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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 | 43 | #define INTEL_CPUFREQ_TRANSITION_LATENCY 20000 |
1b72e7fd | 44 | #define INTEL_CPUFREQ_TRANSITION_DELAY 500 |
001c76f0 | 45 | |
9522a2ff SP |
46 | #ifdef CONFIG_ACPI |
47 | #include <acpi/processor.h> | |
17669006 | 48 | #include <acpi/cppc_acpi.h> |
9522a2ff SP |
49 | #endif |
50 | ||
f0fe3cd7 | 51 | #define FRAC_BITS 8 |
93f0822d DB |
52 | #define int_tofp(X) ((int64_t)(X) << FRAC_BITS) |
53 | #define fp_toint(X) ((X) >> FRAC_BITS) | |
f0fe3cd7 | 54 | |
a1c9787d RW |
55 | #define EXT_BITS 6 |
56 | #define EXT_FRAC_BITS (EXT_BITS + FRAC_BITS) | |
d5dd33d9 SP |
57 | #define fp_ext_toint(X) ((X) >> EXT_FRAC_BITS) |
58 | #define int_ext_tofp(X) ((int64_t)(X) << EXT_FRAC_BITS) | |
a1c9787d | 59 | |
93f0822d DB |
60 | static inline int32_t mul_fp(int32_t x, int32_t y) |
61 | { | |
62 | return ((int64_t)x * (int64_t)y) >> FRAC_BITS; | |
63 | } | |
64 | ||
7180dddf | 65 | static inline int32_t div_fp(s64 x, s64 y) |
93f0822d | 66 | { |
7180dddf | 67 | return div64_s64((int64_t)x << FRAC_BITS, y); |
93f0822d DB |
68 | } |
69 | ||
d022a65e DB |
70 | static inline int ceiling_fp(int32_t x) |
71 | { | |
72 | int mask, ret; | |
73 | ||
74 | ret = fp_toint(x); | |
75 | mask = (1 << FRAC_BITS) - 1; | |
76 | if (x & mask) | |
77 | ret += 1; | |
78 | return ret; | |
79 | } | |
80 | ||
ff35f02e RW |
81 | static inline int32_t percent_fp(int percent) |
82 | { | |
83 | return div_fp(percent, 100); | |
84 | } | |
85 | ||
a1c9787d RW |
86 | static inline u64 mul_ext_fp(u64 x, u64 y) |
87 | { | |
88 | return (x * y) >> EXT_FRAC_BITS; | |
89 | } | |
90 | ||
91 | static inline u64 div_ext_fp(u64 x, u64 y) | |
92 | { | |
93 | return div64_u64(x << EXT_FRAC_BITS, y); | |
94 | } | |
95 | ||
e4c204ce RW |
96 | static inline int32_t percent_ext_fp(int percent) |
97 | { | |
98 | return div_ext_fp(percent, 100); | |
99 | } | |
100 | ||
13ad7701 SP |
101 | /** |
102 | * struct sample - Store performance sample | |
a1c9787d | 103 | * @core_avg_perf: Ratio of APERF/MPERF which is the actual average |
13ad7701 SP |
104 | * performance during last sample period |
105 | * @busy_scaled: Scaled busy value which is used to calculate next | |
a1c9787d | 106 | * P state. This can be different than core_avg_perf |
13ad7701 SP |
107 | * to account for cpu idle period |
108 | * @aperf: Difference of actual performance frequency clock count | |
109 | * read from APERF MSR between last and current sample | |
110 | * @mperf: Difference of maximum performance frequency clock count | |
111 | * read from MPERF MSR between last and current sample | |
112 | * @tsc: Difference of time stamp counter between last and | |
113 | * current sample | |
13ad7701 SP |
114 | * @time: Current time from scheduler |
115 | * | |
116 | * This structure is used in the cpudata structure to store performance sample | |
117 | * data for choosing next P State. | |
118 | */ | |
93f0822d | 119 | struct sample { |
a1c9787d | 120 | int32_t core_avg_perf; |
157386b6 | 121 | int32_t busy_scaled; |
93f0822d DB |
122 | u64 aperf; |
123 | u64 mperf; | |
4055fad3 | 124 | u64 tsc; |
a4675fbc | 125 | u64 time; |
93f0822d DB |
126 | }; |
127 | ||
13ad7701 SP |
128 | /** |
129 | * struct pstate_data - Store P state data | |
130 | * @current_pstate: Current requested P state | |
131 | * @min_pstate: Min P state possible for this platform | |
132 | * @max_pstate: Max P state possible for this platform | |
133 | * @max_pstate_physical:This is physical Max P state for a processor | |
134 | * This can be higher than the max_pstate which can | |
135 | * be limited by platform thermal design power limits | |
136 | * @scaling: Scaling factor to convert frequency to cpufreq | |
137 | * frequency units | |
138 | * @turbo_pstate: Max Turbo P state possible for this platform | |
001c76f0 RW |
139 | * @max_freq: @max_pstate frequency in cpufreq units |
140 | * @turbo_freq: @turbo_pstate frequency in cpufreq units | |
13ad7701 SP |
141 | * |
142 | * Stores the per cpu model P state limits and current P state. | |
143 | */ | |
93f0822d DB |
144 | struct pstate_data { |
145 | int current_pstate; | |
146 | int min_pstate; | |
147 | int max_pstate; | |
3bcc6fa9 | 148 | int max_pstate_physical; |
b27580b0 | 149 | int scaling; |
93f0822d | 150 | int turbo_pstate; |
001c76f0 RW |
151 | unsigned int max_freq; |
152 | unsigned int turbo_freq; | |
93f0822d DB |
153 | }; |
154 | ||
13ad7701 SP |
155 | /** |
156 | * struct vid_data - Stores voltage information data | |
157 | * @min: VID data for this platform corresponding to | |
158 | * the lowest P state | |
159 | * @max: VID data corresponding to the highest P State. | |
160 | * @turbo: VID data for turbo P state | |
161 | * @ratio: Ratio of (vid max - vid min) / | |
162 | * (max P state - Min P State) | |
163 | * | |
164 | * Stores the voltage data for DVFS (Dynamic Voltage and Frequency Scaling) | |
165 | * This data is used in Atom platforms, where in addition to target P state, | |
166 | * the voltage data needs to be specified to select next P State. | |
167 | */ | |
007bea09 | 168 | struct vid_data { |
21855ff5 DB |
169 | int min; |
170 | int max; | |
171 | int turbo; | |
007bea09 DB |
172 | int32_t ratio; |
173 | }; | |
174 | ||
13ad7701 SP |
175 | /** |
176 | * struct _pid - Stores PID data | |
177 | * @setpoint: Target set point for busyness or performance | |
178 | * @integral: Storage for accumulated error values | |
179 | * @p_gain: PID proportional gain | |
180 | * @i_gain: PID integral gain | |
181 | * @d_gain: PID derivative gain | |
182 | * @deadband: PID deadband | |
183 | * @last_err: Last error storage for integral part of PID calculation | |
184 | * | |
185 | * Stores PID coefficients and last error for PID controller. | |
186 | */ | |
93f0822d DB |
187 | struct _pid { |
188 | int setpoint; | |
189 | int32_t integral; | |
190 | int32_t p_gain; | |
191 | int32_t i_gain; | |
192 | int32_t d_gain; | |
193 | int deadband; | |
d253d2a5 | 194 | int32_t last_err; |
93f0822d DB |
195 | }; |
196 | ||
c5a2ee7d RW |
197 | /** |
198 | * struct global_params - Global parameters, mostly tunable via sysfs. | |
199 | * @no_turbo: Whether or not to use turbo P-states. | |
200 | * @turbo_disabled: Whethet or not turbo P-states are available at all, | |
201 | * based on the MSR_IA32_MISC_ENABLE value and whether or | |
202 | * not the maximum reported turbo P-state is different from | |
203 | * the maximum reported non-turbo one. | |
204 | * @min_perf_pct: Minimum capacity limit in percent of the maximum turbo | |
205 | * P-state capacity. | |
206 | * @max_perf_pct: Maximum capacity limit in percent of the maximum turbo | |
207 | * P-state capacity. | |
208 | */ | |
209 | struct global_params { | |
210 | bool no_turbo; | |
211 | bool turbo_disabled; | |
212 | int max_perf_pct; | |
213 | int min_perf_pct; | |
eae48f04 SP |
214 | }; |
215 | ||
13ad7701 SP |
216 | /** |
217 | * struct cpudata - Per CPU instance data storage | |
218 | * @cpu: CPU number for this instance data | |
2f1d407a | 219 | * @policy: CPUFreq policy value |
13ad7701 | 220 | * @update_util: CPUFreq utility callback information |
4578ee7e | 221 | * @update_util_set: CPUFreq utility callback is set |
09c448d3 RW |
222 | * @iowait_boost: iowait-related boost fraction |
223 | * @last_update: Time of the last update. | |
13ad7701 SP |
224 | * @pstate: Stores P state limits for this CPU |
225 | * @vid: Stores VID limits for this CPU | |
226 | * @pid: Stores PID parameters for this CPU | |
227 | * @last_sample_time: Last Sample time | |
228 | * @prev_aperf: Last APERF value read from APERF MSR | |
229 | * @prev_mperf: Last MPERF value read from MPERF MSR | |
230 | * @prev_tsc: Last timestamp counter (TSC) value | |
231 | * @prev_cummulative_iowait: IO Wait time difference from last and | |
232 | * current sample | |
233 | * @sample: Storage for storing last Sample data | |
1a4fe38a SP |
234 | * @min_perf_ratio: Minimum capacity in terms of PERF or HWP ratios |
235 | * @max_perf_ratio: Maximum capacity in terms of PERF or HWP ratios | |
9522a2ff SP |
236 | * @acpi_perf_data: Stores ACPI perf information read from _PSS |
237 | * @valid_pss_table: Set to true for valid ACPI _PSS entries found | |
984edbdc SP |
238 | * @epp_powersave: Last saved HWP energy performance preference |
239 | * (EPP) or energy performance bias (EPB), | |
240 | * when policy switched to performance | |
8442885f | 241 | * @epp_policy: Last saved policy used to set EPP/EPB |
984edbdc SP |
242 | * @epp_default: Power on default HWP energy performance |
243 | * preference/bias | |
244 | * @epp_saved: Saved EPP/EPB during system suspend or CPU offline | |
245 | * operation | |
13ad7701 SP |
246 | * |
247 | * This structure stores per CPU instance data for all CPUs. | |
248 | */ | |
93f0822d DB |
249 | struct cpudata { |
250 | int cpu; | |
251 | ||
2f1d407a | 252 | unsigned int policy; |
a4675fbc | 253 | struct update_util_data update_util; |
4578ee7e | 254 | bool update_util_set; |
93f0822d | 255 | |
93f0822d | 256 | struct pstate_data pstate; |
007bea09 | 257 | struct vid_data vid; |
93f0822d | 258 | struct _pid pid; |
93f0822d | 259 | |
09c448d3 | 260 | u64 last_update; |
a4675fbc | 261 | u64 last_sample_time; |
93f0822d DB |
262 | u64 prev_aperf; |
263 | u64 prev_mperf; | |
4055fad3 | 264 | u64 prev_tsc; |
63d1d656 | 265 | u64 prev_cummulative_iowait; |
d37e2b76 | 266 | struct sample sample; |
1a4fe38a SP |
267 | int32_t min_perf_ratio; |
268 | int32_t max_perf_ratio; | |
9522a2ff SP |
269 | #ifdef CONFIG_ACPI |
270 | struct acpi_processor_performance acpi_perf_data; | |
271 | bool valid_pss_table; | |
272 | #endif | |
09c448d3 | 273 | unsigned int iowait_boost; |
984edbdc | 274 | s16 epp_powersave; |
8442885f | 275 | s16 epp_policy; |
984edbdc SP |
276 | s16 epp_default; |
277 | s16 epp_saved; | |
93f0822d DB |
278 | }; |
279 | ||
280 | static struct cpudata **all_cpu_data; | |
13ad7701 SP |
281 | |
282 | /** | |
3954517e | 283 | * struct pstate_adjust_policy - Stores static PID configuration data |
13ad7701 SP |
284 | * @sample_rate_ms: PID calculation sample rate in ms |
285 | * @sample_rate_ns: Sample rate calculation in ns | |
286 | * @deadband: PID deadband | |
287 | * @setpoint: PID Setpoint | |
288 | * @p_gain_pct: PID proportional gain | |
289 | * @i_gain_pct: PID integral gain | |
290 | * @d_gain_pct: PID derivative gain | |
291 | * | |
292 | * Stores per CPU model static PID configuration data. | |
293 | */ | |
93f0822d DB |
294 | struct pstate_adjust_policy { |
295 | int sample_rate_ms; | |
a4675fbc | 296 | s64 sample_rate_ns; |
93f0822d DB |
297 | int deadband; |
298 | int setpoint; | |
299 | int p_gain_pct; | |
300 | int d_gain_pct; | |
301 | int i_gain_pct; | |
302 | }; | |
303 | ||
13ad7701 SP |
304 | /** |
305 | * struct pstate_funcs - Per CPU model specific callbacks | |
306 | * @get_max: Callback to get maximum non turbo effective P state | |
307 | * @get_max_physical: Callback to get maximum non turbo physical P state | |
308 | * @get_min: Callback to get minimum P state | |
309 | * @get_turbo: Callback to get turbo P state | |
310 | * @get_scaling: Callback to get frequency scaling factor | |
