdc SP |
635 | /* |
636 | * EPP/EPB display strings corresponding to EPP index in the | |
637 | * energy_perf_strings[] | |
638 | * index String | |
639 | *------------------------------------- | |
640 | * 0 default | |
641 | * 1 performance | |
642 | * 2 balance_performance | |
643 | * 3 balance_power | |
644 | * 4 power | |
645 | */ | |
646 | static const char * const energy_perf_strings[] = { | |
647 | "default", | |
648 | "performance", | |
649 | "balance_performance", | |
650 | "balance_power", | |
651 | "power", | |
652 | NULL | |
653 | }; | |
654 | ||
655 | static int intel_pstate_get_energy_pref_index(struct cpudata *cpu_data) | |
656 | { | |
657 | s16 epp; | |
658 | int index = -EINVAL; | |
659 | ||
660 | epp = intel_pstate_get_epp(cpu_data, 0); | |
661 | if (epp < 0) | |
662 | return epp; | |
663 | ||
664 | if (static_cpu_has(X86_FEATURE_HWP_EPP)) { | |
665 | /* | |
666 | * Range: | |
667 | * 0x00-0x3F : Performance | |
668 | * 0x40-0x7F : Balance performance | |
669 | * 0x80-0xBF : Balance power | |
670 | * 0xC0-0xFF : Power | |
671 | * The EPP is a 8 bit value, but our ranges restrict the | |
672 | * value which can be set. Here only using top two bits | |
673 | * effectively. | |
674 | */ | |
675 | index = (epp >> 6) + 1; | |
676 | } else if (static_cpu_has(X86_FEATURE_EPB)) { | |
677 | /* | |
678 | * Range: | |
679 | * 0x00-0x03 : Performance | |
680 | * 0x04-0x07 : Balance performance | |
681 | * 0x08-0x0B : Balance power | |
682 | * 0x0C-0x0F : Power | |
683 | * The EPB is a 4 bit value, but our ranges restrict the | |
684 | * value which can be set. Here only using top two bits | |
685 | * effectively. | |
686 | */ | |
687 | index = (epp >> 2) + 1; | |
688 | } | |
689 | ||
690 | return index; | |
691 | } | |
692 | ||
693 | static int intel_pstate_set_energy_pref_index(struct cpudata *cpu_data, | |
694 | int pref_index) | |
695 | { | |
696 | int epp = -EINVAL; | |
697 | int ret; | |
698 | ||
699 | if (!pref_index) | |
700 | epp = cpu_data->epp_default; | |
701 | ||
702 | mutex_lock(&intel_pstate_limits_lock); | |
703 | ||
704 | if (static_cpu_has(X86_FEATURE_HWP_EPP)) { | |
705 | u64 value; | |
706 | ||
707 | ret = rdmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST, &value); | |
708 | if (ret) | |
709 | goto return_pref; | |
710 | ||
711 | value &= ~GENMASK_ULL(31, 24); | |
712 | ||
713 | /* | |
714 | * If epp is not default, convert from index into | |
715 | * energy_perf_strings to epp value, by shifting 6 | |
716 | * bits left to use only top two bits in epp. | |
717 | * The resultant epp need to shifted by 24 bits to | |
718 | * epp position in MSR_HWP_REQUEST. | |
719 | */ | |
720 | if (epp == -EINVAL) | |
721 | epp = (pref_index - 1) << 6; | |
722 | ||
723 | value |= (u64)epp << 24; | |
724 | ret = wrmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST, value); | |
725 | } else { | |
726 | if (epp == -EINVAL) | |
727 | epp = (pref_index - 1) << 2; | |
728 | ret = intel_pstate_set_epb(cpu_data->cpu, epp); | |
729 | } | |
730 | return_pref: | |
731 | mutex_unlock(&intel_pstate_limits_lock); | |
732 | ||
733 | return ret; | |
734 | } | |
735 | ||
736 | static ssize_t show_energy_performance_available_preferences( | |
737 | struct cpufreq_policy *policy, char *buf) | |
738 | { | |
739 | int i = 0; | |
740 | int ret = 0; | |
741 | ||
742 | while (energy_perf_strings[i] != NULL) | |
743 | ret += sprintf(&buf[ret], "%s ", energy_perf_strings[i++]); | |
744 | ||
745 | ret += sprintf(&buf[ret], "\n"); | |
746 | ||
747 | return ret; | |
748 | } | |
749 | ||
750 | cpufreq_freq_attr_ro(energy_performance_available_preferences); | |
751 | ||
752 | static ssize_t store_energy_performance_preference( | |
753 | struct cpufreq_policy *policy, const char *buf, size_t count) | |
754 | { | |
755 | struct cpudata *cpu_data = all_cpu_data[policy->cpu]; | |
756 | char str_preference[21]; | |
757 | int ret, i = 0; | |
758 | ||
759 | ret = sscanf(buf, "%20s", str_preference); | |
760 | if (ret != 1) | |
761 | return -EINVAL; | |
762 | ||
763 | while (energy_perf_strings[i] != NULL) { | |
764 | if (!strcmp(str_preference, energy_perf_strings[i])) { | |
765 | intel_pstate_set_energy_pref_index(cpu_data, i); | |
766 | return count; | |
767 | } | |
768 | ++i; | |
769 | } | |
770 | ||
771 | return -EINVAL; | |
772 | } | |
773 | ||
774 | static ssize_t show_energy_performance_preference( | |
775 | struct cpufreq_policy *policy, char *buf) | |
776 | { | |
777 | struct cpudata *cpu_data = all_cpu_data[policy->cpu]; | |
778 | int preference; | |
779 | ||
780 | preference = intel_pstate_get_energy_pref_index(cpu_data); | |
781 | if (preference < 0) | |
782 | return preference; | |
783 | ||
784 | return sprintf(buf, "%s\n", energy_perf_strings[preference]); | |
785 | } | |
786 | ||
787 | cpufreq_freq_attr_rw(energy_performance_preference); | |
788 | ||
789 | static struct freq_attr *hwp_cpufreq_attrs[] = { | |
790 | &energy_performance_preference, | |
791 | &energy_performance_available_preferences, | |
792 | NULL, | |
793 | }; | |
794 | ||
2bfc4cbb | 795 | static void intel_pstate_hwp_set(unsigned int cpu) |
2f86dc4c | 796 | { |
2bfc4cbb RW |
797 | struct cpudata *cpu_data = all_cpu_data[cpu]; |
798 | int min, hw_min, max, hw_max; | |
74da56ce | 799 | u64 value, cap; |
2bfc4cbb | 800 | s16 epp; |
74da56ce | 801 | |
2bfc4cbb RW |
802 | rdmsrl_on_cpu(cpu, MSR_HWP_CAPABILITIES, &cap); |
803 | hw_min = HWP_LOWEST_PERF(cap); | |
804 | if (global.no_turbo) | |
805 | hw_max = HWP_GUARANTEED_PERF(cap); | |
806 | else | |
807 | hw_max = HWP_HIGHEST_PERF(cap); | |
eae48f04 | 808 | |
2bfc4cbb RW |
809 | max = fp_ext_toint(hw_max * cpu_data->max_perf); |
810 | if (cpu_data->policy == CPUFREQ_POLICY_PERFORMANCE) | |
811 | min = max; | |
812 | else | |
813 | min = fp_ext_toint(hw_max * cpu_data->min_perf); | |
3f8ed54a | 814 | |
2bfc4cbb | 815 | rdmsrl_on_cpu(cpu, MSR_HWP_REQUEST, &value); |
2f86dc4c | 816 | |
2bfc4cbb RW |
817 | value &= ~HWP_MIN_PERF(~0L); |
818 | value |= HWP_MIN_PERF(min); | |
8442885f | 819 | |
2bfc4cbb RW |
820 | value &= ~HWP_MAX_PERF(~0L); |
821 | value |= HWP_MAX_PERF(max); | |
8442885f | 822 | |
2bfc4cbb RW |
823 | if (cpu_data->epp_policy == cpu_data->policy) |
824 | goto skip_epp; | |
8442885f | 825 | |
2bfc4cbb | 826 | cpu_data->epp_policy = cpu_data->policy; |
984edbdc | 827 | |
2bfc4cbb RW |
828 | if (cpu_data->epp_saved >= 0) { |
829 | epp = cpu_data->epp_saved; | |
830 | cpu_data->epp_saved = -EINVAL; | |
831 | goto update_epp; | |
832 | } | |
8442885f | 833 | |
2bfc4cbb RW |
834 | if (cpu_data->policy == CPUFREQ_POLICY_PERFORMANCE) { |
835 | epp = intel_pstate_get_epp(cpu_data, value); | |
836 | cpu_data->epp_powersave = epp; | |
837 | /* If EPP read was failed, then don't try to write */ | |
838 | if (epp < 0) | |
839 | goto skip_epp; | |
8442885f | 840 | |
2bfc4cbb RW |
841 | epp = 0; |
842 | } else { | |
843 | /* skip setting EPP, when saved value is invalid */ | |
844 | if (cpu_data->epp_powersave < 0) | |
845 | goto skip_epp; | |
8442885f | 846 | |
2bfc4cbb RW |
847 | /* |
848 | * No need to restore EPP when it is not zero. This | |
849 | * means: | |
850 | * - Policy is not changed | |
851 | * - user has manually changed | |
852 | * - Error reading EPB | |
853 | */ | |
854 | epp = intel_pstate_get_epp(cpu_data, value); | |
855 | if (epp) | |
856 | goto skip_epp; | |
8442885f | 857 | |
2bfc4cbb RW |
858 | epp = cpu_data->epp_powersave; |
859 | } | |
984edbdc | 860 | update_epp: |
2bfc4cbb RW |
861 | if (static_cpu_has(X86_FEATURE_HWP_EPP)) { |
862 | value &= ~GENMASK_ULL(31, 24); | |
863 | value |= (u64)epp << 24; | |
864 | } else { | |
865 | intel_pstate_set_epb(cpu, epp); | |
2f86dc4c | 866 | } |
2bfc4cbb RW |
867 | skip_epp: |
868 | wrmsrl_on_cpu(cpu, MSR_HWP_REQUEST, value); | |
41cfd64c | 869 | } |
2f86dc4c | 870 | |
984edbdc SP |
871 | static int intel_pstate_hwp_save_state(struct cpufreq_policy *policy) |
872 | { | |
873 | struct cpudata *cpu_data = all_cpu_data[policy->cpu]; | |
874 | ||
875 | if (!hwp_active) | |
876 | return 0; | |
877 | ||
878 | cpu_data->epp_saved = intel_pstate_get_epp(cpu_data, 0); | |
879 | ||
880 | return 0; | |
881 | } | |
882 | ||
8442885f SP |
883 | static int intel_pstate_resume(struct cpufreq_policy *policy) |
884 | { | |
885 | if (!hwp_active) | |
886 | return 0; | |
887 | ||
aa439248 RW |
888 | mutex_lock(&intel_pstate_limits_lock); |
889 | ||
8442885f | 890 | all_cpu_data[policy->cpu]->epp_policy = 0; |
2bfc4cbb | 891 | intel_pstate_hwp_set(policy->cpu); |
aa439248 RW |
892 | |
893 | mutex_unlock(&intel_pstate_limits_lock); | |
894 | ||
5f98ced1 | 895 | return 0; |
8442885f SP |
896 | } |
897 | ||
111b8b3f | 898 | static void intel_pstate_update_policies(void) |
41cfd64c | 899 | { |
111b8b3f RW |
900 | int cpu; |
901 | ||
902 | for_each_possible_cpu(cpu) | |
903 | cpufreq_update_policy(cpu); | |
2f86dc4c DB |
904 | } |
905 | ||
93f0822d DB |
906 | /************************** debugfs begin ************************/ |
907 | static int pid_param_set(void *data, u64 val) | |
908 | { | |
4ddd0146 RW |
909 | unsigned int cpu; |
910 | ||
93f0822d | 911 | *(u32 *)data = val; |
6e7408ac | 912 | pid_params.sample_rate_ns = pid_params.sample_rate_ms * NSEC_PER_MSEC; |
4ddd0146 RW |
913 | for_each_possible_cpu(cpu) |
914 | if (all_cpu_data[cpu]) | |
ff35f02e | 915 | intel_pstate_pid_reset(all_cpu_data[cpu]); |
4ddd0146 | 916 | |
93f0822d DB |
917 | return 0; |
918 | } | |
845c1cbe | 919 | |
93f0822d DB |
