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> |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 29 | #include <trace/events/power.h> |
| 30 | |
| 31 | #include <asm/div64.h> |
| 32 | #include <asm/msr.h> |
| 33 | #include <asm/cpu_device_id.h> |
| 34 | |
Dirk Brandewie | 61d8d2a | 2014-02-12 10:01:07 -0800 | [diff] [blame] | 35 | #define BYT_RATIOS 0x66a |
| 36 | #define BYT_VIDS 0x66b |
| 37 | #define BYT_TURBO_RATIOS 0x66c |
Dirk Brandewie | 21855ff | 2014-05-08 12:57:23 -0700 | [diff] [blame] | 38 | #define BYT_TURBO_VIDS 0x66d |
Dirk Brandewie | 61d8d2a | 2014-02-12 10:01:07 -0800 | [diff] [blame] | 39 | |
Dirk Brandewie | 19e77c2 | 2013-10-21 09:20:35 -0700 | [diff] [blame] | 40 | |
Dirk Brandewie | f0fe3cd | 2014-05-29 09:32:23 -0700 | [diff] [blame] | 41 | #define FRAC_BITS 8 |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 42 | #define int_tofp(X) ((int64_t)(X) << FRAC_BITS) |
| 43 | #define fp_toint(X) ((X) >> FRAC_BITS) |
Dirk Brandewie | f0fe3cd | 2014-05-29 09:32:23 -0700 | [diff] [blame] | 44 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 45 | |
| 46 | static inline int32_t mul_fp(int32_t x, int32_t y) |
| 47 | { |
| 48 | return ((int64_t)x * (int64_t)y) >> FRAC_BITS; |
| 49 | } |
| 50 | |
| 51 | static inline int32_t div_fp(int32_t x, int32_t y) |
| 52 | { |
| 53 | return div_s64((int64_t)x << FRAC_BITS, (int64_t)y); |
| 54 | } |
| 55 | |
| 56 | struct sample { |
Brennan Shacklett | d253d2a | 2013-10-21 09:20:32 -0700 | [diff] [blame] | 57 | int32_t core_pct_busy; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 58 | u64 aperf; |
| 59 | u64 mperf; |
| 60 | int freq; |
Dirk Brandewie | c4ee841 | 2014-05-29 09:32:24 -0700 | [diff] [blame] | 61 | ktime_t time; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 62 | }; |
| 63 | |
| 64 | struct pstate_data { |
| 65 | int current_pstate; |
| 66 | int min_pstate; |
| 67 | int max_pstate; |
| 68 | int turbo_pstate; |
| 69 | }; |
| 70 | |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 71 | struct vid_data { |
Dirk Brandewie | 21855ff | 2014-05-08 12:57:23 -0700 | [diff] [blame] | 72 | int min; |
| 73 | int max; |
| 74 | int turbo; |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 75 | int32_t ratio; |
| 76 | }; |
| 77 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 78 | struct _pid { |
| 79 | int setpoint; |
| 80 | int32_t integral; |
| 81 | int32_t p_gain; |
| 82 | int32_t i_gain; |
| 83 | int32_t d_gain; |
| 84 | int deadband; |
Brennan Shacklett | d253d2a | 2013-10-21 09:20:32 -0700 | [diff] [blame] | 85 | int32_t last_err; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 86 | }; |
| 87 | |
| 88 | struct cpudata { |
| 89 | int cpu; |
| 90 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 91 | struct timer_list timer; |
| 92 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 93 | struct pstate_data pstate; |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 94 | struct vid_data vid; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 95 | struct _pid pid; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 96 | |
Dirk Brandewie | c4ee841 | 2014-05-29 09:32:24 -0700 | [diff] [blame] | 97 | ktime_t last_sample_time; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 98 | u64 prev_aperf; |
| 99 | u64 prev_mperf; |
Dirk Brandewie | d37e2b7 | 2014-02-12 10:01:04 -0800 | [diff] [blame] | 100 | struct sample sample; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 101 | }; |
| 102 | |
| 103 | static struct cpudata **all_cpu_data; |
| 104 | struct pstate_adjust_policy { |
| 105 | int sample_rate_ms; |
| 106 | int deadband; |
| 107 | int setpoint; |
| 108 | int p_gain_pct; |
| 109 | int d_gain_pct; |
| 110 | int i_gain_pct; |
| 111 | }; |
| 112 | |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 113 | struct pstate_funcs { |
| 114 | int (*get_max)(void); |
| 115 | int (*get_min)(void); |
| 116 | int (*get_turbo)(void); |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 117 | void (*set)(struct cpudata*, int pstate); |
| 118 | void (*get_vid)(struct cpudata *); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 119 | }; |
| 120 | |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 121 | struct cpu_defaults { |
| 122 | struct pstate_adjust_policy pid_policy; |
| 123 | struct pstate_funcs funcs; |
| 124 | }; |
| 125 | |
| 126 | static struct pstate_adjust_policy pid_params; |
| 127 | static struct pstate_funcs pstate_funcs; |
| 128 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 129 | struct perf_limits { |
| 130 | int no_turbo; |
| 131 | int max_perf_pct; |
| 132 | int min_perf_pct; |