311 | * @get_val: Callback to convert P state to actual MSR write value | |
312 | * @get_vid: Callback to get VID data for Atom platforms | |
67dd9bf4 | 313 | * @update_util: Active mode utilization update callback. |
13ad7701 SP |
314 | * |
315 | * Core and Atom CPU models have different way to get P State limits. This | |
316 | * structure is used to store those callbacks. | |
317 | */ | |
016c8150 DB |
318 | struct pstate_funcs { |
319 | int (*get_max)(void); | |
3bcc6fa9 | 320 | int (*get_max_physical)(void); |
016c8150 DB |
321 | int (*get_min)(void); |
322 | int (*get_turbo)(void); | |
b27580b0 | 323 | int (*get_scaling)(void); |
fdfdb2b1 | 324 | u64 (*get_val)(struct cpudata*, int pstate); |
007bea09 | 325 | void (*get_vid)(struct cpudata *); |
67dd9bf4 RW |
326 | void (*update_util)(struct update_util_data *data, u64 time, |
327 | unsigned int flags); | |
93f0822d DB |
328 | }; |
329 | ||
4a7cb7a9 | 330 | static struct pstate_funcs pstate_funcs __read_mostly; |
5c439053 RW |
331 | static struct pstate_adjust_policy pid_params __read_mostly = { |
332 | .sample_rate_ms = 10, | |
333 | .sample_rate_ns = 10 * NSEC_PER_MSEC, | |
334 | .deadband = 0, | |
335 | .setpoint = 97, | |
336 | .p_gain_pct = 20, | |
337 | .d_gain_pct = 0, | |
338 | .i_gain_pct = 0, | |
339 | }; | |
340 | ||
4a7cb7a9 | 341 | static int hwp_active __read_mostly; |
eae48f04 | 342 | static bool per_cpu_limits __read_mostly; |
016c8150 | 343 | |
ee8df89a | 344 | static struct cpufreq_driver *intel_pstate_driver __read_mostly; |
0c30b65b | 345 | |
9522a2ff SP |
346 | #ifdef CONFIG_ACPI |
347 | static bool acpi_ppc; | |
348 | #endif | |
13ad7701 | 349 | |
c5a2ee7d | 350 | static struct global_params global; |
93f0822d | 351 | |
0c30b65b | 352 | static DEFINE_MUTEX(intel_pstate_driver_lock); |
a410c03d SP |
353 | static DEFINE_MUTEX(intel_pstate_limits_lock); |
354 | ||
9522a2ff | 355 | #ifdef CONFIG_ACPI |
2b3ec765 SP |
356 | |
357 | static bool intel_pstate_get_ppc_enable_status(void) | |
358 | { | |
359 | if (acpi_gbl_FADT.preferred_profile == PM_ENTERPRISE_SERVER || | |
360 | acpi_gbl_FADT.preferred_profile == PM_PERFORMANCE_SERVER) | |
361 | return true; | |
362 | ||
363 | return acpi_ppc; | |
364 | } | |
365 | ||
17669006 RW |
366 | #ifdef CONFIG_ACPI_CPPC_LIB |
367 | ||
368 | /* The work item is needed to avoid CPU hotplug locking issues */ | |
369 | static void intel_pstste_sched_itmt_work_fn(struct work_struct *work) | |
370 | { | |
371 | sched_set_itmt_support(); | |
372 | } | |
373 | ||
374 | static DECLARE_WORK(sched_itmt_work, intel_pstste_sched_itmt_work_fn); | |
375 | ||
376 | static void intel_pstate_set_itmt_prio(int cpu) | |
377 | { | |
378 | struct cppc_perf_caps cppc_perf; | |
379 | static u32 max_highest_perf = 0, min_highest_perf = U32_MAX; | |
380 | int ret; | |
381 | ||
382 | ret = cppc_get_perf_caps(cpu, &cppc_perf); | |
383 | if (ret) | |
384 | return; | |
385 | ||
386 | /* | |
387 | * The priorities can be set regardless of whether or not | |
388 | * sched_set_itmt_support(true) has been called and it is valid to | |
389 | * update them at any time after it has been called. | |
390 | */ | |
391 | sched_set_itmt_core_prio(cppc_perf.highest_perf, cpu); | |
392 | ||
393 | if (max_highest_perf <= min_highest_perf) { | |
394 | if (cppc_perf.highest_perf > max_highest_perf) | |
395 | max_highest_perf = cppc_perf.highest_perf; | |
396 | ||
397 | if (cppc_perf.highest_perf < min_highest_perf) | |
398 | min_highest_perf = cppc_perf.highest_perf; | |
399 | ||
400 | if (max_highest_perf > min_highest_perf) { | |
401 | /* | |
402 | * This code can be run during CPU online under the | |
403 | * CPU hotplug locks, so sched_set_itmt_support() | |
404 | * cannot be called from here. Queue up a work item | |
405 | * to invoke it. | |
406 | */ | |
407 | schedule_work(&sched_itmt_work); | |
408 | } | |
409 | } | |
410 | } | |
411 | #else | |
412 | static void intel_pstate_set_itmt_prio(int cpu) | |
413 | { | |
414 | } | |
415 | #endif | |
416 | ||
9522a2ff SP |
417 | static void intel_pstate_init_acpi_perf_limits(struct cpufreq_policy *policy) |
418 | { | |
419 | struct cpudata *cpu; | |
9522a2ff SP |
420 | int ret; |
421 | int i; | |
422 | ||
17669006 RW |
423 | if (hwp_active) { |
424 | intel_pstate_set_itmt_prio(policy->cpu); | |
e59a8f7f | 425 | return; |
17669006 | 426 | } |
e59a8f7f | 427 | |
2b3ec765 | 428 | if (!intel_pstate_get_ppc_enable_status()) |
9522a2ff SP |
429 | return; |
430 | ||
431 | cpu = all_cpu_data[policy->cpu]; | |
432 | ||
433 | ret = acpi_processor_register_performance(&cpu->acpi_perf_data, | |
434 | policy->cpu); | |
435 | if (ret) | |
436 | return; | |
437 | ||
438 | /* | |
439 | * Check if the control value in _PSS is for PERF_CTL MSR, which should | |
440 | * guarantee that the states returned by it map to the states in our | |
441 | * list directly. | |
442 | */ | |
443 | if (cpu->acpi_perf_data.control_register.space_id != | |
444 | ACPI_ADR_SPACE_FIXED_HARDWARE) | |
445 | goto err; | |
446 | ||
447 | /* | |
448 | * If there is only one entry _PSS, simply ignore _PSS and continue as | |
449 | * usual without taking _PSS into account | |
450 | */ | |
451 | if (cpu->acpi_perf_data.state_count < 2) | |
452 | goto err; | |
453 | ||
454 | pr_debug("CPU%u - ACPI _PSS perf data\n", policy->cpu); | |
455 | for (i = 0; i < cpu->acpi_perf_data.state_count; i++) { | |
456 | pr_debug(" %cP%d: %u MHz, %u mW, 0x%x\n", | |
457 | (i == cpu->acpi_perf_data.state ? '*' : ' '), i, | |
458 | (u32) cpu->acpi_perf_data.states[i].core_frequency, | |
459 | (u32) cpu->acpi_perf_data.states[i].power, | |
460 | (u32) cpu->acpi_perf_data.states[i].control); | |
461 | } | |
462 | ||
463 | /* | |
464 | * The _PSS table doesn't contain whole turbo frequency range. | |
465 | * This just contains +1 MHZ above the max non turbo frequency, | |
466 | * with control value corresponding to max turbo ratio. But | |
467 | * when cpufreq set policy is called, it will call with this | |
468 | * max frequency, which will cause a reduced performance as | |
469 | * this driver uses real max turbo frequency as the max | |
470 | * frequency. So correct this frequency in _PSS table to | |
b00345d1 | 471 | * correct max turbo frequency based on the turbo state. |
9522a2ff SP |
472 | * Also need to convert to MHz as _PSS freq is in MHz. |
473 | */ | |
7de32556 | 474 | if (!global.turbo_disabled) |
9522a2ff SP |
475 | cpu->acpi_perf_data.states[0].core_frequency = |
476 | policy->cpuinfo.max_freq / 1000; | |
477 | cpu->valid_pss_table = true; | |
6cacd115 | 478 | pr_debug("_PPC limits will be enforced\n"); |
9522a2ff SP |
479 | |
480 | return; | |
481 | ||
482 | err: | |
483 | cpu->valid_pss_table = false; | |
484 | acpi_processor_unregister_performance(policy->cpu); | |
485 | } | |
486 | ||
487 | static void intel_pstate_exit_perf_limits(struct cpufreq_policy *policy) | |
488 | { | |
489 | struct cpudata *cpu; | |
490 | ||
491 | cpu = all_cpu_data[policy->cpu]; | |
492 | if (!cpu->valid_pss_table) | |
493 | return; | |
494 | ||
495 | acpi_processor_unregister_performance(policy->cpu); | |
496 | } | |
9522a2ff | 497 | #else |
7a3ba767 | 498 | static inline void intel_pstate_init_acpi_perf_limits(struct cpufreq_policy *policy) |
9522a2ff SP |
499 | { |
500 | } | |
501 | ||
7a3ba767 | 502 | static inline void intel_pstate_exit_perf_limits(struct cpufreq_policy *policy) |
9522a2ff SP |
503 | { |
504 | } | |
505 | #endif | |
506 | ||
d253d2a5 | 507 | static signed int pid_calc(struct _pid *pid, int32_t busy) |
93f0822d | 508 | { |
d253d2a5 | 509 | signed int result; |
93f0822d DB |
510 | int32_t pterm, dterm, fp_error; |
511 | int32_t integral_limit; | |
512 | ||
b54a0dfd | 513 | fp_error = pid->setpoint - busy; |
93f0822d | 514 | |
b54a0dfd | 515 | if (abs(fp_error) <= pid->deadband) |
93f0822d DB |
516 | return 0; |
517 | ||
518 | pterm = mul_fp(pid->p_gain, fp_error); | |
519 | ||
520 | pid->integral += fp_error; | |
521 | ||
e0d4c8f8 KCA |
522 | /* |
523 | * We limit the integral here so that it will never | |
524 | * get higher than 30. This prevents it from becoming | |
525 | * too large an input over long periods of time and allows | |
526 | * it to get factored out sooner. | |
527 | * | |
528 | * The value of 30 was chosen through experimentation. | |
529 | */ | |
93f0822d DB |
530 | integral_limit = int_tofp(30); |
531 | if (pid->integral > integral_limit) | |
532 | pid->integral = integral_limit; | |
533 | if (pid->integral < -integral_limit) | |
534 | pid->integral = -integral_limit; | |
535 | ||
d253d2a5 BS |
536 | dterm = mul_fp(pid->d_gain, fp_error - pid->last_err); |
537 | pid->last_err = fp_error; | |
93f0822d DB |
538 | |
539 | result = pterm + mul_fp(pid->integral, pid->i_gain) + dterm; | |
51d211e9 | 540 | result = result + (1 << (FRAC_BITS-1)); |
93f0822d DB |
541 | return (signed int)fp_toint(result); |
542 | } | |
543 | ||
ff35f02e | 544 | static inline void intel_pstate_pid_reset(struct cpudata *cpu) |
93f0822d | 545 | { |
ff35f02e | 546 | struct _pid *pid = &cpu->pid; |
93f0822d | 547 | |
ff35f02e RW |
548 | pid->p_gain = percent_fp(pid_params.p_gain_pct); |
549 | pid->d_gain = percent_fp(pid_params.d_gain_pct); | |
550 | pid->i_gain = percent_fp(pid_params.i_gain_pct); | |
551 | pid->setpoint = int_tofp(pid_params.setpoint); | |
552 | pid->last_err = pid->setpoint - int_tofp(100); | |
553 | pid->deadband = int_tofp(pid_params.deadband); | |
554 | pid->integral = 0; | |
93f0822d DB |
555 | } |
556 | ||
4521e1a0 GM |
557 | static inline void update_turbo_state(void) |
558 | { | |
559 | u64 misc_en; | |
560 | struct cpudata *cpu; | |
561 | ||
562 | cpu = all_cpu_data[0]; | |
563 | rdmsrl(MSR_IA32_MISC_ENABLE, misc_en); | |
7de32556 | 564 | global.turbo_disabled = |
4521e1a0 GM |
565 | (misc_en & MSR_IA32_MISC_ENABLE_TURBO_DISABLE || |
566 | cpu->pstate.max_pstate == cpu->pstate.turbo_pstate); | |
567 | } | |
568 | ||
c5a2ee7d RW |
569 | static int min_perf_pct_min(void) |
570 | { | |
571 | struct cpudata *cpu = all_cpu_data[0]; | |
57caf4ec | 572 | int turbo_pstate = cpu->pstate.turbo_pstate; |
c5a2ee7d | 573 | |
57caf4ec RW |
574 | return turbo_pstate ? |
575 | DIV_ROUND_UP(cpu->pstate.min_pstate * 100, turbo_pstate) : 0; | |
c5a2ee7d RW |
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 | ||
1a4fe38a SP |
795 | static void intel_pstate_get_hwp_max(unsigned int cpu, int *phy_max, |
796 | int *current_max) | |
2f86dc4c | 797 | { |
1a4fe38a | 798 | u64 cap; |
74da56ce | 799 | |
2bfc4cbb | 800 | rdmsrl_on_cpu(cpu, MSR_HWP_CAPABILITIES, &cap); |
2bfc4cbb | 801 | if (global.no_turbo) |
1a4fe38a | 802 | *current_max = HWP_GUARANTEED_PERF(cap); |
2bfc4cbb | 803 | else |
1a4fe38a SP |
804 | *current_max = HWP_HIGHEST_PERF(cap); |
805 | ||
806 | *phy_max = HWP_HIGHEST_PERF(cap); | |
807 | } | |
808 | ||
809 | static void intel_pstate_hwp_set(unsigned int cpu) | |
810 | { | |
811 | struct cpudata *cpu_data = all_cpu_data[cpu]; | |
812 | int max, min; | |
813 | u64 value; | |
814 | s16 epp; | |
815 | ||
816 | max = cpu_data->max_perf_ratio; | |
817 | min = cpu_data->min_perf_ratio; | |
eae48f04 | 818 | |
2bfc4cbb RW |
819 | if (cpu_data->policy == CPUFREQ_POLICY_PERFORMANCE) |
820 | min = max; | |
3f8ed54a | 821 | |