920 | static int pid_param_get(void *data, u64 *val) |
921 | { | |
922 | *val = *(u32 *)data; | |
923 | return 0; | |
924 | } | |
2d8d1f18 | 925 | DEFINE_SIMPLE_ATTRIBUTE(fops_pid_param, pid_param_get, pid_param_set, "%llu\n"); |
93f0822d | 926 | |
fb1fe104 RW |
927 | static struct dentry *debugfs_parent; |
928 | ||
93f0822d DB |
929 | struct pid_param { |
930 | char *name; | |
931 | void *value; | |
fb1fe104 | 932 | struct dentry *dentry; |
93f0822d DB |
933 | }; |
934 | ||
935 | static struct pid_param pid_files[] = { | |
fb1fe104 RW |
936 | {"sample_rate_ms", &pid_params.sample_rate_ms, }, |
937 | {"d_gain_pct", &pid_params.d_gain_pct, }, | |
938 | {"i_gain_pct", &pid_params.i_gain_pct, }, | |
939 | {"deadband", &pid_params.deadband, }, | |
940 | {"setpoint", &pid_params.setpoint, }, | |
941 | {"p_gain_pct", &pid_params.p_gain_pct, }, | |
942 | {NULL, NULL, } | |
93f0822d DB |
943 | }; |
944 | ||
fb1fe104 | 945 | static void intel_pstate_debug_expose_params(void) |
93f0822d | 946 | { |
fb1fe104 | 947 | int i; |
93f0822d DB |
948 | |
949 | debugfs_parent = debugfs_create_dir("pstate_snb", NULL); | |
950 | if (IS_ERR_OR_NULL(debugfs_parent)) | |
951 | return; | |
fb1fe104 RW |
952 | |
953 | for (i = 0; pid_files[i].name; i++) { | |
954 | struct dentry *dentry; | |
955 | ||
956 | dentry = debugfs_create_file(pid_files[i].name, 0660, | |
957 | debugfs_parent, pid_files[i].value, | |
958 | &fops_pid_param); | |
959 | if (!IS_ERR(dentry)) | |
960 | pid_files[i].dentry = dentry; | |
93f0822d DB |
961 | } |
962 | } | |
963 | ||
fb1fe104 RW |
964 | static void intel_pstate_debug_hide_params(void) |
965 | { | |
966 | int i; | |
967 | ||
968 | if (IS_ERR_OR_NULL(debugfs_parent)) | |
969 | return; | |
970 | ||
971 | for (i = 0; pid_files[i].name; i++) { | |
972 | debugfs_remove(pid_files[i].dentry); | |
973 | pid_files[i].dentry = NULL; | |
93f0822d | 974 | } |
fb1fe104 RW |
975 | |
976 | debugfs_remove(debugfs_parent); | |
977 | debugfs_parent = NULL; | |
93f0822d DB |
978 | } |
979 | ||
980 | /************************** debugfs end ************************/ | |
981 | ||
982 | /************************** sysfs begin ************************/ | |
983 | #define show_one(file_name, object) \ | |
984 | static ssize_t show_##file_name \ | |
985 | (struct kobject *kobj, struct attribute *attr, char *buf) \ | |
986 | { \ | |
7de32556 | 987 | return sprintf(buf, "%u\n", global.object); \ |
93f0822d DB |
988 | } |
989 | ||
fb1fe104 RW |
990 | static ssize_t intel_pstate_show_status(char *buf); |
991 | static int intel_pstate_update_status(const char *buf, size_t size); | |
992 | ||
993 | static ssize_t show_status(struct kobject *kobj, | |
994 | struct attribute *attr, char *buf) | |
995 | { | |
996 | ssize_t ret; | |
997 | ||
998 | mutex_lock(&intel_pstate_driver_lock); | |
999 | ret = intel_pstate_show_status(buf); | |
1000 | mutex_unlock(&intel_pstate_driver_lock); | |
1001 | ||
1002 | return ret; | |
1003 | } | |
1004 | ||
1005 | static ssize_t store_status(struct kobject *a, struct attribute *b, | |
1006 | const char *buf, size_t count) | |
1007 | { | |
1008 | char *p = memchr(buf, '\n', count); | |
1009 | int ret; | |
1010 | ||
1011 | mutex_lock(&intel_pstate_driver_lock); | |
1012 | ret = intel_pstate_update_status(buf, p ? p - buf : count); | |
1013 | mutex_unlock(&intel_pstate_driver_lock); | |
1014 | ||
1015 | return ret < 0 ? ret : count; | |
1016 | } | |
1017 | ||
d01b1f48 KCA |
1018 | static ssize_t show_turbo_pct(struct kobject *kobj, |
1019 | struct attribute *attr, char *buf) | |
1020 | { | |
1021 | struct cpudata *cpu; | |
1022 | int total, no_turbo, turbo_pct; | |
1023 | uint32_t turbo_fp; | |
1024 | ||
0c30b65b RW |
1025 | mutex_lock(&intel_pstate_driver_lock); |
1026 | ||
ee8df89a | 1027 | if (!intel_pstate_driver) { |
0c30b65b RW |
1028 | mutex_unlock(&intel_pstate_driver_lock); |
1029 | return -EAGAIN; | |
1030 | } | |
1031 | ||
d01b1f48 KCA |
1032 | cpu = all_cpu_data[0]; |
1033 | ||
1034 | total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1; | |
1035 | no_turbo = cpu->pstate.max_pstate - cpu->pstate.min_pstate + 1; | |
22590efb | 1036 | turbo_fp = div_fp(no_turbo, total); |
d01b1f48 | 1037 | turbo_pct = 100 - fp_toint(mul_fp(turbo_fp, int_tofp(100))); |
0c30b65b RW |
1038 | |
1039 | mutex_unlock(&intel_pstate_driver_lock); | |
1040 | ||
d01b1f48 KCA |
1041 | return sprintf(buf, "%u\n", turbo_pct); |
1042 | } | |
1043 | ||
0522424e KCA |
1044 | static ssize_t show_num_pstates(struct kobject *kobj, |
1045 | struct attribute *attr, char *buf) | |
1046 | { | |
1047 | struct cpudata *cpu; | |
1048 | int total; | |
1049 | ||
0c30b65b RW |
1050 | mutex_lock(&intel_pstate_driver_lock); |
1051 | ||
ee8df89a | 1052 | if (!intel_pstate_driver) { |
0c30b65b RW |
1053 | mutex_unlock(&intel_pstate_driver_lock); |
1054 | return -EAGAIN; | |
1055 | } | |
1056 | ||
0522424e KCA |
1057 | cpu = all_cpu_data[0]; |
1058 | total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1; | |
0c30b65b RW |
1059 | |
1060 | mutex_unlock(&intel_pstate_driver_lock); | |
1061 | ||
0522424e KCA |
1062 | return sprintf(buf, "%u\n", total); |
1063 | } | |
1064 | ||
4521e1a0 GM |
1065 | static ssize_t show_no_turbo(struct kobject *kobj, |
1066 | struct attribute *attr, char *buf) | |
1067 | { | |
1068 | ssize_t ret; | |
1069 | ||
0c30b65b RW |
1070 | mutex_lock(&intel_pstate_driver_lock); |
1071 | ||
ee8df89a | 1072 | if (!intel_pstate_driver) { |
0c30b65b RW |
1073 | mutex_unlock(&intel_pstate_driver_lock); |
1074 | return -EAGAIN; | |
1075 | } | |
1076 | ||
4521e1a0 | 1077 | update_turbo_state(); |
7de32556 RW |
1078 | if (global.turbo_disabled) |
1079 | ret = sprintf(buf, "%u\n", global.turbo_disabled); | |
4521e1a0 | 1080 | else |
7de32556 | 1081 | ret = sprintf(buf, "%u\n", global.no_turbo); |
4521e1a0 | 1082 | |
0c30b65b RW |
1083 | mutex_unlock(&intel_pstate_driver_lock); |
1084 | ||
4521e1a0 GM |
1085 | return ret; |
1086 | } | |
1087 | ||
93f0822d | 1088 | static ssize_t store_no_turbo(struct kobject *a, struct attribute *b, |
c410833a | 1089 | const char *buf, size_t count) |
93f0822d DB |
1090 | { |
1091 | unsigned int input; | |
1092 | int ret; | |
845c1cbe | 1093 | |
93f0822d DB |
1094 | ret = sscanf(buf, "%u", &input); |
1095 | if (ret != 1) | |
1096 | return -EINVAL; | |
4521e1a0 | 1097 | |
0c30b65b RW |
1098 | mutex_lock(&intel_pstate_driver_lock); |
1099 | ||
ee8df89a | 1100 | if (!intel_pstate_driver) { |
0c30b65b RW |
1101 | mutex_unlock(&intel_pstate_driver_lock); |
1102 | return -EAGAIN; | |
1103 | } | |
1104 | ||
a410c03d SP |
1105 | mutex_lock(&intel_pstate_limits_lock); |
1106 | ||
4521e1a0 | 1107 | update_turbo_state(); |
7de32556 | 1108 | if (global.turbo_disabled) { |
4836df17 | 1109 | pr_warn("Turbo disabled by BIOS or unavailable on processor\n"); |
a410c03d | 1110 | mutex_unlock(&intel_pstate_limits_lock); |
0c30b65b | 1111 | mutex_unlock(&intel_pstate_driver_lock); |
4521e1a0 | 1112 | return -EPERM; |
dd5fbf70 | 1113 | } |
2f86dc4c | 1114 | |
7de32556 | 1115 | global.no_turbo = clamp_t(int, input, 0, 1); |
111b8b3f | 1116 | |
c5a2ee7d RW |
1117 | if (global.no_turbo) { |
1118 | struct cpudata *cpu = all_cpu_data[0]; | |
1119 | int pct = cpu->pstate.max_pstate * 100 / cpu->pstate.turbo_pstate; | |
1120 | ||
1121 | /* Squash the global minimum into the permitted range. */ | |
1122 | if (global.min_perf_pct > pct) | |
1123 | global.min_perf_pct = pct; | |
1124 | } | |
1125 | ||
cd59b4be RW |
1126 | mutex_unlock(&intel_pstate_limits_lock); |
1127 | ||
7de32556 RW |
1128 | intel_pstate_update_policies(); |
1129 | ||
0c30b65b RW |
1130 | mutex_unlock(&intel_pstate_driver_lock); |
1131 | ||
93f0822d DB |
1132 | return count; |
1133 | } | |
1134 | ||
1135 | static ssize_t store_max_perf_pct(struct kobject *a, struct attribute *b, | |
c410833a | 1136 | const char *buf, size_t count) |
93f0822d DB |
1137 | { |
1138 | unsigned int input; | |
1139 | int ret; | |
845c1cbe | 1140 | |
93f0822d DB |
1141 | ret = sscanf(buf, "%u", &input); |
1142 | if (ret != 1) | |
1143 | return -EINVAL; | |
1144 | ||
0c30b65b RW |
1145 | mutex_lock(&intel_pstate_driver_lock); |
1146 | ||
ee8df89a | 1147 | if (!intel_pstate_driver) { |
0c30b65b RW |
1148 | mutex_unlock(&intel_pstate_driver_lock); |
1149 | return -EAGAIN; | |
1150 | } | |
1151 | ||
a410c03d SP |
1152 | mutex_lock(&intel_pstate_limits_lock); |
1153 | ||
c5a2ee7d | 1154 | global.max_perf_pct = clamp_t(int, input, global.min_perf_pct, 100); |
111b8b3f | 1155 | |
cd59b4be RW |
1156 | mutex_unlock(&intel_pstate_limits_lock); |
1157 | ||
7de32556 RW |
1158 | intel_pstate_update_policies(); |
1159 | ||
0c30b65b RW |
1160 | mutex_unlock(&intel_pstate_driver_lock); |
1161 | ||
93f0822d DB |
1162 | return count; |
1163 | } | |
1164 | ||
1165 | static ssize_t store_min_perf_pct(struct kobject *a, struct attribute *b, | |
c410833a | 1166 | const char *buf, size_t count) |
93f0822d DB |
1167 | { |
1168 | unsigned int input; | |
1169 | int ret; | |
845c1cbe | 1170 | |
93f0822d DB |
1171 | ret = sscanf(buf, "%u", &input); |
1172 | if (ret != 1) | |
1173 | return -EINVAL; | |
a0475992 | 1174 | |
0c30b65b RW |
1175 | mutex_lock(&intel_pstate_driver_lock); |
1176 | ||
ee8df89a | 1177 | if (!intel_pstate_driver) { |
0c30b65b RW |
1178 | mutex_unlock(&intel_pstate_driver_lock); |
1179 | return -EAGAIN; | |
1180 | } | |
1181 | ||
a410c03d SP |
1182 | mutex_lock(&intel_pstate_limits_lock); |
1183 | ||
c5a2ee7d RW |
1184 | global.min_perf_pct = clamp_t(int, input, |
