Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1 | /* |
Srinivas Pandruvada | d1b6848 | 2013-04-09 22:38:18 +0000 | [diff] [blame] | 2 | * intel_pstate.c: Native P state management for Intel processors |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 3 | * |
| 4 | * (C) Copyright 2012 Intel Corporation |
| 5 | * Author: Dirk Brandewie <dirk.j.brandewie@intel.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; version 2 |
| 10 | * of the License. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/kernel_stat.h> |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/ktime.h> |
| 17 | #include <linux/hrtimer.h> |
| 18 | #include <linux/tick.h> |
| 19 | #include <linux/slab.h> |
| 20 | #include <linux/sched.h> |
| 21 | #include <linux/list.h> |
| 22 | #include <linux/cpu.h> |
| 23 | #include <linux/cpufreq.h> |
| 24 | #include <linux/sysfs.h> |
| 25 | #include <linux/types.h> |
| 26 | #include <linux/fs.h> |
| 27 | #include <linux/debugfs.h> |
Adrian Huang | fbbcdc0 | 2013-10-31 23:24:05 +0800 | [diff] [blame] | 28 | #include <linux/acpi.h> |
Stephen Rothwell | d647230 | 2015-06-02 19:01:38 +1000 | [diff] [blame] | 29 | #include <linux/vmalloc.h> |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 30 | #include <trace/events/power.h> |
| 31 | |
| 32 | #include <asm/div64.h> |
| 33 | #include <asm/msr.h> |
| 34 | #include <asm/cpu_device_id.h> |
Borislav Petkov | 64df1fd | 2015-04-03 15:19:53 +0200 | [diff] [blame] | 35 | #include <asm/cpufeature.h> |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 36 | |
Srinivas Pandruvada | 37afb00 | 2015-10-14 16:12:01 -0700 | [diff] [blame] | 37 | #if IS_ENABLED(CONFIG_ACPI) |
| 38 | #include <acpi/processor.h> |
| 39 | #endif |
| 40 | |
Dirk Brandewie | 61d8d2a | 2014-02-12 10:01:07 -0800 | [diff] [blame] | 41 | #define BYT_RATIOS 0x66a |
| 42 | #define BYT_VIDS 0x66b |
| 43 | #define BYT_TURBO_RATIOS 0x66c |
Dirk Brandewie | 21855ff | 2014-05-08 12:57:23 -0700 | [diff] [blame] | 44 | #define BYT_TURBO_VIDS 0x66d |
Dirk Brandewie | 61d8d2a | 2014-02-12 10:01:07 -0800 | [diff] [blame] | 45 | |
Dirk Brandewie | f0fe3cd | 2014-05-29 09:32:23 -0700 | [diff] [blame] | 46 | #define FRAC_BITS 8 |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 47 | #define int_tofp(X) ((int64_t)(X) << FRAC_BITS) |
| 48 | #define fp_toint(X) ((X) >> FRAC_BITS) |
Dirk Brandewie | f0fe3cd | 2014-05-29 09:32:23 -0700 | [diff] [blame] | 49 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 50 | static inline int32_t mul_fp(int32_t x, int32_t y) |
| 51 | { |
| 52 | return ((int64_t)x * (int64_t)y) >> FRAC_BITS; |
| 53 | } |
| 54 | |
Prarit Bhargava | 7180ddd | 2015-06-15 13:43:29 -0400 | [diff] [blame] | 55 | static inline int32_t div_fp(s64 x, s64 y) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 56 | { |
Prarit Bhargava | 7180ddd | 2015-06-15 13:43:29 -0400 | [diff] [blame] | 57 | return div64_s64((int64_t)x << FRAC_BITS, y); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 58 | } |
| 59 | |
Dirk Brandewie | d022a65 | 2014-10-13 08:37:44 -0700 | [diff] [blame] | 60 | static inline int ceiling_fp(int32_t x) |
| 61 | { |
| 62 | int mask, ret; |
| 63 | |
| 64 | ret = fp_toint(x); |
| 65 | mask = (1 << FRAC_BITS) - 1; |
| 66 | if (x & mask) |
| 67 | ret += 1; |
| 68 | return ret; |
| 69 | } |
| 70 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 71 | struct sample { |
Brennan Shacklett | d253d2a | 2013-10-21 09:20:32 -0700 | [diff] [blame] | 72 | int32_t core_pct_busy; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 73 | u64 aperf; |
| 74 | u64 mperf; |
Doug Smythies | 4055fad | 2015-04-11 21:10:26 -0700 | [diff] [blame] | 75 | u64 tsc; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 76 | int freq; |
Dirk Brandewie | c4ee841 | 2014-05-29 09:32:24 -0700 | [diff] [blame] | 77 | ktime_t time; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 78 | }; |
| 79 | |
| 80 | struct pstate_data { |
| 81 | int current_pstate; |
| 82 | int min_pstate; |
| 83 | int max_pstate; |
Srinivas Pandruvada | 3bcc6fa | 2015-10-14 16:12:00 -0700 | [diff] [blame] | 84 | int max_pstate_physical; |
Dirk Brandewie | b27580b | 2014-10-13 08:37:43 -0700 | [diff] [blame] | 85 | int scaling; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 86 | int turbo_pstate; |
| 87 | }; |
| 88 | |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 89 | struct vid_data { |
Dirk Brandewie | 21855ff | 2014-05-08 12:57:23 -0700 | [diff] [blame] | 90 | int min; |
| 91 | int max; |
| 92 | int turbo; |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 93 | int32_t ratio; |
| 94 | }; |
| 95 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 96 | struct _pid { |
| 97 | int setpoint; |
| 98 | int32_t integral; |
| 99 | int32_t p_gain; |
| 100 | int32_t i_gain; |
| 101 | int32_t d_gain; |
| 102 | int deadband; |
Brennan Shacklett | d253d2a | 2013-10-21 09:20:32 -0700 | [diff] [blame] | 103 | int32_t last_err; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 104 | }; |
| 105 | |
| 106 | struct cpudata { |
| 107 | int cpu; |
| 108 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 109 | struct timer_list timer; |
| 110 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 111 | struct pstate_data pstate; |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 112 | struct vid_data vid; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 113 | struct _pid pid; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 114 | |
Dirk Brandewie | c4ee841 | 2014-05-29 09:32:24 -0700 | [diff] [blame] | 115 | ktime_t last_sample_time; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 116 | u64 prev_aperf; |
| 117 | u64 prev_mperf; |
Doug Smythies | 4055fad | 2015-04-11 21:10:26 -0700 | [diff] [blame] | 118 | u64 prev_tsc; |
Dirk Brandewie | d37e2b7 | 2014-02-12 10:01:04 -0800 | [diff] [blame] | 119 | struct sample sample; |
Srinivas Pandruvada | 37afb00 | 2015-10-14 16:12:01 -0700 | [diff] [blame] | 120 | #if IS_ENABLED(CONFIG_ACPI) |
| 121 | struct acpi_processor_performance acpi_perf_data; |
| 122 | #endif |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 123 | }; |
| 124 | |
| 125 | static struct cpudata **all_cpu_data; |
| 126 | struct pstate_adjust_policy { |
| 127 | int sample_rate_ms; |
| 128 | int deadband; |
| 129 | int setpoint; |
| 130 | int p_gain_pct; |
| 131 | int d_gain_pct; |
| 132 | int i_gain_pct; |
| 133 | }; |
| 134 | |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 135 | struct pstate_funcs { |
| 136 | int (*get_max)(void); |
Srinivas Pandruvada | 3bcc6fa | 2015-10-14 16:12:00 -0700 | [diff] [blame] | 137 | int (*get_max_physical)(void); |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 138 | int (*get_min)(void); |
| 139 | int (*get_turbo)(void); |
Dirk Brandewie | b27580b | 2014-10-13 08:37:43 -0700 | [diff] [blame] | 140 | int (*get_scaling)(void); |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 141 | void (*set)(struct cpudata*, int pstate); |
| 142 | void (*get_vid)(struct cpudata *); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 143 | }; |
| 144 | |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 145 | struct cpu_defaults { |
| 146 | struct pstate_adjust_policy pid_policy; |
| 147 | struct pstate_funcs funcs; |
| 148 | }; |
| 149 | |
| 150 | static struct pstate_adjust_policy pid_params; |
| 151 | static struct pstate_funcs pstate_funcs; |
Dirk Brandewie | 2f86dc4 | 2014-11-06 09:40:47 -0800 | [diff] [blame] | 152 | static int hwp_active; |
Srinivas Pandruvada | 37afb00 | 2015-10-14 16:12:01 -0700 | [diff] [blame] | 153 | static int no_acpi_perf; |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 154 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 155 | struct perf_limits { |
| 156 | int no_turbo; |
Dirk Brandewie | dd5fbf7 | 2014-06-20 07:27:59 -0700 | [diff] [blame] | 157 | int turbo_disabled; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 158 | int max_perf_pct; |
| 159 | int min_perf_pct; |
| 160 | int32_t max_perf; |
| 161 | int32_t min_perf; |
Dirk Brandewie | d8f469e | 2013-05-07 08:20:26 -0700 | [diff] [blame] | 162 | int max_policy_pct; |
| 163 | int max_sysfs_pct; |
Kristen Carlson Accardi | a047599 | 2015-01-29 13:03:52 -0800 | [diff] [blame] | 164 | int min_policy_pct; |
| 165 | int min_sysfs_pct; |
Srinivas Pandruvada | 4ef4514 | 2015-10-14 16:12:03 -0700 | [diff] [blame^] | 166 | int max_perf_ctl; |
| 167 | int min_perf_ctl; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 168 | }; |
| 169 | |
| 170 | static struct perf_limits limits = { |
| 171 | .no_turbo = 0, |
Gabriele Mazzotta | 4521e1a0 | 2014-10-13 08:37:41 -0700 | [diff] [blame] | 172 | .turbo_disabled = 0, |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 173 | .max_perf_pct = 100, |
| 174 | .max_perf = int_tofp(1), |
| 175 | .min_perf_pct = 0, |
| 176 | .min_perf = 0, |
Dirk Brandewie | d8f469e | 2013-05-07 08:20:26 -0700 | [diff] [blame] | 177 | .max_policy_pct = 100, |
| 178 | .max_sysfs_pct = 100, |
Kristen Carlson Accardi | a047599 | 2015-01-29 13:03:52 -0800 | [diff] [blame] | 179 | .min_policy_pct = 0, |
| 180 | .min_sysfs_pct = 0, |
Srinivas Pandruvada | 4ef4514 | 2015-10-14 16:12:03 -0700 | [diff] [blame^] | 181 | .max_perf_ctl = 0, |
| 182 | .min_perf_ctl = 0, |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 183 | }; |
| 184 | |
Srinivas Pandruvada | 37afb00 | 2015-10-14 16:12:01 -0700 | [diff] [blame] | 185 | #if IS_ENABLED(CONFIG_ACPI) |
| 186 | /* |
| 187 | * The max target pstate ratio is a 8 bit value in both PLATFORM_INFO MSR and |
| 188 | * in TURBO_RATIO_LIMIT MSR, which pstate driver stores in max_pstate and |
| 189 | * max_turbo_pstate fields. The PERF_CTL MSR contains 16 bit value for P state |
| 190 | * ratio, out of it only high 8 bits are used. For example 0x1700 is setting |
| 191 | * target ratio 0x17. The _PSS control value stores in a format which can be |
| 192 | * directly written to PERF_CTL MSR. But in intel_pstate driver this shift |
| 193 | * occurs during write to PERF_CTL (E.g. for cores core_set_pstate()). |
| 194 | * This function converts the _PSS control value to intel pstate driver format |
| 195 | * for comparison and assignment. |
| 196 | */ |
| 197 | static int convert_to_native_pstate_format(struct cpudata *cpu, int index) |
| 198 | { |
| 199 | return cpu->acpi_perf_data.states[index].control >> 8; |
| 200 | } |
| 201 | |
| 202 | static int intel_pstate_init_perf_limits(struct cpufreq_policy *policy) |
| 203 | { |
| 204 | struct cpudata *cpu; |
| 205 | int ret; |
| 206 | bool turbo_absent = false; |
| 207 | int max_pstate_index; |
| 208 | int min_pss_ctl, max_pss_ctl, turbo_pss_ctl; |
| 209 | int i; |
| 210 | |
| 211 | cpu = all_cpu_data[policy->cpu]; |
| 212 | |
| 213 | pr_debug("intel_pstate: default limits 0x%x 0x%x 0x%x\n", |
| 214 | cpu->pstate.min_pstate, cpu->pstate.max_pstate, |