| 133 | int32_t max_perf; |
| 134 | int32_t min_perf; |
Dirk Brandewie | d8f469e | 2013-05-07 08:20:26 -0700 | [diff] [blame] | 135 | int max_policy_pct; |
| 136 | int max_sysfs_pct; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 137 | }; |
| 138 | |
| 139 | static struct perf_limits limits = { |
| 140 | .no_turbo = 0, |
| 141 | .max_perf_pct = 100, |
| 142 | .max_perf = int_tofp(1), |
| 143 | .min_perf_pct = 0, |
| 144 | .min_perf = 0, |
Dirk Brandewie | d8f469e | 2013-05-07 08:20:26 -0700 | [diff] [blame] | 145 | .max_policy_pct = 100, |
| 146 | .max_sysfs_pct = 100, |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 147 | }; |
| 148 | |
| 149 | static inline void pid_reset(struct _pid *pid, int setpoint, int busy, |
| 150 | int deadband, int integral) { |
| 151 | pid->setpoint = setpoint; |
| 152 | pid->deadband = deadband; |
| 153 | pid->integral = int_tofp(integral); |
Dirk Brandewie | d98d099 | 2014-02-12 10:01:05 -0800 | [diff] [blame] | 154 | pid->last_err = int_tofp(setpoint) - int_tofp(busy); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 155 | } |
| 156 | |
| 157 | static inline void pid_p_gain_set(struct _pid *pid, int percent) |
| 158 | { |
| 159 | pid->p_gain = div_fp(int_tofp(percent), int_tofp(100)); |
| 160 | } |
| 161 | |
| 162 | static inline void pid_i_gain_set(struct _pid *pid, int percent) |
| 163 | { |
| 164 | pid->i_gain = div_fp(int_tofp(percent), int_tofp(100)); |
| 165 | } |
| 166 | |
| 167 | static inline void pid_d_gain_set(struct _pid *pid, int percent) |
| 168 | { |
| 169 | |
| 170 | pid->d_gain = div_fp(int_tofp(percent), int_tofp(100)); |
| 171 | } |
| 172 | |
Brennan Shacklett | d253d2a | 2013-10-21 09:20:32 -0700 | [diff] [blame] | 173 | static signed int pid_calc(struct _pid *pid, int32_t busy) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 174 | { |
Brennan Shacklett | d253d2a | 2013-10-21 09:20:32 -0700 | [diff] [blame] | 175 | signed int result; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 176 | int32_t pterm, dterm, fp_error; |
| 177 | int32_t integral_limit; |
| 178 | |
Brennan Shacklett | d253d2a | 2013-10-21 09:20:32 -0700 | [diff] [blame] | 179 | fp_error = int_tofp(pid->setpoint) - busy; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 180 | |
Brennan Shacklett | d253d2a | 2013-10-21 09:20:32 -0700 | [diff] [blame] | 181 | if (abs(fp_error) <= int_tofp(pid->deadband)) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 182 | return 0; |
| 183 | |
| 184 | pterm = mul_fp(pid->p_gain, fp_error); |
| 185 | |
| 186 | pid->integral += fp_error; |
| 187 | |
| 188 | /* limit the integral term */ |
| 189 | integral_limit = int_tofp(30); |
| 190 | if (pid->integral > integral_limit) |
| 191 | pid->integral = integral_limit; |
| 192 | if (pid->integral < -integral_limit) |
| 193 | pid->integral = -integral_limit; |
| 194 | |
Brennan Shacklett | d253d2a | 2013-10-21 09:20:32 -0700 | [diff] [blame] | 195 | dterm = mul_fp(pid->d_gain, fp_error - pid->last_err); |
| 196 | pid->last_err = fp_error; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 197 | |
| 198 | result = pterm + mul_fp(pid->integral, pid->i_gain) + dterm; |
Dirk Brandewie | f0fe3cd | 2014-05-29 09:32:23 -0700 | [diff] [blame] | 199 | if (result >= 0) |
| 200 | result = result + (1 << (FRAC_BITS-1)); |
| 201 | else |
| 202 | result = result - (1 << (FRAC_BITS-1)); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 203 | return (signed int)fp_toint(result); |
| 204 | } |
| 205 | |
| 206 | static inline void intel_pstate_busy_pid_reset(struct cpudata *cpu) |
| 207 | { |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 208 | pid_p_gain_set(&cpu->pid, pid_params.p_gain_pct); |
| 209 | pid_d_gain_set(&cpu->pid, pid_params.d_gain_pct); |
| 210 | pid_i_gain_set(&cpu->pid, pid_params.i_gain_pct); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 211 | |
| 212 | pid_reset(&cpu->pid, |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 213 | pid_params.setpoint, |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 214 | 100, |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 215 | pid_params.deadband, |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 216 | 0); |
| 217 | } |
| 218 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 219 | static inline void intel_pstate_reset_all_pid(void) |
| 220 | { |
| 221 | unsigned int cpu; |
| 222 | for_each_online_cpu(cpu) { |
| 223 | if (all_cpu_data[cpu]) |
| 224 | intel_pstate_busy_pid_reset(all_cpu_data[cpu]); |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | /************************** debugfs begin ************************/ |