1185 | min_perf_pct_min(), global.max_perf_pct); | |
111b8b3f | 1186 | |
cd59b4be RW |
1187 | mutex_unlock(&intel_pstate_limits_lock); |
1188 | ||
7de32556 RW |
1189 | intel_pstate_update_policies(); |
1190 | ||
0c30b65b RW |
1191 | mutex_unlock(&intel_pstate_driver_lock); |
1192 | ||
93f0822d DB |
1193 | return count; |
1194 | } | |
1195 | ||
93f0822d DB |
1196 | show_one(max_perf_pct, max_perf_pct); |
1197 | show_one(min_perf_pct, min_perf_pct); | |
1198 | ||
fb1fe104 | 1199 | define_one_global_rw(status); |
93f0822d DB |
1200 | define_one_global_rw(no_turbo); |
1201 | define_one_global_rw(max_perf_pct); | |
1202 | define_one_global_rw(min_perf_pct); | |
d01b1f48 | 1203 | define_one_global_ro(turbo_pct); |
0522424e | 1204 | define_one_global_ro(num_pstates); |
93f0822d DB |
1205 | |
1206 | static struct attribute *intel_pstate_attributes[] = { | |
fb1fe104 | 1207 | &status.attr, |
93f0822d | 1208 | &no_turbo.attr, |
d01b1f48 | 1209 | &turbo_pct.attr, |
0522424e | 1210 | &num_pstates.attr, |
93f0822d DB |
1211 | NULL |
1212 | }; | |
1213 | ||
1214 | static struct attribute_group intel_pstate_attr_group = { | |
1215 | .attrs = intel_pstate_attributes, | |
1216 | }; | |
93f0822d | 1217 | |
317dd50e | 1218 | static void __init intel_pstate_sysfs_expose_params(void) |
93f0822d | 1219 | { |
317dd50e | 1220 | struct kobject *intel_pstate_kobject; |
93f0822d DB |
1221 | int rc; |
1222 | ||
1223 | intel_pstate_kobject = kobject_create_and_add("intel_pstate", | |
1224 | &cpu_subsys.dev_root->kobj); | |
eae48f04 SP |
1225 | if (WARN_ON(!intel_pstate_kobject)) |
1226 | return; | |
1227 | ||
2d8d1f18 | 1228 | rc = sysfs_create_group(intel_pstate_kobject, &intel_pstate_attr_group); |
eae48f04 SP |
1229 | if (WARN_ON(rc)) |
1230 | return; | |
1231 | ||
1232 | /* | |
1233 | * If per cpu limits are enforced there are no global limits, so | |
1234 | * return without creating max/min_perf_pct attributes | |
1235 | */ | |
1236 | if (per_cpu_limits) | |
1237 | return; | |
1238 | ||
1239 | rc = sysfs_create_file(intel_pstate_kobject, &max_perf_pct.attr); | |
1240 | WARN_ON(rc); | |
1241 | ||
1242 | rc = sysfs_create_file(intel_pstate_kobject, &min_perf_pct.attr); | |
1243 | WARN_ON(rc); | |
1244 | ||
93f0822d | 1245 | } |
93f0822d | 1246 | /************************** sysfs end ************************/ |
2f86dc4c | 1247 | |
ba88d433 | 1248 | static void intel_pstate_hwp_enable(struct cpudata *cpudata) |
2f86dc4c | 1249 | { |
f05c9665 | 1250 | /* First disable HWP notification interrupt as we don't process them */ |
da7de91c SP |
1251 | if (static_cpu_has(X86_FEATURE_HWP_NOTIFY)) |
1252 | wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x00); | |
f05c9665 | 1253 | |
ba88d433 | 1254 | wrmsrl_on_cpu(cpudata->cpu, MSR_PM_ENABLE, 0x1); |
8442885f | 1255 | cpudata->epp_policy = 0; |
984edbdc SP |
1256 | if (cpudata->epp_default == -EINVAL) |
1257 | cpudata->epp_default = intel_pstate_get_epp(cpudata, 0); | |
2f86dc4c DB |
1258 | } |
1259 | ||
6e978b22 SP |
1260 | #define MSR_IA32_POWER_CTL_BIT_EE 19 |
1261 | ||
1262 | /* Disable energy efficiency optimization */ | |
1263 | static void intel_pstate_disable_ee(int cpu) | |
1264 | { | |
1265 | u64 power_ctl; | |
1266 | int ret; | |
1267 | ||
1268 | ret = rdmsrl_on_cpu(cpu, MSR_IA32_POWER_CTL, &power_ctl); | |
1269 | if (ret) | |
1270 | return; | |
1271 | ||
1272 | if (!(power_ctl & BIT(MSR_IA32_POWER_CTL_BIT_EE))) { | |
1273 | pr_info("Disabling energy efficiency optimization\n"); | |
1274 | power_ctl |= BIT(MSR_IA32_POWER_CTL_BIT_EE); | |
1275 | wrmsrl_on_cpu(cpu, MSR_IA32_POWER_CTL, power_ctl); | |
1276 | } | |
1277 | } | |
1278 | ||
938d21a2 | 1279 | static int atom_get_min_pstate(void) |
19e77c28 DB |
1280 | { |
1281 | u64 value; | |
845c1cbe | 1282 | |
92134bdb | 1283 | rdmsrl(MSR_ATOM_CORE_RATIOS, value); |
c16ed060 | 1284 | return (value >> 8) & 0x7F; |
19e77c28 DB |
1285 | } |
1286 | ||
938d21a2 | 1287 | static int atom_get_max_pstate(void) |
19e77c28 DB |
1288 | { |
1289 | u64 value; | |
845c1cbe | 1290 | |
92134bdb | 1291 | rdmsrl(MSR_ATOM_CORE_RATIOS, value); |
c16ed060 | 1292 | return (value >> 16) & 0x7F; |
19e77c28 | 1293 | } |
93f0822d | 1294 | |
938d21a2 | 1295 | static int atom_get_turbo_pstate(void) |
61d8d2ab DB |
1296 | { |
1297 | u64 value; | |
845c1cbe | 1298 | |
92134bdb | 1299 | rdmsrl(MSR_ATOM_CORE_TURBO_RATIOS, value); |
c16ed060 | 1300 | return value & 0x7F; |
61d8d2ab DB |
1301 | } |
1302 | ||
fdfdb2b1 | 1303 | static u64 atom_get_val(struct cpudata *cpudata, int pstate) |
007bea09 DB |
1304 | { |
1305 | u64 val; | |
1306 | int32_t vid_fp; | |
1307 | u32 vid; | |
1308 | ||
144c8e17 | 1309 | val = (u64)pstate << 8; |
7de32556 | 1310 | if (global.no_turbo && !global.turbo_disabled) |
007bea09 DB |
1311 | val |= (u64)1 << 32; |
1312 | ||
1313 | vid_fp = cpudata->vid.min + mul_fp( | |
1314 | int_tofp(pstate - cpudata->pstate.min_pstate), | |
1315 | cpudata->vid.ratio); | |
1316 | ||
1317 | vid_fp = clamp_t(int32_t, vid_fp, cpudata->vid.min, cpudata->vid.max); | |
d022a65e | 1318 | vid = ceiling_fp(vid_fp); |
007bea09 | 1319 | |
21855ff5 DB |
1320 | if (pstate > cpudata->pstate.max_pstate) |
1321 | vid = cpudata->vid.turbo; | |
1322 | ||
fdfdb2b1 | 1323 | return val | vid; |
007bea09 DB |
1324 | } |
1325 | ||
1421df63 | 1326 | static int silvermont_get_scaling(void) |
b27580b0 DB |
1327 | { |
1328 | u64 value; | |
1329 | int i; | |
1421df63 PL |
1330 | /* Defined in Table 35-6 from SDM (Sept 2015) */ |
1331 | static int silvermont_freq_table[] = { | |
1332 | 83300, 100000, 133300, 116700, 80000}; | |
b27580b0 DB |
1333 | |
1334 | rdmsrl(MSR_FSB_FREQ, value); | |
1421df63 PL |
1335 | i = value & 0x7; |
1336 | WARN_ON(i > 4); | |
b27580b0 | 1337 | |
1421df63 PL |
1338 | return silvermont_freq_table[i]; |
1339 | } | |
b27580b0 | 1340 | |
1421df63 PL |
1341 | static int airmont_get_scaling(void) |
1342 | { | |
1343 | u64 value; | |
1344 | int i; | |
1345 | /* Defined in Table 35-10 from SDM (Sept 2015) */ | |
1346 | static int airmont_freq_table[] = { | |
1347 | 83300, 100000, 133300, 116700, 80000, | |
1348 | 93300, 90000, 88900, 87500}; | |
1349 | ||
1350 | rdmsrl(MSR_FSB_FREQ, value); | |
1351 | i = value & 0xF; | |
1352 | WARN_ON(i > 8); | |
1353 | ||
1354 | return airmont_freq_table[i]; | |
b27580b0 DB |
1355 | } |
1356 | ||
938d21a2 | 1357 | static void atom_get_vid(struct cpudata *cpudata) |
007bea09 DB |
1358 | { |
1359 | u64 value; | |
1360 | ||
92134bdb | 1361 | rdmsrl(MSR_ATOM_CORE_VIDS, value); |
c16ed060 DB |
1362 | cpudata->vid.min = int_tofp((value >> 8) & 0x7f); |
1363 | cpudata->vid.max = int_tofp((value >> 16) & 0x7f); | |
007bea09 DB |
1364 | cpudata->vid.ratio = div_fp( |
1365 | cpudata->vid.max - cpudata->vid.min, | |
1366 | int_tofp(cpudata->pstate.max_pstate - | |
1367 | cpudata->pstate.min_pstate)); | |
21855ff5 | 1368 | |
92134bdb | 1369 | rdmsrl(MSR_ATOM_CORE_TURBO_VIDS, value); |
21855ff5 | 1370 | cpudata->vid.turbo = value & 0x7f; |
007bea09 DB |
1371 | } |
1372 | ||
016c8150 | 1373 | static int core_get_min_pstate(void) |
93f0822d DB |
1374 | { |
1375 | u64 value; | |
845c1cbe | 1376 | |
05e99c8c | 1377 | rdmsrl(MSR_PLATFORM_INFO, value); |
93f0822d DB |
1378 | return (value >> 40) & 0xFF; |
1379 | } | |
1380 | ||
3bcc6fa9 | 1381 | static int core_get_max_pstate_physical(void) |
93f0822d DB |
1382 | { |
1383 | u64 value; | |
845c1cbe | 1384 | |
05e99c8c | 1385 | rdmsrl(MSR_PLATFORM_INFO, value); |
93f0822d DB |
1386 | return (value >> 8) & 0xFF; |
1387 | } | |
1388 | ||
8fc7554a SP |
1389 | static int core_get_tdp_ratio(u64 plat_info) |
1390 | { | |
1391 | /* Check how many TDP levels present */ | |
1392 | if (plat_info & 0x600000000) { | |
1393 | u64 tdp_ctrl; | |
1394 | u64 tdp_ratio; | |
1395 | int tdp_msr; | |
1396 | int err; | |
1397 | ||
1398 | /* Get the TDP level (0, 1, 2) to get ratios */ | |
1399 | err = rdmsrl_safe(MSR_CONFIG_TDP_CONTROL, &tdp_ctrl); | |
1400 | if (err) | |
1401 | return err; | |
1402 | ||
1403 | /* TDP MSR are continuous starting at 0x648 */ | |
1404 | tdp_msr = MSR_CONFIG_TDP_NOMINAL + (tdp_ctrl & 0x03); | |
1405 | err = rdmsrl_safe(tdp_msr, &tdp_ratio); | |
1406 | if (err) | |
1407 | return err; | |
1408 | ||
1409 | /* For level 1 and 2, bits[23:16] contain the ratio */ | |
1410 | if (tdp_ctrl & 0x03) | |
1411 | tdp_ratio >>= 16; | |
1412 | ||
1413 | tdp_ratio &= 0xff; /* ratios are only 8 bits long */ | |
1414 | pr_debug("tdp_ratio %x\n", (int)tdp_ratio); | |
1415 | ||
1416 | return (int)tdp_ratio; | |
1417 | } | |
1418 | ||
1419 | return -ENXIO; | |
1420 | } | |
1421 | ||
016c8150 | 1422 | static int core_get_max_pstate(void) |
93f0822d | 1423 | { |
6a35fc2d SP |
1424 | u64 tar; |
1425 | u64 plat_info; | |
1426 | int max_pstate; | |
8fc7554a | 1427 | int tdp_ratio; |
6a35fc2d SP |
1428 | int err; |
1429 | ||
1430 | rdmsrl(MSR_PLATFORM_INFO, plat_info); | |
1431 | max_pstate = (plat_info >> 8) & 0xFF; | |
1432 | ||
8fc7554a SP |
1433 | tdp_ratio = core_get_tdp_ratio(plat_info); |
1434 | if (tdp_ratio <= 0) | |
1435 | return max_pstate; | |
1436 | ||
1437 | if (hwp_active) { | |
1438 | /* Turbo activation ratio is not used on HWP platforms */ | |
1439 | return tdp_ratio; | |
1440 | } | |
1441 | ||
6a35fc2d SP |
1442 | err = rdmsrl_safe(MSR_TURBO_ACTIVATION_RATIO, &tar); |
1443 | if (!err) { | |
8fc7554a SP |
1444 | int tar_levels; |
1445 | ||
6a35fc2d | 1446 | /* Do some sanity checking for safety */ |
8fc7554a SP |
1447 | tar_levels = tar & 0xff; |