| 215 | cpu->pstate.turbo_pstate); |
| 216 | |
| 217 | if (!cpu->acpi_perf_data.shared_cpu_map && |
| 218 | zalloc_cpumask_var_node(&cpu->acpi_perf_data.shared_cpu_map, |
| 219 | GFP_KERNEL, cpu_to_node(policy->cpu))) { |
| 220 | return -ENOMEM; |
| 221 | } |
| 222 | |
| 223 | ret = acpi_processor_register_performance(&cpu->acpi_perf_data, |
| 224 | policy->cpu); |
| 225 | if (ret) |
| 226 | return ret; |
| 227 | |
| 228 | /* |
| 229 | * Check if the control value in _PSS is for PERF_CTL MSR, which should |
| 230 | * guarantee that the states returned by it map to the states in our |
| 231 | * list directly. |
| 232 | */ |
| 233 | if (cpu->acpi_perf_data.control_register.space_id != |
| 234 | ACPI_ADR_SPACE_FIXED_HARDWARE) |
| 235 | return -EIO; |
| 236 | |
| 237 | pr_debug("intel_pstate: CPU%u - ACPI _PSS perf data\n", policy->cpu); |
| 238 | for (i = 0; i < cpu->acpi_perf_data.state_count; i++) |
| 239 | pr_debug(" %cP%d: %u MHz, %u mW, 0x%x\n", |
| 240 | (i == cpu->acpi_perf_data.state ? '*' : ' '), i, |
| 241 | (u32) cpu->acpi_perf_data.states[i].core_frequency, |
| 242 | (u32) cpu->acpi_perf_data.states[i].power, |
| 243 | (u32) cpu->acpi_perf_data.states[i].control); |
| 244 | |
| 245 | /* |
| 246 | * If there is only one entry _PSS, simply ignore _PSS and continue as |
| 247 | * usual without taking _PSS into account |
| 248 | */ |
| 249 | if (cpu->acpi_perf_data.state_count < 2) |
| 250 | return 0; |
| 251 | |
| 252 | turbo_pss_ctl = convert_to_native_pstate_format(cpu, 0); |
| 253 | min_pss_ctl = convert_to_native_pstate_format(cpu, |
| 254 | cpu->acpi_perf_data.state_count - 1); |
| 255 | /* Check if there is a turbo freq in _PSS */ |
| 256 | if (turbo_pss_ctl <= cpu->pstate.max_pstate && |
| 257 | turbo_pss_ctl > cpu->pstate.min_pstate) { |
| 258 | pr_debug("intel_pstate: no turbo range exists in _PSS\n"); |
| 259 | limits.no_turbo = limits.turbo_disabled = 1; |
| 260 | cpu->pstate.turbo_pstate = cpu->pstate.max_pstate; |
| 261 | turbo_absent = true; |
| 262 | } |
| 263 | |
| 264 | /* Check if the max non turbo p state < Intel P state max */ |
| 265 | max_pstate_index = turbo_absent ? 0 : 1; |
| 266 | max_pss_ctl = convert_to_native_pstate_format(cpu, max_pstate_index); |
| 267 | if (max_pss_ctl < cpu->pstate.max_pstate && |
| 268 | max_pss_ctl > cpu->pstate.min_pstate) |
| 269 | cpu->pstate.max_pstate = max_pss_ctl; |
| 270 | |
| 271 | /* check If min perf > Intel P State min */ |
| 272 | if (min_pss_ctl > cpu->pstate.min_pstate && |
| 273 | min_pss_ctl < cpu->pstate.max_pstate) { |
| 274 | cpu->pstate.min_pstate = min_pss_ctl; |
| 275 | policy->cpuinfo.min_freq = min_pss_ctl * cpu->pstate.scaling; |
| 276 | } |
| 277 | |
| 278 | if (turbo_absent) |
| 279 | policy->cpuinfo.max_freq = cpu->pstate.max_pstate * |
| 280 | cpu->pstate.scaling; |
| 281 | else { |
| 282 | policy->cpuinfo.max_freq = cpu->pstate.turbo_pstate * |
| 283 | cpu->pstate.scaling; |
| 284 | /* |
| 285 | * The _PSS table doesn't contain whole turbo frequency range. |
| 286 | * This just contains +1 MHZ above the max non turbo frequency, |
| 287 | * with control value corresponding to max turbo ratio. But |
| 288 | * when cpufreq set policy is called, it will call with this |
| 289 | * max frequency, which will cause a reduced performance as |
| 290 | * this driver uses real max turbo frequency as the max |
| 291 | * frequeny. So correct this frequency in _PSS table to |
| 292 | * correct max turbo frequency based on the turbo ratio. |
| 293 | * Also need to convert to MHz as _PSS freq is in MHz. |
| 294 | */ |
| 295 | cpu->acpi_perf_data.states[0].core_frequency = |
| 296 | turbo_pss_ctl * 100; |
| 297 | } |
| 298 | |
| 299 | pr_debug("intel_pstate: Updated limits using _PSS 0x%x 0x%x 0x%x\n", |
| 300 | cpu->pstate.min_pstate, cpu->pstate.max_pstate, |
| 301 | cpu->pstate.turbo_pstate); |
| 302 | pr_debug("intel_pstate: policy max_freq=%d Khz min_freq = %d KHz\n", |
| 303 | policy->cpuinfo.max_freq, policy->cpuinfo.min_freq); |
| 304 | |
| 305 | return 0; |
| 306 | } |
| 307 | |
| 308 | static int intel_pstate_exit_perf_limits(struct cpufreq_policy *policy) |
| 309 | { |
| 310 | struct cpudata *cpu; |
| 311 | |
| 312 | if (!no_acpi_perf) |
| 313 | return 0; |
| 314 | |
| 315 | cpu = all_cpu_data[policy->cpu]; |
| 316 | acpi_processor_unregister_performance(policy->cpu); |
| 317 | return 0; |
| 318 | } |
| 319 | |
| 320 | #else |
| 321 | static int intel_pstate_init_perf_limits(struct cpufreq_policy *policy) |
| 322 | { |
| 323 | return 0; |
| 324 | } |
| 325 | |
| 326 | static int intel_pstate_exit_perf_limits(struct cpufreq_policy *policy) |
| 327 | { |
| 328 | return 0; |
| 329 | } |
| 330 | #endif |
| 331 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 332 | static inline void pid_reset(struct _pid *pid, int setpoint, int busy, |
Stratos Karafotis | c410833 | 2014-07-18 08:37:23 -0700 | [diff] [blame] | 333 | int deadband, int integral) { |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 334 | pid->setpoint = setpoint; |
| 335 | pid->deadband = deadband; |
| 336 | pid->integral = int_tofp(integral); |
Dirk Brandewie | d98d099 | 2014-02-12 10:01:05 -0800 | [diff] [blame] | 337 | pid->last_err = int_tofp(setpoint) - int_tofp(busy); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 338 | } |
| 339 | |
| 340 | static inline void pid_p_gain_set(struct _pid *pid, int percent) |
| 341 | { |
| 342 | pid->p_gain = div_fp(int_tofp(percent), int_tofp(100)); |
| 343 | } |
| 344 | |
| 345 | static inline void pid_i_gain_set(struct _pid *pid, int percent) |
| 346 | { |
| 347 | pid->i_gain = div_fp(int_tofp(percent), int_tofp(100)); |
| 348 | } |
| 349 | |
| 350 | static inline void pid_d_gain_set(struct _pid *pid, int percent) |
| 351 | { |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 352 | pid->d_gain = div_fp(int_tofp(percent), int_tofp(100)); |
| 353 | } |
| 354 | |
Brennan Shacklett | d253d2a | 2013-10-21 09:20:32 -0700 | [diff] [blame] | 355 | static signed int pid_calc(struct _pid *pid, int32_t busy) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 356 | { |
Brennan Shacklett | d253d2a | 2013-10-21 09:20:32 -0700 | [diff] [blame] | 357 | signed int result; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 358 | int32_t pterm, dterm, fp_error; |
| 359 | int32_t integral_limit; |
| 360 | |
Brennan Shacklett | d253d2a | 2013-10-21 09:20:32 -0700 | [diff] [blame] | 361 | fp_error = int_tofp(pid->setpoint) - busy; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 362 | |
Brennan Shacklett | d253d2a | 2013-10-21 09:20:32 -0700 | [diff] [blame] | 363 | if (abs(fp_error) <= int_tofp(pid->deadband)) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 364 | return 0; |
| 365 | |
| 366 | pterm = mul_fp(pid->p_gain, fp_error); |
| 367 | |
| 368 | pid->integral += fp_error; |
| 369 | |
Kristen Carlson Accardi | e0d4c8f | 2014-12-10 12:39:38 -0800 | [diff] [blame] | 370 | /* |
| 371 | * We limit the integral here so that it will never |
| 372 | * get higher than 30. This prevents it from becoming |
| 373 | * too large an input over long periods of time and allows |
| 374 | * it to get factored out sooner. |
| 375 | * |
| 376 | * The value of 30 was chosen through experimentation. |
| 377 | */ |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 378 | integral_limit = int_tofp(30); |
| 379 | if (pid->integral > integral_limit) |
| 380 | pid->integral = integral_limit; |
| 381 | if (pid->integral < -integral_limit) |
| 382 | pid->integral = -integral_limit; |
| 383 | |
Brennan Shacklett | d253d2a | 2013-10-21 09:20:32 -0700 | [diff] [blame] | 384 | dterm = mul_fp(pid->d_gain, fp_error - pid->last_err); |
| 385 | pid->last_err = fp_error; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 386 | |
| 387 | result = pterm + mul_fp(pid->integral, pid->i_gain) + dterm; |
Doug Smythies | 51d211e | 2014-06-17 13:36:10 -0700 | [diff] [blame] | 388 | result = result + (1 << (FRAC_BITS-1)); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 389 | return (signed int)fp_toint(result); |
| 390 | } |
| 391 | |
| 392 | static inline void intel_pstate_busy_pid_reset(struct cpudata *cpu) |
| 393 | { |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 394 | pid_p_gain_set(&cpu->pid, pid_params.p_gain_pct); |
| 395 | pid_d_gain_set(&cpu->pid, pid_params.d_gain_pct); |
| 396 | pid_i_gain_set(&cpu->pid, pid_params.i_gain_pct); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 397 | |
Stratos Karafotis | 2d8d1f1 | 2014-07-18 08:37:20 -0700 | [diff] [blame] | 398 | pid_reset(&cpu->pid, pid_params.setpoint, 100, pid_params.deadband, 0); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 399 | } |
| 400 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 401 | static inline void intel_pstate_reset_all_pid(void) |
| 402 | { |
| 403 | unsigned int cpu; |
Stratos Karafotis | 845c1cb | 2014-07-18 08:37:19 -0700 | [diff] [blame] | 404 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 405 | for_each_online_cpu(cpu) { |
| 406 | if (all_cpu_data[cpu]) |
| 407 | intel_pstate_busy_pid_reset(all_cpu_data[cpu]); |
| 408 | } |
| 409 | } |
| 410 | |
Gabriele Mazzotta | 4521e1a0 | 2014-10-13 08:37:41 -0700 | [diff] [blame] | 411 | static inline void update_turbo_state(void) |
| 412 | { |
| 413 | u64 misc_en; |
| 414 | struct cpudata *cpu; |
| 415 | |
| 416 | cpu = all_cpu_data[0]; |
| 417 | rdmsrl(MSR_IA32_MISC_ENABLE, misc_en); |
| 418 | limits.turbo_disabled = |
| 419 | (misc_en & MSR_IA32_MISC_ENABLE_TURBO_DISABLE || |
| 420 | cpu->pstate.max_pstate == cpu->pstate.turbo_pstate); |
| 421 | } |
| 422 | |
Dirk Brandewie | 2f86dc4 | 2014-11-06 09:40:47 -0800 | [diff] [blame] | 423 | static void intel_pstate_hwp_set(void) |
| 424 | { |
Kristen Carlson Accardi | 74da56c | 2015-09-09 11:41:22 -0700 | [diff] [blame] | 425 | int min, hw_min, max, hw_max, cpu, range, adj_range; |
| 426 | u64 value, cap; |
| 427 | |
| 428 | rdmsrl(MSR_HWP_CAPABILITIES, cap); |
| 429 | hw_min = HWP_LOWEST_PERF(cap); |
| 430 | hw_max = HWP_HIGHEST_PERF(cap); |
| 431 | range = hw_max - hw_min; |
Dirk Brandewie | 2f86dc4 | 2014-11-06 09:40:47 -0800 | [diff] [blame] | 432 | |
| 433 | get_online_cpus(); |
| 434 | |
| 435 | for_each_online_cpu(cpu) { |
| 436 | rdmsrl_on_cpu(cpu, MSR_HWP_REQUEST, &value); |
Kristen Carlson Accardi | 74da56c | 2015-09-09 11:41:22 -0700 | [diff] [blame] | 437 | adj_range = limits.min_perf_pct * range / 100; |
| 438 | min = hw_min + adj_range; |
Dirk Brandewie | 2f86dc4 | 2014-11-06 09:40:47 -0800 | [diff] [blame] | 439 | value &= ~HWP_MIN_PERF(~0L); |
| 440 | value |= HWP_MIN_PERF(min); |
| 441 | |
Kristen Carlson Accardi | 74da56c | 2015-09-09 11:41:22 -0700 | [diff] [blame] | 442 | adj_range = limits.max_perf_pct * range / 100; |
| 443 | max = hw_min + adj_range; |
Dirk Brandewie | 2f86dc4 | 2014-11-06 09:40:47 -0800 | [diff] [blame] | 444 | if (limits.no_turbo) { |