| 229 | static int pid_param_set(void *data, u64 val) |
| 230 | { |
| 231 | *(u32 *)data = val; |
| 232 | intel_pstate_reset_all_pid(); |
| 233 | return 0; |
| 234 | } |
| 235 | static int pid_param_get(void *data, u64 *val) |
| 236 | { |
| 237 | *val = *(u32 *)data; |
| 238 | return 0; |
| 239 | } |
| 240 | DEFINE_SIMPLE_ATTRIBUTE(fops_pid_param, pid_param_get, |
| 241 | pid_param_set, "%llu\n"); |
| 242 | |
| 243 | struct pid_param { |
| 244 | char *name; |
| 245 | void *value; |
| 246 | }; |
| 247 | |
| 248 | static struct pid_param pid_files[] = { |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 249 | {"sample_rate_ms", &pid_params.sample_rate_ms}, |
| 250 | {"d_gain_pct", &pid_params.d_gain_pct}, |
| 251 | {"i_gain_pct", &pid_params.i_gain_pct}, |
| 252 | {"deadband", &pid_params.deadband}, |
| 253 | {"setpoint", &pid_params.setpoint}, |
| 254 | {"p_gain_pct", &pid_params.p_gain_pct}, |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 255 | {NULL, NULL} |
| 256 | }; |
| 257 | |
| 258 | static struct dentry *debugfs_parent; |
| 259 | static void intel_pstate_debug_expose_params(void) |
| 260 | { |
| 261 | int i = 0; |
| 262 | |
| 263 | debugfs_parent = debugfs_create_dir("pstate_snb", NULL); |
| 264 | if (IS_ERR_OR_NULL(debugfs_parent)) |
| 265 | return; |
| 266 | while (pid_files[i].name) { |
| 267 | debugfs_create_file(pid_files[i].name, 0660, |
| 268 | debugfs_parent, pid_files[i].value, |
| 269 | &fops_pid_param); |
| 270 | i++; |
| 271 | } |
| 272 | } |
| 273 | |
| 274 | /************************** debugfs end ************************/ |
| 275 | |
| 276 | /************************** sysfs begin ************************/ |
| 277 | #define show_one(file_name, object) \ |
| 278 | static ssize_t show_##file_name \ |
| 279 | (struct kobject *kobj, struct attribute *attr, char *buf) \ |
| 280 | { \ |
| 281 | return sprintf(buf, "%u\n", limits.object); \ |
| 282 | } |
| 283 | |
| 284 | static ssize_t store_no_turbo(struct kobject *a, struct attribute *b, |
| 285 | const char *buf, size_t count) |
| 286 | { |
| 287 | unsigned int input; |
| 288 | int ret; |
| 289 | ret = sscanf(buf, "%u", &input); |
| 290 | if (ret != 1) |
| 291 | return -EINVAL; |
| 292 | limits.no_turbo = clamp_t(int, input, 0 , 1); |
| 293 | |
| 294 | return count; |
| 295 | } |
| 296 | |
| 297 | static ssize_t store_max_perf_pct(struct kobject *a, struct attribute *b, |
| 298 | const char *buf, size_t count) |
| 299 | { |
| 300 | unsigned int input; |
| 301 | int ret; |
| 302 | ret = sscanf(buf, "%u", &input); |
| 303 | if (ret != 1) |
| 304 | return -EINVAL; |
| 305 | |
Dirk Brandewie | d8f469e | 2013-05-07 08:20:26 -0700 | [diff] [blame] | 306 | limits.max_sysfs_pct = clamp_t(int, input, 0 , 100); |
| 307 | limits.max_perf_pct = min(limits.max_policy_pct, limits.max_sysfs_pct); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 308 | limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100)); |
| 309 | return count; |
| 310 | } |
| 311 | |
| 312 | static ssize_t store_min_perf_pct(struct kobject *a, struct attribute *b, |
| 313 | const char *buf, size_t count) |
| 314 | { |
| 315 | unsigned int input; |
| 316 | int ret; |
| 317 | ret = sscanf(buf, "%u", &input); |
| 318 | if (ret != 1) |
| 319 | return -EINVAL; |
| 320 | limits.min_perf_pct = clamp_t(int, input, 0 , 100); |
| 321 | limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100)); |
| 322 | |
| 323 | return count; |
| 324 | } |
| 325 | |
| 326 | show_one(no_turbo, no_turbo); |
| 327 | show_one(max_perf_pct, max_perf_pct); |
| 328 | show_one(min_perf_pct, min_perf_pct); |
| 329 | |
| 330 | define_one_global_rw(no_turbo); |
| 331 | define_one_global_rw(max_perf_pct); |
| 332 | define_one_global_rw(min_perf_pct); |
| 333 | |
| 334 | static struct attribute *intel_pstate_attributes[] = { |
| 335 | &no_turbo.attr, |
| 336 | &max_perf_pct.attr, |
| 337 | &min_perf_pct.attr, |
| 338 | NULL |
| 339 | }; |
| 340 | |
| 341 | static struct attribute_group intel_pstate_attr_group = { |
| 342 | .attrs = intel_pstate_attributes, |
| 343 | }; |
| 344 | static struct kobject *intel_pstate_kobject; |
| 345 | |
| 346 | static void intel_pstate_sysfs_expose_params(void) |
| 347 | { |
| 348 | int rc; |
| 349 | |
| 350 | intel_pstate_kobject = kobject_create_and_add("intel_pstate", |
| 351 | &cpu_subsys.dev_root->kobj); |
| 352 | BUG_ON(!intel_pstate_kobject); |
| 353 | rc = sysfs_create_group(intel_pstate_kobject, |
| 354 | &intel_pstate_attr_group); |
| 355 | BUG_ON(rc); |
| 356 | } |
| 357 | |
| 358 | /************************** sysfs end ************************/ |