2bfc4cbb | 822 | rdmsrl_on_cpu(cpu, MSR_HWP_REQUEST, &value); |
2f86dc4c | 823 | |
2bfc4cbb RW |
824 | value &= ~HWP_MIN_PERF(~0L); |
825 | value |= HWP_MIN_PERF(min); | |
8442885f | 826 | |
2bfc4cbb RW |
827 | value &= ~HWP_MAX_PERF(~0L); |
828 | value |= HWP_MAX_PERF(max); | |
8442885f | 829 | |
2bfc4cbb RW |
830 | if (cpu_data->epp_policy == cpu_data->policy) |
831 | goto skip_epp; | |
8442885f | 832 | |
2bfc4cbb | 833 | cpu_data->epp_policy = cpu_data->policy; |
984edbdc | 834 | |
2bfc4cbb RW |
835 | if (cpu_data->epp_saved >= 0) { |
836 | epp = cpu_data->epp_saved; | |
837 | cpu_data->epp_saved = -EINVAL; | |
838 | goto update_epp; | |
839 | } | |
8442885f | 840 | |
2bfc4cbb RW |
841 | if (cpu_data->policy == CPUFREQ_POLICY_PERFORMANCE) { |
842 | epp = intel_pstate_get_epp(cpu_data, value); | |
843 | cpu_data->epp_powersave = epp; | |
844 | /* If EPP read was failed, then don't try to write */ | |
845 | if (epp < 0) | |
846 | goto skip_epp; | |
8442885f | 847 | |
2bfc4cbb RW |
848 | epp = 0; |
849 | } else { | |
850 | /* skip setting EPP, when saved value is invalid */ | |
851 | if (cpu_data->epp_powersave < 0) | |
852 | goto skip_epp; | |
8442885f | 853 | |
2bfc4cbb RW |
854 | /* |
855 | * No need to restore EPP when it is not zero. This | |
856 | * means: | |
857 | * - Policy is not changed | |
858 | * - user has manually changed | |
859 | * - Error reading EPB | |
860 | */ | |
861 | epp = intel_pstate_get_epp(cpu_data, value); | |
862 | if (epp) | |
863 | goto skip_epp; | |
8442885f | 864 | |
2bfc4cbb RW |
865 | epp = cpu_data->epp_powersave; |
866 | } | |
984edbdc | 867 | update_epp: |
2bfc4cbb RW |
868 | if (static_cpu_has(X86_FEATURE_HWP_EPP)) { |
869 | value &= ~GENMASK_ULL(31, 24); | |
870 | value |= (u64)epp << 24; | |
871 | } else { | |
872 | intel_pstate_set_epb(cpu, epp); | |
2f86dc4c | 873 | } |
2bfc4cbb RW |
874 | skip_epp: |
875 | wrmsrl_on_cpu(cpu, MSR_HWP_REQUEST, value); | |
41cfd64c | 876 | } |
2f86dc4c | 877 | |
984edbdc SP |
878 | static int intel_pstate_hwp_save_state(struct cpufreq_policy *policy) |
879 | { | |
880 | struct cpudata *cpu_data = all_cpu_data[policy->cpu]; | |
881 | ||
882 | if (!hwp_active) | |
883 | return 0; | |
884 | ||
885 | cpu_data->epp_saved = intel_pstate_get_epp(cpu_data, 0); | |
886 | ||
887 | return 0; | |
888 | } | |
889 | ||
8442885f SP |
890 | static int intel_pstate_resume(struct cpufreq_policy *policy) |
891 | { | |
892 | if (!hwp_active) | |
893 | return 0; | |
894 | ||
aa439248 RW |
895 | mutex_lock(&intel_pstate_limits_lock); |
896 | ||
8442885f | 897 | all_cpu_data[policy->cpu]->epp_policy = 0; |
2bfc4cbb | 898 | intel_pstate_hwp_set(policy->cpu); |
aa439248 RW |
899 | |
900 | mutex_unlock(&intel_pstate_limits_lock); | |
901 | ||
5f98ced1 | 902 | return 0; |
8442885f SP |
903 | } |
904 | ||
111b8b3f | 905 | static void intel_pstate_update_policies(void) |
41cfd64c | 906 | { |
111b8b3f RW |
907 | int cpu; |
908 | ||
909 | for_each_possible_cpu(cpu) | |
910 | cpufreq_update_policy(cpu); | |
2f86dc4c DB |
911 | } |
912 | ||
93f0822d DB |
913 | /************************** debugfs begin ************************/ |
914 | static int pid_param_set(void *data, u64 val) | |
915 | { | |
4ddd0146 RW |
916 | unsigned int cpu; |
917 | ||
93f0822d | 918 | *(u32 *)data = val; |
6e7408ac | 919 | pid_params.sample_rate_ns = pid_params.sample_rate_ms * NSEC_PER_MSEC; |
4ddd0146 RW |
920 | for_each_possible_cpu(cpu) |
921 | if (all_cpu_data[cpu]) | |
ff35f02e | 922 | intel_pstate_pid_reset(all_cpu_data[cpu]); |
4ddd0146 | 923 | |
93f0822d DB |
924 | return 0; |
925 | } | |
845c1cbe | 926 | |
93f0822d DB |
927 | static int pid_param_get(void *data, u64 *val) |
928 | { | |
929 | *val = *(u32 *)data; | |
930 | return 0; | |
931 | } | |
2d8d1f18 | 932 | DEFINE_SIMPLE_ATTRIBUTE(fops_pid_param, pid_param_get, pid_param_set, "%llu\n"); |
93f0822d | 933 | |
fb1fe104 RW |
934 | static struct dentry *debugfs_parent; |
935 | ||
93f0822d DB |
936 | struct pid_param { |
937 | char *name; | |
938 | void *value; | |
fb1fe104 | 939 | struct dentry *dentry; |
93f0822d DB |
940 | }; |
941 | ||
942 | static struct pid_param pid_files[] = { | |
fb1fe104 RW |
943 | {"sample_rate_ms", &pid_params.sample_rate_ms, }, |
944 | {"d_gain_pct", &pid_params.d_gain_pct, }, | |
945 | {"i_gain_pct", &pid_params.i_gain_pct, }, | |
946 | {"deadband", &pid_params.deadband, }, | |
947 | {"setpoint", &pid_params.setpoint, }, | |
948 | {"p_gain_pct", &pid_params.p_gain_pct, }, | |
949 | {NULL, NULL, } | |
93f0822d DB |
950 | }; |
951 | ||
fb1fe104 | 952 | static void intel_pstate_debug_expose_params(void) |
93f0822d | 953 | { |
fb1fe104 | 954 | int i; |
93f0822d DB |
955 | |
956 | debugfs_parent = debugfs_create_dir("pstate_snb", NULL); | |
957 | if (IS_ERR_OR_NULL(debugfs_parent)) | |
958 | return; | |
fb1fe104 RW |
959 | |
960 | for (i = 0; pid_files[i].name; i++) { | |
961 | struct dentry *dentry; | |
962 | ||
963 | dentry = debugfs_create_file(pid_files[i].name, 0660, | |
964 | debugfs_parent, pid_files[i].value, | |
965 | &fops_pid_param); | |
966 | if (!IS_ERR(dentry)) | |
967 | pid_files[i].dentry = dentry; | |
93f0822d DB |
968 | } |
969 | } | |
970 | ||
fb1fe104 RW |
971 | static void intel_pstate_debug_hide_params(void) |
972 | { | |
973 | int i; | |
974 | ||
975 | if (IS_ERR_OR_NULL(debugfs_parent)) | |
976 | return; | |
977 | ||
978 | for (i = 0; pid_files[i].name; i++) { | |
979 | debugfs_remove(pid_files[i].dentry); | |
980 | pid_files[i].dentry = NULL; | |
93f0822d | 981 | } |
fb1fe104 RW |
982 | |
983 | debugfs_remove(debugfs_parent); | |
984 | debugfs_parent = NULL; | |
93f0822d DB |
985 | } |
986 | ||
987 | /************************** debugfs end ************************/ | |
988 | ||
989 | /************************** sysfs begin ************************/ | |
990 | #define show_one(file_name, object) \ | |
991 | static ssize_t show_##file_name \ | |
992 | (struct kobject *kobj, struct attribute *attr, char *buf) \ | |
993 | { \ | |
7de32556 | 994 | return sprintf(buf, "%u\n", global.object); \ |
93f0822d DB |
995 | } |
996 | ||
fb1fe104 RW |
997 | static ssize_t intel_pstate_show_status(char *buf); |
998 | static int intel_pstate_update_status(const char *buf, size_t size); | |
999 | ||
1000 | static ssize_t show_status(struct kobject *kobj, | |
1001 | struct attribute *attr, char *buf) | |
1002 | { | |
1003 | ssize_t ret; | |
1004 | ||
1005 | mutex_lock(&intel_pstate_driver_lock); | |
1006 | ret = intel_pstate_show_status(buf); | |
1007 | mutex_unlock(&intel_pstate_driver_lock); | |
1008 | ||
1009 | return ret; | |
1010 | } | |
1011 | ||
1012 | static ssize_t store_status(struct kobject *a, struct attribute *b, | |
1013 | const char *buf, size_t count) | |
1014 | { | |
1015 | char *p = memchr(buf, '\n', count); | |
1016 | int ret; | |
1017 | ||
1018 | mutex_lock(&intel_pstate_driver_lock); | |
1019 | ret = intel_pstate_update_status(buf, p ? p - buf : count); | |
1020 | mutex_unlock(&intel_pstate_driver_lock); | |
1021 | ||
1022 | return ret < 0 ? ret : count; | |
1023 | } | |
1024 | ||
d01b1f48 KCA |
1025 | static ssize_t show_turbo_pct(struct kobject *kobj, |
1026 | struct attribute *attr, char *buf) | |
1027 | { | |
1028 | struct cpudata *cpu; | |
1029 | int total, no_turbo, turbo_pct; | |
1030 | uint32_t turbo_fp; | |
1031 | ||
0c30b65b RW |
1032 | mutex_lock(&intel_pstate_driver_lock); |
1033 | ||
ee8df89a | 1034 | if (!intel_pstate_driver) { |
0c30b65b RW |
1035 | mutex_unlock(&intel_pstate_driver_lock); |
1036 | return -EAGAIN; | |
1037 | } | |
1038 | ||
d01b1f48 KCA |
1039 | cpu = all_cpu_data[0]; |
1040 | ||
1041 | total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1; | |
1042 | no_turbo = cpu->pstate.max_pstate - cpu->pstate.min_pstate + 1; | |
22590efb | 1043 | turbo_fp = div_fp(no_turbo, total); |
d01b1f48 | 1044 | turbo_pct = 100 - fp_toint(mul_fp(turbo_fp, int_tofp(100))); |
0c30b65b RW |
1045 | |
1046 | mutex_unlock(&intel_pstate_driver_lock); | |
1047 | ||
d01b1f48 KCA |
1048 | return sprintf(buf, "%u\n", turbo_pct); |
1049 | } | |
1050 | ||
0522424e KCA |
1051 | static ssize_t show_num_pstates(struct kobject *kobj, |
1052 | struct attribute *attr, char *buf) | |
1053 | { | |
1054 | struct cpudata *cpu; | |
1055 | int total; | |
1056 | ||
0c30b65b RW |
1057 | mutex_lock(&intel_pstate_driver_lock); |
1058 | ||
ee8df89a | 1059 | if (!intel_pstate_driver) { |
0c30b65b RW |
1060 | mutex_unlock(&intel_pstate_driver_lock); |
1061 | return -EAGAIN; | |
1062 | } | |
1063 | ||
0522424e KCA |
1064 | cpu = all_cpu_data[0]; |
1065 | total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1; | |
0c30b65b RW |
1066 | |
1067 | mutex_unlock(&intel_pstate_driver_lock); | |
1068 | ||
0522424e KCA |
1069 | return sprintf(buf, "%u\n", total); |
1070 | } | |
1071 | ||
4521e1a0 GM |
1072 | static ssize_t show_no_turbo(struct kobject *kobj, |
1073 | struct attribute *attr, char *buf) | |
1074 | { | |
1075 | ssize_t ret; | |
1076 | ||
0c30b65b RW |
1077 | mutex_lock(&intel_pstate_driver_lock); |
1078 | ||
ee8df89a | 1079 | if (!intel_pstate_driver) { |
0c30b65b RW |
1080 | mutex_unlock(&intel_pstate_driver_lock); |
1081 | return -EAGAIN; | |
1082 | } | |
1083 | ||
4521e1a0 | 1084 | update_turbo_state(); |
7de32556 RW |
1085 | if (global.turbo_disabled) |
1086 | ret = sprintf(buf, "%u\n", global.turbo_disabled); | |
4521e1a0 | 1087 | else |
7de32556 | 1088 | ret = sprintf(buf, "%u\n", global.no_turbo); |
4521e1a0 | 1089 | |
0c30b65b RW |
1090 | mutex_unlock(&intel_pstate_driver_lock); |
1091 | ||
4521e1a0 GM |
1092 | return ret; |
1093 | } | |
1094 | ||
93f0822d | 1095 | static ssize_t store_no_turbo(struct kobject *a, struct attribute *b, |
c410833a | 1096 | const char *buf, size_t count) |
93f0822d DB |
1097 | { |
1098 | unsigned int input; | |
1099 | int ret; | |
845c1cbe | 1100 | |
93f0822d DB |
1101 | ret = sscanf(buf, "%u", &input); |
1102 | if (ret != 1) | |
1103 | return -EINVAL; | |
4521e1a0 | 1104 | |
0c30b65b RW |
1105 | mutex_lock(&intel_pstate_driver_lock); |
1106 | ||
ee8df89a | 1107 | if (!intel_pstate_driver) { |
0c30b65b RW |
1108 | mutex_unlock(&intel_pstate_driver_lock); |
1109 | return -EAGAIN; | |
1110 | } | |
1111 | ||
a410c03d SP |
1112 | mutex_lock(&intel_pstate_limits_lock); |
1113 | ||
4521e1a0 | 1114 | update_turbo_state(); |
7de32556 | 1115 | if (global.turbo_disabled) { |
4836df17 | 1116 | pr_warn("Turbo disabled by BIOS or unavailable on processor\n"); |
a410c03d | 1117 | mutex_unlock(&intel_pstate_limits_lock); |
0c30b65b | 1118 | mutex_unlock(&intel_pstate_driver_lock); |
4521e1a0 | 1119 | return -EPERM; |
dd5fbf70 | 1120 | } |
2f86dc4c | 1121 | |
7de32556 | 1122 | global.no_turbo = clamp_t(int, input, 0, 1); |
111b8b3f | 1123 | |
c5a2ee7d RW |
1124 | if (global.no_turbo) { |
1125 | struct cpudata *cpu = all_cpu_data[0]; | |
1126 | int pct = cpu->pstate.max_pstate * 100 / cpu->pstate.turbo_pstate; | |
1127 | ||
1128 | /* Squash the global minimum into the permitted range. */ | |
1129 | if (global.min_perf_pct > pct) | |
1130 | global.min_perf_pct = pct; | |
1131 | } | |
1132 | ||
cd59b4be RW |
1133 | mutex_unlock(&intel_pstate_limits_lock); |
1134 | ||
7de32556 RW |
1135 | intel_pstate_update_policies(); |
1136 | ||
0c30b65b RW |
1137 | mutex_unlock(&intel_pstate_driver_lock); |