Kristen Carlson Accardi | 74da56c | 2015-09-09 11:41:22 -0700 | [diff] [blame] | 445 | hw_max = HWP_GUARANTEED_PERF(cap); |
| 446 | if (hw_max < max) |
| 447 | max = hw_max; |
Dirk Brandewie | 2f86dc4 | 2014-11-06 09:40:47 -0800 | [diff] [blame] | 448 | } |
| 449 | |
| 450 | value &= ~HWP_MAX_PERF(~0L); |
| 451 | value |= HWP_MAX_PERF(max); |
| 452 | wrmsrl_on_cpu(cpu, MSR_HWP_REQUEST, value); |
| 453 | } |
| 454 | |
| 455 | put_online_cpus(); |
| 456 | } |
| 457 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 458 | /************************** debugfs begin ************************/ |
| 459 | static int pid_param_set(void *data, u64 val) |
| 460 | { |
| 461 | *(u32 *)data = val; |
| 462 | intel_pstate_reset_all_pid(); |
| 463 | return 0; |
| 464 | } |
Stratos Karafotis | 845c1cb | 2014-07-18 08:37:19 -0700 | [diff] [blame] | 465 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 466 | static int pid_param_get(void *data, u64 *val) |
| 467 | { |
| 468 | *val = *(u32 *)data; |
| 469 | return 0; |
| 470 | } |
Stratos Karafotis | 2d8d1f1 | 2014-07-18 08:37:20 -0700 | [diff] [blame] | 471 | DEFINE_SIMPLE_ATTRIBUTE(fops_pid_param, pid_param_get, pid_param_set, "%llu\n"); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 472 | |
| 473 | struct pid_param { |
| 474 | char *name; |
| 475 | void *value; |
| 476 | }; |
| 477 | |
| 478 | static struct pid_param pid_files[] = { |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 479 | {"sample_rate_ms", &pid_params.sample_rate_ms}, |
| 480 | {"d_gain_pct", &pid_params.d_gain_pct}, |
| 481 | {"i_gain_pct", &pid_params.i_gain_pct}, |
| 482 | {"deadband", &pid_params.deadband}, |
| 483 | {"setpoint", &pid_params.setpoint}, |
| 484 | {"p_gain_pct", &pid_params.p_gain_pct}, |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 485 | {NULL, NULL} |
| 486 | }; |
| 487 | |
Stratos Karafotis | 317dd50 | 2014-07-18 08:37:17 -0700 | [diff] [blame] | 488 | static void __init intel_pstate_debug_expose_params(void) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 489 | { |
Stratos Karafotis | 317dd50 | 2014-07-18 08:37:17 -0700 | [diff] [blame] | 490 | struct dentry *debugfs_parent; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 491 | int i = 0; |
| 492 | |
Dirk Brandewie | 2f86dc4 | 2014-11-06 09:40:47 -0800 | [diff] [blame] | 493 | if (hwp_active) |
| 494 | return; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 495 | debugfs_parent = debugfs_create_dir("pstate_snb", NULL); |
| 496 | if (IS_ERR_OR_NULL(debugfs_parent)) |
| 497 | return; |
| 498 | while (pid_files[i].name) { |
| 499 | debugfs_create_file(pid_files[i].name, 0660, |
Stratos Karafotis | c410833 | 2014-07-18 08:37:23 -0700 | [diff] [blame] | 500 | debugfs_parent, pid_files[i].value, |
| 501 | &fops_pid_param); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 502 | i++; |
| 503 | } |
| 504 | } |
| 505 | |
| 506 | /************************** debugfs end ************************/ |
| 507 | |
| 508 | /************************** sysfs begin ************************/ |
| 509 | #define show_one(file_name, object) \ |
| 510 | static ssize_t show_##file_name \ |
| 511 | (struct kobject *kobj, struct attribute *attr, char *buf) \ |
| 512 | { \ |
| 513 | return sprintf(buf, "%u\n", limits.object); \ |
| 514 | } |
| 515 | |
Kristen Carlson Accardi | d01b1f4 | 2015-01-28 15:03:27 -0800 | [diff] [blame] | 516 | static ssize_t show_turbo_pct(struct kobject *kobj, |
| 517 | struct attribute *attr, char *buf) |
| 518 | { |
| 519 | struct cpudata *cpu; |
| 520 | int total, no_turbo, turbo_pct; |
| 521 | uint32_t turbo_fp; |
| 522 | |
| 523 | cpu = all_cpu_data[0]; |
| 524 | |
| 525 | total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1; |
| 526 | no_turbo = cpu->pstate.max_pstate - cpu->pstate.min_pstate + 1; |
| 527 | turbo_fp = div_fp(int_tofp(no_turbo), int_tofp(total)); |
| 528 | turbo_pct = 100 - fp_toint(mul_fp(turbo_fp, int_tofp(100))); |
| 529 | return sprintf(buf, "%u\n", turbo_pct); |
| 530 | } |
| 531 | |
Kristen Carlson Accardi | 0522424 | 2015-01-28 15:03:28 -0800 | [diff] [blame] | 532 | static ssize_t show_num_pstates(struct kobject *kobj, |
| 533 | struct attribute *attr, char *buf) |
| 534 | { |
| 535 | struct cpudata *cpu; |
| 536 | int total; |
| 537 | |
| 538 | cpu = all_cpu_data[0]; |
| 539 | total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1; |
| 540 | return sprintf(buf, "%u\n", total); |
| 541 | } |
| 542 | |
Gabriele Mazzotta | 4521e1a0 | 2014-10-13 08:37:41 -0700 | [diff] [blame] | 543 | static ssize_t show_no_turbo(struct kobject *kobj, |
| 544 | struct attribute *attr, char *buf) |
| 545 | { |
| 546 | ssize_t ret; |
| 547 | |
| 548 | update_turbo_state(); |
| 549 | if (limits.turbo_disabled) |
| 550 | ret = sprintf(buf, "%u\n", limits.turbo_disabled); |
| 551 | else |
| 552 | ret = sprintf(buf, "%u\n", limits.no_turbo); |
| 553 | |
| 554 | return ret; |
| 555 | } |
| 556 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 557 | static ssize_t store_no_turbo(struct kobject *a, struct attribute *b, |
Stratos Karafotis | c410833 | 2014-07-18 08:37:23 -0700 | [diff] [blame] | 558 | const char *buf, size_t count) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 559 | { |
| 560 | unsigned int input; |
| 561 | int ret; |
Stratos Karafotis | 845c1cb | 2014-07-18 08:37:19 -0700 | [diff] [blame] | 562 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 563 | ret = sscanf(buf, "%u", &input); |
| 564 | if (ret != 1) |
| 565 | return -EINVAL; |
Gabriele Mazzotta | 4521e1a0 | 2014-10-13 08:37:41 -0700 | [diff] [blame] | 566 | |
| 567 | update_turbo_state(); |
Dirk Brandewie | dd5fbf7 | 2014-06-20 07:27:59 -0700 | [diff] [blame] | 568 | if (limits.turbo_disabled) { |
Doug Smythies | f16255e | 2015-05-31 07:46:47 -0700 | [diff] [blame] | 569 | pr_warn("intel_pstate: Turbo disabled by BIOS or unavailable on processor\n"); |
Gabriele Mazzotta | 4521e1a0 | 2014-10-13 08:37:41 -0700 | [diff] [blame] | 570 | return -EPERM; |
Dirk Brandewie | dd5fbf7 | 2014-06-20 07:27:59 -0700 | [diff] [blame] | 571 | } |
Dirk Brandewie | 2f86dc4 | 2014-11-06 09:40:47 -0800 | [diff] [blame] | 572 | |
Gabriele Mazzotta | 4521e1a0 | 2014-10-13 08:37:41 -0700 | [diff] [blame] | 573 | limits.no_turbo = clamp_t(int, input, 0, 1); |
| 574 | |
Dirk Brandewie | 2f86dc4 | 2014-11-06 09:40:47 -0800 | [diff] [blame] | 575 | if (hwp_active) |
| 576 | intel_pstate_hwp_set(); |
| 577 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 578 | return count; |
| 579 | } |
| 580 | |
| 581 | static ssize_t store_max_perf_pct(struct kobject *a, struct attribute *b, |
Stratos Karafotis | c410833 | 2014-07-18 08:37:23 -0700 | [diff] [blame] | 582 | const char *buf, size_t count) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 583 | { |
| 584 | unsigned int input; |
| 585 | int ret; |
Stratos Karafotis | 845c1cb | 2014-07-18 08:37:19 -0700 | [diff] [blame] | 586 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 587 | ret = sscanf(buf, "%u", &input); |
| 588 | if (ret != 1) |
| 589 | return -EINVAL; |
| 590 | |
Dirk Brandewie | d8f469e | 2013-05-07 08:20:26 -0700 | [diff] [blame] | 591 | limits.max_sysfs_pct = clamp_t(int, input, 0 , 100); |
| 592 | limits.max_perf_pct = min(limits.max_policy_pct, limits.max_sysfs_pct); |
Chen Yu | 43717aa | 2015-09-09 18:27:31 +0800 | [diff] [blame] | 593 | limits.max_perf_pct = max(limits.min_policy_pct, limits.max_perf_pct); |
| 594 | limits.max_perf_pct = max(limits.min_perf_pct, limits.max_perf_pct); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 595 | limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100)); |
Stratos Karafotis | 845c1cb | 2014-07-18 08:37:19 -0700 | [diff] [blame] | 596 | |
Dirk Brandewie | 2f86dc4 | 2014-11-06 09:40:47 -0800 | [diff] [blame] | 597 | if (hwp_active) |
| 598 | intel_pstate_hwp_set(); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 599 | return count; |
| 600 | } |
| 601 | |
| 602 | static ssize_t store_min_perf_pct(struct kobject *a, struct attribute *b, |
Stratos Karafotis | c410833 | 2014-07-18 08:37:23 -0700 | [diff] [blame] | 603 | const char *buf, size_t count) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 604 | { |
| 605 | unsigned int input; |
| 606 | int ret; |
Stratos Karafotis | 845c1cb | 2014-07-18 08:37:19 -0700 | [diff] [blame] | 607 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 608 | ret = sscanf(buf, "%u", &input); |
| 609 | if (ret != 1) |
| 610 | return -EINVAL; |
Kristen Carlson Accardi | a047599 | 2015-01-29 13:03:52 -0800 | [diff] [blame] | 611 | |
| 612 | limits.min_sysfs_pct = clamp_t(int, input, 0 , 100); |
| 613 | limits.min_perf_pct = max(limits.min_policy_pct, limits.min_sysfs_pct); |
Chen Yu | 43717aa | 2015-09-09 18:27:31 +0800 | [diff] [blame] | 614 | limits.min_perf_pct = min(limits.max_policy_pct, limits.min_perf_pct); |
| 615 | limits.min_perf_pct = min(limits.max_perf_pct, limits.min_perf_pct); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 616 | limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100)); |
| 617 | |
Dirk Brandewie | 2f86dc4 | 2014-11-06 09:40:47 -0800 | [diff] [blame] | 618 | if (hwp_active) |
| 619 | intel_pstate_hwp_set(); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 620 | return count; |
| 621 | } |
| 622 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 623 | show_one(max_perf_pct, max_perf_pct); |
| 624 | show_one(min_perf_pct, min_perf_pct); |
| 625 | |
| 626 | define_one_global_rw(no_turbo); |
| 627 | define_one_global_rw(max_perf_pct); |
| 628 | define_one_global_rw(min_perf_pct); |
Kristen Carlson Accardi | d01b1f4 | 2015-01-28 15:03:27 -0800 | [diff] [blame] | 629 | define_one_global_ro(turbo_pct); |
Kristen Carlson Accardi | 0522424 | 2015-01-28 15:03:28 -0800 | [diff] [blame] | 630 | define_one_global_ro(num_pstates); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 631 | |
| 632 | static struct attribute *intel_pstate_attributes[] = { |
| 633 | &no_turbo.attr, |
| 634 | &max_perf_pct.attr, |
| 635 | &min_perf_pct.attr, |
Kristen Carlson Accardi | d01b1f4 | 2015-01-28 15:03:27 -0800 | [diff] [blame] | 636 | &turbo_pct.attr, |
Kristen Carlson Accardi | 0522424 | 2015-01-28 15:03:28 -0800 | [diff] [blame] | 637 | &num_pstates.attr, |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 638 | NULL |
| 639 | }; |
| 640 | |
| 641 | static struct attribute_group intel_pstate_attr_group = { |
| 642 | .attrs = intel_pstate_attributes, |
| 643 | }; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 644 | |
Stratos Karafotis | 317dd50 | 2014-07-18 08:37:17 -0700 | [diff] [blame] | 645 | static void __init intel_pstate_sysfs_expose_params(void) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 646 | { |
Stratos Karafotis | 317dd50 | 2014-07-18 08:37:17 -0700 | [diff] [blame] | 647 | struct kobject *intel_pstate_kobject; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 648 | int rc; |