Dirk Brandewie | 19e77c2 | 2013-10-21 09:20:35 -0700 | [diff] [blame] | 359 | static int byt_get_min_pstate(void) |
| 360 | { |
| 361 | u64 value; |
| 362 | rdmsrl(BYT_RATIOS, value); |
Dirk Brandewie | 21855ff | 2014-05-08 12:57:23 -0700 | [diff] [blame] | 363 | return (value >> 8) & 0x3F; |
Dirk Brandewie | 19e77c2 | 2013-10-21 09:20:35 -0700 | [diff] [blame] | 364 | } |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 365 | |
Dirk Brandewie | 19e77c2 | 2013-10-21 09:20:35 -0700 | [diff] [blame] | 366 | static int byt_get_max_pstate(void) |
| 367 | { |
| 368 | u64 value; |
| 369 | rdmsrl(BYT_RATIOS, value); |
Dirk Brandewie | 21855ff | 2014-05-08 12:57:23 -0700 | [diff] [blame] | 370 | return (value >> 16) & 0x3F; |
Dirk Brandewie | 19e77c2 | 2013-10-21 09:20:35 -0700 | [diff] [blame] | 371 | } |
| 372 | |
Dirk Brandewie | 61d8d2a | 2014-02-12 10:01:07 -0800 | [diff] [blame] | 373 | static int byt_get_turbo_pstate(void) |
| 374 | { |
| 375 | u64 value; |
| 376 | rdmsrl(BYT_TURBO_RATIOS, value); |
| 377 | return value & 0x3F; |
| 378 | } |
| 379 | |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 380 | static void byt_set_pstate(struct cpudata *cpudata, int pstate) |
| 381 | { |
| 382 | u64 val; |
| 383 | int32_t vid_fp; |
| 384 | u32 vid; |
| 385 | |
| 386 | val = pstate << 8; |
| 387 | if (limits.no_turbo) |
| 388 | val |= (u64)1 << 32; |
| 389 | |
| 390 | vid_fp = cpudata->vid.min + mul_fp( |
| 391 | int_tofp(pstate - cpudata->pstate.min_pstate), |
| 392 | cpudata->vid.ratio); |
| 393 | |
| 394 | vid_fp = clamp_t(int32_t, vid_fp, cpudata->vid.min, cpudata->vid.max); |
| 395 | vid = fp_toint(vid_fp); |
| 396 | |
Dirk Brandewie | 21855ff | 2014-05-08 12:57:23 -0700 | [diff] [blame] | 397 | if (pstate > cpudata->pstate.max_pstate) |
| 398 | vid = cpudata->vid.turbo; |
| 399 | |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 400 | val |= vid; |
| 401 | |
| 402 | wrmsrl(MSR_IA32_PERF_CTL, val); |
| 403 | } |
| 404 | |
| 405 | static void byt_get_vid(struct cpudata *cpudata) |
| 406 | { |
| 407 | u64 value; |
| 408 | |
Dirk Brandewie | 21855ff | 2014-05-08 12:57:23 -0700 | [diff] [blame] | 409 | |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 410 | rdmsrl(BYT_VIDS, value); |
Dirk Brandewie | 21855ff | 2014-05-08 12:57:23 -0700 | [diff] [blame] | 411 | cpudata->vid.min = int_tofp((value >> 8) & 0x3f); |
| 412 | cpudata->vid.max = int_tofp((value >> 16) & 0x3f); |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 413 | cpudata->vid.ratio = div_fp( |
| 414 | cpudata->vid.max - cpudata->vid.min, |
| 415 | int_tofp(cpudata->pstate.max_pstate - |
| 416 | cpudata->pstate.min_pstate)); |
Dirk Brandewie | 21855ff | 2014-05-08 12:57:23 -0700 | [diff] [blame] | 417 | |
| 418 | rdmsrl(BYT_TURBO_VIDS, value); |
| 419 | cpudata->vid.turbo = value & 0x7f; |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 420 | } |
| 421 | |
| 422 | |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 423 | static int core_get_min_pstate(void) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 424 | { |
| 425 | u64 value; |
Konrad Rzeszutek Wilk | 05e99c8cf | 2013-03-20 14:21:10 +0000 | [diff] [blame] | 426 | rdmsrl(MSR_PLATFORM_INFO, value); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 427 | return (value >> 40) & 0xFF; |
| 428 | } |
| 429 | |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 430 | static int core_get_max_pstate(void) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 431 | { |
| 432 | u64 value; |
Konrad Rzeszutek Wilk | 05e99c8cf | 2013-03-20 14:21:10 +0000 | [diff] [blame] | 433 | rdmsrl(MSR_PLATFORM_INFO, value); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 434 | return (value >> 8) & 0xFF; |
| 435 | } |
| 436 | |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 437 | static int core_get_turbo_pstate(void) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 438 | { |
| 439 | u64 value; |
| 440 | int nont, ret; |
Konrad Rzeszutek Wilk | 05e99c8cf | 2013-03-20 14:21:10 +0000 | [diff] [blame] | 441 | rdmsrl(MSR_NHM_TURBO_RATIO_LIMIT, value); |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 442 | nont = core_get_max_pstate(); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 443 | ret = ((value) & 255); |
| 444 | if (ret <= nont) |
| 445 | ret = nont; |
| 446 | return ret; |
| 447 | } |
| 448 | |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 449 | static void core_set_pstate(struct cpudata *cpudata, int pstate) |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 450 | { |
| 451 | u64 val; |
| 452 | |
| 453 | val = pstate << 8; |