1448 | if (tdp_ratio - 1 == tar_levels) { | |
1449 | max_pstate = tar_levels; | |
1450 | pr_debug("max_pstate=TAC %x\n", max_pstate); | |
6a35fc2d SP |
1451 | } |
1452 | } | |
845c1cbe | 1453 | |
6a35fc2d | 1454 | return max_pstate; |
93f0822d DB |
1455 | } |
1456 | ||
016c8150 | 1457 | static int core_get_turbo_pstate(void) |
93f0822d DB |
1458 | { |
1459 | u64 value; | |
1460 | int nont, ret; | |
845c1cbe | 1461 | |
100cf6f2 | 1462 | rdmsrl(MSR_TURBO_RATIO_LIMIT, value); |
016c8150 | 1463 | nont = core_get_max_pstate(); |
285cb990 | 1464 | ret = (value) & 255; |
93f0822d DB |
1465 | if (ret <= nont) |
1466 | ret = nont; | |
1467 | return ret; | |
1468 | } | |
1469 | ||
b27580b0 DB |
1470 | static inline int core_get_scaling(void) |
1471 | { | |
1472 | return 100000; | |
1473 | } | |
1474 | ||
fdfdb2b1 | 1475 | static u64 core_get_val(struct cpudata *cpudata, int pstate) |
016c8150 DB |
1476 | { |
1477 | u64 val; | |
1478 | ||
144c8e17 | 1479 | val = (u64)pstate << 8; |
7de32556 | 1480 | if (global.no_turbo && !global.turbo_disabled) |
016c8150 DB |
1481 | val |= (u64)1 << 32; |
1482 | ||
fdfdb2b1 | 1483 | return val; |
016c8150 DB |
1484 | } |
1485 | ||
b34ef932 DC |
1486 | static int knl_get_turbo_pstate(void) |
1487 | { | |
1488 | u64 value; | |
1489 | int nont, ret; | |
1490 | ||
100cf6f2 | 1491 | rdmsrl(MSR_TURBO_RATIO_LIMIT, value); |
b34ef932 DC |
1492 | nont = core_get_max_pstate(); |
1493 | ret = (((value) >> 8) & 0xFF); | |
1494 | if (ret <= nont) | |
1495 | ret = nont; | |
1496 | return ret; | |
1497 | } | |
1498 | ||
b02aabe8 | 1499 | static int intel_pstate_get_base_pstate(struct cpudata *cpu) |
93f0822d | 1500 | { |
b02aabe8 RW |
1501 | return global.no_turbo || global.turbo_disabled ? |
1502 | cpu->pstate.max_pstate : cpu->pstate.turbo_pstate; | |
93f0822d DB |
1503 | } |
1504 | ||
a6c6ead1 | 1505 | static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate) |
fdfdb2b1 | 1506 | { |
bc95a454 RW |
1507 | trace_cpu_frequency(pstate * cpu->pstate.scaling, cpu->cpu); |
1508 | cpu->pstate.current_pstate = pstate; | |
fdfdb2b1 RW |
1509 | /* |
1510 | * Generally, there is no guarantee that this code will always run on | |
1511 | * the CPU being updated, so force the register update to run on the | |
1512 | * right CPU. | |
1513 | */ | |
1514 | wrmsrl_on_cpu(cpu->cpu, MSR_IA32_PERF_CTL, | |
1515 | pstate_funcs.get_val(cpu, pstate)); | |
93f0822d DB |
1516 | } |
1517 | ||
a6c6ead1 RW |
1518 | static void intel_pstate_set_min_pstate(struct cpudata *cpu) |
1519 | { | |
1520 | intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate); | |
1521 | } | |
1522 | ||
1523 | static void intel_pstate_max_within_limits(struct cpudata *cpu) | |
1524 | { | |
b02aabe8 | 1525 | int pstate; |
a6c6ead1 RW |
1526 | |
1527 | update_turbo_state(); | |
b02aabe8 RW |
1528 | pstate = intel_pstate_get_base_pstate(cpu); |
1529 | pstate = max(cpu->pstate.min_pstate, | |
1530 | fp_ext_toint(pstate * cpu->max_perf)); | |
1531 | intel_pstate_set_pstate(cpu, pstate); | |
a6c6ead1 RW |
1532 | } |
1533 | ||
93f0822d DB |
1534 | static void intel_pstate_get_cpu_pstates(struct cpudata *cpu) |
1535 | { | |
016c8150 DB |
1536 | cpu->pstate.min_pstate = pstate_funcs.get_min(); |
1537 | cpu->pstate.max_pstate = pstate_funcs.get_max(); | |
3bcc6fa9 | 1538 | cpu->pstate.max_pstate_physical = pstate_funcs.get_max_physical(); |
016c8150 | 1539 | cpu->pstate.turbo_pstate = pstate_funcs.get_turbo(); |
b27580b0 | 1540 | cpu->pstate.scaling = pstate_funcs.get_scaling(); |
001c76f0 RW |
1541 | cpu->pstate.max_freq = cpu->pstate.max_pstate * cpu->pstate.scaling; |
1542 | cpu->pstate.turbo_freq = cpu->pstate.turbo_pstate * cpu->pstate.scaling; | |
93f0822d | 1543 | |
007bea09 DB |
1544 | if (pstate_funcs.get_vid) |
1545 | pstate_funcs.get_vid(cpu); | |
fdfdb2b1 RW |
1546 | |
1547 | intel_pstate_set_min_pstate(cpu); | |
93f0822d DB |
1548 | } |
1549 | ||
a1c9787d | 1550 | static inline void intel_pstate_calc_avg_perf(struct cpudata *cpu) |
93f0822d | 1551 | { |
6b17ddb2 | 1552 | struct sample *sample = &cpu->sample; |
e66c1768 | 1553 | |
a1c9787d | 1554 | sample->core_avg_perf = div_ext_fp(sample->aperf, sample->mperf); |
93f0822d DB |
1555 | } |
1556 | ||
4fec7ad5 | 1557 | static inline bool intel_pstate_sample(struct cpudata *cpu, u64 time) |
93f0822d | 1558 | { |
93f0822d | 1559 | u64 aperf, mperf; |
4ab60c3f | 1560 | unsigned long flags; |
4055fad3 | 1561 | u64 tsc; |
93f0822d | 1562 | |
4ab60c3f | 1563 | local_irq_save(flags); |
93f0822d DB |
1564 | rdmsrl(MSR_IA32_APERF, aperf); |
1565 | rdmsrl(MSR_IA32_MPERF, mperf); | |
e70eed2b | 1566 | tsc = rdtsc(); |
4fec7ad5 | 1567 | if (cpu->prev_mperf == mperf || cpu->prev_tsc == tsc) { |
8e601a9f | 1568 | local_irq_restore(flags); |
4fec7ad5 | 1569 | return false; |
8e601a9f | 1570 | } |
4ab60c3f | 1571 | local_irq_restore(flags); |
b69880f9 | 1572 | |
c4ee841f | 1573 | cpu->last_sample_time = cpu->sample.time; |
a4675fbc | 1574 | cpu->sample.time = time; |
d37e2b76 DB |
1575 | cpu->sample.aperf = aperf; |
1576 | cpu->sample.mperf = mperf; | |
4055fad3 | 1577 | cpu->sample.tsc = tsc; |
d37e2b76 DB |
1578 | cpu->sample.aperf -= cpu->prev_aperf; |
1579 | cpu->sample.mperf -= cpu->prev_mperf; | |
4055fad3 | 1580 | cpu->sample.tsc -= cpu->prev_tsc; |
1abc4b20 | 1581 | |
93f0822d DB |
1582 | cpu->prev_aperf = aperf; |
1583 | cpu->prev_mperf = mperf; | |
4055fad3 | 1584 | cpu->prev_tsc = tsc; |
febce40f RW |
1585 | /* |
1586 | * First time this function is invoked in a given cycle, all of the | |
1587 | * previous sample data fields are equal to zero or stale and they must | |
1588 | * be populated with meaningful numbers for things to work, so assume | |
1589 | * that sample.time will always be reset before setting the utilization | |
1590 | * update hook and make the caller skip the sample then. | |
1591 | */ | |
eabd22c6 RW |
1592 | if (cpu->last_sample_time) { |
1593 | intel_pstate_calc_avg_perf(cpu); | |
1594 | return true; | |
1595 | } | |
1596 | return false; | |
93f0822d DB |
1597 | } |
1598 | ||
8fa520af PL |
1599 | static inline int32_t get_avg_frequency(struct cpudata *cpu) |
1600 | { | |
a1c9787d RW |
1601 | return mul_ext_fp(cpu->sample.core_avg_perf, |
1602 | cpu->pstate.max_pstate_physical * cpu->pstate.scaling); | |
8fa520af PL |
1603 | } |
1604 | ||
bdcaa23f PL |
1605 | static inline int32_t get_avg_pstate(struct cpudata *cpu) |
1606 | { | |
8edb0a6e RW |
1607 | return mul_ext_fp(cpu->pstate.max_pstate_physical, |
1608 | cpu->sample.core_avg_perf); | |
bdcaa23f PL |
1609 | } |
1610 | ||
e70eed2b PL |
1611 | static inline int32_t get_target_pstate_use_cpu_load(struct cpudata *cpu) |
1612 | { | |
1613 | struct sample *sample = &cpu->sample; | |
09c448d3 | 1614 | int32_t busy_frac, boost; |
0843e83c | 1615 | int target, avg_pstate; |
e70eed2b | 1616 | |
67dd9bf4 RW |
1617 | if (cpu->policy == CPUFREQ_POLICY_PERFORMANCE) |
1618 | return cpu->pstate.turbo_pstate; | |
1619 | ||
09c448d3 | 1620 | busy_frac = div_fp(sample->mperf, sample->tsc); |
63d1d656 | 1621 | |
09c448d3 RW |
1622 | boost = cpu->iowait_boost; |
1623 | cpu->iowait_boost >>= 1; | |
63d1d656 | 1624 | |
09c448d3 RW |
1625 | if (busy_frac < boost) |
1626 | busy_frac = boost; | |
63d1d656 | 1627 | |
09c448d3 | 1628 | sample->busy_scaled = busy_frac * 100; |
0843e83c | 1629 | |
7de32556 | 1630 | target = global.no_turbo || global.turbo_disabled ? |
0843e83c RW |
1631 | cpu->pstate.max_pstate : cpu->pstate.turbo_pstate; |
1632 | target += target >> 2; | |
1633 | target = mul_fp(target, busy_frac); | |
1634 | if (target < cpu->pstate.min_pstate) | |
1635 | target = cpu->pstate.min_pstate; | |
1636 | ||
1637 | /* | |
1638 | * If the average P-state during the previous cycle was higher than the | |
1639 | * current target, add 50% of the difference to the target to reduce | |
1640 | * possible performance oscillations and offset possible performance | |
1641 | * loss related to moving the workload from one CPU to another within | |
1642 | * a package/module. | |
1643 | */ | |
1644 | avg_pstate = get_avg_pstate(cpu); | |
1645 | if (avg_pstate > target) | |
1646 | target += (avg_pstate - target) >> 1; | |
1647 | ||
1648 | return target; | |
e70eed2b PL |
1649 | } |
1650 | ||
157386b6 | 1651 | static inline int32_t get_target_pstate_use_performance(struct cpudata *cpu) |
93f0822d | 1652 | { |
1aa7a6e2 | 1653 | int32_t perf_scaled, max_pstate, current_pstate, sample_ratio; |
a4675fbc | 1654 | u64 duration_ns; |
93f0822d | 1655 | |
67dd9bf4 RW |
1656 | if (cpu->policy == CPUFREQ_POLICY_PERFORMANCE) |
1657 | return cpu->pstate.turbo_pstate; | |
1658 | ||
e0d4c8f8 | 1659 | /* |
f00593a4 RW |
1660 | * perf_scaled is the ratio of the average P-state during the last |
1661 | * sampling period to the P-state requested last time (in percent). | |
1662 | * | |
1663 | * That measures the system's response to the previous P-state | |
1664 | * selection. | |
e0d4c8f8 | 1665 | */ |
22590efb RW |
1666 | max_pstate = cpu->pstate.max_pstate_physical; |
1667 | current_pstate = cpu->pstate.current_pstate; | |
1aa7a6e2 | 1668 | perf_scaled = mul_ext_fp(cpu->sample.core_avg_perf, |
a1c9787d | 1669 | div_fp(100 * max_pstate, current_pstate)); |
c4ee841f | 1670 | |
e0d4c8f8 | 1671 | /* |
a4675fbc RW |
1672 | * Since our utilization update callback will not run unless we are |
1673 | * in C0, check if the actual elapsed time is significantly greater (3x) | |
1674 | * than our sample interval. If it is, then we were idle for a long | |