| 649 | |
| 650 | intel_pstate_kobject = kobject_create_and_add("intel_pstate", |
| 651 | &cpu_subsys.dev_root->kobj); |
| 652 | BUG_ON(!intel_pstate_kobject); |
Stratos Karafotis | 2d8d1f1 | 2014-07-18 08:37:20 -0700 | [diff] [blame] | 653 | rc = sysfs_create_group(intel_pstate_kobject, &intel_pstate_attr_group); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 654 | BUG_ON(rc); |
| 655 | } |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 656 | /************************** sysfs end ************************/ |
Dirk Brandewie | 2f86dc4 | 2014-11-06 09:40:47 -0800 | [diff] [blame] | 657 | |
Kristen Carlson Accardi | ba88d43 | 2015-07-14 09:46:23 -0700 | [diff] [blame] | 658 | static void intel_pstate_hwp_enable(struct cpudata *cpudata) |
Dirk Brandewie | 2f86dc4 | 2014-11-06 09:40:47 -0800 | [diff] [blame] | 659 | { |
Doug Smythies | f16255e | 2015-05-31 07:46:47 -0700 | [diff] [blame] | 660 | pr_info("intel_pstate: HWP enabled\n"); |
Dirk Brandewie | 2f86dc4 | 2014-11-06 09:40:47 -0800 | [diff] [blame] | 661 | |
Kristen Carlson Accardi | ba88d43 | 2015-07-14 09:46:23 -0700 | [diff] [blame] | 662 | wrmsrl_on_cpu(cpudata->cpu, MSR_PM_ENABLE, 0x1); |
Dirk Brandewie | 2f86dc4 | 2014-11-06 09:40:47 -0800 | [diff] [blame] | 663 | } |
| 664 | |
Dirk Brandewie | 19e77c2 | 2013-10-21 09:20:35 -0700 | [diff] [blame] | 665 | static int byt_get_min_pstate(void) |
| 666 | { |
| 667 | u64 value; |
Stratos Karafotis | 845c1cb | 2014-07-18 08:37:19 -0700 | [diff] [blame] | 668 | |
Dirk Brandewie | 19e77c2 | 2013-10-21 09:20:35 -0700 | [diff] [blame] | 669 | rdmsrl(BYT_RATIOS, value); |
Dirk Brandewie | c16ed06 | 2014-06-20 07:27:58 -0700 | [diff] [blame] | 670 | return (value >> 8) & 0x7F; |
Dirk Brandewie | 19e77c2 | 2013-10-21 09:20:35 -0700 | [diff] [blame] | 671 | } |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 672 | |
Dirk Brandewie | 19e77c2 | 2013-10-21 09:20:35 -0700 | [diff] [blame] | 673 | static int byt_get_max_pstate(void) |
| 674 | { |
| 675 | u64 value; |
Stratos Karafotis | 845c1cb | 2014-07-18 08:37:19 -0700 | [diff] [blame] | 676 | |
Dirk Brandewie | 19e77c2 | 2013-10-21 09:20:35 -0700 | [diff] [blame] | 677 | rdmsrl(BYT_RATIOS, value); |
Dirk Brandewie | c16ed06 | 2014-06-20 07:27:58 -0700 | [diff] [blame] | 678 | return (value >> 16) & 0x7F; |
Dirk Brandewie | 19e77c2 | 2013-10-21 09:20:35 -0700 | [diff] [blame] | 679 | } |
| 680 | |
Dirk Brandewie | 61d8d2a | 2014-02-12 10:01:07 -0800 | [diff] [blame] | 681 | static int byt_get_turbo_pstate(void) |
| 682 | { |
| 683 | u64 value; |
Stratos Karafotis | 845c1cb | 2014-07-18 08:37:19 -0700 | [diff] [blame] | 684 | |
Dirk Brandewie | 61d8d2a | 2014-02-12 10:01:07 -0800 | [diff] [blame] | 685 | rdmsrl(BYT_TURBO_RATIOS, value); |
Dirk Brandewie | c16ed06 | 2014-06-20 07:27:58 -0700 | [diff] [blame] | 686 | return value & 0x7F; |
Dirk Brandewie | 61d8d2a | 2014-02-12 10:01:07 -0800 | [diff] [blame] | 687 | } |
| 688 | |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 689 | static void byt_set_pstate(struct cpudata *cpudata, int pstate) |
| 690 | { |
| 691 | u64 val; |
| 692 | int32_t vid_fp; |
| 693 | u32 vid; |
| 694 | |
Chen Yu | 144c8e1 | 2015-07-29 23:53:10 +0800 | [diff] [blame] | 695 | val = (u64)pstate << 8; |
Dirk Brandewie | dd5fbf7 | 2014-06-20 07:27:59 -0700 | [diff] [blame] | 696 | if (limits.no_turbo && !limits.turbo_disabled) |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 697 | val |= (u64)1 << 32; |
| 698 | |
| 699 | vid_fp = cpudata->vid.min + mul_fp( |
| 700 | int_tofp(pstate - cpudata->pstate.min_pstate), |
| 701 | cpudata->vid.ratio); |
| 702 | |
| 703 | vid_fp = clamp_t(int32_t, vid_fp, cpudata->vid.min, cpudata->vid.max); |
Dirk Brandewie | d022a65 | 2014-10-13 08:37:44 -0700 | [diff] [blame] | 704 | vid = ceiling_fp(vid_fp); |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 705 | |
Dirk Brandewie | 21855ff | 2014-05-08 12:57:23 -0700 | [diff] [blame] | 706 | if (pstate > cpudata->pstate.max_pstate) |
| 707 | vid = cpudata->vid.turbo; |
| 708 | |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 709 | val |= vid; |
| 710 | |
Joe Konno | 0dd23f9 | 2015-05-12 07:59:42 -0700 | [diff] [blame] | 711 | wrmsrl_on_cpu(cpudata->cpu, MSR_IA32_PERF_CTL, val); |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 712 | } |
| 713 | |
Dirk Brandewie | b27580b | 2014-10-13 08:37:43 -0700 | [diff] [blame] | 714 | #define BYT_BCLK_FREQS 5 |
| 715 | static int byt_freq_table[BYT_BCLK_FREQS] = { 833, 1000, 1333, 1167, 800}; |
| 716 | |
| 717 | static int byt_get_scaling(void) |
| 718 | { |
| 719 | u64 value; |
| 720 | int i; |
| 721 | |
| 722 | rdmsrl(MSR_FSB_FREQ, value); |
| 723 | i = value & 0x3; |
| 724 | |
| 725 | BUG_ON(i > BYT_BCLK_FREQS); |
| 726 | |
| 727 | return byt_freq_table[i] * 100; |
| 728 | } |
| 729 | |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 730 | static void byt_get_vid(struct cpudata *cpudata) |
| 731 | { |
| 732 | u64 value; |
| 733 | |
| 734 | rdmsrl(BYT_VIDS, value); |
Dirk Brandewie | c16ed06 | 2014-06-20 07:27:58 -0700 | [diff] [blame] | 735 | cpudata->vid.min = int_tofp((value >> 8) & 0x7f); |
| 736 | cpudata->vid.max = int_tofp((value >> 16) & 0x7f); |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 737 | cpudata->vid.ratio = div_fp( |
| 738 | cpudata->vid.max - cpudata->vid.min, |
| 739 | int_tofp(cpudata->pstate.max_pstate - |
| 740 | cpudata->pstate.min_pstate)); |
Dirk Brandewie | 21855ff | 2014-05-08 12:57:23 -0700 | [diff] [blame] | 741 | |
| 742 | rdmsrl(BYT_TURBO_VIDS, value); |
| 743 | cpudata->vid.turbo = value & 0x7f; |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 744 | } |
| 745 | |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 746 | static int core_get_min_pstate(void) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 747 | { |
| 748 | u64 value; |
Stratos Karafotis | 845c1cb | 2014-07-18 08:37:19 -0700 | [diff] [blame] | 749 | |
Konrad Rzeszutek Wilk | 05e99c8cf | 2013-03-20 14:21:10 +0000 | [diff] [blame] | 750 | rdmsrl(MSR_PLATFORM_INFO, value); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 751 | return (value >> 40) & 0xFF; |
| 752 | } |
| 753 | |
Srinivas Pandruvada | 3bcc6fa | 2015-10-14 16:12:00 -0700 | [diff] [blame] | 754 | static int core_get_max_pstate_physical(void) |
| 755 | { |
| 756 | u64 value; |
| 757 | |
| 758 | rdmsrl(MSR_PLATFORM_INFO, value); |
| 759 | return (value >> 8) & 0xFF; |
| 760 | } |
| 761 | |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 762 | static int core_get_max_pstate(void) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 763 | { |
Srinivas Pandruvada | 6a35fc2 | 2015-10-14 16:11:59 -0700 | [diff] [blame] | 764 | u64 tar; |
| 765 | u64 plat_info; |
| 766 | int max_pstate; |
| 767 | int err; |
Stratos Karafotis | 845c1cb | 2014-07-18 08:37:19 -0700 | [diff] [blame] | 768 | |
Srinivas Pandruvada | 6a35fc2 | 2015-10-14 16:11:59 -0700 | [diff] [blame] | 769 | rdmsrl(MSR_PLATFORM_INFO, plat_info); |
| 770 | max_pstate = (plat_info >> 8) & 0xFF; |
| 771 | |
| 772 | err = rdmsrl_safe(MSR_TURBO_ACTIVATION_RATIO, &tar); |
| 773 | if (!err) { |
| 774 | /* Do some sanity checking for safety */ |
| 775 | if (plat_info & 0x600000000) { |
| 776 | u64 tdp_ctrl; |
| 777 | u64 tdp_ratio; |
| 778 | int tdp_msr; |
| 779 | |
| 780 | err = rdmsrl_safe(MSR_CONFIG_TDP_CONTROL, &tdp_ctrl); |
| 781 | if (err) |
| 782 | goto skip_tar; |
| 783 | |
| 784 | tdp_msr = MSR_CONFIG_TDP_NOMINAL + tdp_ctrl; |
| 785 | err = rdmsrl_safe(tdp_msr, &tdp_ratio); |
| 786 | if (err) |
| 787 | goto skip_tar; |
| 788 | |
| 789 | if (tdp_ratio - 1 == tar) { |
| 790 | max_pstate = tar; |
| 791 | pr_debug("max_pstate=TAC %x\n", max_pstate); |
| 792 | } else { |
| 793 | goto skip_tar; |
| 794 | } |
| 795 | } |
| 796 | } |
| 797 | |
| 798 | skip_tar: |
| 799 | return max_pstate; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 800 | } |
| 801 | |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 802 | static int core_get_turbo_pstate(void) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 803 | { |
| 804 | u64 value; |
| 805 | int nont, ret; |
Stratos Karafotis | 845c1cb | 2014-07-18 08:37:19 -0700 | [diff] [blame] | 806 | |
Konrad Rzeszutek Wilk | 05e99c8cf | 2013-03-20 14:21:10 +0000 | [diff] [blame] | 807 | rdmsrl(MSR_NHM_TURBO_RATIO_LIMIT, value); |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 808 | nont = core_get_max_pstate(); |
Stratos Karafotis | 285cb99 | 2014-07-18 08:37:21 -0700 | [diff] [blame] | 809 | ret = (value) & 255; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 810 | if (ret <= nont) |
| 811 | ret = nont; |
| 812 | return ret; |
| 813 | } |
| 814 | |
Dirk Brandewie | b27580b | 2014-10-13 08:37:43 -0700 | [diff] [blame] | 815 | static inline int core_get_scaling(void) |
| 816 | { |
| 817 | return 100000; |
| 818 | } |
| 819 | |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 820 | static void core_set_pstate(struct cpudata *cpudata, int pstate) |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 821 | { |
| 822 | u64 val; |
| 823 | |
Chen Yu | 144c8e1 | 2015-07-29 23:53:10 +0800 | [diff] [blame] | 824 | val = (u64)pstate << 8; |
Dirk Brandewie | dd5fbf7 | 2014-06-20 07:27:59 -0700 | [diff] [blame] | 825 | if (limits.no_turbo && !limits.turbo_disabled) |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 826 | val |= (u64)1 << 32; |
| 827 | |
Dirk Brandewie | bb18008 | 2014-03-19 08:45:54 -0700 | [diff] [blame] | 828 | wrmsrl_on_cpu(cpudata->cpu, MSR_IA32_PERF_CTL, val); |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 829 | } |
| 830 | |
Dasaratharaman Chandramouli | b34ef93 | 2015-04-10 10:22:18 -0700 | [diff] [blame] | 831 | static int knl_get_turbo_pstate(void) |
| 832 | { |
| 833 | u64 value; |
| 834 | int nont, ret; |
| 835 | |
| 836 | rdmsrl(MSR_NHM_TURBO_RATIO_LIMIT, value); |
| 837 | nont = core_get_max_pstate(); |
| 838 | ret = (((value) >> 8) & 0xFF); |
| 839 | if (ret <= nont) |
| 840 | ret = nont; |
| 841 | return ret; |
| 842 | } |
| 843 | |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 844 | static struct cpu_defaults core_params = { |
| 845 | .pid_policy = { |
| 846 | .sample_rate_ms = 10, |
| 847 | .deadband = 0, |
| 848 | .setpoint = 97, |
| 849 | .p_gain_pct = 20, |
| 850 | .d_gain_pct = 0, |
| 851 | .i_gain_pct = 0, |
| 852 | }, |
| 853 | .funcs = { |
| 854 | .get_max = core_get_max_pstate, |
Srinivas Pandruvada | 3bcc6fa | 2015-10-14 16:12:00 -0700 | [diff] [blame] | 855 | .get_max_physical = core_get_max_pstate_physical, |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 856 | .get_min = core_get_min_pstate, |
| 857 | .get_turbo = core_get_turbo_pstate, |
Dirk Brandewie | b27580b | 2014-10-13 08:37:43 -0700 | [diff] [blame] | 858 | .get_scaling = core_get_scaling, |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 859 | .set = core_set_pstate, |