| 454 | if (limits.no_turbo) |
| 455 | val |= (u64)1 << 32; |
| 456 | |
Dirk Brandewie | bb18008 | 2014-03-19 08:45:54 -0700 | [diff] [blame] | 457 | wrmsrl_on_cpu(cpudata->cpu, MSR_IA32_PERF_CTL, val); |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 458 | } |
| 459 | |
| 460 | static struct cpu_defaults core_params = { |
| 461 | .pid_policy = { |
| 462 | .sample_rate_ms = 10, |
| 463 | .deadband = 0, |
| 464 | .setpoint = 97, |
| 465 | .p_gain_pct = 20, |
| 466 | .d_gain_pct = 0, |
| 467 | .i_gain_pct = 0, |
| 468 | }, |
| 469 | .funcs = { |
| 470 | .get_max = core_get_max_pstate, |
| 471 | .get_min = core_get_min_pstate, |
| 472 | .get_turbo = core_get_turbo_pstate, |
| 473 | .set = core_set_pstate, |
| 474 | }, |
| 475 | }; |
| 476 | |
Dirk Brandewie | 19e77c2 | 2013-10-21 09:20:35 -0700 | [diff] [blame] | 477 | static struct cpu_defaults byt_params = { |
| 478 | .pid_policy = { |
| 479 | .sample_rate_ms = 10, |
| 480 | .deadband = 0, |
| 481 | .setpoint = 97, |
| 482 | .p_gain_pct = 14, |
| 483 | .d_gain_pct = 0, |
| 484 | .i_gain_pct = 4, |
| 485 | }, |
| 486 | .funcs = { |
| 487 | .get_max = byt_get_max_pstate, |
| 488 | .get_min = byt_get_min_pstate, |
Dirk Brandewie | 61d8d2a | 2014-02-12 10:01:07 -0800 | [diff] [blame] | 489 | .get_turbo = byt_get_turbo_pstate, |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 490 | .set = byt_set_pstate, |
| 491 | .get_vid = byt_get_vid, |
Dirk Brandewie | 19e77c2 | 2013-10-21 09:20:35 -0700 | [diff] [blame] | 492 | }, |
| 493 | }; |
| 494 | |
| 495 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 496 | static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max) |
| 497 | { |
| 498 | int max_perf = cpu->pstate.turbo_pstate; |
Dirk Brandewie | 7244cb6 | 2013-10-21 09:20:33 -0700 | [diff] [blame] | 499 | int max_perf_adj; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 500 | int min_perf; |
| 501 | if (limits.no_turbo) |
| 502 | max_perf = cpu->pstate.max_pstate; |
| 503 | |
Dirk Brandewie | 7244cb6 | 2013-10-21 09:20:33 -0700 | [diff] [blame] | 504 | max_perf_adj = fp_toint(mul_fp(int_tofp(max_perf), limits.max_perf)); |
| 505 | *max = clamp_t(int, max_perf_adj, |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 506 | cpu->pstate.min_pstate, cpu->pstate.turbo_pstate); |
| 507 | |
| 508 | min_perf = fp_toint(mul_fp(int_tofp(max_perf), limits.min_perf)); |
| 509 | *min = clamp_t(int, min_perf, |
| 510 | cpu->pstate.min_pstate, max_perf); |
| 511 | } |
| 512 | |
| 513 | static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate) |
| 514 | { |
| 515 | int max_perf, min_perf; |
| 516 | |
| 517 | intel_pstate_get_min_max(cpu, &min_perf, &max_perf); |
| 518 | |
| 519 | pstate = clamp_t(int, pstate, min_perf, max_perf); |
| 520 | |
| 521 | if (pstate == cpu->pstate.current_pstate) |
| 522 | return; |
| 523 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 524 | trace_cpu_frequency(pstate * 100000, cpu->cpu); |
Dirk Brandewie | 35363e9 | 2013-05-07 08:20:30 -0700 | [diff] [blame] | 525 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 526 | cpu->pstate.current_pstate = pstate; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 527 | |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 528 | pstate_funcs.set(cpu, pstate); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 529 | } |
| 530 | |
| 531 | static inline void intel_pstate_pstate_increase(struct cpudata *cpu, int steps) |
| 532 | { |
| 533 | int target; |
| 534 | target = cpu->pstate.current_pstate + steps; |
| 535 | |
| 536 | intel_pstate_set_pstate(cpu, target); |
| 537 | } |
| 538 | |
| 539 | static inline void intel_pstate_pstate_decrease(struct cpudata *cpu, int steps) |
| 540 | { |
| 541 | int target; |
| 542 | target = cpu->pstate.current_pstate - steps; |
| 543 | intel_pstate_set_pstate(cpu, target); |
| 544 | } |
| 545 | |
| 546 | static void intel_pstate_get_cpu_pstates(struct cpudata *cpu) |
| 547 | { |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 548 | cpu->pstate.min_pstate = pstate_funcs.get_min(); |
| 549 | cpu->pstate.max_pstate = pstate_funcs.get_max(); |
| 550 | cpu->pstate.turbo_pstate = pstate_funcs.get_turbo(); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 551 | |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 552 | if (pstate_funcs.get_vid) |
| 553 | pstate_funcs.get_vid(cpu); |
Dirk Brandewie | d40a63c | 2014-05-08 12:57:24 -0700 | [diff] [blame] | 554 | intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 555 | } |
| 556 | |
Stratos Karafotis | 6b17ddb | 2014-04-29 20:53:49 +0300 | [diff] [blame] | 557 | static inline void intel_pstate_calc_busy(struct cpudata *cpu) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 558 | { |