1138 | ||
93f0822d DB |
1139 | return count; |
1140 | } | |
1141 | ||
1142 | static ssize_t store_max_perf_pct(struct kobject *a, struct attribute *b, | |
c410833a | 1143 | const char *buf, size_t count) |
93f0822d DB |
1144 | { |
1145 | unsigned int input; | |
1146 | int ret; | |
845c1cbe | 1147 | |
93f0822d DB |
1148 | ret = sscanf(buf, "%u", &input); |
1149 | if (ret != 1) | |
1150 | return -EINVAL; | |
1151 | ||
0c30b65b RW |
1152 | mutex_lock(&intel_pstate_driver_lock); |
1153 | ||
ee8df89a | 1154 | if (!intel_pstate_driver) { |
0c30b65b RW |
1155 | mutex_unlock(&intel_pstate_driver_lock); |
1156 | return -EAGAIN; | |
1157 | } | |
1158 | ||
a410c03d SP |
1159 | mutex_lock(&intel_pstate_limits_lock); |
1160 | ||
c5a2ee7d | 1161 | global.max_perf_pct = clamp_t(int, input, global.min_perf_pct, 100); |
111b8b3f | 1162 | |
cd59b4be RW |
1163 | mutex_unlock(&intel_pstate_limits_lock); |
1164 | ||
7de32556 RW |
1165 | intel_pstate_update_policies(); |
1166 | ||
0c30b65b RW |
1167 | mutex_unlock(&intel_pstate_driver_lock); |
1168 | ||
93f0822d DB |
1169 | return count; |
1170 | } | |
1171 | ||
1172 | static ssize_t store_min_perf_pct(struct kobject *a, struct attribute *b, | |
c410833a | 1173 | const char *buf, size_t count) |
93f0822d DB |
1174 | { |
1175 | unsigned int input; | |
1176 | int ret; | |
845c1cbe | 1177 | |
93f0822d DB |
1178 | ret = sscanf(buf, "%u", &input); |
1179 | if (ret != 1) | |
1180 | return -EINVAL; | |
a0475992 | 1181 | |
0c30b65b RW |
1182 | mutex_lock(&intel_pstate_driver_lock); |
1183 | ||
ee8df89a | 1184 | if (!intel_pstate_driver) { |
0c30b65b RW |
1185 | mutex_unlock(&intel_pstate_driver_lock); |
1186 | return -EAGAIN; | |
1187 | } | |
1188 | ||
a410c03d SP |
1189 | mutex_lock(&intel_pstate_limits_lock); |
1190 | ||
c5a2ee7d RW |
1191 | global.min_perf_pct = clamp_t(int, input, |
1192 | min_perf_pct_min(), global.max_perf_pct); | |
111b8b3f | 1193 | |
cd59b4be RW |
1194 | mutex_unlock(&intel_pstate_limits_lock); |
1195 | ||
7de32556 RW |
1196 | intel_pstate_update_policies(); |
1197 | ||
0c30b65b RW |
1198 | mutex_unlock(&intel_pstate_driver_lock); |
1199 | ||
93f0822d DB |
1200 | return count; |
1201 | } | |
1202 | ||
93f0822d DB |
1203 | show_one(max_perf_pct, max_perf_pct); |
1204 | show_one(min_perf_pct, min_perf_pct); | |
1205 | ||
fb1fe104 | 1206 | define_one_global_rw(status); |
93f0822d DB |
1207 | define_one_global_rw(no_turbo); |
1208 | define_one_global_rw(max_perf_pct); | |
1209 | define_one_global_rw(min_perf_pct); | |
d01b1f48 | 1210 | define_one_global_ro(turbo_pct); |
0522424e | 1211 | define_one_global_ro(num_pstates); |
93f0822d DB |
1212 | |
1213 | static struct attribute *intel_pstate_attributes[] = { | |
fb1fe104 | 1214 | &status.attr, |
93f0822d | 1215 | &no_turbo.attr, |
d01b1f48 | 1216 | &turbo_pct.attr, |
0522424e | 1217 | &num_pstates.attr, |
93f0822d DB |
1218 | NULL |
1219 | }; | |
1220 | ||
1221 | static struct attribute_group intel_pstate_attr_group = { | |
1222 | .attrs = intel_pstate_attributes, | |
1223 | }; | |
93f0822d | 1224 | |
317dd50e | 1225 | static void __init intel_pstate_sysfs_expose_params(void) |
93f0822d | 1226 | { |
317dd50e | 1227 | struct kobject *intel_pstate_kobject; |
93f0822d DB |
1228 | int rc; |
1229 | ||
1230 | intel_pstate_kobject = kobject_create_and_add("intel_pstate", | |
1231 | &cpu_subsys.dev_root->kobj); | |
eae48f04 SP |
1232 | if (WARN_ON(!intel_pstate_kobject)) |
1233 | return; | |
1234 | ||
2d8d1f18 | 1235 | rc = sysfs_create_group(intel_pstate_kobject, &intel_pstate_attr_group); |
eae48f04 SP |
1236 | if (WARN_ON(rc)) |
1237 | return; | |
1238 | ||
1239 | /* | |
1240 | * If per cpu limits are enforced there are no global limits, so | |
1241 | * return without creating max/min_perf_pct attributes | |
1242 | */ | |
1243 | if (per_cpu_limits) | |
1244 | return; | |
1245 | ||
1246 | rc = sysfs_create_file(intel_pstate_kobject, &max_perf_pct.attr); | |
1247 | WARN_ON(rc); | |
1248 | ||
1249 | rc = sysfs_create_file(intel_pstate_kobject, &min_perf_pct.attr); | |
1250 | WARN_ON(rc); | |
1251 | ||
93f0822d | 1252 | } |
93f0822d | 1253 | /************************** sysfs end ************************/ |
2f86dc4c | 1254 | |
ba88d433 | 1255 | static void intel_pstate_hwp_enable(struct cpudata *cpudata) |
2f86dc4c | 1256 | { |
f05c9665 | 1257 | /* First disable HWP notification interrupt as we don't process them */ |
da7de91c SP |
1258 | if (static_cpu_has(X86_FEATURE_HWP_NOTIFY)) |
1259 | wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x00); | |
f05c9665 | 1260 | |
ba88d433 | 1261 | wrmsrl_on_cpu(cpudata->cpu, MSR_PM_ENABLE, 0x1); |
8442885f | 1262 | cpudata->epp_policy = 0; |
984edbdc SP |
1263 | if (cpudata->epp_default == -EINVAL) |
1264 | cpudata->epp_default = intel_pstate_get_epp(cpudata, 0); | |
2f86dc4c DB |
1265 | } |
1266 | ||
6e978b22 SP |
1267 | #define MSR_IA32_POWER_CTL_BIT_EE 19 |
1268 | ||
1269 | /* Disable energy efficiency optimization */ | |
1270 | static void intel_pstate_disable_ee(int cpu) | |
1271 | { | |
1272 | u64 power_ctl; | |
1273 | int ret; | |
1274 | ||
1275 | ret = rdmsrl_on_cpu(cpu, MSR_IA32_POWER_CTL, &power_ctl); | |
1276 | if (ret) | |
1277 | return; | |
1278 | ||
1279 | if (!(power_ctl & BIT(MSR_IA32_POWER_CTL_BIT_EE))) { | |
1280 | pr_info("Disabling energy efficiency optimization\n"); | |
1281 | power_ctl |= BIT(MSR_IA32_POWER_CTL_BIT_EE); | |
1282 | wrmsrl_on_cpu(cpu, MSR_IA32_POWER_CTL, power_ctl); | |
1283 | } | |
1284 | } | |
1285 | ||
938d21a2 | 1286 | static int atom_get_min_pstate(void) |
19e77c28 DB |
1287 | { |
1288 | u64 value; | |
845c1cbe | 1289 | |
92134bdb | 1290 | rdmsrl(MSR_ATOM_CORE_RATIOS, value); |
c16ed060 | 1291 | return (value >> 8) & 0x7F; |
19e77c28 DB |
1292 | } |
1293 | ||
938d21a2 | 1294 | static int atom_get_max_pstate(void) |
19e77c28 DB |
1295 | { |
1296 | u64 value; | |
845c1cbe | 1297 | |
92134bdb | 1298 | rdmsrl(MSR_ATOM_CORE_RATIOS, value); |
c16ed060 | 1299 | return (value >> 16) & 0x7F; |
19e77c28 | 1300 | } |
93f0822d | 1301 | |
938d21a2 | 1302 | static int atom_get_turbo_pstate(void) |
61d8d2ab DB |
1303 | { |
1304 | u64 value; | |
845c1cbe | 1305 | |
92134bdb | 1306 | rdmsrl(MSR_ATOM_CORE_TURBO_RATIOS, value); |
c16ed060 | 1307 | return value & 0x7F; |
61d8d2ab DB |
1308 | } |
1309 | ||
fdfdb2b1 | 1310 | static u64 atom_get_val(struct cpudata *cpudata, int pstate) |
007bea09 DB |
1311 | { |
1312 | u64 val; | |
1313 | int32_t vid_fp; | |
1314 | u32 vid; | |
1315 | ||
144c8e17 | 1316 | val = (u64)pstate << 8; |
7de32556 | 1317 | if (global.no_turbo && !global.turbo_disabled) |
007bea09 DB |
1318 | val |= (u64)1 << 32; |
1319 | ||
1320 | vid_fp = cpudata->vid.min + mul_fp( | |
1321 | int_tofp(pstate - cpudata->pstate.min_pstate), | |
1322 | cpudata->vid.ratio); | |
1323 | ||
1324 | vid_fp = clamp_t(int32_t, vid_fp, cpudata->vid.min, cpudata->vid.max); | |
d022a65e | 1325 | vid = ceiling_fp(vid_fp); |
007bea09 | 1326 | |
21855ff5 DB |
1327 | if (pstate > cpudata->pstate.max_pstate) |
1328 | vid = cpudata->vid.turbo; | |
1329 | ||
fdfdb2b1 | 1330 | return val | vid; |
007bea09 DB |
1331 | } |
1332 | ||
1421df63 | 1333 | static int silvermont_get_scaling(void) |
b27580b0 DB |
1334 | { |
1335 | u64 value; | |
1336 | int i; | |
1421df63 PL |
1337 | /* Defined in Table 35-6 from SDM (Sept 2015) */ |
1338 | static int silvermont_freq_table[] = { | |
1339 | 83300, 100000, 133300, 116700, 80000}; | |
b27580b0 DB |
1340 | |
1341 | rdmsrl(MSR_FSB_FREQ, value); | |
1421df63 PL |
1342 | i = value & 0x7; |
1343 | WARN_ON(i > 4); | |
b27580b0 | 1344 | |
1421df63 PL |
1345 | return silvermont_freq_table[i]; |
1346 | } | |
b27580b0 | 1347 | |
1421df63 PL |
1348 | static int airmont_get_scaling(void) |
1349 | { | |
1350 | u64 value; | |
1351 | int i; | |
1352 | /* Defined in Table 35-10 from SDM (Sept 2015) */ | |
1353 | static int airmont_freq_table[] = { | |
1354 | 83300, 100000, 133300, 116700, 80000, | |
1355 | 93300, 90000, 88900, 87500}; | |
1356 | ||
1357 | rdmsrl(MSR_FSB_FREQ, value); | |
1358 | i = value & 0xF; | |
1359 | WARN_ON(i > 8); | |
1360 | ||
1361 | return airmont_freq_table[i]; | |
b27580b0 DB |
1362 | } |
1363 | ||
938d21a2 | 1364 | static void atom_get_vid(struct cpudata *cpudata) |
007bea09 DB |
1365 | { |
1366 | u64 value; | |
1367 | ||
92134bdb | 1368 | rdmsrl(MSR_ATOM_CORE_VIDS, value); |
c16ed060 DB |
1369 | cpudata->vid.min = int_tofp((value >> 8) & 0x7f); |
1370 | cpudata->vid.max = int_tofp((value >> 16) & 0x7f); | |
007bea09 DB |
1371 | cpudata->vid.ratio = div_fp( |
1372 | cpudata->vid.max - cpudata->vid.min, | |
1373 | int_tofp(cpudata->pstate.max_pstate - | |
1374 | cpudata->pstate.min_pstate)); | |
21855ff5 | 1375 | |
92134bdb | 1376 | rdmsrl(MSR_ATOM_CORE_TURBO_VIDS, value); |
21855ff5 | 1377 | cpudata->vid.turbo = value & 0x7f; |
007bea09 DB |
1378 | } |
1379 | ||
016c8150 | 1380 | static int core_get_min_pstate(void) |
93f0822d DB |
1381 | { |
1382 | u64 value; | |
845c1cbe | 1383 | |
05e99c8c | 1384 | rdmsrl(MSR_PLATFORM_INFO, value); |
93f0822d DB |
1385 | return (value >> 40) & 0xFF; |
1386 | } | |
1387 | ||
3bcc6fa9 | 1388 | static int core_get_max_pstate_physical(void) |
93f0822d DB |
1389 | { |
1390 | u64 value; | |
845c1cbe | 1391 | |
05e99c8c | 1392 | rdmsrl(MSR_PLATFORM_INFO, value); |
93f0822d DB |
1393 | return (value >> 8) & 0xFF; |
1394 | } | |
1395 | ||
8fc7554a SP |
1396 | static int core_get_tdp_ratio(u64 plat_info) |
1397 | { | |
1398 | /* Check how many TDP levels present */ | |
1399 | if (plat_info & 0x600000000) { | |
1400 | u64 tdp_ctrl; | |
1401 | u64 tdp_ratio; | |
1402 | int tdp_msr; | |
1403 | int err; | |
1404 | ||
1405 | /* Get the TDP level (0, 1, 2) to get ratios */ | |
1406 | err = rdmsrl_safe(MSR_CONFIG_TDP_CONTROL, &tdp_ctrl); | |
1407 | if (err) | |
1408 | return err; | |
1409 | ||
1410 | /* TDP MSR are continuous starting at 0x648 */ | |
1411 | tdp_msr = MSR_CONFIG_TDP_NOMINAL + (tdp_ctrl & 0x03); | |
1412 | err = rdmsrl_safe(tdp_msr, &tdp_ratio); | |
1413 | if (err) | |
1414 | return err; | |
1415 | ||
1416 | /* For level 1 and 2, bits[23:16] contain the ratio */ | |
1417 | if (tdp_ctrl & 0x03) | |
1418 | tdp_ratio >>= 16; | |
1419 | ||
1420 | tdp_ratio &= 0xff; /* ratios are only 8 bits long */ | |
1421 | pr_debug("tdp_ratio %x\n", (int)tdp_ratio); | |
1422 | ||
1423 | return (int)tdp_ratio; | |
1424 | } | |
1425 | ||
1426 | return -ENXIO; | |
1427 | } | |
1428 | ||
016c8150 | 1429 | static int core_get_max_pstate(void) |
93f0822d | 1430 | { |
6a35fc2d SP |
1431 | u64 tar; |
1432 | u64 plat_info; | |
1433 | int max_pstate; | |
8fc7554a | 1434 | int tdp_ratio; |
6a35fc2d SP |
1435 | int err; |
1436 | ||
1437 | rdmsrl(MSR_PLATFORM_INFO, plat_info); | |
1438 | max_pstate = (plat_info >> 8) & 0xFF; | |
1439 | ||
8fc7554a SP |
1440 | tdp_ratio = core_get_tdp_ratio(plat_info); |
1441 | if (tdp_ratio <= 0) | |
1442 | return max_pstate; | |
1443 | ||
1444 | if (hwp_active) { | |
1445 | /* Turbo activation ratio is not used on HWP platforms */ | |
1446 | return tdp_ratio; | |
1447 | } | |
1448 | ||
6a35fc2d SP |
1449 | err = rdmsrl_safe(MSR_TURBO_ACTIVATION_RATIO, &tar); |
1450 | if (!err) { | |
8fc7554a SP |
1451 | int tar_levels; |
1452 | ||
6a35fc2d | 1453 | /* Do some sanity checking for safety */ |