| 860 | }, |
| 861 | }; |
| 862 | |
Dirk Brandewie | 19e77c2 | 2013-10-21 09:20:35 -0700 | [diff] [blame] | 863 | static struct cpu_defaults byt_params = { |
| 864 | .pid_policy = { |
| 865 | .sample_rate_ms = 10, |
| 866 | .deadband = 0, |
Kristen Carlson Accardi | 6a82ba6 | 2015-04-10 11:06:43 -0700 | [diff] [blame] | 867 | .setpoint = 60, |
Dirk Brandewie | 19e77c2 | 2013-10-21 09:20:35 -0700 | [diff] [blame] | 868 | .p_gain_pct = 14, |
| 869 | .d_gain_pct = 0, |
| 870 | .i_gain_pct = 4, |
| 871 | }, |
| 872 | .funcs = { |
| 873 | .get_max = byt_get_max_pstate, |
Srinivas Pandruvada | 3bcc6fa | 2015-10-14 16:12:00 -0700 | [diff] [blame] | 874 | .get_max_physical = byt_get_max_pstate, |
Dirk Brandewie | 19e77c2 | 2013-10-21 09:20:35 -0700 | [diff] [blame] | 875 | .get_min = byt_get_min_pstate, |
Dirk Brandewie | 61d8d2a | 2014-02-12 10:01:07 -0800 | [diff] [blame] | 876 | .get_turbo = byt_get_turbo_pstate, |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 877 | .set = byt_set_pstate, |
Dirk Brandewie | b27580b | 2014-10-13 08:37:43 -0700 | [diff] [blame] | 878 | .get_scaling = byt_get_scaling, |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 879 | .get_vid = byt_get_vid, |
Dirk Brandewie | 19e77c2 | 2013-10-21 09:20:35 -0700 | [diff] [blame] | 880 | }, |
| 881 | }; |
| 882 | |
Dasaratharaman Chandramouli | b34ef93 | 2015-04-10 10:22:18 -0700 | [diff] [blame] | 883 | static struct cpu_defaults knl_params = { |
| 884 | .pid_policy = { |
| 885 | .sample_rate_ms = 10, |
| 886 | .deadband = 0, |
| 887 | .setpoint = 97, |
| 888 | .p_gain_pct = 20, |
| 889 | .d_gain_pct = 0, |
| 890 | .i_gain_pct = 0, |
| 891 | }, |
| 892 | .funcs = { |
| 893 | .get_max = core_get_max_pstate, |
Srinivas Pandruvada | 3bcc6fa | 2015-10-14 16:12:00 -0700 | [diff] [blame] | 894 | .get_max_physical = core_get_max_pstate_physical, |
Dasaratharaman Chandramouli | b34ef93 | 2015-04-10 10:22:18 -0700 | [diff] [blame] | 895 | .get_min = core_get_min_pstate, |
| 896 | .get_turbo = knl_get_turbo_pstate, |
Lukasz Anaczkowski | 69cefc2 | 2015-07-21 10:41:13 +0200 | [diff] [blame] | 897 | .get_scaling = core_get_scaling, |
Dasaratharaman Chandramouli | b34ef93 | 2015-04-10 10:22:18 -0700 | [diff] [blame] | 898 | .set = core_set_pstate, |
| 899 | }, |
| 900 | }; |
| 901 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 902 | static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max) |
| 903 | { |
| 904 | int max_perf = cpu->pstate.turbo_pstate; |
Dirk Brandewie | 7244cb6 | 2013-10-21 09:20:33 -0700 | [diff] [blame] | 905 | int max_perf_adj; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 906 | int min_perf; |
Stratos Karafotis | 845c1cb | 2014-07-18 08:37:19 -0700 | [diff] [blame] | 907 | |
Gabriele Mazzotta | 4521e1a0 | 2014-10-13 08:37:41 -0700 | [diff] [blame] | 908 | if (limits.no_turbo || limits.turbo_disabled) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 909 | max_perf = cpu->pstate.max_pstate; |
| 910 | |
Kristen Carlson Accardi | e0d4c8f | 2014-12-10 12:39:38 -0800 | [diff] [blame] | 911 | /* |
| 912 | * performance can be limited by user through sysfs, by cpufreq |
| 913 | * policy, or by cpu specific default values determined through |
| 914 | * experimentation. |
| 915 | */ |
Srinivas Pandruvada | 4ef4514 | 2015-10-14 16:12:03 -0700 | [diff] [blame^] | 916 | if (limits.max_perf_ctl && limits.max_sysfs_pct >= |
| 917 | limits.max_policy_pct) { |
| 918 | *max = limits.max_perf_ctl; |
| 919 | } else { |
| 920 | max_perf_adj = fp_toint(mul_fp(int_tofp(max_perf), |
| 921 | limits.max_perf)); |
| 922 | *max = clamp_t(int, max_perf_adj, cpu->pstate.min_pstate, |
| 923 | cpu->pstate.turbo_pstate); |
| 924 | } |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 925 | |
Srinivas Pandruvada | 4ef4514 | 2015-10-14 16:12:03 -0700 | [diff] [blame^] | 926 | if (limits.min_perf_ctl) { |
| 927 | *min = limits.min_perf_ctl; |
| 928 | } else { |
| 929 | min_perf = fp_toint(mul_fp(int_tofp(max_perf), |
| 930 | limits.min_perf)); |
| 931 | *min = clamp_t(int, min_perf, cpu->pstate.min_pstate, max_perf); |
| 932 | } |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 933 | } |
| 934 | |
Doug Smythies | 6c1e459 | 2015-06-01 21:12:34 -0700 | [diff] [blame] | 935 | static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate, bool force) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 936 | { |
| 937 | int max_perf, min_perf; |
| 938 | |
Doug Smythies | 6c1e459 | 2015-06-01 21:12:34 -0700 | [diff] [blame] | 939 | if (force) { |
| 940 | update_turbo_state(); |
Gabriele Mazzotta | 4521e1a0 | 2014-10-13 08:37:41 -0700 | [diff] [blame] | 941 | |
Doug Smythies | 6c1e459 | 2015-06-01 21:12:34 -0700 | [diff] [blame] | 942 | intel_pstate_get_min_max(cpu, &min_perf, &max_perf); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 943 | |
Doug Smythies | 6c1e459 | 2015-06-01 21:12:34 -0700 | [diff] [blame] | 944 | pstate = clamp_t(int, pstate, min_perf, max_perf); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 945 | |
Doug Smythies | 6c1e459 | 2015-06-01 21:12:34 -0700 | [diff] [blame] | 946 | if (pstate == cpu->pstate.current_pstate) |
| 947 | return; |
| 948 | } |
Dirk Brandewie | b27580b | 2014-10-13 08:37:43 -0700 | [diff] [blame] | 949 | trace_cpu_frequency(pstate * cpu->pstate.scaling, cpu->cpu); |
Dirk Brandewie | 35363e9 | 2013-05-07 08:20:30 -0700 | [diff] [blame] | 950 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 951 | cpu->pstate.current_pstate = pstate; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 952 | |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 953 | pstate_funcs.set(cpu, pstate); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 954 | } |
| 955 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 956 | static void intel_pstate_get_cpu_pstates(struct cpudata *cpu) |
| 957 | { |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 958 | cpu->pstate.min_pstate = pstate_funcs.get_min(); |
| 959 | cpu->pstate.max_pstate = pstate_funcs.get_max(); |
Srinivas Pandruvada | 3bcc6fa | 2015-10-14 16:12:00 -0700 | [diff] [blame] | 960 | cpu->pstate.max_pstate_physical = pstate_funcs.get_max_physical(); |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 961 | cpu->pstate.turbo_pstate = pstate_funcs.get_turbo(); |
Dirk Brandewie | b27580b | 2014-10-13 08:37:43 -0700 | [diff] [blame] | 962 | cpu->pstate.scaling = pstate_funcs.get_scaling(); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 963 | |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 964 | if (pstate_funcs.get_vid) |
| 965 | pstate_funcs.get_vid(cpu); |
Doug Smythies | 6c1e459 | 2015-06-01 21:12:34 -0700 | [diff] [blame] | 966 | intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate, false); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 967 | } |
| 968 | |
Stratos Karafotis | 6b17ddb | 2014-04-29 20:53:49 +0300 | [diff] [blame] | 969 | static inline void intel_pstate_calc_busy(struct cpudata *cpu) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 970 | { |
Stratos Karafotis | 6b17ddb | 2014-04-29 20:53:49 +0300 | [diff] [blame] | 971 | struct sample *sample = &cpu->sample; |
Doug Smythies | bf81022 | 2014-05-30 10:10:57 -0700 | [diff] [blame] | 972 | int64_t core_pct; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 973 | |
Doug Smythies | bf81022 | 2014-05-30 10:10:57 -0700 | [diff] [blame] | 974 | core_pct = int_tofp(sample->aperf) * int_tofp(100); |
Stratos Karafotis | 78e2708 | 2014-07-18 08:37:27 -0700 | [diff] [blame] | 975 | core_pct = div64_u64(core_pct, int_tofp(sample->mperf)); |
Dirk Brandewie | fcb6a15 | 2014-02-03 08:55:31 -0800 | [diff] [blame] | 976 | |
Dirk Brandewie | fcb6a15 | 2014-02-03 08:55:31 -0800 | [diff] [blame] | 977 | sample->freq = fp_toint( |
Dirk Brandewie | b27580b | 2014-10-13 08:37:43 -0700 | [diff] [blame] | 978 | mul_fp(int_tofp( |
Srinivas Pandruvada | 3bcc6fa | 2015-10-14 16:12:00 -0700 | [diff] [blame] | 979 | cpu->pstate.max_pstate_physical * |
| 980 | cpu->pstate.scaling / 100), |
Dirk Brandewie | b27580b | 2014-10-13 08:37:43 -0700 | [diff] [blame] | 981 | core_pct)); |
Dirk Brandewie | fcb6a15 | 2014-02-03 08:55:31 -0800 | [diff] [blame] | 982 | |
Doug Smythies | bf81022 | 2014-05-30 10:10:57 -0700 | [diff] [blame] | 983 | sample->core_pct_busy = (int32_t)core_pct; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 984 | } |
| 985 | |
| 986 | static inline void intel_pstate_sample(struct cpudata *cpu) |
| 987 | { |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 988 | u64 aperf, mperf; |
Stratos Karafotis | 4ab60c3 | 2014-07-18 08:37:24 -0700 | [diff] [blame] | 989 | unsigned long flags; |
Doug Smythies | 4055fad | 2015-04-11 21:10:26 -0700 | [diff] [blame] | 990 | u64 tsc; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 991 | |
Stratos Karafotis | 4ab60c3 | 2014-07-18 08:37:24 -0700 | [diff] [blame] | 992 | local_irq_save(flags); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 993 | rdmsrl(MSR_IA32_APERF, aperf); |
| 994 | rdmsrl(MSR_IA32_MPERF, mperf); |
Andy Lutomirski | 4ea1636 | 2015-06-25 18:44:07 +0200 | [diff] [blame] | 995 | tsc = rdtsc(); |
Stratos Karafotis | 4ab60c3 | 2014-07-18 08:37:24 -0700 | [diff] [blame] | 996 | local_irq_restore(flags); |
Dirk Brandewie | b69880f | 2014-01-16 10:32:25 -0800 | [diff] [blame] | 997 | |
Dirk Brandewie | c4ee841 | 2014-05-29 09:32:24 -0700 | [diff] [blame] | 998 | cpu->last_sample_time = cpu->sample.time; |
| 999 | cpu->sample.time = ktime_get(); |
Dirk Brandewie | d37e2b7 | 2014-02-12 10:01:04 -0800 | [diff] [blame] | 1000 | cpu->sample.aperf = aperf; |
| 1001 | cpu->sample.mperf = mperf; |
Doug Smythies | 4055fad | 2015-04-11 21:10:26 -0700 | [diff] [blame] | 1002 | cpu->sample.tsc = tsc; |
Dirk Brandewie | d37e2b7 | 2014-02-12 10:01:04 -0800 | [diff] [blame] | 1003 | cpu->sample.aperf -= cpu->prev_aperf; |
| 1004 | cpu->sample.mperf -= cpu->prev_mperf; |
Doug Smythies | 4055fad | 2015-04-11 21:10:26 -0700 | [diff] [blame] | 1005 | cpu->sample.tsc -= cpu->prev_tsc; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1006 | |
Stratos Karafotis | 6b17ddb | 2014-04-29 20:53:49 +0300 | [diff] [blame] | 1007 | intel_pstate_calc_busy(cpu); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1008 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1009 | cpu->prev_aperf = aperf; |
| 1010 | cpu->prev_mperf = mperf; |
Doug Smythies | 4055fad | 2015-04-11 21:10:26 -0700 | [diff] [blame] | 1011 | cpu->prev_tsc = tsc; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1012 | } |
| 1013 | |
Dirk Brandewie | 2f86dc4 | 2014-11-06 09:40:47 -0800 | [diff] [blame] | 1014 | static inline void intel_hwp_set_sample_time(struct cpudata *cpu) |
| 1015 | { |
| 1016 | int delay; |
| 1017 | |
| 1018 | delay = msecs_to_jiffies(50); |
| 1019 | mod_timer_pinned(&cpu->timer, jiffies + delay); |