1aa7a6e2 | 1675 | * enough period of time to adjust our performance metric. |
e0d4c8f8 | 1676 | */ |
a4675fbc | 1677 | duration_ns = cpu->sample.time - cpu->last_sample_time; |
febce40f | 1678 | if ((s64)duration_ns > pid_params.sample_rate_ns * 3) { |
22590efb | 1679 | sample_ratio = div_fp(pid_params.sample_rate_ns, duration_ns); |
1aa7a6e2 | 1680 | perf_scaled = mul_fp(perf_scaled, sample_ratio); |
ffb81056 RW |
1681 | } else { |
1682 | sample_ratio = div_fp(100 * cpu->sample.mperf, cpu->sample.tsc); | |
1683 | if (sample_ratio < int_tofp(1)) | |
1aa7a6e2 | 1684 | perf_scaled = 0; |
c4ee841f DB |
1685 | } |
1686 | ||
1aa7a6e2 RW |
1687 | cpu->sample.busy_scaled = perf_scaled; |
1688 | return cpu->pstate.current_pstate - pid_calc(&cpu->pid, perf_scaled); | |
93f0822d DB |
1689 | } |
1690 | ||
001c76f0 | 1691 | static int intel_pstate_prepare_request(struct cpudata *cpu, int pstate) |
fdfdb2b1 | 1692 | { |
b02aabe8 RW |
1693 | int max_pstate = intel_pstate_get_base_pstate(cpu); |
1694 | int min_pstate; | |
fdfdb2b1 | 1695 | |
b02aabe8 RW |
1696 | min_pstate = max(cpu->pstate.min_pstate, |
1697 | fp_ext_toint(max_pstate * cpu->min_perf)); | |
1698 | max_pstate = max(min_pstate, fp_ext_toint(max_pstate * cpu->max_perf)); | |
1699 | return clamp_t(int, pstate, min_pstate, max_pstate); | |
001c76f0 RW |
1700 | } |
1701 | ||
1702 | static void intel_pstate_update_pstate(struct cpudata *cpu, int pstate) | |
1703 | { | |
fdfdb2b1 RW |
1704 | if (pstate == cpu->pstate.current_pstate) |
1705 | return; | |
1706 | ||
bc95a454 | 1707 | cpu->pstate.current_pstate = pstate; |
fdfdb2b1 RW |
1708 | wrmsrl(MSR_IA32_PERF_CTL, pstate_funcs.get_val(cpu, pstate)); |
1709 | } | |
1710 | ||
67dd9bf4 | 1711 | static void intel_pstate_adjust_pstate(struct cpudata *cpu, int target_pstate) |
93f0822d | 1712 | { |
67dd9bf4 | 1713 | int from = cpu->pstate.current_pstate; |
4055fad3 DS |
1714 | struct sample *sample; |
1715 | ||
001c76f0 RW |
1716 | update_turbo_state(); |
1717 | ||
64078299 RW |
1718 | target_pstate = intel_pstate_prepare_request(cpu, target_pstate); |
1719 | trace_cpu_frequency(target_pstate * cpu->pstate.scaling, cpu->cpu); | |
fdfdb2b1 | 1720 | intel_pstate_update_pstate(cpu, target_pstate); |
4055fad3 DS |
1721 | |
1722 | sample = &cpu->sample; | |
a1c9787d | 1723 | trace_pstate_sample(mul_ext_fp(100, sample->core_avg_perf), |
157386b6 | 1724 | fp_toint(sample->busy_scaled), |
4055fad3 DS |
1725 | from, |
1726 | cpu->pstate.current_pstate, | |
1727 | sample->mperf, | |
1728 | sample->aperf, | |
1729 | sample->tsc, | |
3ba7bcaa SP |
1730 | get_avg_frequency(cpu), |
1731 | fp_toint(cpu->iowait_boost * 100)); | |
93f0822d DB |
1732 | } |
1733 | ||
eabd22c6 RW |
1734 | static void intel_pstate_update_util_hwp(struct update_util_data *data, |
1735 | u64 time, unsigned int flags) | |
1736 | { | |
1737 | struct cpudata *cpu = container_of(data, struct cpudata, update_util); | |
1738 | u64 delta_ns = time - cpu->sample.time; | |
1739 | ||
1740 | if ((s64)delta_ns >= INTEL_PSTATE_HWP_SAMPLING_INTERVAL) | |
1741 | intel_pstate_sample(cpu, time); | |
1742 | } | |
1743 | ||
1744 | static void intel_pstate_update_util_pid(struct update_util_data *data, | |
1745 | u64 time, unsigned int flags) | |
1746 | { | |
1747 | struct cpudata *cpu = container_of(data, struct cpudata, update_util); | |
1748 | u64 delta_ns = time - cpu->sample.time; | |
1749 | ||
1750 | if ((s64)delta_ns < pid_params.sample_rate_ns) | |
1751 | return; | |
1752 | ||
67dd9bf4 RW |
1753 | if (intel_pstate_sample(cpu, time)) { |
1754 | int target_pstate; | |
1755 | ||
1756 | target_pstate = get_target_pstate_use_performance(cpu); | |
1757 | intel_pstate_adjust_pstate(cpu, target_pstate); | |
1758 | } | |
eabd22c6 RW |
1759 | } |
1760 | ||
a4675fbc | 1761 | static void intel_pstate_update_util(struct update_util_data *data, u64 time, |
58919e83 | 1762 | unsigned int flags) |
93f0822d | 1763 | { |
a4675fbc | 1764 | struct cpudata *cpu = container_of(data, struct cpudata, update_util); |
09c448d3 RW |
1765 | u64 delta_ns; |
1766 | ||
eabd22c6 RW |
1767 | if (flags & SCHED_CPUFREQ_IOWAIT) { |
1768 | cpu->iowait_boost = int_tofp(1); | |
1769 | } else if (cpu->iowait_boost) { | |
1770 | /* Clear iowait_boost if the CPU may have been idle. */ | |
1771 | delta_ns = time - cpu->last_update; | |
1772 | if (delta_ns > TICK_NSEC) | |
1773 | cpu->iowait_boost = 0; | |
09c448d3 | 1774 | } |
eabd22c6 | 1775 | cpu->last_update = time; |
09c448d3 | 1776 | delta_ns = time - cpu->sample.time; |
eabd22c6 RW |
1777 | if ((s64)delta_ns < INTEL_PSTATE_DEFAULT_SAMPLING_INTERVAL) |
1778 | return; | |
4fec7ad5 | 1779 | |
67dd9bf4 RW |
1780 | if (intel_pstate_sample(cpu, time)) { |
1781 | int target_pstate; | |
93f0822d | 1782 | |
67dd9bf4 RW |
1783 | target_pstate = get_target_pstate_use_cpu_load(cpu); |
1784 | intel_pstate_adjust_pstate(cpu, target_pstate); | |
1785 | } | |
1786 | } | |
eabd22c6 | 1787 | |
2f49afc2 RW |
1788 | static struct pstate_funcs core_funcs = { |
1789 | .get_max = core_get_max_pstate, | |
1790 | .get_max_physical = core_get_max_pstate_physical, | |
1791 | .get_min = core_get_min_pstate, | |
1792 | .get_turbo = core_get_turbo_pstate, | |
1793 | .get_scaling = core_get_scaling, | |
1794 | .get_val = core_get_val, | |
1795 | .update_util = intel_pstate_update_util_pid, | |
de4a76cb RW |
1796 | }; |
1797 | ||
2f49afc2 RW |
1798 | static const struct pstate_funcs silvermont_funcs = { |
1799 | .get_max = atom_get_max_pstate, | |
1800 | .get_max_physical = atom_get_max_pstate, | |
1801 | .get_min = atom_get_min_pstate, | |
1802 | .get_turbo = atom_get_turbo_pstate, | |
1803 | .get_val = atom_get_val, | |
1804 | .get_scaling = silvermont_get_scaling, | |
1805 | .get_vid = atom_get_vid, | |
1806 | .update_util = intel_pstate_update_util, | |
de4a76cb RW |
1807 | }; |
1808 | ||
2f49afc2 RW |
1809 | static const struct pstate_funcs airmont_funcs = { |
1810 | .get_max = atom_get_max_pstate, | |
1811 | .get_max_physical = atom_get_max_pstate, | |
1812 | .get_min = atom_get_min_pstate, | |
1813 | .get_turbo = atom_get_turbo_pstate, | |
1814 | .get_val = atom_get_val, | |
1815 | .get_scaling = airmont_get_scaling, | |
1816 | .get_vid = atom_get_vid, | |
1817 | .update_util = intel_pstate_update_util, | |
de4a76cb RW |
1818 | }; |
1819 | ||
2f49afc2 RW |
1820 | static const struct pstate_funcs knl_funcs = { |
1821 | .get_max = core_get_max_pstate, | |
1822 | .get_max_physical = core_get_max_pstate_physical, | |
1823 | .get_min = core_get_min_pstate, | |
1824 | .get_turbo = knl_get_turbo_pstate, | |
1825 | .get_scaling = core_get_scaling, | |
1826 | .get_val = core_get_val, | |
1827 | .update_util = intel_pstate_update_util_pid, | |
de4a76cb RW |
1828 | }; |
1829 | ||
2f49afc2 RW |
1830 | static const struct pstate_funcs bxt_funcs = { |
1831 | .get_max = core_get_max_pstate, | |
1832 | .get_max_physical = core_get_max_pstate_physical, | |
1833 | .get_min = core_get_min_pstate, | |
1834 | .get_turbo = core_get_turbo_pstate, | |
1835 | .get_scaling = core_get_scaling, | |
1836 | .get_val = core_get_val, | |
1837 | .update_util = intel_pstate_update_util, | |
de4a76cb RW |
1838 | }; |
1839 | ||
93f0822d | 1840 | #define ICPU(model, policy) \ |
6cbd7ee1 DB |
1841 | { X86_VENDOR_INTEL, 6, model, X86_FEATURE_APERFMPERF,\ |
1842 | (unsigned long)&policy } | |
93f0822d DB |
1843 | |
1844 | static const struct x86_cpu_id intel_pstate_cpu_ids[] = { | |
2f49afc2 RW |
1845 | ICPU(INTEL_FAM6_SANDYBRIDGE, core_funcs), |
1846 | ICPU(INTEL_FAM6_SANDYBRIDGE_X, core_funcs), | |
1847 | ICPU(INTEL_FAM6_ATOM_SILVERMONT1, silvermont_funcs), | |
1848 | ICPU(INTEL_FAM6_IVYBRIDGE, core_funcs), | |
1849 | ICPU(INTEL_FAM6_HASWELL_CORE, core_funcs), | |
1850 | ICPU(INTEL_FAM6_BROADWELL_CORE, core_funcs), | |
1851 | ICPU(INTEL_FAM6_IVYBRIDGE_X, core_funcs), | |
1852 | ICPU(INTEL_FAM6_HASWELL_X, core_funcs), | |
1853 | ICPU(INTEL_FAM6_HASWELL_ULT, core_funcs), | |
1854 | ICPU(INTEL_FAM6_HASWELL_GT3E, core_funcs), | |
1855 | ICPU(INTEL_FAM6_BROADWELL_GT3E, core_funcs), | |
1856 | ICPU(INTEL_FAM6_ATOM_AIRMONT, airmont_funcs), | |
1857 | ICPU(INTEL_FAM6_SKYLAKE_MOBILE, core_funcs), | |
1858 | ICPU(INTEL_FAM6_BROADWELL_X, core_funcs), | |
1859 | ICPU(INTEL_FAM6_SKYLAKE_DESKTOP, core_funcs), | |
1860 | ICPU(INTEL_FAM6_BROADWELL_XEON_D, core_funcs), | |
1861 | ICPU(INTEL_FAM6_XEON_PHI_KNL, knl_funcs), | |
1862 | ICPU(INTEL_FAM6_XEON_PHI_KNM, knl_funcs), | |
1863 | ICPU(INTEL_FAM6_ATOM_GOLDMONT, bxt_funcs), | |
93f0822d DB |
1864 | {} |
1865 | }; | |
1866 | MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids); | |
1867 | ||
29327c84 | 1868 | static const struct x86_cpu_id intel_pstate_cpu_oob_ids[] __initconst = { |
2f49afc2 RW |
1869 | ICPU(INTEL_FAM6_BROADWELL_XEON_D, core_funcs), |
1870 | ICPU(INTEL_FAM6_BROADWELL_X, core_funcs), | |
1871 | ICPU(INTEL_FAM6_SKYLAKE_X, core_funcs), | |
2f86dc4c DB |
1872 | {} |
1873 | }; | |
1874 | ||
6e978b22 | 1875 | static const struct x86_cpu_id intel_pstate_cpu_ee_disable_ids[] = { |
2f49afc2 | 1876 | ICPU(INTEL_FAM6_KABYLAKE_DESKTOP, core_funcs), |
6e978b22 SP |
1877 | {} |
1878 | }; | |
1879 | ||
8ca6ce37 RW |
1880 | static bool pid_in_use(void); |
1881 | ||
93f0822d DB |
1882 | static int intel_pstate_init_cpu(unsigned int cpunum) |
1883 | { | |
93f0822d DB |
1884 | struct cpudata *cpu; |
1885 | ||
eae48f04 SP |
1886 | cpu = all_cpu_data[cpunum]; |
1887 | ||
1888 | if (!cpu) { | |
c5a2ee7d | 1889 | cpu = kzalloc(sizeof(*cpu), GFP_KERNEL); |