8fc7554a SP |
1454 | tar_levels = tar & 0xff; |
1455 | if (tdp_ratio - 1 == tar_levels) { | |
1456 | max_pstate = tar_levels; | |
1457 | pr_debug("max_pstate=TAC %x\n", max_pstate); | |
6a35fc2d SP |
1458 | } |
1459 | } | |
845c1cbe | 1460 | |
6a35fc2d | 1461 | return max_pstate; |
93f0822d DB |
1462 | } |
1463 | ||
016c8150 | 1464 | static int core_get_turbo_pstate(void) |
93f0822d DB |
1465 | { |
1466 | u64 value; | |
1467 | int nont, ret; | |
845c1cbe | 1468 | |
100cf6f2 | 1469 | rdmsrl(MSR_TURBO_RATIO_LIMIT, value); |
016c8150 | 1470 | nont = core_get_max_pstate(); |
285cb990 | 1471 | ret = (value) & 255; |
93f0822d DB |
1472 | if (ret <= nont) |
1473 | ret = nont; | |
1474 | return ret; | |
1475 | } | |
1476 | ||
b27580b0 DB |
1477 | static inline int core_get_scaling(void) |
1478 | { | |
1479 | return 100000; | |
1480 | } | |
1481 | ||
fdfdb2b1 | 1482 | static u64 core_get_val(struct cpudata *cpudata, int pstate) |
016c8150 DB |
1483 | { |
1484 | u64 val; | |
1485 | ||
144c8e17 | 1486 | val = (u64)pstate << 8; |
7de32556 | 1487 | if (global.no_turbo && !global.turbo_disabled) |
016c8150 DB |
1488 | val |= (u64)1 << 32; |
1489 | ||
fdfdb2b1 | 1490 | return val; |
016c8150 DB |
1491 | } |
1492 | ||
b34ef932 DC |
1493 | static int knl_get_turbo_pstate(void) |
1494 | { | |
1495 | u64 value; | |
1496 | int nont, ret; | |
1497 | ||
100cf6f2 | 1498 | rdmsrl(MSR_TURBO_RATIO_LIMIT, value); |
b34ef932 DC |
1499 | nont = core_get_max_pstate(); |
1500 | ret = (((value) >> 8) & 0xFF); | |
1501 | if (ret <= nont) | |
1502 | ret = nont; | |
1503 | return ret; | |
1504 | } | |
1505 | ||
b02aabe8 | 1506 | static int intel_pstate_get_base_pstate(struct cpudata *cpu) |
93f0822d | 1507 | { |
b02aabe8 RW |
1508 | return global.no_turbo || global.turbo_disabled ? |
1509 | cpu->pstate.max_pstate : cpu->pstate.turbo_pstate; | |
93f0822d DB |
1510 | } |
1511 | ||
a6c6ead1 | 1512 | static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate) |
fdfdb2b1 | 1513 | { |
bc95a454 RW |
1514 | trace_cpu_frequency(pstate * cpu->pstate.scaling, cpu->cpu); |
1515 | cpu->pstate.current_pstate = pstate; | |
fdfdb2b1 RW |
1516 | /* |
1517 | * Generally, there is no guarantee that this code will always run on | |
1518 | * the CPU being updated, so force the register update to run on the | |
1519 | * right CPU. | |
1520 | */ | |
1521 | wrmsrl_on_cpu(cpu->cpu, MSR_IA32_PERF_CTL, | |
1522 | pstate_funcs.get_val(cpu, pstate)); | |
93f0822d DB |
1523 | } |
1524 | ||
a6c6ead1 RW |
1525 | static void intel_pstate_set_min_pstate(struct cpudata *cpu) |
1526 | { | |
1527 | intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate); | |
1528 | } | |
1529 | ||
1530 | static void intel_pstate_max_within_limits(struct cpudata *cpu) | |
1531 | { | |
b02aabe8 | 1532 | int pstate; |
a6c6ead1 RW |
1533 | |
1534 | update_turbo_state(); | |
b02aabe8 | 1535 | pstate = intel_pstate_get_base_pstate(cpu); |
1a4fe38a | 1536 | pstate = max(cpu->pstate.min_pstate, cpu->max_perf_ratio); |
b02aabe8 | 1537 | intel_pstate_set_pstate(cpu, pstate); |
a6c6ead1 RW |
1538 | } |
1539 | ||
93f0822d DB |
1540 | static void intel_pstate_get_cpu_pstates(struct cpudata *cpu) |
1541 | { | |
016c8150 DB |
1542 | cpu->pstate.min_pstate = pstate_funcs.get_min(); |
1543 | cpu->pstate.max_pstate = pstate_funcs.get_max(); | |
3bcc6fa9 | 1544 | cpu->pstate.max_pstate_physical = pstate_funcs.get_max_physical(); |
016c8150 | 1545 | cpu->pstate.turbo_pstate = pstate_funcs.get_turbo(); |
b27580b0 | 1546 | cpu->pstate.scaling = pstate_funcs.get_scaling(); |
001c76f0 RW |
1547 | cpu->pstate.max_freq = cpu->pstate.max_pstate * cpu->pstate.scaling; |
1548 | cpu->pstate.turbo_freq = cpu->pstate.turbo_pstate * cpu->pstate.scaling; | |
93f0822d | 1549 | |
007bea09 DB |
1550 | if (pstate_funcs.get_vid) |
1551 | pstate_funcs.get_vid(cpu); | |
fdfdb2b1 RW |
1552 | |
1553 | intel_pstate_set_min_pstate(cpu); | |
93f0822d DB |
1554 | } |
1555 | ||
a1c9787d | 1556 | static inline void intel_pstate_calc_avg_perf(struct cpudata *cpu) |
93f0822d | 1557 | { |
6b17ddb2 | 1558 | struct sample *sample = &cpu->sample; |
e66c1768 | 1559 | |
a1c9787d | 1560 | sample->core_avg_perf = div_ext_fp(sample->aperf, sample->mperf); |
93f0822d DB |
1561 | } |
1562 | ||
4fec7ad5 | 1563 | static inline bool intel_pstate_sample(struct cpudata *cpu, u64 time) |
93f0822d | 1564 | { |
93f0822d | 1565 | u64 aperf, mperf; |
4ab60c3f | 1566 | unsigned long flags; |
4055fad3 | 1567 | u64 tsc; |
93f0822d | 1568 | |
4ab60c3f | 1569 | local_irq_save(flags); |
93f0822d DB |
1570 | rdmsrl(MSR_IA32_APERF, aperf); |
1571 | rdmsrl(MSR_IA32_MPERF, mperf); | |
e70eed2b | 1572 | tsc = rdtsc(); |
4fec7ad5 | 1573 | if (cpu->prev_mperf == mperf || cpu->prev_tsc == tsc) { |
8e601a9f | 1574 | local_irq_restore(flags); |
4fec7ad5 | 1575 | return false; |
8e601a9f | 1576 | } |
4ab60c3f | 1577 | local_irq_restore(flags); |
b69880f9 | 1578 | |
c4ee841f | 1579 | cpu->last_sample_time = cpu->sample.time; |
a4675fbc | 1580 | cpu->sample.time = time; |
d37e2b76 DB |
1581 | cpu->sample.aperf = aperf; |
1582 | cpu->sample.mperf = mperf; | |
4055fad3 | 1583 | cpu->sample.tsc = tsc; |
d37e2b76 DB |
1584 | cpu->sample.aperf -= cpu->prev_aperf; |
1585 | cpu->sample.mperf -= cpu->prev_mperf; | |
4055fad3 | 1586 | cpu->sample.tsc -= cpu->prev_tsc; |
1abc4b20 | 1587 | |
93f0822d DB |
1588 | cpu->prev_aperf = aperf; |
1589 | cpu->prev_mperf = mperf; | |
4055fad3 | 1590 | cpu->prev_tsc = tsc; |
febce40f RW |
1591 | /* |
1592 | * First time this function is invoked in a given cycle, all of the | |
1593 | * previous sample data fields are equal to zero or stale and they must | |
1594 | * be populated with meaningful numbers for things to work, so assume | |
1595 | * that sample.time will always be reset before setting the utilization | |
1596 | * update hook and make the caller skip the sample then. | |
1597 | */ | |
eabd22c6 RW |
1598 | if (cpu->last_sample_time) { |
1599 | intel_pstate_calc_avg_perf(cpu); | |
1600 | return true; | |
1601 | } | |
1602 | return false; | |
93f0822d DB |
1603 | } |
1604 | ||
8fa520af PL |
1605 | static inline int32_t get_avg_frequency(struct cpudata *cpu) |
1606 | { | |
a1c9787d RW |
1607 | return mul_ext_fp(cpu->sample.core_avg_perf, |
1608 | cpu->pstate.max_pstate_physical * cpu->pstate.scaling); | |
8fa520af PL |
1609 | } |
1610 | ||
bdcaa23f PL |
1611 | static inline int32_t get_avg_pstate(struct cpudata *cpu) |
1612 | { | |
8edb0a6e RW |
1613 | return mul_ext_fp(cpu->pstate.max_pstate_physical, |
1614 | cpu->sample.core_avg_perf); | |
bdcaa23f PL |
1615 | } |
1616 | ||
e70eed2b PL |
1617 | static inline int32_t get_target_pstate_use_cpu_load(struct cpudata *cpu) |
1618 | { | |
1619 | struct sample *sample = &cpu->sample; | |
09c448d3 | 1620 | int32_t busy_frac, boost; |
0843e83c | 1621 | int target, avg_pstate; |
e70eed2b | 1622 | |
09c448d3 | 1623 | busy_frac = div_fp(sample->mperf, sample->tsc); |
63d1d656 | 1624 | |
09c448d3 RW |
1625 | boost = cpu->iowait_boost; |
1626 | cpu->iowait_boost >>= 1; | |
63d1d656 | 1627 | |
09c448d3 RW |
1628 | if (busy_frac < boost) |
1629 | busy_frac = boost; | |
63d1d656 | 1630 | |
09c448d3 | 1631 | sample->busy_scaled = busy_frac * 100; |
0843e83c | 1632 | |
7de32556 | 1633 | target = global.no_turbo || global.turbo_disabled ? |
0843e83c RW |
1634 | cpu->pstate.max_pstate : cpu->pstate.turbo_pstate; |
1635 | target += target >> 2; | |
1636 | target = mul_fp(target, busy_frac); | |
1637 | if (target < cpu->pstate.min_pstate) | |
1638 | target = cpu->pstate.min_pstate; | |
1639 | ||
1640 | /* | |
1641 | * If the average P-state during the previous cycle was higher than the | |
1642 | * current target, add 50% of the difference to the target to reduce | |
1643 | * possible performance oscillations and offset possible performance | |
1644 | * loss related to moving the workload from one CPU to another within | |
1645 | * a package/module. | |
1646 | */ | |
1647 | avg_pstate = get_avg_pstate(cpu); | |
1648 | if (avg_pstate > target) | |
1649 | target += (avg_pstate - target) >> 1; | |
1650 | ||
1651 | return target; | |
e70eed2b PL |
1652 | } |
1653 | ||
157386b6 | 1654 | static inline int32_t get_target_pstate_use_performance(struct cpudata *cpu) |
93f0822d | 1655 | { |
1aa7a6e2 | 1656 | int32_t perf_scaled, max_pstate, current_pstate, sample_ratio; |
a4675fbc | 1657 | u64 duration_ns; |
93f0822d | 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 | |
1a4fe38a SP |
1696 | min_pstate = max(cpu->pstate.min_pstate, cpu->min_perf_ratio); |
1697 | max_pstate = max(min_pstate, cpu->max_perf_ratio); | |
b02aabe8 | 1698 | return clamp_t(int, pstate, min_pstate, max_pstate); |
001c76f0 RW |
1699 | } |
1700 | ||
1701 | static void intel_pstate_update_pstate(struct cpudata *cpu, int pstate) | |
1702 | { | |
fdfdb2b1 RW |
1703 | if (pstate == cpu->pstate.current_pstate) |
1704 | return; | |
1705 | ||
bc95a454 | 1706 | cpu->pstate.current_pstate = pstate; |
fdfdb2b1 RW |
1707 | wrmsrl(MSR_IA32_PERF_CTL, pstate_funcs.get_val(cpu, pstate)); |
1708 | } | |
1709 | ||
67dd9bf4 | 1710 | static void intel_pstate_adjust_pstate(struct cpudata *cpu, int target_pstate) |
93f0822d | 1711 | { |
67dd9bf4 | 1712 | int from = cpu->pstate.current_pstate; |
4055fad3 DS |
1713 | struct sample *sample; |
1714 | ||
001c76f0 RW |
1715 | update_turbo_state(); |
1716 | ||
64078299 RW |
1717 | target_pstate = intel_pstate_prepare_request(cpu, target_pstate); |
1718 | trace_cpu_frequency(target_pstate * cpu->pstate.scaling, cpu->cpu); | |
fdfdb2b1 | 1719 | intel_pstate_update_pstate(cpu, target_pstate); |
4055fad3 DS |
1720 | |
1721 | sample = &cpu->sample; | |
a1c9787d | 1722 | trace_pstate_sample(mul_ext_fp(100, sample->core_avg_perf), |
157386b6 | 1723 | fp_toint(sample->busy_scaled), |
4055fad3 DS |
1724 | from, |
1725 | cpu->pstate.current_pstate, | |
1726 | sample->mperf, | |
1727 | sample->aperf, | |
1728 | sample->tsc, | |
3ba7bcaa SP |
1729 | get_avg_frequency(cpu), |
1730 | fp_toint(cpu->iowait_boost * 100)); | |
93f0822d DB |
1731 | } |
1732 | ||
eabd22c6 RW |
1733 | static void intel_pstate_update_util_pid(struct update_util_data *data, |
1734 | u64 time, unsigned int flags) | |
1735 | { | |
1736 | struct cpudata *cpu = container_of(data, struct cpudata, update_util); | |
1737 | u64 delta_ns = time - cpu->sample.time; | |
1738 | ||
1739 | if ((s64)delta_ns < pid_params.sample_rate_ns) | |
1740 | return; | |
1741 | ||
67dd9bf4 RW |
1742 | if (intel_pstate_sample(cpu, time)) { |
1743 | int target_pstate; | |
1744 | ||
1745 | target_pstate = get_target_pstate_use_performance(cpu); | |
1746 | intel_pstate_adjust_pstate(cpu, target_pstate); | |
1747 | } | |
eabd22c6 RW |
1748 | } |
1749 | ||
a4675fbc | 1750 | static void intel_pstate_update_util(struct update_util_data *data, u64 time, |
58919e83 | 1751 | unsigned int flags) |
93f0822d | 1752 | { |
a4675fbc | 1753 | struct cpudata *cpu = container_of(data, struct cpudata, update_util); |
09c448d3 RW |
1754 | u64 delta_ns; |
1755 | ||
eabd22c6 RW |
1756 | if (flags & SCHED_CPUFREQ_IOWAIT) { |
1757 | cpu->iowait_boost = int_tofp(1); | |
1758 | } else if (cpu->iowait_boost) { | |
1759 | /* Clear iowait_boost if the CPU may have been idle. */ | |