| 1020 | } |
| 1021 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1022 | static inline void intel_pstate_set_sample_time(struct cpudata *cpu) |
| 1023 | { |
Stratos Karafotis | abf013b | 2014-07-18 08:37:22 -0700 | [diff] [blame] | 1024 | int delay; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1025 | |
Stratos Karafotis | abf013b | 2014-07-18 08:37:22 -0700 | [diff] [blame] | 1026 | delay = msecs_to_jiffies(pid_params.sample_rate_ms); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1027 | mod_timer_pinned(&cpu->timer, jiffies + delay); |
| 1028 | } |
| 1029 | |
Brennan Shacklett | d253d2a | 2013-10-21 09:20:32 -0700 | [diff] [blame] | 1030 | static inline int32_t intel_pstate_get_scaled_busy(struct cpudata *cpu) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1031 | { |
Dirk Brandewie | c4ee841 | 2014-05-29 09:32:24 -0700 | [diff] [blame] | 1032 | int32_t core_busy, max_pstate, current_pstate, sample_ratio; |
Prarit Bhargava | 7180ddd | 2015-06-15 13:43:29 -0400 | [diff] [blame] | 1033 | s64 duration_us; |
Dirk Brandewie | c4ee841 | 2014-05-29 09:32:24 -0700 | [diff] [blame] | 1034 | u32 sample_time; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1035 | |
Kristen Carlson Accardi | e0d4c8f | 2014-12-10 12:39:38 -0800 | [diff] [blame] | 1036 | /* |
| 1037 | * core_busy is the ratio of actual performance to max |
| 1038 | * max_pstate is the max non turbo pstate available |
| 1039 | * current_pstate was the pstate that was requested during |
| 1040 | * the last sample period. |
| 1041 | * |
| 1042 | * We normalize core_busy, which was our actual percent |
| 1043 | * performance to what we requested during the last sample |
| 1044 | * period. The result will be a percentage of busy at a |
| 1045 | * specified pstate. |
| 1046 | */ |
Dirk Brandewie | d37e2b7 | 2014-02-12 10:01:04 -0800 | [diff] [blame] | 1047 | core_busy = cpu->sample.core_pct_busy; |
Srinivas Pandruvada | 3bcc6fa | 2015-10-14 16:12:00 -0700 | [diff] [blame] | 1048 | max_pstate = int_tofp(cpu->pstate.max_pstate_physical); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1049 | current_pstate = int_tofp(cpu->pstate.current_pstate); |
Dirk Brandewie | e66c176 | 2014-02-25 10:35:37 -0800 | [diff] [blame] | 1050 | core_busy = mul_fp(core_busy, div_fp(max_pstate, current_pstate)); |
Dirk Brandewie | c4ee841 | 2014-05-29 09:32:24 -0700 | [diff] [blame] | 1051 | |
Kristen Carlson Accardi | e0d4c8f | 2014-12-10 12:39:38 -0800 | [diff] [blame] | 1052 | /* |
| 1053 | * Since we have a deferred timer, it will not fire unless |
| 1054 | * we are in C0. So, determine if the actual elapsed time |
| 1055 | * is significantly greater (3x) than our sample interval. If it |
| 1056 | * is, then we were idle for a long enough period of time |
| 1057 | * to adjust our busyness. |
| 1058 | */ |
Stratos Karafotis | 285cb99 | 2014-07-18 08:37:21 -0700 | [diff] [blame] | 1059 | sample_time = pid_params.sample_rate_ms * USEC_PER_MSEC; |
Prarit Bhargava | 7180ddd | 2015-06-15 13:43:29 -0400 | [diff] [blame] | 1060 | duration_us = ktime_us_delta(cpu->sample.time, |
| 1061 | cpu->last_sample_time); |
Dirk Brandewie | c4ee841 | 2014-05-29 09:32:24 -0700 | [diff] [blame] | 1062 | if (duration_us > sample_time * 3) { |
| 1063 | sample_ratio = div_fp(int_tofp(sample_time), |
Stratos Karafotis | c410833 | 2014-07-18 08:37:23 -0700 | [diff] [blame] | 1064 | int_tofp(duration_us)); |
Dirk Brandewie | c4ee841 | 2014-05-29 09:32:24 -0700 | [diff] [blame] | 1065 | core_busy = mul_fp(core_busy, sample_ratio); |
| 1066 | } |
| 1067 | |
Dirk Brandewie | f0fe3cd | 2014-05-29 09:32:23 -0700 | [diff] [blame] | 1068 | return core_busy; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1069 | } |
| 1070 | |
| 1071 | static inline void intel_pstate_adjust_busy_pstate(struct cpudata *cpu) |
| 1072 | { |
Brennan Shacklett | d253d2a | 2013-10-21 09:20:32 -0700 | [diff] [blame] | 1073 | int32_t busy_scaled; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1074 | struct _pid *pid; |
Stratos Karafotis | 4b707c8 | 2014-07-18 08:37:26 -0700 | [diff] [blame] | 1075 | signed int ctl; |
Doug Smythies | 4055fad | 2015-04-11 21:10:26 -0700 | [diff] [blame] | 1076 | int from; |
| 1077 | struct sample *sample; |
| 1078 | |
| 1079 | from = cpu->pstate.current_pstate; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1080 | |
| 1081 | pid = &cpu->pid; |
| 1082 | busy_scaled = intel_pstate_get_scaled_busy(cpu); |
| 1083 | |
| 1084 | ctl = pid_calc(pid, busy_scaled); |
| 1085 | |
Stratos Karafotis | 4b707c8 | 2014-07-18 08:37:26 -0700 | [diff] [blame] | 1086 | /* Negative values of ctl increase the pstate and vice versa */ |
Doug Smythies | 6c1e459 | 2015-06-01 21:12:34 -0700 | [diff] [blame] | 1087 | intel_pstate_set_pstate(cpu, cpu->pstate.current_pstate - ctl, true); |
Doug Smythies | 4055fad | 2015-04-11 21:10:26 -0700 | [diff] [blame] | 1088 | |
| 1089 | sample = &cpu->sample; |
| 1090 | trace_pstate_sample(fp_toint(sample->core_pct_busy), |
| 1091 | fp_toint(busy_scaled), |
| 1092 | from, |
| 1093 | cpu->pstate.current_pstate, |
| 1094 | sample->mperf, |
| 1095 | sample->aperf, |
| 1096 | sample->tsc, |
| 1097 | sample->freq); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1098 | } |
| 1099 | |
Dirk Brandewie | 2f86dc4 | 2014-11-06 09:40:47 -0800 | [diff] [blame] | 1100 | static void intel_hwp_timer_func(unsigned long __data) |
| 1101 | { |
| 1102 | struct cpudata *cpu = (struct cpudata *) __data; |
| 1103 | |
| 1104 | intel_pstate_sample(cpu); |
| 1105 | intel_hwp_set_sample_time(cpu); |
| 1106 | } |
| 1107 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1108 | static void intel_pstate_timer_func(unsigned long __data) |
| 1109 | { |
| 1110 | struct cpudata *cpu = (struct cpudata *) __data; |
| 1111 | |
| 1112 | intel_pstate_sample(cpu); |
Dirk Brandewie | b69880f | 2014-01-16 10:32:25 -0800 | [diff] [blame] | 1113 | |
Dirk Brandewie | ca182ae | 2013-05-07 08:20:27 -0700 | [diff] [blame] | 1114 | intel_pstate_adjust_busy_pstate(cpu); |
Dirk Brandewie | b69880f | 2014-01-16 10:32:25 -0800 | [diff] [blame] | 1115 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1116 | intel_pstate_set_sample_time(cpu); |
| 1117 | } |
| 1118 | |
| 1119 | #define ICPU(model, policy) \ |
Dirk Brandewie | 6cbd7ee | 2014-01-06 10:59:16 -0800 | [diff] [blame] | 1120 | { X86_VENDOR_INTEL, 6, model, X86_FEATURE_APERFMPERF,\ |
| 1121 | (unsigned long)&policy } |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1122 | |
| 1123 | static const struct x86_cpu_id intel_pstate_cpu_ids[] = { |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 1124 | ICPU(0x2a, core_params), |
| 1125 | ICPU(0x2d, core_params), |
Dirk Brandewie | 19e77c2 | 2013-10-21 09:20:35 -0700 | [diff] [blame] | 1126 | ICPU(0x37, byt_params), |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 1127 | ICPU(0x3a, core_params), |
| 1128 | ICPU(0x3c, core_params), |
Dirk Brandewie | c7e241d | 2014-05-08 12:57:27 -0700 | [diff] [blame] | 1129 | ICPU(0x3d, core_params), |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 1130 | ICPU(0x3e, core_params), |
| 1131 | ICPU(0x3f, core_params), |
| 1132 | ICPU(0x45, core_params), |
| 1133 | ICPU(0x46, core_params), |
Dirk Brandewie | 43f8a96 | 2014-11-06 09:50:45 -0800 | [diff] [blame] | 1134 | ICPU(0x47, core_params), |
Mika Westerberg | 16405f9 | 2014-08-22 13:05:44 +0300 | [diff] [blame] | 1135 | ICPU(0x4c, byt_params), |
Kristen Carlson Accardi | 7ab0256 | 2015-01-28 13:53:28 -0800 | [diff] [blame] | 1136 | ICPU(0x4e, core_params), |
Dirk Brandewie | c7e241d | 2014-05-08 12:57:27 -0700 | [diff] [blame] | 1137 | ICPU(0x4f, core_params), |
Kristen Carlson Accardi | 1c93912 | 2015-08-05 12:47:14 -0700 | [diff] [blame] | 1138 | ICPU(0x5e, core_params), |
Dirk Brandewie | c7e241d | 2014-05-08 12:57:27 -0700 | [diff] [blame] | 1139 | ICPU(0x56, core_params), |
Dasaratharaman Chandramouli | b34ef93 | 2015-04-10 10:22:18 -0700 | [diff] [blame] | 1140 | ICPU(0x57, knl_params), |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1141 | {} |
| 1142 | }; |
| 1143 | MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids); |
| 1144 | |
Dirk Brandewie | 2f86dc4 | 2014-11-06 09:40:47 -0800 | [diff] [blame] | 1145 | static const struct x86_cpu_id intel_pstate_cpu_oob_ids[] = { |
| 1146 | ICPU(0x56, core_params), |
| 1147 | {} |
| 1148 | }; |
| 1149 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1150 | static int intel_pstate_init_cpu(unsigned int cpunum) |
| 1151 | { |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1152 | struct cpudata *cpu; |
| 1153 | |
Dirk Brandewie | c034871 | 2014-10-13 08:37:42 -0700 | [diff] [blame] | 1154 | if (!all_cpu_data[cpunum]) |
| 1155 | all_cpu_data[cpunum] = kzalloc(sizeof(struct cpudata), |
| 1156 | GFP_KERNEL); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1157 | if (!all_cpu_data[cpunum]) |
| 1158 | return -ENOMEM; |
| 1159 | |
| 1160 | cpu = all_cpu_data[cpunum]; |
| 1161 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1162 | cpu->cpu = cpunum; |
Kristen Carlson Accardi | ba88d43 | 2015-07-14 09:46:23 -0700 | [diff] [blame] | 1163 | |
| 1164 | if (hwp_active) |
| 1165 | intel_pstate_hwp_enable(cpu); |
| 1166 | |
Vincent Minet | 179e847 | 2014-07-05 01:51:33 +0200 | [diff] [blame] | 1167 | intel_pstate_get_cpu_pstates(cpu); |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 1168 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1169 | init_timer_deferrable(&cpu->timer); |
Stratos Karafotis | 2d8d1f1 | 2014-07-18 08:37:20 -0700 | [diff] [blame] | 1170 | cpu->timer.data = (unsigned long)cpu; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1171 | cpu->timer.expires = jiffies + HZ/100; |
Dirk Brandewie | 2f86dc4 | 2014-11-06 09:40:47 -0800 | [diff] [blame] | 1172 | |
| 1173 | if (!hwp_active) |
| 1174 | cpu->timer.function = intel_pstate_timer_func; |
| 1175 | else |
| 1176 | cpu->timer.function = intel_hwp_timer_func; |
| 1177 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1178 | intel_pstate_busy_pid_reset(cpu); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1179 | intel_pstate_sample(cpu); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1180 | |
| 1181 | add_timer_on(&cpu->timer, cpunum); |
| 1182 | |
Doug Smythies | f16255e | 2015-05-31 07:46:47 -0700 | [diff] [blame] | 1183 | pr_debug("intel_pstate: controlling: cpu %d\n", cpunum); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1184 | |
| 1185 | return 0; |
| 1186 | } |
| 1187 | |
| 1188 | static unsigned int intel_pstate_get(unsigned int cpu_num) |
| 1189 | { |
| 1190 | struct sample *sample; |
| 1191 | struct cpudata *cpu; |
| 1192 | |
| 1193 | cpu = all_cpu_data[cpu_num]; |
| 1194 | if (!cpu) |
| 1195 | return 0; |
Dirk Brandewie | d37e2b7 | 2014-02-12 10:01:04 -0800 | [diff] [blame] | 1196 | sample = &cpu->sample; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1197 | return sample->freq; |