Stratos Karafotis | 6b17ddb | 2014-04-29 20:53:49 +0300 | [diff] [blame] | 559 | struct sample *sample = &cpu->sample; |
Doug Smythies | bf81022 | 2014-05-30 10:10:57 -0700 | [diff] [blame] | 560 | int64_t core_pct; |
| 561 | int32_t rem; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 562 | |
Doug Smythies | bf81022 | 2014-05-30 10:10:57 -0700 | [diff] [blame] | 563 | core_pct = int_tofp(sample->aperf) * int_tofp(100); |
| 564 | core_pct = div_u64_rem(core_pct, int_tofp(sample->mperf), &rem); |
| 565 | |
| 566 | if ((rem << 1) >= int_tofp(sample->mperf)) |
| 567 | core_pct += 1; |
Dirk Brandewie | fcb6a15 | 2014-02-03 08:55:31 -0800 | [diff] [blame] | 568 | |
Dirk Brandewie | fcb6a15 | 2014-02-03 08:55:31 -0800 | [diff] [blame] | 569 | sample->freq = fp_toint( |
Dirk Brandewie | e66c176 | 2014-02-25 10:35:37 -0800 | [diff] [blame] | 570 | mul_fp(int_tofp(cpu->pstate.max_pstate * 1000), core_pct)); |
Dirk Brandewie | fcb6a15 | 2014-02-03 08:55:31 -0800 | [diff] [blame] | 571 | |
Doug Smythies | bf81022 | 2014-05-30 10:10:57 -0700 | [diff] [blame] | 572 | sample->core_pct_busy = (int32_t)core_pct; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 573 | } |
| 574 | |
| 575 | static inline void intel_pstate_sample(struct cpudata *cpu) |
| 576 | { |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 577 | u64 aperf, mperf; |
| 578 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 579 | rdmsrl(MSR_IA32_APERF, aperf); |
| 580 | rdmsrl(MSR_IA32_MPERF, mperf); |
Dirk Brandewie | b69880f | 2014-01-16 10:32:25 -0800 | [diff] [blame] | 581 | |
Dirk Brandewie | e66c176 | 2014-02-25 10:35:37 -0800 | [diff] [blame] | 582 | aperf = aperf >> FRAC_BITS; |
| 583 | mperf = mperf >> FRAC_BITS; |
Dirk Brandewie | e66c176 | 2014-02-25 10:35:37 -0800 | [diff] [blame] | 584 | |
Dirk Brandewie | c4ee841 | 2014-05-29 09:32:24 -0700 | [diff] [blame] | 585 | cpu->last_sample_time = cpu->sample.time; |
| 586 | cpu->sample.time = ktime_get(); |
Dirk Brandewie | d37e2b7 | 2014-02-12 10:01:04 -0800 | [diff] [blame] | 587 | cpu->sample.aperf = aperf; |
| 588 | cpu->sample.mperf = mperf; |
Dirk Brandewie | d37e2b7 | 2014-02-12 10:01:04 -0800 | [diff] [blame] | 589 | cpu->sample.aperf -= cpu->prev_aperf; |
| 590 | cpu->sample.mperf -= cpu->prev_mperf; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 591 | |
Stratos Karafotis | 6b17ddb | 2014-04-29 20:53:49 +0300 | [diff] [blame] | 592 | intel_pstate_calc_busy(cpu); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 593 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 594 | cpu->prev_aperf = aperf; |
| 595 | cpu->prev_mperf = mperf; |
| 596 | } |
| 597 | |
| 598 | static inline void intel_pstate_set_sample_time(struct cpudata *cpu) |
| 599 | { |
| 600 | int sample_time, delay; |
| 601 | |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 602 | sample_time = pid_params.sample_rate_ms; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 603 | delay = msecs_to_jiffies(sample_time); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 604 | mod_timer_pinned(&cpu->timer, jiffies + delay); |
| 605 | } |
| 606 | |
Brennan Shacklett | d253d2a | 2013-10-21 09:20:32 -0700 | [diff] [blame] | 607 | static inline int32_t intel_pstate_get_scaled_busy(struct cpudata *cpu) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 608 | { |
Dirk Brandewie | c4ee841 | 2014-05-29 09:32:24 -0700 | [diff] [blame] | 609 | int32_t core_busy, max_pstate, current_pstate, sample_ratio; |
| 610 | u32 duration_us; |
| 611 | u32 sample_time; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 612 | |
Dirk Brandewie | d37e2b7 | 2014-02-12 10:01:04 -0800 | [diff] [blame] | 613 | core_busy = cpu->sample.core_pct_busy; |
Dirk Brandewie | 2134ed4 | 2013-07-18 08:48:42 -0700 | [diff] [blame] | 614 | max_pstate = int_tofp(cpu->pstate.max_pstate); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 615 | current_pstate = int_tofp(cpu->pstate.current_pstate); |
Dirk Brandewie | e66c176 | 2014-02-25 10:35:37 -0800 | [diff] [blame] | 616 | core_busy = mul_fp(core_busy, div_fp(max_pstate, current_pstate)); |
Dirk Brandewie | c4ee841 | 2014-05-29 09:32:24 -0700 | [diff] [blame] | 617 | |
| 618 | sample_time = (pid_params.sample_rate_ms * USEC_PER_MSEC); |
| 619 | duration_us = (u32) ktime_us_delta(cpu->sample.time, |
| 620 | cpu->last_sample_time); |
| 621 | if (duration_us > sample_time * 3) { |
| 622 | sample_ratio = div_fp(int_tofp(sample_time), |
| 623 | int_tofp(duration_us)); |
| 624 | core_busy = mul_fp(core_busy, sample_ratio); |