1760 | delta_ns = time - cpu->last_update; | |
1761 | if (delta_ns > TICK_NSEC) | |
1762 | cpu->iowait_boost = 0; | |
09c448d3 | 1763 | } |
eabd22c6 | 1764 | cpu->last_update = time; |
09c448d3 | 1765 | delta_ns = time - cpu->sample.time; |
eabd22c6 RW |
1766 | if ((s64)delta_ns < INTEL_PSTATE_DEFAULT_SAMPLING_INTERVAL) |
1767 | return; | |
4fec7ad5 | 1768 | |
67dd9bf4 RW |
1769 | if (intel_pstate_sample(cpu, time)) { |
1770 | int target_pstate; | |
93f0822d | 1771 | |
67dd9bf4 RW |
1772 | target_pstate = get_target_pstate_use_cpu_load(cpu); |
1773 | intel_pstate_adjust_pstate(cpu, target_pstate); | |
1774 | } | |
1775 | } | |
eabd22c6 | 1776 | |
2f49afc2 RW |
1777 | static struct pstate_funcs core_funcs = { |
1778 | .get_max = core_get_max_pstate, | |
1779 | .get_max_physical = core_get_max_pstate_physical, | |
1780 | .get_min = core_get_min_pstate, | |
1781 | .get_turbo = core_get_turbo_pstate, | |
1782 | .get_scaling = core_get_scaling, | |
1783 | .get_val = core_get_val, | |
1784 | .update_util = intel_pstate_update_util_pid, | |
de4a76cb RW |
1785 | }; |
1786 | ||
2f49afc2 RW |
1787 | static const struct pstate_funcs silvermont_funcs = { |
1788 | .get_max = atom_get_max_pstate, | |
1789 | .get_max_physical = atom_get_max_pstate, | |
1790 | .get_min = atom_get_min_pstate, | |
1791 | .get_turbo = atom_get_turbo_pstate, | |
1792 | .get_val = atom_get_val, | |
1793 | .get_scaling = silvermont_get_scaling, | |
1794 | .get_vid = atom_get_vid, | |
1795 | .update_util = intel_pstate_update_util, | |
de4a76cb RW |
1796 | }; |
1797 | ||
2f49afc2 RW |
1798 | static const struct pstate_funcs airmont_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 = airmont_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 knl_funcs = { |
1810 | .get_max = core_get_max_pstate, | |
1811 | .get_max_physical = core_get_max_pstate_physical, | |
1812 | .get_min = core_get_min_pstate, | |
1813 | .get_turbo = knl_get_turbo_pstate, | |
1814 | .get_scaling = core_get_scaling, | |
1815 | .get_val = core_get_val, | |
1816 | .update_util = intel_pstate_update_util_pid, | |
de4a76cb RW |
1817 | }; |
1818 | ||
2f49afc2 RW |
1819 | static const struct pstate_funcs bxt_funcs = { |
1820 | .get_max = core_get_max_pstate, | |
1821 | .get_max_physical = core_get_max_pstate_physical, | |
1822 | .get_min = core_get_min_pstate, | |
1823 | .get_turbo = core_get_turbo_pstate, | |
1824 | .get_scaling = core_get_scaling, | |
1825 | .get_val = core_get_val, | |
1826 | .update_util = intel_pstate_update_util, | |
de4a76cb RW |
1827 | }; |
1828 | ||
93f0822d | 1829 | #define ICPU(model, policy) \ |
6cbd7ee1 DB |
1830 | { X86_VENDOR_INTEL, 6, model, X86_FEATURE_APERFMPERF,\ |
1831 | (unsigned long)&policy } | |
93f0822d DB |
1832 | |
1833 | static const struct x86_cpu_id intel_pstate_cpu_ids[] = { | |
2f49afc2 RW |
1834 | ICPU(INTEL_FAM6_SANDYBRIDGE, core_funcs), |
1835 | ICPU(INTEL_FAM6_SANDYBRIDGE_X, core_funcs), | |
1836 | ICPU(INTEL_FAM6_ATOM_SILVERMONT1, silvermont_funcs), | |
1837 | ICPU(INTEL_FAM6_IVYBRIDGE, core_funcs), | |
1838 | ICPU(INTEL_FAM6_HASWELL_CORE, core_funcs), | |
1839 | ICPU(INTEL_FAM6_BROADWELL_CORE, core_funcs), | |
1840 | ICPU(INTEL_FAM6_IVYBRIDGE_X, core_funcs), | |
1841 | ICPU(INTEL_FAM6_HASWELL_X, core_funcs), | |
1842 | ICPU(INTEL_FAM6_HASWELL_ULT, core_funcs), | |
1843 | ICPU(INTEL_FAM6_HASWELL_GT3E, core_funcs), | |
1844 | ICPU(INTEL_FAM6_BROADWELL_GT3E, core_funcs), | |
1845 | ICPU(INTEL_FAM6_ATOM_AIRMONT, airmont_funcs), | |
1846 | ICPU(INTEL_FAM6_SKYLAKE_MOBILE, core_funcs), | |
1847 | ICPU(INTEL_FAM6_BROADWELL_X, core_funcs), | |
1848 | ICPU(INTEL_FAM6_SKYLAKE_DESKTOP, core_funcs), | |
1849 | ICPU(INTEL_FAM6_BROADWELL_XEON_D, core_funcs), | |
1850 | ICPU(INTEL_FAM6_XEON_PHI_KNL, knl_funcs), | |
1851 | ICPU(INTEL_FAM6_XEON_PHI_KNM, knl_funcs), | |
1852 | ICPU(INTEL_FAM6_ATOM_GOLDMONT, bxt_funcs), | |
630e5757 | 1853 | ICPU(INTEL_FAM6_ATOM_GEMINI_LAKE, bxt_funcs), |
93f0822d DB |
1854 | {} |
1855 | }; | |
1856 | MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids); | |
1857 | ||
29327c84 | 1858 | static const struct x86_cpu_id intel_pstate_cpu_oob_ids[] __initconst = { |
2f49afc2 RW |
1859 | ICPU(INTEL_FAM6_BROADWELL_XEON_D, core_funcs), |
1860 | ICPU(INTEL_FAM6_BROADWELL_X, core_funcs), | |
1861 | ICPU(INTEL_FAM6_SKYLAKE_X, core_funcs), | |
2f86dc4c DB |
1862 | {} |
1863 | }; | |
1864 | ||
6e978b22 | 1865 | static const struct x86_cpu_id intel_pstate_cpu_ee_disable_ids[] = { |
2f49afc2 | 1866 | ICPU(INTEL_FAM6_KABYLAKE_DESKTOP, core_funcs), |
6e978b22 SP |
1867 | {} |
1868 | }; | |
1869 | ||
8ca6ce37 RW |
1870 | static bool pid_in_use(void); |
1871 | ||
93f0822d DB |
1872 | static int intel_pstate_init_cpu(unsigned int cpunum) |
1873 | { | |
93f0822d DB |
1874 | struct cpudata *cpu; |
1875 | ||
eae48f04 SP |
1876 | cpu = all_cpu_data[cpunum]; |
1877 | ||
1878 | if (!cpu) { | |
c5a2ee7d | 1879 | cpu = kzalloc(sizeof(*cpu), GFP_KERNEL); |
eae48f04 SP |
1880 | if (!cpu) |
1881 | return -ENOMEM; | |
1882 | ||
1883 | all_cpu_data[cpunum] = cpu; | |
eae48f04 | 1884 | |
984edbdc SP |
1885 | cpu->epp_default = -EINVAL; |
1886 | cpu->epp_powersave = -EINVAL; | |
1887 | cpu->epp_saved = -EINVAL; | |
eae48f04 | 1888 | } |
93f0822d DB |
1889 | |
1890 | cpu = all_cpu_data[cpunum]; | |
1891 | ||
93f0822d | 1892 | cpu->cpu = cpunum; |
ba88d433 | 1893 | |
a4675fbc | 1894 | if (hwp_active) { |
6e978b22 SP |
1895 | const struct x86_cpu_id *id; |
1896 | ||
1897 | id = x86_match_cpu(intel_pstate_cpu_ee_disable_ids); | |
1898 | if (id) | |
1899 | intel_pstate_disable_ee(cpunum); | |
1900 | ||
ba88d433 | 1901 | intel_pstate_hwp_enable(cpu); |
8ca6ce37 | 1902 | } else if (pid_in_use()) { |
694cb173 | 1903 | intel_pstate_pid_reset(cpu); |
a4675fbc | 1904 | } |
ba88d433 | 1905 | |
179e8471 | 1906 | intel_pstate_get_cpu_pstates(cpu); |
016c8150 | 1907 | |
4836df17 | 1908 | pr_debug("controlling: cpu %d\n", cpunum); |
93f0822d DB |
1909 | |
1910 | return 0; | |
1911 | } | |
1912 | ||
1913 | static unsigned int intel_pstate_get(unsigned int cpu_num) | |
1914 | { | |
f96fd0c8 | 1915 | struct cpudata *cpu = all_cpu_data[cpu_num]; |
93f0822d | 1916 | |
f96fd0c8 | 1917 | return cpu ? get_avg_frequency(cpu) : 0; |
93f0822d DB |
1918 | } |
1919 | ||
febce40f | 1920 | static void intel_pstate_set_update_util_hook(unsigned int cpu_num) |
bb6ab52f | 1921 | { |
febce40f RW |
1922 | struct cpudata *cpu = all_cpu_data[cpu_num]; |
1923 | ||
62611cb9 LB |
1924 | if (hwp_active) |
1925 | return; | |
1926 | ||
5ab666e0 RW |
1927 | if (cpu->update_util_set) |
1928 | return; | |
1929 | ||
febce40f RW |
1930 | /* Prevent intel_pstate_update_util() from using stale data. */ |
1931 | cpu->sample.time = 0; | |
67dd9bf4 RW |
1932 | cpufreq_add_update_util_hook(cpu_num, &cpu->update_util, |
1933 | pstate_funcs.update_util); | |
4578ee7e | 1934 | cpu->update_util_set = true; |
bb6ab52f RW |
1935 | } |
1936 | ||
1937 | static void intel_pstate_clear_update_util_hook(unsigned int cpu) | |
1938 | { | |
4578ee7e CY |
1939 | struct cpudata *cpu_data = all_cpu_data[cpu]; |
1940 | ||
1941 | if (!cpu_data->update_util_set) | |
1942 | return; | |
1943 | ||
0bed612b | 1944 | cpufreq_remove_update_util_hook(cpu); |
4578ee7e | 1945 | cpu_data->update_util_set = false; |
bb6ab52f RW |
1946 | synchronize_sched(); |
1947 | } | |
1948 | ||
80b120ca RW |
1949 | static int intel_pstate_get_max_freq(struct cpudata *cpu) |
1950 | { | |
1951 | return global.turbo_disabled || global.no_turbo ? | |
1952 | cpu->pstate.max_freq : cpu->pstate.turbo_freq; | |
1953 | } | |
1954 | ||
eae48f04 | 1955 | static void intel_pstate_update_perf_limits(struct cpufreq_policy *policy, |
c5a2ee7d | 1956 | struct cpudata *cpu) |
eae48f04 | 1957 | { |
80b120ca | 1958 | int max_freq = intel_pstate_get_max_freq(cpu); |
e4c204ce | 1959 | int32_t max_policy_perf, min_policy_perf; |
1a4fe38a | 1960 | int max_state, turbo_max; |
a410c03d | 1961 | |
1a4fe38a SP |
1962 | /* |
1963 | * HWP needs some special consideration, because on BDX the | |
1964 | * HWP_REQUEST uses abstract value to represent performance | |
1965 | * rather than pure ratios. | |
1966 | */ | |
1967 | if (hwp_active) { | |
1968 | intel_pstate_get_hwp_max(cpu->cpu, &turbo_max, &max_state); | |
1969 | } else { | |
1970 | max_state = intel_pstate_get_base_pstate(cpu); | |
1971 | turbo_max = cpu->pstate.turbo_pstate; | |
1972 | } | |
1973 | ||
1974 | max_policy_perf = max_state * policy->max / max_freq; | |
5879f877 | 1975 | if (policy->max == policy->min) { |
e4c204ce | 1976 | min_policy_perf = max_policy_perf; |
5879f877 | 1977 | } else { |
1a4fe38a | 1978 | min_policy_perf = max_state * policy->min / max_freq; |
e4c204ce RW |
1979 | min_policy_perf = clamp_t(int32_t, min_policy_perf, |
1980 | 0, max_policy_perf); | |
5879f877 | 1981 | } |
eae48f04 | 1982 | |
1a4fe38a SP |
1983 | pr_debug("cpu:%d max_state %d min_policy_perf:%d max_policy_perf:%d\n", |
1984 | policy->cpu, max_state, | |
1985 | min_policy_perf, max_policy_perf); | |
1986 | ||
e4c204ce | 1987 | /* Normalize user input to [min_perf, max_perf] */ |
c5a2ee7d | 1988 | if (per_cpu_limits) { |
1a4fe38a SP |
1989 | cpu->min_perf_ratio = min_policy_perf; |
1990 | cpu->max_perf_ratio = max_policy_perf; | |
c5a2ee7d RW |
1991 | } else { |
1992 | int32_t global_min, global_max; | |
1993 | ||
1994 | /* Global limits are in percent of the maximum turbo P-state. */ | |
1a4fe38a SP |
1995 | global_max = DIV_ROUND_UP(turbo_max * global.max_perf_pct, 100); |
1996 | global_min = DIV_ROUND_UP(turbo_max * global.min_perf_pct, 100); | |
c5a2ee7d | 1997 | global_min = clamp_t(int32_t, global_min, 0, global_max); |
eae48f04 | 1998 | |
1a4fe38a SP |
1999 | pr_debug("cpu:%d global_min:%d global_max:%d\n", policy->cpu, |
2000 | global_min, global_max); | |
c5a2ee7d | 2001 | |
1a4fe38a SP |
2002 | cpu->min_perf_ratio = max(min_policy_perf, global_min); |
2003 | cpu->min_perf_ratio = min(cpu->min_perf_ratio, max_policy_perf); | |
2004 | cpu->max_perf_ratio = min(max_policy_perf, global_max); | |
2005 | cpu->max_perf_ratio = max(min_policy_perf, cpu->max_perf_ratio); | |
eae48f04 | 2006 | |
1a4fe38a SP |
2007 | /* Make sure min_perf <= max_perf */ |
2008 | cpu->min_perf_ratio = min(cpu->min_perf_ratio, | |
2009 | cpu->max_perf_ratio); | |
eae48f04 | 2010 | |
1a4fe38a SP |
2011 | } |
2012 | pr_debug("cpu:%d max_perf_ratio:%d min_perf_ratio:%d\n", policy->cpu, | |
2013 | cpu->max_perf_ratio, | |
2014 | cpu->min_perf_ratio); | |
eae48f04 SP |
2015 | } |
2016 | ||
93f0822d DB |
2017 | static int intel_pstate_set_policy(struct cpufreq_policy *policy) |
2018 | { | |
3be9200d SP |
2019 | struct cpudata *cpu; |
2020 | ||
d3929b83 DB |
2021 | if (!policy->cpuinfo.max_freq) |
2022 | return -ENODEV; | |
2023 | ||
2c2c1af4 SP |
2024 | pr_debug("set_policy cpuinfo.max %u policy->max %u\n", |
2025 | policy->cpuinfo.max_freq, policy->max); | |
2026 | ||
a6c6ead1 | 2027 | cpu = all_cpu_data[policy->cpu]; |
2f1d407a RW |
2028 | cpu->policy = policy->policy; |
2029 | ||
b59fe540 SP |
2030 | mutex_lock(&intel_pstate_limits_lock); |
2031 | ||
c5a2ee7d | 2032 | intel_pstate_update_perf_limits(policy, cpu); |
a240c4aa | 2033 | |
2f1d407a | 2034 | if (cpu->policy == CPUFREQ_POLICY_PERFORMANCE) { |
a6c6ead1 RW |
2035 | /* |