| 1198 | } |
| 1199 | |
| 1200 | static int intel_pstate_set_policy(struct cpufreq_policy *policy) |
| 1201 | { |
Srinivas Pandruvada | 4ef4514 | 2015-10-14 16:12:03 -0700 | [diff] [blame^] | 1202 | #if IS_ENABLED(CONFIG_ACPI) |
| 1203 | struct cpudata *cpu; |
| 1204 | int i; |
| 1205 | #endif |
| 1206 | pr_debug("intel_pstate: %s max %u policy->max %u\n", __func__, |
| 1207 | policy->cpuinfo.max_freq, policy->max); |
Dirk Brandewie | d3929b8 | 2013-03-05 14:15:26 -0800 | [diff] [blame] | 1208 | if (!policy->cpuinfo.max_freq) |
| 1209 | return -ENODEV; |
| 1210 | |
Srinivas Pandruvada | 630ec28 | 2015-01-29 12:17:13 -0800 | [diff] [blame] | 1211 | if (policy->policy == CPUFREQ_POLICY_PERFORMANCE && |
| 1212 | policy->max >= policy->cpuinfo.max_freq) { |
Kristen Carlson Accardi | a047599 | 2015-01-29 13:03:52 -0800 | [diff] [blame] | 1213 | limits.min_policy_pct = 100; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1214 | limits.min_perf_pct = 100; |
| 1215 | limits.min_perf = int_tofp(1); |
Pali Rohár | 36b4bed | 2014-10-16 01:16:51 +0200 | [diff] [blame] | 1216 | limits.max_policy_pct = 100; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1217 | limits.max_perf_pct = 100; |
| 1218 | limits.max_perf = int_tofp(1); |
Gabriele Mazzotta | 4521e1a0 | 2014-10-13 08:37:41 -0700 | [diff] [blame] | 1219 | limits.no_turbo = 0; |
Srinivas Pandruvada | 4ef4514 | 2015-10-14 16:12:03 -0700 | [diff] [blame^] | 1220 | limits.max_perf_ctl = 0; |
| 1221 | limits.min_perf_ctl = 0; |
Srinivas Pandruvada | d1b6848 | 2013-04-09 22:38:18 +0000 | [diff] [blame] | 1222 | return 0; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1223 | } |
Dirk Brandewie | 2f86dc4 | 2014-11-06 09:40:47 -0800 | [diff] [blame] | 1224 | |
Kristen Carlson Accardi | a047599 | 2015-01-29 13:03:52 -0800 | [diff] [blame] | 1225 | limits.min_policy_pct = (policy->min * 100) / policy->cpuinfo.max_freq; |
| 1226 | limits.min_policy_pct = clamp_t(int, limits.min_policy_pct, 0 , 100); |
Stratos Karafotis | 285cb99 | 2014-07-18 08:37:21 -0700 | [diff] [blame] | 1227 | limits.max_policy_pct = (policy->max * 100) / policy->cpuinfo.max_freq; |
Dirk Brandewie | d8f469e | 2013-05-07 08:20:26 -0700 | [diff] [blame] | 1228 | limits.max_policy_pct = clamp_t(int, limits.max_policy_pct, 0 , 100); |
Chen Yu | 43717aa | 2015-09-09 18:27:31 +0800 | [diff] [blame] | 1229 | |
| 1230 | /* Normalize user input to [min_policy_pct, max_policy_pct] */ |
| 1231 | limits.min_perf_pct = max(limits.min_policy_pct, limits.min_sysfs_pct); |
| 1232 | limits.min_perf_pct = min(limits.max_policy_pct, limits.min_perf_pct); |
Dirk Brandewie | d8f469e | 2013-05-07 08:20:26 -0700 | [diff] [blame] | 1233 | limits.max_perf_pct = min(limits.max_policy_pct, limits.max_sysfs_pct); |
Chen Yu | 43717aa | 2015-09-09 18:27:31 +0800 | [diff] [blame] | 1234 | limits.max_perf_pct = max(limits.min_policy_pct, limits.max_perf_pct); |
| 1235 | |
| 1236 | /* Make sure min_perf_pct <= max_perf_pct */ |
| 1237 | limits.min_perf_pct = min(limits.max_perf_pct, limits.min_perf_pct); |
| 1238 | |
| 1239 | limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100)); |
Srinivas Pandruvada | d1b6848 | 2013-04-09 22:38:18 +0000 | [diff] [blame] | 1240 | limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100)); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1241 | |
Srinivas Pandruvada | 4ef4514 | 2015-10-14 16:12:03 -0700 | [diff] [blame^] | 1242 | #if IS_ENABLED(CONFIG_ACPI) |
| 1243 | cpu = all_cpu_data[policy->cpu]; |
| 1244 | for (i = 0; i < cpu->acpi_perf_data.state_count; i++) { |
| 1245 | int control; |
| 1246 | |
| 1247 | control = convert_to_native_pstate_format(cpu, i); |
| 1248 | if (control * cpu->pstate.scaling == policy->max) |
| 1249 | limits.max_perf_ctl = control; |
| 1250 | if (control * cpu->pstate.scaling == policy->min) |
| 1251 | limits.min_perf_ctl = control; |
| 1252 | } |
| 1253 | |
| 1254 | pr_debug("intel_pstate: max %u policy_max %u perf_ctl [0x%x-0x%x]\n", |
| 1255 | policy->cpuinfo.max_freq, policy->max, limits.min_perf_ctl, |
| 1256 | limits.max_perf_ctl); |
| 1257 | #endif |
| 1258 | |
Dirk Brandewie | 2f86dc4 | 2014-11-06 09:40:47 -0800 | [diff] [blame] | 1259 | if (hwp_active) |
| 1260 | intel_pstate_hwp_set(); |
| 1261 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1262 | return 0; |
| 1263 | } |
| 1264 | |
| 1265 | static int intel_pstate_verify_policy(struct cpufreq_policy *policy) |
| 1266 | { |
Viresh Kumar | be49e34 | 2013-10-02 14:13:19 +0530 | [diff] [blame] | 1267 | cpufreq_verify_within_cpu_limits(policy); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1268 | |
Stratos Karafotis | 285cb99 | 2014-07-18 08:37:21 -0700 | [diff] [blame] | 1269 | if (policy->policy != CPUFREQ_POLICY_POWERSAVE && |
Stratos Karafotis | c410833 | 2014-07-18 08:37:23 -0700 | [diff] [blame] | 1270 | policy->policy != CPUFREQ_POLICY_PERFORMANCE) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1271 | return -EINVAL; |
| 1272 | |
| 1273 | return 0; |
| 1274 | } |
| 1275 | |
Dirk Brandewie | bb18008 | 2014-03-19 08:45:54 -0700 | [diff] [blame] | 1276 | static void intel_pstate_stop_cpu(struct cpufreq_policy *policy) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1277 | { |
Dirk Brandewie | bb18008 | 2014-03-19 08:45:54 -0700 | [diff] [blame] | 1278 | int cpu_num = policy->cpu; |
| 1279 | struct cpudata *cpu = all_cpu_data[cpu_num]; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1280 | |
Doug Smythies | f16255e | 2015-05-31 07:46:47 -0700 | [diff] [blame] | 1281 | pr_debug("intel_pstate: CPU %d exiting\n", cpu_num); |
Dirk Brandewie | bb18008 | 2014-03-19 08:45:54 -0700 | [diff] [blame] | 1282 | |
Dirk Brandewie | c2294a2 | 2014-03-24 07:41:29 -0700 | [diff] [blame] | 1283 | del_timer_sync(&all_cpu_data[cpu_num]->timer); |
Dirk Brandewie | 2f86dc4 | 2014-11-06 09:40:47 -0800 | [diff] [blame] | 1284 | if (hwp_active) |
| 1285 | return; |
| 1286 | |
Doug Smythies | 6c1e459 | 2015-06-01 21:12:34 -0700 | [diff] [blame] | 1287 | intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate, false); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1288 | } |
| 1289 | |
Paul Gortmaker | 2760984 | 2013-06-19 13:54:04 -0400 | [diff] [blame] | 1290 | static int intel_pstate_cpu_init(struct cpufreq_policy *policy) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1291 | { |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1292 | struct cpudata *cpu; |
Dirk Brandewie | 52e0a50 | 2013-10-15 11:06:14 -0700 | [diff] [blame] | 1293 | int rc; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1294 | |
| 1295 | rc = intel_pstate_init_cpu(policy->cpu); |
| 1296 | if (rc) |
| 1297 | return rc; |
| 1298 | |
| 1299 | cpu = all_cpu_data[policy->cpu]; |
| 1300 | |
Dirk Brandewie | dd5fbf7 | 2014-06-20 07:27:59 -0700 | [diff] [blame] | 1301 | if (limits.min_perf_pct == 100 && limits.max_perf_pct == 100) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1302 | policy->policy = CPUFREQ_POLICY_PERFORMANCE; |
| 1303 | else |
| 1304 | policy->policy = CPUFREQ_POLICY_POWERSAVE; |
| 1305 | |
Dirk Brandewie | b27580b | 2014-10-13 08:37:43 -0700 | [diff] [blame] | 1306 | policy->min = cpu->pstate.min_pstate * cpu->pstate.scaling; |
| 1307 | policy->max = cpu->pstate.turbo_pstate * cpu->pstate.scaling; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1308 | |
| 1309 | /* cpuinfo and default policy values */ |
Dirk Brandewie | b27580b | 2014-10-13 08:37:43 -0700 | [diff] [blame] | 1310 | policy->cpuinfo.min_freq = cpu->pstate.min_pstate * cpu->pstate.scaling; |
| 1311 | policy->cpuinfo.max_freq = |
| 1312 | cpu->pstate.turbo_pstate * cpu->pstate.scaling; |
Srinivas Pandruvada | 37afb00 | 2015-10-14 16:12:01 -0700 | [diff] [blame] | 1313 | if (!no_acpi_perf) |
| 1314 | intel_pstate_init_perf_limits(policy); |
| 1315 | /* |
| 1316 | * If there is no acpi perf data or error, we ignore and use Intel P |
| 1317 | * state calculated limits, So this is not fatal error. |
| 1318 | */ |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1319 | policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL; |
| 1320 | cpumask_set_cpu(policy->cpu, policy->cpus); |
| 1321 | |
| 1322 | return 0; |
| 1323 | } |
| 1324 | |
Srinivas Pandruvada | 37afb00 | 2015-10-14 16:12:01 -0700 | [diff] [blame] | 1325 | static int intel_pstate_cpu_exit(struct cpufreq_policy *policy) |
| 1326 | { |
| 1327 | return intel_pstate_exit_perf_limits(policy); |
| 1328 | } |
| 1329 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1330 | static struct cpufreq_driver intel_pstate_driver = { |
| 1331 | .flags = CPUFREQ_CONST_LOOPS, |
| 1332 | .verify = intel_pstate_verify_policy, |
| 1333 | .setpolicy = intel_pstate_set_policy, |
| 1334 | .get = intel_pstate_get, |
| 1335 | .init = intel_pstate_cpu_init, |
Srinivas Pandruvada | 37afb00 | 2015-10-14 16:12:01 -0700 | [diff] [blame] | 1336 | .exit = intel_pstate_cpu_exit, |
Dirk Brandewie | bb18008 | 2014-03-19 08:45:54 -0700 | [diff] [blame] | 1337 | .stop_cpu = intel_pstate_stop_cpu, |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1338 | .name = "intel_pstate", |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1339 | }; |
| 1340 | |
Dirk Brandewie | 6be2649 | 2013-02-15 22:55:10 +0100 | [diff] [blame] | 1341 | static int __initdata no_load; |
Dirk Brandewie | 2f86dc4 | 2014-11-06 09:40:47 -0800 | [diff] [blame] | 1342 | static int __initdata no_hwp; |
Kristen Carlson Accardi | d64c3b0 | 2015-02-06 13:41:55 -0800 | [diff] [blame] | 1343 | static int __initdata hwp_only; |
Ethan Zhao | aa4ea34 | 2014-12-09 10:43:19 +0900 | [diff] [blame] | 1344 | static unsigned int force_load; |
Dirk Brandewie | 6be2649 | 2013-02-15 22:55:10 +0100 | [diff] [blame] | 1345 | |
Dirk Brandewie | b563b4e | 2013-03-22 01:29:28 +0100 | [diff] [blame] | 1346 | static int intel_pstate_msrs_not_valid(void) |
| 1347 | { |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 1348 | if (!pstate_funcs.get_max() || |
Stratos Karafotis | c410833 | 2014-07-18 08:37:23 -0700 | [diff] [blame] | 1349 | !pstate_funcs.get_min() || |
| 1350 | !pstate_funcs.get_turbo()) |
Dirk Brandewie | b563b4e | 2013-03-22 01:29:28 +0100 | [diff] [blame] | 1351 | return -ENODEV; |
| 1352 | |
Dirk Brandewie | b563b4e | 2013-03-22 01:29:28 +0100 | [diff] [blame] | 1353 | return 0; |
| 1354 | } |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 1355 | |
Dirk Brandewie | e0a261a | 2013-10-30 08:38:32 -0700 | [diff] [blame] | 1356 | static void copy_pid_params(struct pstate_adjust_policy *policy) |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 1357 | { |
| 1358 | pid_params.sample_rate_ms = policy->sample_rate_ms; |
| 1359 | pid_params.p_gain_pct = policy->p_gain_pct; |
| 1360 | pid_params.i_gain_pct = policy->i_gain_pct; |
| 1361 | pid_params.d_gain_pct = policy->d_gain_pct; |