eae48f04 SP |
1890 | if (!cpu) |
1891 | return -ENOMEM; | |
1892 | ||
1893 | all_cpu_data[cpunum] = cpu; | |
eae48f04 | 1894 | |
984edbdc SP |
1895 | cpu->epp_default = -EINVAL; |
1896 | cpu->epp_powersave = -EINVAL; | |
1897 | cpu->epp_saved = -EINVAL; | |
eae48f04 | 1898 | } |
93f0822d DB |
1899 | |
1900 | cpu = all_cpu_data[cpunum]; | |
1901 | ||
93f0822d | 1902 | cpu->cpu = cpunum; |
ba88d433 | 1903 | |
a4675fbc | 1904 | if (hwp_active) { |
6e978b22 SP |
1905 | const struct x86_cpu_id *id; |
1906 | ||
1907 | id = x86_match_cpu(intel_pstate_cpu_ee_disable_ids); | |
1908 | if (id) | |
1909 | intel_pstate_disable_ee(cpunum); | |
1910 | ||
ba88d433 | 1911 | intel_pstate_hwp_enable(cpu); |
8ca6ce37 | 1912 | } else if (pid_in_use()) { |
694cb173 | 1913 | intel_pstate_pid_reset(cpu); |
a4675fbc | 1914 | } |
ba88d433 | 1915 | |
179e8471 | 1916 | intel_pstate_get_cpu_pstates(cpu); |
016c8150 | 1917 | |
4836df17 | 1918 | pr_debug("controlling: cpu %d\n", cpunum); |
93f0822d DB |
1919 | |
1920 | return 0; | |
1921 | } | |
1922 | ||
1923 | static unsigned int intel_pstate_get(unsigned int cpu_num) | |
1924 | { | |
f96fd0c8 | 1925 | struct cpudata *cpu = all_cpu_data[cpu_num]; |
93f0822d | 1926 | |
f96fd0c8 | 1927 | return cpu ? get_avg_frequency(cpu) : 0; |
93f0822d DB |
1928 | } |
1929 | ||
febce40f | 1930 | static void intel_pstate_set_update_util_hook(unsigned int cpu_num) |
bb6ab52f | 1931 | { |
febce40f RW |
1932 | struct cpudata *cpu = all_cpu_data[cpu_num]; |
1933 | ||
5ab666e0 RW |
1934 | if (cpu->update_util_set) |
1935 | return; | |
1936 | ||
febce40f RW |
1937 | /* Prevent intel_pstate_update_util() from using stale data. */ |
1938 | cpu->sample.time = 0; | |
67dd9bf4 RW |
1939 | cpufreq_add_update_util_hook(cpu_num, &cpu->update_util, |
1940 | pstate_funcs.update_util); | |
4578ee7e | 1941 | cpu->update_util_set = true; |
bb6ab52f RW |
1942 | } |
1943 | ||
1944 | static void intel_pstate_clear_update_util_hook(unsigned int cpu) | |
1945 | { | |
4578ee7e CY |
1946 | struct cpudata *cpu_data = all_cpu_data[cpu]; |
1947 | ||
1948 | if (!cpu_data->update_util_set) | |
1949 | return; | |
1950 | ||
0bed612b | 1951 | cpufreq_remove_update_util_hook(cpu); |
4578ee7e | 1952 | cpu_data->update_util_set = false; |
bb6ab52f RW |
1953 | synchronize_sched(); |
1954 | } | |
1955 | ||
80b120ca RW |
1956 | static int intel_pstate_get_max_freq(struct cpudata *cpu) |
1957 | { | |
1958 | return global.turbo_disabled || global.no_turbo ? | |
1959 | cpu->pstate.max_freq : cpu->pstate.turbo_freq; | |
1960 | } | |
1961 | ||
eae48f04 | 1962 | static void intel_pstate_update_perf_limits(struct cpufreq_policy *policy, |
c5a2ee7d | 1963 | struct cpudata *cpu) |
eae48f04 | 1964 | { |
80b120ca | 1965 | int max_freq = intel_pstate_get_max_freq(cpu); |
e4c204ce | 1966 | int32_t max_policy_perf, min_policy_perf; |
a410c03d | 1967 | |
80b120ca | 1968 | max_policy_perf = div_ext_fp(policy->max, max_freq); |
e4c204ce | 1969 | max_policy_perf = clamp_t(int32_t, max_policy_perf, 0, int_ext_tofp(1)); |
5879f877 | 1970 | if (policy->max == policy->min) { |
e4c204ce | 1971 | min_policy_perf = max_policy_perf; |
5879f877 | 1972 | } else { |
80b120ca | 1973 | min_policy_perf = div_ext_fp(policy->min, max_freq); |
e4c204ce RW |
1974 | min_policy_perf = clamp_t(int32_t, min_policy_perf, |
1975 | 0, max_policy_perf); | |
5879f877 | 1976 | } |
eae48f04 | 1977 | |
e4c204ce | 1978 | /* Normalize user input to [min_perf, max_perf] */ |
c5a2ee7d | 1979 | if (per_cpu_limits) { |
e14cf885 RW |
1980 | cpu->min_perf = min_policy_perf; |
1981 | cpu->max_perf = max_policy_perf; | |
c5a2ee7d RW |
1982 | } else { |
1983 | int32_t global_min, global_max; | |
1984 | ||
1985 | /* Global limits are in percent of the maximum turbo P-state. */ | |
1986 | global_max = percent_ext_fp(global.max_perf_pct); | |
1987 | global_min = percent_ext_fp(global.min_perf_pct); | |
80b120ca | 1988 | if (max_freq != cpu->pstate.turbo_freq) { |
c5a2ee7d RW |
1989 | int32_t turbo_factor; |
1990 | ||
1991 | turbo_factor = div_ext_fp(cpu->pstate.turbo_pstate, | |
1992 | cpu->pstate.max_pstate); | |
1993 | global_min = mul_ext_fp(global_min, turbo_factor); | |
1994 | global_max = mul_ext_fp(global_max, turbo_factor); | |
1995 | } | |
1996 | global_min = clamp_t(int32_t, global_min, 0, global_max); | |
eae48f04 | 1997 | |
e14cf885 RW |
1998 | cpu->min_perf = max(min_policy_perf, global_min); |
1999 | cpu->min_perf = min(cpu->min_perf, max_policy_perf); | |
2000 | cpu->max_perf = min(max_policy_perf, global_max); | |
2001 | cpu->max_perf = max(min_policy_perf, cpu->max_perf); | |
c5a2ee7d RW |
2002 | |
2003 | /* Make sure min_perf <= max_perf */ | |
e14cf885 | 2004 | cpu->min_perf = min(cpu->min_perf, cpu->max_perf); |
c5a2ee7d | 2005 | } |
eae48f04 | 2006 | |
e14cf885 RW |
2007 | cpu->max_perf = round_up(cpu->max_perf, EXT_FRAC_BITS); |
2008 | cpu->min_perf = round_up(cpu->min_perf, EXT_FRAC_BITS); | |
eae48f04 SP |
2009 | |
2010 | pr_debug("cpu:%d max_perf_pct:%d min_perf_pct:%d\n", policy->cpu, | |
e14cf885 RW |
2011 | fp_ext_toint(cpu->max_perf * 100), |
2012 | fp_ext_toint(cpu->min_perf * 100)); | |
eae48f04 SP |
2013 | } |
2014 | ||
93f0822d DB |
2015 | static int intel_pstate_set_policy(struct cpufreq_policy *policy) |
2016 | { | |
3be9200d SP |
2017 | struct cpudata *cpu; |
2018 | ||
d3929b83 DB |
2019 | if (!policy->cpuinfo.max_freq) |
2020 | return -ENODEV; | |
2021 | ||
2c2c1af4 SP |
2022 | pr_debug("set_policy cpuinfo.max %u policy->max %u\n", |
2023 | policy->cpuinfo.max_freq, policy->max); | |
2024 | ||
a6c6ead1 | 2025 | cpu = all_cpu_data[policy->cpu]; |
2f1d407a RW |
2026 | cpu->policy = policy->policy; |
2027 | ||
b59fe540 SP |
2028 | mutex_lock(&intel_pstate_limits_lock); |
2029 | ||
c5a2ee7d | 2030 | intel_pstate_update_perf_limits(policy, cpu); |
a240c4aa | 2031 | |
2f1d407a | 2032 | if (cpu->policy == CPUFREQ_POLICY_PERFORMANCE) { |
a6c6ead1 RW |
2033 | /* |
2034 | * NOHZ_FULL CPUs need this as the governor callback may not | |
2035 | * be invoked on them. | |
2036 | */ | |
2037 | intel_pstate_clear_update_util_hook(policy->cpu); | |
2038 | intel_pstate_max_within_limits(cpu); | |
2039 | } | |
2040 | ||
bb6ab52f RW |
2041 | intel_pstate_set_update_util_hook(policy->cpu); |
2042 | ||
5f98ced1 | 2043 | if (hwp_active) |
2bfc4cbb | 2044 | intel_pstate_hwp_set(policy->cpu); |
2f86dc4c | 2045 | |
b59fe540 SP |
2046 | mutex_unlock(&intel_pstate_limits_lock); |
2047 | ||
93f0822d DB |
2048 | return 0; |
2049 | } | |
2050 | ||
80b120ca RW |
2051 | static void intel_pstate_adjust_policy_max(struct cpufreq_policy *policy, |
2052 | struct cpudata *cpu) | |
2053 | { | |
2054 | if (cpu->pstate.max_pstate_physical > cpu->pstate.max_pstate && | |
2055 | policy->max < policy->cpuinfo.max_freq && | |
2056 | policy->max > cpu->pstate.max_freq) { | |
2057 | pr_debug("policy->max > max non turbo frequency\n"); | |
2058 | policy->max = policy->cpuinfo.max_freq; | |
2059 | } | |
2060 | } | |
2061 | ||
93f0822d DB |
2062 | static int intel_pstate_verify_policy(struct cpufreq_policy *policy) |
2063 | { | |
7d9a8a9f | 2064 | struct cpudata *cpu = all_cpu_data[policy->cpu]; |
7d9a8a9f SP |
2065 | |
2066 | update_turbo_state(); | |
80b120ca RW |
2067 | cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, |
2068 | intel_pstate_get_max_freq(cpu)); | |
93f0822d | 2069 | |
285cb990 | 2070 | if (policy->policy != CPUFREQ_POLICY_POWERSAVE && |
c410833a | 2071 | policy->policy != CPUFREQ_POLICY_PERFORMANCE) |
93f0822d DB |
2072 | return -EINVAL; |
2073 | ||
80b120ca RW |
2074 | intel_pstate_adjust_policy_max(policy, cpu); |
2075 | ||
93f0822d DB |
2076 | return 0; |
2077 | } | |
2078 | ||
001c76f0 RW |
2079 | static void intel_cpufreq_stop_cpu(struct cpufreq_policy *policy) |
2080 | { | |
2081 | intel_pstate_set_min_pstate(all_cpu_data[policy->cpu]); | |
2082 | } | |
2083 | ||
bb18008f | 2084 | static void intel_pstate_stop_cpu(struct cpufreq_policy *policy) |
93f0822d | 2085 | { |
001c76f0 | 2086 | pr_debug("CPU %d exiting\n", policy->cpu); |
93f0822d | 2087 | |
001c76f0 | 2088 | intel_pstate_clear_update_util_hook(policy->cpu); |
984edbdc SP |
2089 | if (hwp_active) |
2090 | intel_pstate_hwp_save_state(policy); | |
2091 | else | |
001c76f0 RW |
2092 | intel_cpufreq_stop_cpu(policy); |
2093 | } | |
bb18008f | 2094 | |
001c76f0 RW |
2095 | static int intel_pstate_cpu_exit(struct cpufreq_policy *policy) |
2096 | { | |
2097 | intel_pstate_exit_perf_limits(policy); | |
a4675fbc | 2098 | |
001c76f0 | 2099 | policy->fast_switch_possible = false; |
2f86dc4c | 2100 | |
001c76f0 | 2101 | return 0; |
93f0822d DB |
2102 | } |
2103 | ||
001c76f0 | 2104 | static int __intel_pstate_cpu_init(struct cpufreq_policy *policy) |
93f0822d | 2105 | { |
93f0822d | 2106 | struct cpudata *cpu; |
52e0a509 | 2107 | int rc; |
93f0822d DB |
2108 | |
2109 | rc = intel_pstate_init_cpu(policy->cpu); | |
2110 | if (rc) | |
2111 | return rc; | |
2112 | ||
2113 | cpu = all_cpu_data[policy->cpu]; | |
2114 | ||
e14cf885 RW |
2115 | cpu->max_perf = int_ext_tofp(1); |
2116 | cpu->min_perf = 0; | |
93f0822d | 2117 | |
b27580b0 DB |
2118 | policy->min = cpu->pstate.min_pstate * cpu->pstate.scaling; |
2119 | policy->max = cpu->pstate.turbo_pstate * cpu->pstate.scaling; | |
93f0822d DB |
2120 | |
2121 | /* cpuinfo and default policy values */ | |
b27580b0 | 2122 | policy->cpuinfo.min_freq = cpu->pstate.min_pstate * cpu->pstate.scaling; |
983e600e | 2123 | update_turbo_state(); |