2036 | * NOHZ_FULL CPUs need this as the governor callback may not | |
2037 | * be invoked on them. | |
2038 | */ | |
2039 | intel_pstate_clear_update_util_hook(policy->cpu); | |
2040 | intel_pstate_max_within_limits(cpu); | |
82b4e03e LB |
2041 | } else { |
2042 | intel_pstate_set_update_util_hook(policy->cpu); | |
a6c6ead1 RW |
2043 | } |
2044 | ||
5f98ced1 | 2045 | if (hwp_active) |
2bfc4cbb | 2046 | intel_pstate_hwp_set(policy->cpu); |
2f86dc4c | 2047 | |
b59fe540 SP |
2048 | mutex_unlock(&intel_pstate_limits_lock); |
2049 | ||
93f0822d DB |
2050 | return 0; |
2051 | } | |
2052 | ||
80b120ca RW |
2053 | static void intel_pstate_adjust_policy_max(struct cpufreq_policy *policy, |
2054 | struct cpudata *cpu) | |
2055 | { | |
2056 | if (cpu->pstate.max_pstate_physical > cpu->pstate.max_pstate && | |
2057 | policy->max < policy->cpuinfo.max_freq && | |
2058 | policy->max > cpu->pstate.max_freq) { | |
2059 | pr_debug("policy->max > max non turbo frequency\n"); | |
2060 | policy->max = policy->cpuinfo.max_freq; | |
2061 | } | |
2062 | } | |
2063 | ||
93f0822d DB |
2064 | static int intel_pstate_verify_policy(struct cpufreq_policy *policy) |
2065 | { | |
7d9a8a9f | 2066 | struct cpudata *cpu = all_cpu_data[policy->cpu]; |
7d9a8a9f SP |
2067 | |
2068 | update_turbo_state(); | |
80b120ca RW |
2069 | cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, |
2070 | intel_pstate_get_max_freq(cpu)); | |
93f0822d | 2071 | |
285cb990 | 2072 | if (policy->policy != CPUFREQ_POLICY_POWERSAVE && |
c410833a | 2073 | policy->policy != CPUFREQ_POLICY_PERFORMANCE) |
93f0822d DB |
2074 | return -EINVAL; |
2075 | ||
80b120ca RW |
2076 | intel_pstate_adjust_policy_max(policy, cpu); |
2077 | ||
93f0822d DB |
2078 | return 0; |
2079 | } | |
2080 | ||
001c76f0 RW |
2081 | static void intel_cpufreq_stop_cpu(struct cpufreq_policy *policy) |
2082 | { | |
2083 | intel_pstate_set_min_pstate(all_cpu_data[policy->cpu]); | |
2084 | } | |
2085 | ||
bb18008f | 2086 | static void intel_pstate_stop_cpu(struct cpufreq_policy *policy) |
93f0822d | 2087 | { |
001c76f0 | 2088 | pr_debug("CPU %d exiting\n", policy->cpu); |
93f0822d | 2089 | |
001c76f0 | 2090 | intel_pstate_clear_update_util_hook(policy->cpu); |
984edbdc SP |
2091 | if (hwp_active) |
2092 | intel_pstate_hwp_save_state(policy); | |
2093 | else | |
001c76f0 RW |
2094 | intel_cpufreq_stop_cpu(policy); |
2095 | } | |
bb18008f | 2096 | |
001c76f0 RW |
2097 | static int intel_pstate_cpu_exit(struct cpufreq_policy *policy) |
2098 | { | |
2099 | intel_pstate_exit_perf_limits(policy); | |
a4675fbc | 2100 | |
001c76f0 | 2101 | policy->fast_switch_possible = false; |
2f86dc4c | 2102 | |
001c76f0 | 2103 | return 0; |
93f0822d DB |
2104 | } |
2105 | ||
001c76f0 | 2106 | static int __intel_pstate_cpu_init(struct cpufreq_policy *policy) |
93f0822d | 2107 | { |
93f0822d | 2108 | struct cpudata *cpu; |
52e0a509 | 2109 | int rc; |
93f0822d DB |
2110 | |
2111 | rc = intel_pstate_init_cpu(policy->cpu); | |
2112 | if (rc) | |
2113 | return rc; | |
2114 | ||
2115 | cpu = all_cpu_data[policy->cpu]; | |
2116 | ||
1a4fe38a SP |
2117 | cpu->max_perf_ratio = 0xFF; |
2118 | cpu->min_perf_ratio = 0; | |
93f0822d | 2119 | |
b27580b0 DB |
2120 | policy->min = cpu->pstate.min_pstate * cpu->pstate.scaling; |
2121 | policy->max = cpu->pstate.turbo_pstate * cpu->pstate.scaling; | |
93f0822d DB |
2122 | |
2123 | /* cpuinfo and default policy values */ | |
b27580b0 | 2124 | policy->cpuinfo.min_freq = cpu->pstate.min_pstate * cpu->pstate.scaling; |
983e600e | 2125 | update_turbo_state(); |
7de32556 | 2126 | policy->cpuinfo.max_freq = global.turbo_disabled ? |
983e600e SP |
2127 | cpu->pstate.max_pstate : cpu->pstate.turbo_pstate; |
2128 | policy->cpuinfo.max_freq *= cpu->pstate.scaling; | |
2129 | ||
9522a2ff | 2130 | intel_pstate_init_acpi_perf_limits(policy); |
93f0822d DB |
2131 | cpumask_set_cpu(policy->cpu, policy->cpus); |
2132 | ||
001c76f0 RW |
2133 | policy->fast_switch_possible = true; |
2134 | ||
93f0822d DB |
2135 | return 0; |
2136 | } | |
2137 | ||
001c76f0 | 2138 | static int intel_pstate_cpu_init(struct cpufreq_policy *policy) |
9522a2ff | 2139 | { |
001c76f0 RW |
2140 | int ret = __intel_pstate_cpu_init(policy); |
2141 | ||
2142 | if (ret) | |
2143 | return ret; | |
2144 | ||
2145 | policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL; | |
7de32556 | 2146 | if (IS_ENABLED(CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE)) |
001c76f0 RW |
2147 | policy->policy = CPUFREQ_POLICY_PERFORMANCE; |
2148 | else | |
2149 | policy->policy = CPUFREQ_POLICY_POWERSAVE; | |
9522a2ff SP |
2150 | |
2151 | return 0; | |
2152 | } | |
2153 | ||
001c76f0 | 2154 | static struct cpufreq_driver intel_pstate = { |
93f0822d DB |
2155 | .flags = CPUFREQ_CONST_LOOPS, |
2156 | .verify = intel_pstate_verify_policy, | |
2157 | .setpolicy = intel_pstate_set_policy, | |
984edbdc | 2158 | .suspend = intel_pstate_hwp_save_state, |
8442885f | 2159 | .resume = intel_pstate_resume, |
93f0822d DB |
2160 | .get = intel_pstate_get, |
2161 | .init = intel_pstate_cpu_init, | |
9522a2ff | 2162 | .exit = intel_pstate_cpu_exit, |
bb18008f | 2163 | .stop_cpu = intel_pstate_stop_cpu, |
93f0822d | 2164 | .name = "intel_pstate", |
93f0822d DB |
2165 | }; |
2166 | ||
001c76f0 RW |
2167 | static int intel_cpufreq_verify_policy(struct cpufreq_policy *policy) |
2168 | { | |
2169 | struct cpudata *cpu = all_cpu_data[policy->cpu]; | |
001c76f0 RW |
2170 | |
2171 | update_turbo_state(); | |
80b120ca RW |
2172 | cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, |
2173 | intel_pstate_get_max_freq(cpu)); | |
001c76f0 | 2174 | |
80b120ca | 2175 | intel_pstate_adjust_policy_max(policy, cpu); |
001c76f0 | 2176 | |
c5a2ee7d RW |
2177 | intel_pstate_update_perf_limits(policy, cpu); |
2178 | ||
001c76f0 RW |
2179 | return 0; |
2180 | } | |
2181 | ||
001c76f0 RW |
2182 | static int intel_cpufreq_target(struct cpufreq_policy *policy, |
2183 | unsigned int target_freq, | |
2184 | unsigned int relation) | |
2185 | { | |
2186 | struct cpudata *cpu = all_cpu_data[policy->cpu]; | |
2187 | struct cpufreq_freqs freqs; | |
2188 | int target_pstate; | |
2189 | ||
64897b20 RW |
2190 | update_turbo_state(); |
2191 | ||
001c76f0 | 2192 | freqs.old = policy->cur; |
64897b20 | 2193 | freqs.new = target_freq; |
001c76f0 RW |
2194 | |
2195 | cpufreq_freq_transition_begin(policy, &freqs); | |
2196 | switch (relation) { | |
2197 | case CPUFREQ_RELATION_L: | |
2198 | target_pstate = DIV_ROUND_UP(freqs.new, cpu->pstate.scaling); | |
2199 | break; | |
2200 | case CPUFREQ_RELATION_H: | |
2201 | target_pstate = freqs.new / cpu->pstate.scaling; | |
2202 | break; | |
2203 | default: | |
2204 | target_pstate = DIV_ROUND_CLOSEST(freqs.new, cpu->pstate.scaling); | |
2205 | break; | |
2206 | } | |
2207 | target_pstate = intel_pstate_prepare_request(cpu, target_pstate); | |
2208 | if (target_pstate != cpu->pstate.current_pstate) { | |
2209 | cpu->pstate.current_pstate = target_pstate; | |
2210 | wrmsrl_on_cpu(policy->cpu, MSR_IA32_PERF_CTL, | |
2211 | pstate_funcs.get_val(cpu, target_pstate)); | |
2212 | } | |
64078299 | 2213 | freqs.new = target_pstate * cpu->pstate.scaling; |
001c76f0 RW |
2214 | cpufreq_freq_transition_end(policy, &freqs, false); |
2215 | ||
2216 | return 0; | |
2217 | } | |
2218 | ||
2219 | static unsigned int intel_cpufreq_fast_switch(struct cpufreq_policy *policy, | |
2220 | unsigned int target_freq) | |
2221 | { | |
2222 | struct cpudata *cpu = all_cpu_data[policy->cpu]; | |
2223 | int target_pstate; | |
2224 | ||
64897b20 RW |
2225 | update_turbo_state(); |
2226 | ||
001c76f0 | 2227 | target_pstate = DIV_ROUND_UP(target_freq, cpu->pstate.scaling); |
64078299 | 2228 | target_pstate = intel_pstate_prepare_request(cpu, target_pstate); |
001c76f0 | 2229 | intel_pstate_update_pstate(cpu, target_pstate); |
64078299 | 2230 | return target_pstate * cpu->pstate.scaling; |
001c76f0 RW |
2231 | } |
2232 | ||
2233 | static int intel_cpufreq_cpu_init(struct cpufreq_policy *policy) | |
2234 | { | |
2235 | int ret = __intel_pstate_cpu_init(policy); | |
2236 | ||
2237 | if (ret) | |
2238 | return ret; | |
2239 | ||
2240 | policy->cpuinfo.transition_latency = INTEL_CPUFREQ_TRANSITION_LATENCY; | |
1b72e7fd | 2241 | policy->transition_delay_us = INTEL_CPUFREQ_TRANSITION_DELAY; |
001c76f0 RW |
2242 | /* This reflects the intel_pstate_get_cpu_pstates() setting. */ |
2243 | policy->cur = policy->cpuinfo.min_freq; | |
2244 | ||
2245 | return 0; | |
2246 | } | |
2247 | ||
2248 | static struct cpufreq_driver intel_cpufreq = { | |
2249 | .flags = CPUFREQ_CONST_LOOPS, | |
2250 | .verify = intel_cpufreq_verify_policy, | |
2251 | .target = intel_cpufreq_target, | |
2252 | .fast_switch = intel_cpufreq_fast_switch, | |
2253 | .init = intel_cpufreq_cpu_init, | |
2254 | .exit = intel_pstate_cpu_exit, | |
2255 | .stop_cpu = intel_cpufreq_stop_cpu, | |
2256 | .name = "intel_cpufreq", | |
2257 | }; | |
2258 | ||
ee8df89a | 2259 | static struct cpufreq_driver *default_driver = &intel_pstate; |
001c76f0 | 2260 | |
8ca6ce37 RW |
2261 | static bool pid_in_use(void) |
2262 | { | |
2263 | return intel_pstate_driver == &intel_pstate && | |
2264 | pstate_funcs.update_util == intel_pstate_update_util_pid; | |
2265 | } | |
2266 | ||
fb1fe104 RW |
2267 | static void intel_pstate_driver_cleanup(void) |
2268 | { | |
2269 | unsigned int cpu; | |
2270 | ||
2271 | get_online_cpus(); | |
2272 | for_each_online_cpu(cpu) { | |
2273 | if (all_cpu_data[cpu]) { | |
2274 | if (intel_pstate_driver == &intel_pstate) | |
2275 | intel_pstate_clear_update_util_hook(cpu); | |
2276 | ||
2277 | kfree(all_cpu_data[cpu]); | |
2278 | all_cpu_data[cpu] = NULL; | |
2279 | } | |
2280 | } | |
2281 | put_online_cpus(); | |
ee8df89a | 2282 | intel_pstate_driver = NULL; |
fb1fe104 RW |
2283 | } |
2284 | ||
ee8df89a | 2285 | static int intel_pstate_register_driver(struct cpufreq_driver *driver) |
fb1fe104 RW |
2286 | { |
2287 | int ret; | |
2288 | ||
c5a2ee7d RW |
2289 | memset(&global, 0, sizeof(global)); |
2290 | global.max_perf_pct = 100; | |
c3a49c89 | 2291 | |
ee8df89a | 2292 | intel_pstate_driver = driver; |
fb1fe104 RW |
2293 | ret = cpufreq_register_driver(intel_pstate_driver); |
2294 | if (ret) { | |
2295 | intel_pstate_driver_cleanup(); | |
2296 | return ret; | |
2297 | } | |
2298 | ||
c5a2ee7d RW |
2299 | global.min_perf_pct = min_perf_pct_min(); |
2300 | ||
8ca6ce37 | 2301 | if (pid_in_use()) |
fb1fe104 RW |
2302 | intel_pstate_debug_expose_params(); |
2303 | ||
2304 | return 0; | |
2305 | } | |
2306 | ||
2307 | static int intel_pstate_unregister_driver(void) | |
2308 | { | |
2309 | if (hwp_active) | |
2310 | return -EBUSY; | |
2311 | ||
8ca6ce37 | 2312 | if (pid_in_use()) |
fb1fe104 RW |
2313 | intel_pstate_debug_hide_params(); |
2314 | ||
fb1fe104 RW |
2315 | cpufreq_unregister_driver(intel_pstate_driver); |
2316 | intel_pstate_driver_cleanup(); | |
2317 | ||
2318 | return 0; | |
2319 | } | |
2320 | ||
2321 | static ssize_t intel_pstate_show_status(char *buf) | |
2322 | { | |
ee8df89a | 2323 | if (!intel_pstate_driver) |
fb1fe104 RW |
2324 | return sprintf(buf, "off\n"); |
2325 | ||
2326 | return sprintf(buf, "%s\n", intel_pstate_driver == &intel_pstate ? | |
2327 | "active" : "passive"); | |
2328 | } | |
2329 | ||