| 625 | } |
| 626 | |
Dirk Brandewie | f0fe3cd | 2014-05-29 09:32:23 -0700 | [diff] [blame] | 627 | return core_busy; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 628 | } |
| 629 | |
| 630 | static inline void intel_pstate_adjust_busy_pstate(struct cpudata *cpu) |
| 631 | { |
Brennan Shacklett | d253d2a | 2013-10-21 09:20:32 -0700 | [diff] [blame] | 632 | int32_t busy_scaled; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 633 | struct _pid *pid; |
| 634 | signed int ctl = 0; |
| 635 | int steps; |
| 636 | |
| 637 | pid = &cpu->pid; |
| 638 | busy_scaled = intel_pstate_get_scaled_busy(cpu); |
| 639 | |
| 640 | ctl = pid_calc(pid, busy_scaled); |
| 641 | |
| 642 | steps = abs(ctl); |
Dirk Brandewie | b69880f | 2014-01-16 10:32:25 -0800 | [diff] [blame] | 643 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 644 | if (ctl < 0) |
| 645 | intel_pstate_pstate_increase(cpu, steps); |
| 646 | else |
| 647 | intel_pstate_pstate_decrease(cpu, steps); |
| 648 | } |
| 649 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 650 | static void intel_pstate_timer_func(unsigned long __data) |
| 651 | { |
| 652 | struct cpudata *cpu = (struct cpudata *) __data; |
Dirk Brandewie | b69880f | 2014-01-16 10:32:25 -0800 | [diff] [blame] | 653 | struct sample *sample; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 654 | |
| 655 | intel_pstate_sample(cpu); |
Dirk Brandewie | b69880f | 2014-01-16 10:32:25 -0800 | [diff] [blame] | 656 | |
Dirk Brandewie | d37e2b7 | 2014-02-12 10:01:04 -0800 | [diff] [blame] | 657 | sample = &cpu->sample; |
Dirk Brandewie | b69880f | 2014-01-16 10:32:25 -0800 | [diff] [blame] | 658 | |
Dirk Brandewie | ca182ae | 2013-05-07 08:20:27 -0700 | [diff] [blame] | 659 | intel_pstate_adjust_busy_pstate(cpu); |
Dirk Brandewie | b69880f | 2014-01-16 10:32:25 -0800 | [diff] [blame] | 660 | |
| 661 | trace_pstate_sample(fp_toint(sample->core_pct_busy), |
| 662 | fp_toint(intel_pstate_get_scaled_busy(cpu)), |
| 663 | cpu->pstate.current_pstate, |
| 664 | sample->mperf, |
| 665 | sample->aperf, |
Dirk Brandewie | b69880f | 2014-01-16 10:32:25 -0800 | [diff] [blame] | 666 | sample->freq); |
| 667 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 668 | intel_pstate_set_sample_time(cpu); |
| 669 | } |
| 670 | |
| 671 | #define ICPU(model, policy) \ |
Dirk Brandewie | 6cbd7ee | 2014-01-06 10:59:16 -0800 | [diff] [blame] | 672 | { X86_VENDOR_INTEL, 6, model, X86_FEATURE_APERFMPERF,\ |
| 673 | (unsigned long)&policy } |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 674 | |
| 675 | static const struct x86_cpu_id intel_pstate_cpu_ids[] = { |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 676 | ICPU(0x2a, core_params), |
| 677 | ICPU(0x2d, core_params), |
Dirk Brandewie | 19e77c2 | 2013-10-21 09:20:35 -0700 | [diff] [blame] | 678 | ICPU(0x37, byt_params), |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 679 | ICPU(0x3a, core_params), |
| 680 | ICPU(0x3c, core_params), |
Dirk Brandewie | c7e241d | 2014-05-08 12:57:27 -0700 | [diff] [blame] | 681 | ICPU(0x3d, core_params), |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 682 | ICPU(0x3e, core_params), |
| 683 | ICPU(0x3f, core_params), |
| 684 | ICPU(0x45, core_params), |
| 685 | ICPU(0x46, core_params), |
Dirk Brandewie | c7e241d | 2014-05-08 12:57:27 -0700 | [diff] [blame] | 686 | ICPU(0x4f, core_params), |
| 687 | ICPU(0x56, core_params), |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 688 | {} |
| 689 | }; |
| 690 | MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids); |
| 691 | |
| 692 | static int intel_pstate_init_cpu(unsigned int cpunum) |
| 693 | { |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 694 | struct cpudata *cpu; |
| 695 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 696 | all_cpu_data[cpunum] = kzalloc(sizeof(struct cpudata), GFP_KERNEL); |
| 697 | if (!all_cpu_data[cpunum]) |
| 698 | return -ENOMEM; |
| 699 | |
| 700 | cpu = all_cpu_data[cpunum]; |
| 701 | |
| 702 | intel_pstate_get_cpu_pstates(cpu); |
| 703 | |
| 704 | cpu->cpu = cpunum; |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 705 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 706 | init_timer_deferrable(&cpu->timer); |
| 707 | cpu->timer.function = intel_pstate_timer_func; |
| 708 | cpu->timer.data = |
| 709 | (unsigned long)cpu; |
| 710 | cpu->timer.expires = jiffies + HZ/100; |
| 711 | intel_pstate_busy_pid_reset(cpu); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 712 | intel_pstate_sample(cpu); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 713 | |