7de32556 | 2124 | policy->cpuinfo.max_freq = global.turbo_disabled ? |
983e600e SP |
2125 | cpu->pstate.max_pstate : cpu->pstate.turbo_pstate; |
2126 | policy->cpuinfo.max_freq *= cpu->pstate.scaling; | |
2127 | ||
9522a2ff | 2128 | intel_pstate_init_acpi_perf_limits(policy); |
93f0822d DB |
2129 | cpumask_set_cpu(policy->cpu, policy->cpus); |
2130 | ||
001c76f0 RW |
2131 | policy->fast_switch_possible = true; |
2132 | ||
93f0822d DB |
2133 | return 0; |
2134 | } | |
2135 | ||
001c76f0 | 2136 | static int intel_pstate_cpu_init(struct cpufreq_policy *policy) |
9522a2ff | 2137 | { |
001c76f0 RW |
2138 | int ret = __intel_pstate_cpu_init(policy); |
2139 | ||
2140 | if (ret) | |
2141 | return ret; | |
2142 | ||
2143 | policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL; | |
7de32556 | 2144 | if (IS_ENABLED(CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE)) |
001c76f0 RW |
2145 | policy->policy = CPUFREQ_POLICY_PERFORMANCE; |
2146 | else | |
2147 | policy->policy = CPUFREQ_POLICY_POWERSAVE; | |
9522a2ff SP |
2148 | |
2149 | return 0; | |
2150 | } | |
2151 | ||
001c76f0 | 2152 | static struct cpufreq_driver intel_pstate = { |
93f0822d DB |
2153 | .flags = CPUFREQ_CONST_LOOPS, |
2154 | .verify = intel_pstate_verify_policy, | |
2155 | .setpolicy = intel_pstate_set_policy, | |
984edbdc | 2156 | .suspend = intel_pstate_hwp_save_state, |
8442885f | 2157 | .resume = intel_pstate_resume, |
93f0822d DB |
2158 | .get = intel_pstate_get, |
2159 | .init = intel_pstate_cpu_init, | |
9522a2ff | 2160 | .exit = intel_pstate_cpu_exit, |
bb18008f | 2161 | .stop_cpu = intel_pstate_stop_cpu, |
93f0822d | 2162 | .name = "intel_pstate", |
93f0822d DB |
2163 | }; |
2164 | ||
001c76f0 RW |
2165 | static int intel_cpufreq_verify_policy(struct cpufreq_policy *policy) |
2166 | { | |
2167 | struct cpudata *cpu = all_cpu_data[policy->cpu]; | |
001c76f0 RW |
2168 | |
2169 | update_turbo_state(); | |
80b120ca RW |
2170 | cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, |
2171 | intel_pstate_get_max_freq(cpu)); | |
001c76f0 | 2172 | |
80b120ca | 2173 | intel_pstate_adjust_policy_max(policy, cpu); |
001c76f0 | 2174 | |
c5a2ee7d RW |
2175 | intel_pstate_update_perf_limits(policy, cpu); |
2176 | ||
001c76f0 RW |
2177 | return 0; |
2178 | } | |
2179 | ||
001c76f0 RW |
2180 | static int intel_cpufreq_target(struct cpufreq_policy *policy, |
2181 | unsigned int target_freq, | |
2182 | unsigned int relation) | |
2183 | { | |
2184 | struct cpudata *cpu = all_cpu_data[policy->cpu]; | |
2185 | struct cpufreq_freqs freqs; | |
2186 | int target_pstate; | |
2187 | ||
64897b20 RW |
2188 | update_turbo_state(); |
2189 | ||
001c76f0 | 2190 | freqs.old = policy->cur; |
64897b20 | 2191 | freqs.new = target_freq; |
001c76f0 RW |
2192 | |
2193 | cpufreq_freq_transition_begin(policy, &freqs); | |
2194 | switch (relation) { | |
2195 | case CPUFREQ_RELATION_L: | |
2196 | target_pstate = DIV_ROUND_UP(freqs.new, cpu->pstate.scaling); | |
2197 | break; | |
2198 | case CPUFREQ_RELATION_H: | |
2199 | target_pstate = freqs.new / cpu->pstate.scaling; | |
2200 | break; | |
2201 | default: | |
2202 | target_pstate = DIV_ROUND_CLOSEST(freqs.new, cpu->pstate.scaling); | |
2203 | break; | |
2204 | } | |
2205 | target_pstate = intel_pstate_prepare_request(cpu, target_pstate); | |
2206 | if (target_pstate != cpu->pstate.current_pstate) { | |
2207 | cpu->pstate.current_pstate = target_pstate; | |
2208 | wrmsrl_on_cpu(policy->cpu, MSR_IA32_PERF_CTL, | |
2209 | pstate_funcs.get_val(cpu, target_pstate)); | |
2210 | } | |
64078299 | 2211 | freqs.new = target_pstate * cpu->pstate.scaling; |
001c76f0 RW |
2212 | cpufreq_freq_transition_end(policy, &freqs, false); |
2213 | ||
2214 | return 0; | |
2215 | } | |
2216 | ||
2217 | static unsigned int intel_cpufreq_fast_switch(struct cpufreq_policy *policy, | |
2218 | unsigned int target_freq) | |
2219 | { | |
2220 | struct cpudata *cpu = all_cpu_data[policy->cpu]; | |
2221 | int target_pstate; | |
2222 | ||
64897b20 RW |
2223 | update_turbo_state(); |
2224 | ||
001c76f0 | 2225 | target_pstate = DIV_ROUND_UP(target_freq, cpu->pstate.scaling); |
64078299 | 2226 | target_pstate = intel_pstate_prepare_request(cpu, target_pstate); |
001c76f0 | 2227 | intel_pstate_update_pstate(cpu, target_pstate); |
64078299 | 2228 | return target_pstate * cpu->pstate.scaling; |
001c76f0 RW |
2229 | } |
2230 | ||
2231 | static int intel_cpufreq_cpu_init(struct cpufreq_policy *policy) | |
2232 | { | |
2233 | int ret = __intel_pstate_cpu_init(policy); | |
2234 | ||
2235 | if (ret) | |
2236 | return ret; | |
2237 | ||
2238 | policy->cpuinfo.transition_latency = INTEL_CPUFREQ_TRANSITION_LATENCY; | |
2239 | /* This reflects the intel_pstate_get_cpu_pstates() setting. */ | |
2240 | policy->cur = policy->cpuinfo.min_freq; | |
2241 | ||
2242 | return 0; | |
2243 | } | |
2244 | ||
2245 | static struct cpufreq_driver intel_cpufreq = { | |
2246 | .flags = CPUFREQ_CONST_LOOPS, | |
2247 | .verify = intel_cpufreq_verify_policy, | |
2248 | .target = intel_cpufreq_target, | |
2249 | .fast_switch = intel_cpufreq_fast_switch, | |
2250 | .init = intel_cpufreq_cpu_init, | |
2251 | .exit = intel_pstate_cpu_exit, | |
2252 | .stop_cpu = intel_cpufreq_stop_cpu, | |
2253 | .name = "intel_cpufreq", | |
2254 | }; | |
2255 | ||
ee8df89a | 2256 | static struct cpufreq_driver *default_driver = &intel_pstate; |
001c76f0 | 2257 | |
8ca6ce37 RW |
2258 | static bool pid_in_use(void) |
2259 | { | |
2260 | return intel_pstate_driver == &intel_pstate && | |
2261 | pstate_funcs.update_util == intel_pstate_update_util_pid; | |
2262 | } | |
2263 | ||
fb1fe104 RW |
2264 | static void intel_pstate_driver_cleanup(void) |
2265 | { | |
2266 | unsigned int cpu; | |
2267 | ||
2268 | get_online_cpus(); | |
2269 | for_each_online_cpu(cpu) { | |
2270 | if (all_cpu_data[cpu]) { | |
2271 | if (intel_pstate_driver == &intel_pstate) | |
2272 | intel_pstate_clear_update_util_hook(cpu); | |
2273 | ||
2274 | kfree(all_cpu_data[cpu]); | |
2275 | all_cpu_data[cpu] = NULL; | |
2276 | } | |
2277 | } | |
2278 | put_online_cpus(); | |
ee8df89a | 2279 | intel_pstate_driver = NULL; |
fb1fe104 RW |
2280 | } |
2281 | ||
ee8df89a | 2282 | static int intel_pstate_register_driver(struct cpufreq_driver *driver) |
fb1fe104 RW |
2283 | { |
2284 | int ret; | |
2285 | ||
c5a2ee7d RW |
2286 | memset(&global, 0, sizeof(global)); |
2287 | global.max_perf_pct = 100; | |
c3a49c89 | 2288 | |
ee8df89a | 2289 | intel_pstate_driver = driver; |
fb1fe104 RW |
2290 | ret = cpufreq_register_driver(intel_pstate_driver); |
2291 | if (ret) { | |
2292 | intel_pstate_driver_cleanup(); | |
2293 | return ret; | |
2294 | } | |
2295 | ||
c5a2ee7d RW |
2296 | global.min_perf_pct = min_perf_pct_min(); |
2297 | ||
8ca6ce37 | 2298 | if (pid_in_use()) |
fb1fe104 RW |
2299 | intel_pstate_debug_expose_params(); |
2300 | ||
2301 | return 0; | |
2302 | } | |
2303 | ||
2304 | static int intel_pstate_unregister_driver(void) | |
2305 | { | |
2306 | if (hwp_active) | |
2307 | return -EBUSY; | |
2308 | ||
8ca6ce37 | 2309 | if (pid_in_use()) |
fb1fe104 RW |
2310 | intel_pstate_debug_hide_params(); |
2311 | ||
fb1fe104 RW |
2312 | cpufreq_unregister_driver(intel_pstate_driver); |
2313 | intel_pstate_driver_cleanup(); | |
2314 | ||
2315 | return 0; | |
2316 | } | |
2317 | ||
2318 | static ssize_t intel_pstate_show_status(char *buf) | |
2319 | { | |
ee8df89a | 2320 | if (!intel_pstate_driver) |
fb1fe104 RW |
2321 | return sprintf(buf, "off\n"); |
2322 | ||
2323 | return sprintf(buf, "%s\n", intel_pstate_driver == &intel_pstate ? | |
2324 | "active" : "passive"); | |
2325 | } | |
2326 | ||
2327 | static int intel_pstate_update_status(const char *buf, size_t size) | |
2328 | { | |
2329 | int ret; | |
2330 | ||
2331 | if (size == 3 && !strncmp(buf, "off", size)) | |
ee8df89a | 2332 | return intel_pstate_driver ? |
fb1fe104 RW |
2333 | intel_pstate_unregister_driver() : -EINVAL; |
2334 | ||
2335 | if (size == 6 && !strncmp(buf, "active", size)) { | |
ee8df89a | 2336 | if (intel_pstate_driver) { |
fb1fe104 RW |
2337 | if (intel_pstate_driver == &intel_pstate) |
2338 | return 0; | |
2339 | ||
2340 | ret = intel_pstate_unregister_driver(); | |
2341 | if (ret) | |
2342 | return ret; | |
2343 | } | |
2344 | ||
ee8df89a | 2345 | return intel_pstate_register_driver(&intel_pstate); |
fb1fe104 RW |
2346 | } |
2347 | ||
2348 | if (size == 7 && !strncmp(buf, "passive", size)) { | |
ee8df89a | 2349 | if (intel_pstate_driver) { |
0042b2c0 | 2350 | if (intel_pstate_driver == &intel_cpufreq) |
fb1fe104 RW |
2351 | return 0; |
2352 | ||
2353 | ret = intel_pstate_unregister_driver(); | |
2354 | if (ret) | |
2355 | return ret; | |
2356 | } | |
2357 | ||
ee8df89a | 2358 | return intel_pstate_register_driver(&intel_cpufreq); |
fb1fe104 RW |
2359 | } |
2360 | ||
2361 | return -EINVAL; | |
2362 | } | |
2363 | ||
eed43609 JZ |
2364 | static int no_load __initdata; |
2365 | static int no_hwp __initdata; | |
2366 | static int hwp_only __initdata; | |
29327c84 | 2367 | static unsigned int force_load __initdata; |
6be26498 | 2368 | |
29327c84 | 2369 | static int __init intel_pstate_msrs_not_valid(void) |
b563b4e3 | 2370 | { |
016c8150 | 2371 | if (!pstate_funcs.get_max() || |
c410833a SK |
2372 | !pstate_funcs.get_min() || |
2373 | !pstate_funcs.get_turbo()) | |
b563b4e3 DB |
2374 | return -ENODEV; |
2375 | ||
b563b4e3 DB |
2376 | return 0; |
2377 | } | |
016c8150 | 2378 | |
7f7a516e SP |
2379 | #ifdef CONFIG_ACPI |