| 1362 | pid_params.deadband = policy->deadband; |
| 1363 | pid_params.setpoint = policy->setpoint; |
| 1364 | } |
| 1365 | |
Dirk Brandewie | e0a261a | 2013-10-30 08:38:32 -0700 | [diff] [blame] | 1366 | static void copy_cpu_funcs(struct pstate_funcs *funcs) |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 1367 | { |
| 1368 | pstate_funcs.get_max = funcs->get_max; |
Srinivas Pandruvada | 3bcc6fa | 2015-10-14 16:12:00 -0700 | [diff] [blame] | 1369 | pstate_funcs.get_max_physical = funcs->get_max_physical; |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 1370 | pstate_funcs.get_min = funcs->get_min; |
| 1371 | pstate_funcs.get_turbo = funcs->get_turbo; |
Dirk Brandewie | b27580b | 2014-10-13 08:37:43 -0700 | [diff] [blame] | 1372 | pstate_funcs.get_scaling = funcs->get_scaling; |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 1373 | pstate_funcs.set = funcs->set; |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 1374 | pstate_funcs.get_vid = funcs->get_vid; |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 1375 | } |
| 1376 | |
Adrian Huang | fbbcdc0 | 2013-10-31 23:24:05 +0800 | [diff] [blame] | 1377 | #if IS_ENABLED(CONFIG_ACPI) |
Adrian Huang | fbbcdc0 | 2013-10-31 23:24:05 +0800 | [diff] [blame] | 1378 | |
| 1379 | static bool intel_pstate_no_acpi_pss(void) |
| 1380 | { |
| 1381 | int i; |
| 1382 | |
| 1383 | for_each_possible_cpu(i) { |
| 1384 | acpi_status status; |
| 1385 | union acpi_object *pss; |
| 1386 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 1387 | struct acpi_processor *pr = per_cpu(processors, i); |
| 1388 | |
| 1389 | if (!pr) |
| 1390 | continue; |
| 1391 | |
| 1392 | status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); |
| 1393 | if (ACPI_FAILURE(status)) |
| 1394 | continue; |
| 1395 | |
| 1396 | pss = buffer.pointer; |
| 1397 | if (pss && pss->type == ACPI_TYPE_PACKAGE) { |
| 1398 | kfree(pss); |
| 1399 | return false; |
| 1400 | } |
| 1401 | |
| 1402 | kfree(pss); |
| 1403 | } |
| 1404 | |
| 1405 | return true; |
| 1406 | } |
| 1407 | |
ethan zhao | 966916e | 2014-12-01 11:32:08 +0900 | [diff] [blame] | 1408 | static bool intel_pstate_has_acpi_ppc(void) |
| 1409 | { |
| 1410 | int i; |
| 1411 | |
| 1412 | for_each_possible_cpu(i) { |
| 1413 | struct acpi_processor *pr = per_cpu(processors, i); |
| 1414 | |
| 1415 | if (!pr) |
| 1416 | continue; |
| 1417 | if (acpi_has_method(pr->handle, "_PPC")) |
| 1418 | return true; |
| 1419 | } |
| 1420 | return false; |
| 1421 | } |
| 1422 | |
| 1423 | enum { |
| 1424 | PSS, |
| 1425 | PPC, |
| 1426 | }; |
| 1427 | |
Adrian Huang | fbbcdc0 | 2013-10-31 23:24:05 +0800 | [diff] [blame] | 1428 | struct hw_vendor_info { |
| 1429 | u16 valid; |
| 1430 | char oem_id[ACPI_OEM_ID_SIZE]; |
| 1431 | char oem_table_id[ACPI_OEM_TABLE_ID_SIZE]; |
ethan zhao | 966916e | 2014-12-01 11:32:08 +0900 | [diff] [blame] | 1432 | int oem_pwr_table; |
Adrian Huang | fbbcdc0 | 2013-10-31 23:24:05 +0800 | [diff] [blame] | 1433 | }; |
| 1434 | |
| 1435 | /* Hardware vendor-specific info that has its own power management modes */ |
| 1436 | static struct hw_vendor_info vendor_info[] = { |
ethan zhao | 966916e | 2014-12-01 11:32:08 +0900 | [diff] [blame] | 1437 | {1, "HP ", "ProLiant", PSS}, |
| 1438 | {1, "ORACLE", "X4-2 ", PPC}, |
| 1439 | {1, "ORACLE", "X4-2L ", PPC}, |
| 1440 | {1, "ORACLE", "X4-2B ", PPC}, |
| 1441 | {1, "ORACLE", "X3-2 ", PPC}, |
| 1442 | {1, "ORACLE", "X3-2L ", PPC}, |
| 1443 | {1, "ORACLE", "X3-2B ", PPC}, |
| 1444 | {1, "ORACLE", "X4470M2 ", PPC}, |
| 1445 | {1, "ORACLE", "X4270M3 ", PPC}, |
| 1446 | {1, "ORACLE", "X4270M2 ", PPC}, |
| 1447 | {1, "ORACLE", "X4170M2 ", PPC}, |
Ethan Zhao | 5aecc3c | 2015-08-05 09:28:50 +0900 | [diff] [blame] | 1448 | {1, "ORACLE", "X4170 M3", PPC}, |
| 1449 | {1, "ORACLE", "X4275 M3", PPC}, |
| 1450 | {1, "ORACLE", "X6-2 ", PPC}, |
| 1451 | {1, "ORACLE", "Sudbury ", PPC}, |
Adrian Huang | fbbcdc0 | 2013-10-31 23:24:05 +0800 | [diff] [blame] | 1452 | {0, "", ""}, |
| 1453 | }; |
| 1454 | |
| 1455 | static bool intel_pstate_platform_pwr_mgmt_exists(void) |
| 1456 | { |
| 1457 | struct acpi_table_header hdr; |
| 1458 | struct hw_vendor_info *v_info; |
Dirk Brandewie | 2f86dc4 | 2014-11-06 09:40:47 -0800 | [diff] [blame] | 1459 | const struct x86_cpu_id *id; |
| 1460 | u64 misc_pwr; |
| 1461 | |
| 1462 | id = x86_match_cpu(intel_pstate_cpu_oob_ids); |
| 1463 | if (id) { |
| 1464 | rdmsrl(MSR_MISC_PWR_MGMT, misc_pwr); |
| 1465 | if ( misc_pwr & (1 << 8)) |
| 1466 | return true; |
| 1467 | } |
Adrian Huang | fbbcdc0 | 2013-10-31 23:24:05 +0800 | [diff] [blame] | 1468 | |
Stratos Karafotis | c410833 | 2014-07-18 08:37:23 -0700 | [diff] [blame] | 1469 | if (acpi_disabled || |
| 1470 | ACPI_FAILURE(acpi_get_table_header(ACPI_SIG_FADT, 0, &hdr))) |
Adrian Huang | fbbcdc0 | 2013-10-31 23:24:05 +0800 | [diff] [blame] | 1471 | return false; |
| 1472 | |
| 1473 | for (v_info = vendor_info; v_info->valid; v_info++) { |
Stratos Karafotis | c410833 | 2014-07-18 08:37:23 -0700 | [diff] [blame] | 1474 | if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE) && |
ethan zhao | 966916e | 2014-12-01 11:32:08 +0900 | [diff] [blame] | 1475 | !strncmp(hdr.oem_table_id, v_info->oem_table_id, |
| 1476 | ACPI_OEM_TABLE_ID_SIZE)) |
| 1477 | switch (v_info->oem_pwr_table) { |
| 1478 | case PSS: |
| 1479 | return intel_pstate_no_acpi_pss(); |
| 1480 | case PPC: |
Ethan Zhao | aa4ea34 | 2014-12-09 10:43:19 +0900 | [diff] [blame] | 1481 | return intel_pstate_has_acpi_ppc() && |
| 1482 | (!force_load); |
ethan zhao | 966916e | 2014-12-01 11:32:08 +0900 | [diff] [blame] | 1483 | } |
Adrian Huang | fbbcdc0 | 2013-10-31 23:24:05 +0800 | [diff] [blame] | 1484 | } |
| 1485 | |
| 1486 | return false; |
| 1487 | } |
| 1488 | #else /* CONFIG_ACPI not enabled */ |
| 1489 | static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; } |
ethan zhao | 966916e | 2014-12-01 11:32:08 +0900 | [diff] [blame] | 1490 | static inline bool intel_pstate_has_acpi_ppc(void) { return false; } |
Adrian Huang | fbbcdc0 | 2013-10-31 23:24:05 +0800 | [diff] [blame] | 1491 | #endif /* CONFIG_ACPI */ |
| 1492 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1493 | static int __init intel_pstate_init(void) |
| 1494 | { |
Dirk Brandewie | 907cc90 | 2013-03-05 14:15:27 -0800 | [diff] [blame] | 1495 | int cpu, rc = 0; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1496 | const struct x86_cpu_id *id; |
Borislav Petkov | 64df1fd | 2015-04-03 15:19:53 +0200 | [diff] [blame] | 1497 | struct cpu_defaults *cpu_def; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1498 | |
Dirk Brandewie | 6be2649 | 2013-02-15 22:55:10 +0100 | [diff] [blame] | 1499 | if (no_load) |
| 1500 | return -ENODEV; |
| 1501 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1502 | id = x86_match_cpu(intel_pstate_cpu_ids); |
| 1503 | if (!id) |
| 1504 | return -ENODEV; |
| 1505 | |
Adrian Huang | fbbcdc0 | 2013-10-31 23:24:05 +0800 | [diff] [blame] | 1506 | /* |
| 1507 | * The Intel pstate driver will be ignored if the platform |
| 1508 | * firmware has its own power management modes. |
| 1509 | */ |
| 1510 | if (intel_pstate_platform_pwr_mgmt_exists()) |
| 1511 | return -ENODEV; |
| 1512 | |
Borislav Petkov | 64df1fd | 2015-04-03 15:19:53 +0200 | [diff] [blame] | 1513 | cpu_def = (struct cpu_defaults *)id->driver_data; |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 1514 | |
Borislav Petkov | 64df1fd | 2015-04-03 15:19:53 +0200 | [diff] [blame] | 1515 | copy_pid_params(&cpu_def->pid_policy); |
| 1516 | copy_cpu_funcs(&cpu_def->funcs); |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 1517 | |
Dirk Brandewie | b563b4e | 2013-03-22 01:29:28 +0100 | [diff] [blame] | 1518 | if (intel_pstate_msrs_not_valid()) |
| 1519 | return -ENODEV; |
| 1520 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1521 | pr_info("Intel P-state driver initializing.\n"); |
| 1522 | |
Wei Yongjun | b57ffac | 2013-05-13 08:03:43 +0000 | [diff] [blame] | 1523 | all_cpu_data = vzalloc(sizeof(void *) * num_possible_cpus()); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1524 | if (!all_cpu_data) |
| 1525 | return -ENOMEM; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1526 | |
Borislav Petkov | 64df1fd | 2015-04-03 15:19:53 +0200 | [diff] [blame] | 1527 | if (static_cpu_has_safe(X86_FEATURE_HWP) && !no_hwp) |
Kristen Carlson Accardi | ba88d43 | 2015-07-14 09:46:23 -0700 | [diff] [blame] | 1528 | hwp_active++; |
Dirk Brandewie | 2f86dc4 | 2014-11-06 09:40:47 -0800 | [diff] [blame] | 1529 | |
Kristen Carlson Accardi | d64c3b0 | 2015-02-06 13:41:55 -0800 | [diff] [blame] | 1530 | if (!hwp_active && hwp_only) |
| 1531 | goto out; |
| 1532 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1533 | rc = cpufreq_register_driver(&intel_pstate_driver); |
| 1534 | if (rc) |
| 1535 | goto out; |
| 1536 | |
| 1537 | intel_pstate_debug_expose_params(); |
| 1538 | intel_pstate_sysfs_expose_params(); |
Dirk Brandewie | b69880f | 2014-01-16 10:32:25 -0800 | [diff] [blame] | 1539 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1540 | return rc; |
| 1541 | out: |
Dirk Brandewie | 907cc90 | 2013-03-05 14:15:27 -0800 | [diff] [blame] | 1542 | get_online_cpus(); |
| 1543 | for_each_online_cpu(cpu) { |
| 1544 | if (all_cpu_data[cpu]) { |
| 1545 | del_timer_sync(&all_cpu_data[cpu]->timer); |
| 1546 | kfree(all_cpu_data[cpu]); |
| 1547 | } |
| 1548 | } |
| 1549 | |
| 1550 | put_online_cpus(); |
| 1551 | vfree(all_cpu_data); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1552 | return -ENODEV; |
| 1553 | } |
| 1554 | device_initcall(intel_pstate_init); |
| 1555 | |
Dirk Brandewie | 6be2649 | 2013-02-15 22:55:10 +0100 | [diff] [blame] | 1556 | static int __init intel_pstate_setup(char *str) |
| 1557 | { |
| 1558 | if (!str) |
| 1559 | return -EINVAL; |
| 1560 | |
| 1561 | if (!strcmp(str, "disable")) |
| 1562 | no_load = 1; |
Dirk Brandewie | 2f86dc4 | 2014-11-06 09:40:47 -0800 | [diff] [blame] | 1563 | if (!strcmp(str, "no_hwp")) |
| 1564 | no_hwp = 1; |
Ethan Zhao | aa4ea34 | 2014-12-09 10:43:19 +0900 | [diff] [blame] | 1565 | if (!strcmp(str, "force")) |
| 1566 | force_load = 1; |
Kristen Carlson Accardi | d64c3b0 | 2015-02-06 13:41:55 -0800 | [diff] [blame] | 1567 | if (!strcmp(str, "hwp_only")) |
| 1568 | hwp_only = 1; |
Srinivas Pandruvada | 37afb00 | 2015-10-14 16:12:01 -0700 | [diff] [blame] | 1569 | if (!strcmp(str, "no_acpi")) |
| 1570 | no_acpi_perf = 1; |
| 1571 | |
Dirk Brandewie | 6be2649 | 2013-02-15 22:55:10 +0100 | [diff] [blame] | 1572 | return 0; |
| 1573 | } |
| 1574 | early_param("intel_pstate", intel_pstate_setup); |
| 1575 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1576 | MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@intel.com>"); |
| 1577 | MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors"); |
| 1578 | MODULE_LICENSE("GPL"); |