2330 | static int intel_pstate_update_status(const char *buf, size_t size) | |
2331 | { | |
2332 | int ret; | |
2333 | ||
2334 | if (size == 3 && !strncmp(buf, "off", size)) | |
ee8df89a | 2335 | return intel_pstate_driver ? |
fb1fe104 RW |
2336 | intel_pstate_unregister_driver() : -EINVAL; |
2337 | ||
2338 | if (size == 6 && !strncmp(buf, "active", size)) { | |
ee8df89a | 2339 | if (intel_pstate_driver) { |
fb1fe104 RW |
2340 | if (intel_pstate_driver == &intel_pstate) |
2341 | return 0; | |
2342 | ||
2343 | ret = intel_pstate_unregister_driver(); | |
2344 | if (ret) | |
2345 | return ret; | |
2346 | } | |
2347 | ||
ee8df89a | 2348 | return intel_pstate_register_driver(&intel_pstate); |
fb1fe104 RW |
2349 | } |
2350 | ||
2351 | if (size == 7 && !strncmp(buf, "passive", size)) { | |
ee8df89a | 2352 | if (intel_pstate_driver) { |
0042b2c0 | 2353 | if (intel_pstate_driver == &intel_cpufreq) |
fb1fe104 RW |
2354 | return 0; |
2355 | ||
2356 | ret = intel_pstate_unregister_driver(); | |
2357 | if (ret) | |
2358 | return ret; | |
2359 | } | |
2360 | ||
ee8df89a | 2361 | return intel_pstate_register_driver(&intel_cpufreq); |
fb1fe104 RW |
2362 | } |
2363 | ||
2364 | return -EINVAL; | |
2365 | } | |
2366 | ||
eed43609 JZ |
2367 | static int no_load __initdata; |
2368 | static int no_hwp __initdata; | |
2369 | static int hwp_only __initdata; | |
29327c84 | 2370 | static unsigned int force_load __initdata; |
6be26498 | 2371 | |
29327c84 | 2372 | static int __init intel_pstate_msrs_not_valid(void) |
b563b4e3 | 2373 | { |
016c8150 | 2374 | if (!pstate_funcs.get_max() || |
c410833a SK |
2375 | !pstate_funcs.get_min() || |
2376 | !pstate_funcs.get_turbo()) | |
b563b4e3 DB |
2377 | return -ENODEV; |
2378 | ||
b563b4e3 DB |
2379 | return 0; |
2380 | } | |
016c8150 | 2381 | |
7f7a516e SP |
2382 | #ifdef CONFIG_ACPI |
2383 | static void intel_pstate_use_acpi_profile(void) | |
2384 | { | |
55395345 RW |
2385 | switch (acpi_gbl_FADT.preferred_profile) { |
2386 | case PM_MOBILE: | |
2387 | case PM_TABLET: | |
2388 | case PM_APPLIANCE_PC: | |
2389 | case PM_DESKTOP: | |
2390 | case PM_WORKSTATION: | |
67dd9bf4 | 2391 | pstate_funcs.update_util = intel_pstate_update_util; |
55395345 | 2392 | } |
7f7a516e SP |
2393 | } |
2394 | #else | |
2395 | static void intel_pstate_use_acpi_profile(void) | |
2396 | { | |
2397 | } | |
2398 | #endif | |
2399 | ||
29327c84 | 2400 | static void __init copy_cpu_funcs(struct pstate_funcs *funcs) |
016c8150 DB |
2401 | { |
2402 | pstate_funcs.get_max = funcs->get_max; | |
3bcc6fa9 | 2403 | pstate_funcs.get_max_physical = funcs->get_max_physical; |
016c8150 DB |
2404 | pstate_funcs.get_min = funcs->get_min; |
2405 | pstate_funcs.get_turbo = funcs->get_turbo; | |
b27580b0 | 2406 | pstate_funcs.get_scaling = funcs->get_scaling; |
fdfdb2b1 | 2407 | pstate_funcs.get_val = funcs->get_val; |
007bea09 | 2408 | pstate_funcs.get_vid = funcs->get_vid; |
67dd9bf4 | 2409 | pstate_funcs.update_util = funcs->update_util; |
157386b6 | 2410 | |
7f7a516e | 2411 | intel_pstate_use_acpi_profile(); |
016c8150 DB |
2412 | } |
2413 | ||
9522a2ff | 2414 | #ifdef CONFIG_ACPI |
fbbcdc07 | 2415 | |
29327c84 | 2416 | static bool __init intel_pstate_no_acpi_pss(void) |
fbbcdc07 AH |
2417 | { |
2418 | int i; | |
2419 | ||
2420 | for_each_possible_cpu(i) { | |
2421 | acpi_status status; | |
2422 | union acpi_object *pss; | |
2423 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
2424 | struct acpi_processor *pr = per_cpu(processors, i); | |
2425 | ||
2426 | if (!pr) | |
2427 | continue; | |
2428 | ||
2429 | status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); | |
2430 | if (ACPI_FAILURE(status)) | |
2431 | continue; | |
2432 | ||
2433 | pss = buffer.pointer; | |
2434 | if (pss && pss->type == ACPI_TYPE_PACKAGE) { | |
2435 | kfree(pss); | |
2436 | return false; | |
2437 | } | |
2438 | ||
2439 | kfree(pss); | |
2440 | } | |
2441 | ||
2442 | return true; | |
2443 | } | |
2444 | ||
29327c84 | 2445 | static bool __init intel_pstate_has_acpi_ppc(void) |
966916ea | 2446 | { |
2447 | int i; | |
2448 | ||
2449 | for_each_possible_cpu(i) { | |
2450 | struct acpi_processor *pr = per_cpu(processors, i); | |
2451 | ||
2452 | if (!pr) | |
2453 | continue; | |
2454 | if (acpi_has_method(pr->handle, "_PPC")) | |
2455 | return true; | |
2456 | } | |
2457 | return false; | |
2458 | } | |
2459 | ||
2460 | enum { | |
2461 | PSS, | |
2462 | PPC, | |
2463 | }; | |
2464 | ||
fbbcdc07 AH |
2465 | struct hw_vendor_info { |
2466 | u16 valid; | |
2467 | char oem_id[ACPI_OEM_ID_SIZE]; | |
2468 | char oem_table_id[ACPI_OEM_TABLE_ID_SIZE]; | |
966916ea | 2469 | int oem_pwr_table; |
fbbcdc07 AH |
2470 | }; |
2471 | ||
2472 | /* Hardware vendor-specific info that has its own power management modes */ | |
29327c84 | 2473 | static struct hw_vendor_info vendor_info[] __initdata = { |
966916ea | 2474 | {1, "HP ", "ProLiant", PSS}, |
2475 | {1, "ORACLE", "X4-2 ", PPC}, | |
2476 | {1, "ORACLE", "X4-2L ", PPC}, | |
2477 | {1, "ORACLE", "X4-2B ", PPC}, | |
2478 | {1, "ORACLE", "X3-2 ", PPC}, | |
2479 | {1, "ORACLE", "X3-2L ", PPC}, | |
2480 | {1, "ORACLE", "X3-2B ", PPC}, | |
2481 | {1, "ORACLE", "X4470M2 ", PPC}, | |
2482 | {1, "ORACLE", "X4270M3 ", PPC}, | |
2483 | {1, "ORACLE", "X4270M2 ", PPC}, | |
2484 | {1, "ORACLE", "X4170M2 ", PPC}, | |
5aecc3c8 EZ |
2485 | {1, "ORACLE", "X4170 M3", PPC}, |
2486 | {1, "ORACLE", "X4275 M3", PPC}, | |
2487 | {1, "ORACLE", "X6-2 ", PPC}, | |
2488 | {1, "ORACLE", "Sudbury ", PPC}, | |
fbbcdc07 AH |
2489 | {0, "", ""}, |
2490 | }; | |
2491 | ||
29327c84 | 2492 | static bool __init intel_pstate_platform_pwr_mgmt_exists(void) |
fbbcdc07 AH |
2493 | { |
2494 | struct acpi_table_header hdr; | |
2495 | struct hw_vendor_info *v_info; | |
2f86dc4c DB |
2496 | const struct x86_cpu_id *id; |
2497 | u64 misc_pwr; | |
2498 | ||
2499 | id = x86_match_cpu(intel_pstate_cpu_oob_ids); | |
2500 | if (id) { | |
2501 | rdmsrl(MSR_MISC_PWR_MGMT, misc_pwr); | |
2502 | if ( misc_pwr & (1 << 8)) | |
2503 | return true; | |
2504 | } | |
fbbcdc07 | 2505 | |
c410833a SK |
2506 | if (acpi_disabled || |
2507 | ACPI_FAILURE(acpi_get_table_header(ACPI_SIG_FADT, 0, &hdr))) | |
fbbcdc07 AH |
2508 | return false; |
2509 | ||
2510 | for (v_info = vendor_info; v_info->valid; v_info++) { | |
c410833a | 2511 | if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE) && |
966916ea | 2512 | !strncmp(hdr.oem_table_id, v_info->oem_table_id, |
2513 | ACPI_OEM_TABLE_ID_SIZE)) | |
2514 | switch (v_info->oem_pwr_table) { | |
2515 | case PSS: | |
2516 | return intel_pstate_no_acpi_pss(); | |
2517 | case PPC: | |
aa4ea34d EZ |
2518 | return intel_pstate_has_acpi_ppc() && |
2519 | (!force_load); | |
966916ea | 2520 | } |
fbbcdc07 AH |
2521 | } |
2522 | ||
2523 | return false; | |
2524 | } | |
d0ea59e1 RW |
2525 | |
2526 | static void intel_pstate_request_control_from_smm(void) | |
2527 | { | |
2528 | /* | |
2529 | * It may be unsafe to request P-states control from SMM if _PPC support | |
2530 | * has not been enabled. | |
2531 | */ | |
2532 | if (acpi_ppc) | |
2533 | acpi_processor_pstate_control(); | |
2534 | } | |
fbbcdc07 AH |
2535 | #else /* CONFIG_ACPI not enabled */ |
2536 | static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; } | |
966916ea | 2537 | static inline bool intel_pstate_has_acpi_ppc(void) { return false; } |
d0ea59e1 | 2538 | static inline void intel_pstate_request_control_from_smm(void) {} |
fbbcdc07 AH |
2539 | #endif /* CONFIG_ACPI */ |
2540 | ||
7791e4aa SP |
2541 | static const struct x86_cpu_id hwp_support_ids[] __initconst = { |
2542 | { X86_VENDOR_INTEL, 6, X86_MODEL_ANY, X86_FEATURE_HWP }, | |
2543 | {} | |
2544 | }; | |
2545 | ||
93f0822d DB |
2546 | static int __init intel_pstate_init(void) |
2547 | { | |
eb5139d1 | 2548 | int rc; |
93f0822d | 2549 | |
6be26498 DB |
2550 | if (no_load) |
2551 | return -ENODEV; | |
2552 | ||
eb5139d1 | 2553 | if (x86_match_cpu(hwp_support_ids)) { |
2f49afc2 | 2554 | copy_cpu_funcs(&core_funcs); |
eb5139d1 | 2555 | if (no_hwp) { |
67dd9bf4 | 2556 | pstate_funcs.update_util = intel_pstate_update_util; |
eb5139d1 RW |
2557 | } else { |
2558 | hwp_active++; | |
2559 | intel_pstate.attr = hwp_cpufreq_attrs; | |
2560 | goto hwp_cpu_matched; | |
2561 | } | |
2562 | } else { | |
2563 | const struct x86_cpu_id *id; | |
7791e4aa | 2564 | |
eb5139d1 RW |
2565 | id = x86_match_cpu(intel_pstate_cpu_ids); |
2566 | if (!id) | |
2567 | return -ENODEV; | |
93f0822d | 2568 | |
2f49afc2 | 2569 | copy_cpu_funcs((struct pstate_funcs *)id->driver_data); |
eb5139d1 | 2570 | } |
016c8150 | 2571 | |
b563b4e3 DB |
2572 | if (intel_pstate_msrs_not_valid()) |
2573 | return -ENODEV; | |
2574 | ||
7791e4aa SP |
2575 | hwp_cpu_matched: |
2576 | /* | |
2577 | * The Intel pstate driver will be ignored if the platform | |
2578 | * firmware has its own power management modes. | |
2579 | */ | |
2580 | if (intel_pstate_platform_pwr_mgmt_exists()) | |
2581 | return -ENODEV; | |
2582 | ||
fb1fe104 RW |
2583 | if (!hwp_active && hwp_only) |
2584 | return -ENOTSUPP; | |
2585 | ||
4836df17 | 2586 | pr_info("Intel P-state driver initializing\n"); |
93f0822d | 2587 | |
b57ffac5 | 2588 | all_cpu_data = vzalloc(sizeof(void *) * num_possible_cpus()); |
93f0822d DB |
2589 | if (!all_cpu_data) |
2590 | return -ENOMEM; | |
93f0822d | 2591 | |
d0ea59e1 RW |
2592 | intel_pstate_request_control_from_smm(); |
2593 | ||
93f0822d | 2594 | intel_pstate_sysfs_expose_params(); |
b69880f9 | 2595 | |
0c30b65b | 2596 | mutex_lock(&intel_pstate_driver_lock); |
ee8df89a | 2597 | rc = intel_pstate_register_driver(default_driver); |
0c30b65b | 2598 | mutex_unlock(&intel_pstate_driver_lock); |
fb1fe104 RW |
2599 | if (rc) |
2600 | return rc; | |
366430b5 | 2601 | |
7791e4aa | 2602 | if (hwp_active) |
4836df17 | 2603 | pr_info("HWP enabled\n"); |
7791e4aa | 2604 | |
fb1fe104 | 2605 | return 0; |
93f0822d DB |
2606 | } |
2607 | device_initcall(intel_pstate_init); | |
2608 | ||
6be26498 DB |
2609 | static int __init intel_pstate_setup(char *str) |
2610 | { | |
2611 | if (!str) | |
2612 | return -EINVAL; | |
2613 | ||
001c76f0 | 2614 | if (!strcmp(str, "disable")) { |
6be26498 | 2615 | no_load = 1; |
001c76f0 RW |
2616 | } else if (!strcmp(str, "passive")) { |
2617 | pr_info("Passive mode enabled\n"); | |
ee8df89a | 2618 | default_driver = &intel_cpufreq; |
001c76f0 RW |
2619 | no_hwp = 1; |
2620 | } | |
539342f6 | 2621 | if (!strcmp(str, "no_hwp")) { |
4836df17 | 2622 | pr_info("HWP disabled\n"); |
2f86dc4c | 2623 | no_hwp = 1; |
539342f6 | 2624 | } |
aa4ea34d EZ |
2625 | if (!strcmp(str, "force")) |
2626 | force_load = 1; | |
d64c3b0b KCA |
2627 | if (!strcmp(str, "hwp_only")) |
2628 | hwp_only = 1; | |
eae48f04 SP |
2629 | if (!strcmp(str, "per_cpu_perf_limits")) |
2630 | per_cpu_limits = true; | |
9522a2ff SP |
2631 | |
2632 | #ifdef CONFIG_ACPI | |
2633 | if (!strcmp(str, "support_acpi_ppc")) | |
2634 | acpi_ppc = true; | |
2635 | #endif | |
2636 | ||
6be26498 DB |
2637 | return 0; |
2638 | } | |
2639 | early_param("intel_pstate", intel_pstate_setup); | |
2640 | ||
93f0822d DB |
2641 | MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@intel.com>"); |
2642 | MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors"); | |
2643 | MODULE_LICENSE("GPL"); |