2380 | static void intel_pstate_use_acpi_profile(void) | |
2381 | { | |
55395345 RW |
2382 | switch (acpi_gbl_FADT.preferred_profile) { |
2383 | case PM_MOBILE: | |
2384 | case PM_TABLET: | |
2385 | case PM_APPLIANCE_PC: | |
2386 | case PM_DESKTOP: | |
2387 | case PM_WORKSTATION: | |
67dd9bf4 | 2388 | pstate_funcs.update_util = intel_pstate_update_util; |
55395345 | 2389 | } |
7f7a516e SP |
2390 | } |
2391 | #else | |
2392 | static void intel_pstate_use_acpi_profile(void) | |
2393 | { | |
2394 | } | |
2395 | #endif | |
2396 | ||
29327c84 | 2397 | static void __init copy_cpu_funcs(struct pstate_funcs *funcs) |
016c8150 DB |
2398 | { |
2399 | pstate_funcs.get_max = funcs->get_max; | |
3bcc6fa9 | 2400 | pstate_funcs.get_max_physical = funcs->get_max_physical; |
016c8150 DB |
2401 | pstate_funcs.get_min = funcs->get_min; |
2402 | pstate_funcs.get_turbo = funcs->get_turbo; | |
b27580b0 | 2403 | pstate_funcs.get_scaling = funcs->get_scaling; |
fdfdb2b1 | 2404 | pstate_funcs.get_val = funcs->get_val; |
007bea09 | 2405 | pstate_funcs.get_vid = funcs->get_vid; |
67dd9bf4 | 2406 | pstate_funcs.update_util = funcs->update_util; |
157386b6 | 2407 | |
7f7a516e | 2408 | intel_pstate_use_acpi_profile(); |
016c8150 DB |
2409 | } |
2410 | ||
9522a2ff | 2411 | #ifdef CONFIG_ACPI |
fbbcdc07 | 2412 | |
29327c84 | 2413 | static bool __init intel_pstate_no_acpi_pss(void) |
fbbcdc07 AH |
2414 | { |
2415 | int i; | |
2416 | ||
2417 | for_each_possible_cpu(i) { | |
2418 | acpi_status status; | |
2419 | union acpi_object *pss; | |
2420 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
2421 | struct acpi_processor *pr = per_cpu(processors, i); | |
2422 | ||
2423 | if (!pr) | |
2424 | continue; | |
2425 | ||
2426 | status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); | |
2427 | if (ACPI_FAILURE(status)) | |
2428 | continue; | |
2429 | ||
2430 | pss = buffer.pointer; | |
2431 | if (pss && pss->type == ACPI_TYPE_PACKAGE) { | |
2432 | kfree(pss); | |
2433 | return false; | |
2434 | } | |
2435 | ||
2436 | kfree(pss); | |
2437 | } | |
2438 | ||
2439 | return true; | |
2440 | } | |
2441 | ||
29327c84 | 2442 | static bool __init intel_pstate_has_acpi_ppc(void) |
966916ea | 2443 | { |
2444 | int i; | |
2445 | ||
2446 | for_each_possible_cpu(i) { | |
2447 | struct acpi_processor *pr = per_cpu(processors, i); | |
2448 | ||
2449 | if (!pr) | |
2450 | continue; | |
2451 | if (acpi_has_method(pr->handle, "_PPC")) | |
2452 | return true; | |
2453 | } | |
2454 | return false; | |
2455 | } | |
2456 | ||
2457 | enum { | |
2458 | PSS, | |
2459 | PPC, | |
2460 | }; | |
2461 | ||
fbbcdc07 AH |
2462 | struct hw_vendor_info { |
2463 | u16 valid; | |
2464 | char oem_id[ACPI_OEM_ID_SIZE]; | |
2465 | char oem_table_id[ACPI_OEM_TABLE_ID_SIZE]; | |
966916ea | 2466 | int oem_pwr_table; |
fbbcdc07 AH |
2467 | }; |
2468 | ||
2469 | /* Hardware vendor-specific info that has its own power management modes */ | |
29327c84 | 2470 | static struct hw_vendor_info vendor_info[] __initdata = { |
966916ea | 2471 | {1, "HP ", "ProLiant", PSS}, |
2472 | {1, "ORACLE", "X4-2 ", PPC}, | |
2473 | {1, "ORACLE", "X4-2L ", PPC}, | |
2474 | {1, "ORACLE", "X4-2B ", PPC}, | |
2475 | {1, "ORACLE", "X3-2 ", PPC}, | |
2476 | {1, "ORACLE", "X3-2L ", PPC}, | |
2477 | {1, "ORACLE", "X3-2B ", PPC}, | |
2478 | {1, "ORACLE", "X4470M2 ", PPC}, | |
2479 | {1, "ORACLE", "X4270M3 ", PPC}, | |
2480 | {1, "ORACLE", "X4270M2 ", PPC}, | |
2481 | {1, "ORACLE", "X4170M2 ", PPC}, | |
5aecc3c8 EZ |
2482 | {1, "ORACLE", "X4170 M3", PPC}, |
2483 | {1, "ORACLE", "X4275 M3", PPC}, | |
2484 | {1, "ORACLE", "X6-2 ", PPC}, | |
2485 | {1, "ORACLE", "Sudbury ", PPC}, | |
fbbcdc07 AH |
2486 | {0, "", ""}, |
2487 | }; | |
2488 | ||
29327c84 | 2489 | static bool __init intel_pstate_platform_pwr_mgmt_exists(void) |
fbbcdc07 AH |
2490 | { |
2491 | struct acpi_table_header hdr; | |
2492 | struct hw_vendor_info *v_info; | |
2f86dc4c DB |
2493 | const struct x86_cpu_id *id; |
2494 | u64 misc_pwr; | |
2495 | ||
2496 | id = x86_match_cpu(intel_pstate_cpu_oob_ids); | |
2497 | if (id) { | |
2498 | rdmsrl(MSR_MISC_PWR_MGMT, misc_pwr); | |
2499 | if ( misc_pwr & (1 << 8)) | |
2500 | return true; | |
2501 | } | |
fbbcdc07 | 2502 | |
c410833a SK |
2503 | if (acpi_disabled || |
2504 | ACPI_FAILURE(acpi_get_table_header(ACPI_SIG_FADT, 0, &hdr))) | |
fbbcdc07 AH |
2505 | return false; |
2506 | ||
2507 | for (v_info = vendor_info; v_info->valid; v_info++) { | |
c410833a | 2508 | if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE) && |
966916ea | 2509 | !strncmp(hdr.oem_table_id, v_info->oem_table_id, |
2510 | ACPI_OEM_TABLE_ID_SIZE)) | |
2511 | switch (v_info->oem_pwr_table) { | |
2512 | case PSS: | |
2513 | return intel_pstate_no_acpi_pss(); | |
2514 | case PPC: | |
aa4ea34d EZ |
2515 | return intel_pstate_has_acpi_ppc() && |
2516 | (!force_load); | |
966916ea | 2517 | } |
fbbcdc07 AH |
2518 | } |
2519 | ||
2520 | return false; | |
2521 | } | |
d0ea59e1 RW |
2522 | |
2523 | static void intel_pstate_request_control_from_smm(void) | |
2524 | { | |
2525 | /* | |
2526 | * It may be unsafe to request P-states control from SMM if _PPC support | |
2527 | * has not been enabled. | |
2528 | */ | |
2529 | if (acpi_ppc) | |
2530 | acpi_processor_pstate_control(); | |
2531 | } | |
fbbcdc07 AH |
2532 | #else /* CONFIG_ACPI not enabled */ |
2533 | static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; } | |
966916ea | 2534 | static inline bool intel_pstate_has_acpi_ppc(void) { return false; } |
d0ea59e1 | 2535 | static inline void intel_pstate_request_control_from_smm(void) {} |
fbbcdc07 AH |
2536 | #endif /* CONFIG_ACPI */ |
2537 | ||
7791e4aa SP |
2538 | static const struct x86_cpu_id hwp_support_ids[] __initconst = { |
2539 | { X86_VENDOR_INTEL, 6, X86_MODEL_ANY, X86_FEATURE_HWP }, | |
2540 | {} | |
2541 | }; | |
2542 | ||
93f0822d DB |
2543 | static int __init intel_pstate_init(void) |
2544 | { | |
eb5139d1 | 2545 | int rc; |
93f0822d | 2546 | |
6be26498 DB |
2547 | if (no_load) |
2548 | return -ENODEV; | |
2549 | ||
eb5139d1 | 2550 | if (x86_match_cpu(hwp_support_ids)) { |
2f49afc2 | 2551 | copy_cpu_funcs(&core_funcs); |
eb5139d1 | 2552 | if (no_hwp) { |
67dd9bf4 | 2553 | pstate_funcs.update_util = intel_pstate_update_util; |
eb5139d1 RW |
2554 | } else { |
2555 | hwp_active++; | |
2556 | intel_pstate.attr = hwp_cpufreq_attrs; | |
67dd9bf4 | 2557 | pstate_funcs.update_util = intel_pstate_update_util_hwp; |
eb5139d1 RW |
2558 | goto hwp_cpu_matched; |
2559 | } | |
2560 | } else { | |
2561 | const struct x86_cpu_id *id; | |
7791e4aa | 2562 | |
eb5139d1 RW |
2563 | id = x86_match_cpu(intel_pstate_cpu_ids); |
2564 | if (!id) | |
2565 | return -ENODEV; | |
93f0822d | 2566 | |
2f49afc2 | 2567 | copy_cpu_funcs((struct pstate_funcs *)id->driver_data); |
eb5139d1 | 2568 | } |
016c8150 | 2569 | |
b563b4e3 DB |
2570 | if (intel_pstate_msrs_not_valid()) |
2571 | return -ENODEV; | |
2572 | ||
7791e4aa SP |
2573 | hwp_cpu_matched: |
2574 | /* | |
2575 | * The Intel pstate driver will be ignored if the platform | |
2576 | * firmware has its own power management modes. | |
2577 | */ | |
2578 | if (intel_pstate_platform_pwr_mgmt_exists()) | |
2579 | return -ENODEV; | |
2580 | ||
fb1fe104 RW |
2581 | if (!hwp_active && hwp_only) |
2582 | return -ENOTSUPP; | |
2583 | ||
4836df17 | 2584 | pr_info("Intel P-state driver initializing\n"); |
93f0822d | 2585 | |
b57ffac5 | 2586 | all_cpu_data = vzalloc(sizeof(void *) * num_possible_cpus()); |
93f0822d DB |
2587 | if (!all_cpu_data) |
2588 | return -ENOMEM; | |
93f0822d | 2589 | |
d0ea59e1 RW |
2590 | intel_pstate_request_control_from_smm(); |
2591 | ||
93f0822d | 2592 | intel_pstate_sysfs_expose_params(); |
b69880f9 | 2593 | |
0c30b65b | 2594 | mutex_lock(&intel_pstate_driver_lock); |
ee8df89a | 2595 | rc = intel_pstate_register_driver(default_driver); |
0c30b65b | 2596 | mutex_unlock(&intel_pstate_driver_lock); |
fb1fe104 RW |
2597 | if (rc) |
2598 | return rc; | |
366430b5 | 2599 | |
7791e4aa | 2600 | if (hwp_active) |
4836df17 | 2601 | pr_info("HWP enabled\n"); |
7791e4aa | 2602 | |
fb1fe104 | 2603 | return 0; |
93f0822d DB |
2604 | } |
2605 | device_initcall(intel_pstate_init); | |
2606 | ||
6be26498 DB |
2607 | static int __init intel_pstate_setup(char *str) |
2608 | { | |
2609 | if (!str) | |
2610 | return -EINVAL; | |
2611 | ||
001c76f0 | 2612 | if (!strcmp(str, "disable")) { |
6be26498 | 2613 | no_load = 1; |
001c76f0 RW |
2614 | } else if (!strcmp(str, "passive")) { |
2615 | pr_info("Passive mode enabled\n"); | |
ee8df89a | 2616 | default_driver = &intel_cpufreq; |
001c76f0 RW |
2617 | no_hwp = 1; |
2618 | } | |
539342f6 | 2619 | if (!strcmp(str, "no_hwp")) { |
4836df17 | 2620 | pr_info("HWP disabled\n"); |
2f86dc4c | 2621 | no_hwp = 1; |
539342f6 | 2622 | } |
aa4ea34d EZ |
2623 | if (!strcmp(str, "force")) |
2624 | force_load = 1; | |
d64c3b0b KCA |
2625 | if (!strcmp(str, "hwp_only")) |
2626 | hwp_only = 1; | |
eae48f04 SP |
2627 | if (!strcmp(str, "per_cpu_perf_limits")) |
2628 | per_cpu_limits = true; | |
9522a2ff SP |
2629 | |
2630 | #ifdef CONFIG_ACPI | |
2631 | if (!strcmp(str, "support_acpi_ppc")) | |
2632 | acpi_ppc = true; | |
2633 | #endif | |
2634 | ||
6be26498 DB |
2635 | return 0; |
2636 | } | |
2637 | early_param("intel_pstate", intel_pstate_setup); | |
2638 | ||
93f0822d DB |
2639 | MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@intel.com>"); |
2640 | MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors"); | |
2641 | MODULE_LICENSE("GPL"); |