| 714 | add_timer_on(&cpu->timer, cpunum); |
| 715 | |
| 716 | pr_info("Intel pstate controlling: cpu %d\n", cpunum); |
| 717 | |
| 718 | return 0; |
| 719 | } |
| 720 | |
| 721 | static unsigned int intel_pstate_get(unsigned int cpu_num) |
| 722 | { |
| 723 | struct sample *sample; |
| 724 | struct cpudata *cpu; |
| 725 | |
| 726 | cpu = all_cpu_data[cpu_num]; |
| 727 | if (!cpu) |
| 728 | return 0; |
Dirk Brandewie | d37e2b7 | 2014-02-12 10:01:04 -0800 | [diff] [blame] | 729 | sample = &cpu->sample; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 730 | return sample->freq; |
| 731 | } |
| 732 | |
| 733 | static int intel_pstate_set_policy(struct cpufreq_policy *policy) |
| 734 | { |
| 735 | struct cpudata *cpu; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 736 | |
| 737 | cpu = all_cpu_data[policy->cpu]; |
| 738 | |
Dirk Brandewie | d3929b8 | 2013-03-05 14:15:26 -0800 | [diff] [blame] | 739 | if (!policy->cpuinfo.max_freq) |
| 740 | return -ENODEV; |
| 741 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 742 | if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) { |
| 743 | limits.min_perf_pct = 100; |
| 744 | limits.min_perf = int_tofp(1); |
| 745 | limits.max_perf_pct = 100; |
| 746 | limits.max_perf = int_tofp(1); |
| 747 | limits.no_turbo = 0; |
Srinivas Pandruvada | d1b6848 | 2013-04-09 22:38:18 +0000 | [diff] [blame] | 748 | return 0; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 749 | } |
Srinivas Pandruvada | d1b6848 | 2013-04-09 22:38:18 +0000 | [diff] [blame] | 750 | limits.min_perf_pct = (policy->min * 100) / policy->cpuinfo.max_freq; |
| 751 | limits.min_perf_pct = clamp_t(int, limits.min_perf_pct, 0 , 100); |
| 752 | limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100)); |
| 753 | |
Dirk Brandewie | d8f469e | 2013-05-07 08:20:26 -0700 | [diff] [blame] | 754 | limits.max_policy_pct = policy->max * 100 / policy->cpuinfo.max_freq; |
| 755 | limits.max_policy_pct = clamp_t(int, limits.max_policy_pct, 0 , 100); |
| 756 | limits.max_perf_pct = min(limits.max_policy_pct, limits.max_sysfs_pct); |
Srinivas Pandruvada | d1b6848 | 2013-04-09 22:38:18 +0000 | [diff] [blame] | 757 | 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] | 758 | |
| 759 | return 0; |
| 760 | } |
| 761 | |
| 762 | static int intel_pstate_verify_policy(struct cpufreq_policy *policy) |
| 763 | { |
Viresh Kumar | be49e34 | 2013-10-02 14:13:19 +0530 | [diff] [blame] | 764 | cpufreq_verify_within_cpu_limits(policy); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 765 | |
| 766 | if ((policy->policy != CPUFREQ_POLICY_POWERSAVE) && |
| 767 | (policy->policy != CPUFREQ_POLICY_PERFORMANCE)) |
| 768 | return -EINVAL; |
| 769 | |
| 770 | return 0; |
| 771 | } |
| 772 | |
Dirk Brandewie | bb18008 | 2014-03-19 08:45:54 -0700 | [diff] [blame] | 773 | static void intel_pstate_stop_cpu(struct cpufreq_policy *policy) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 774 | { |
Dirk Brandewie | bb18008 | 2014-03-19 08:45:54 -0700 | [diff] [blame] | 775 | int cpu_num = policy->cpu; |
| 776 | struct cpudata *cpu = all_cpu_data[cpu_num]; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 777 | |
Dirk Brandewie | bb18008 | 2014-03-19 08:45:54 -0700 | [diff] [blame] | 778 | pr_info("intel_pstate CPU %d exiting\n", cpu_num); |
| 779 | |
Dirk Brandewie | c2294a2 | 2014-03-24 07:41:29 -0700 | [diff] [blame] | 780 | del_timer_sync(&all_cpu_data[cpu_num]->timer); |
Dirk Brandewie | bb18008 | 2014-03-19 08:45:54 -0700 | [diff] [blame] | 781 | intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate); |
| 782 | kfree(all_cpu_data[cpu_num]); |
| 783 | all_cpu_data[cpu_num] = NULL; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 784 | } |
| 785 | |
Paul Gortmaker | 2760984 | 2013-06-19 13:54:04 -0400 | [diff] [blame] | 786 | static int intel_pstate_cpu_init(struct cpufreq_policy *policy) |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 787 | { |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 788 | struct cpudata *cpu; |
Dirk Brandewie | 52e0a50 | 2013-10-15 11:06:14 -0700 | [diff] [blame] | 789 | int rc; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 790 | |
| 791 | rc = intel_pstate_init_cpu(policy->cpu); |
| 792 | if (rc) |
| 793 | return rc; |
| 794 | |
| 795 | cpu = all_cpu_data[policy->cpu]; |
| 796 | |
| 797 | if (!limits.no_turbo && |
| 798 | limits.min_perf_pct == 100 && limits.max_perf_pct == 100) |
| 799 | policy->policy = CPUFREQ_POLICY_PERFORMANCE; |
| 800 | else |
| 801 | policy->policy = CPUFREQ_POLICY_POWERSAVE; |
| 802 | |
Dirk Brandewie | 52e0a50 | 2013-10-15 11:06:14 -0700 | [diff] [blame] | 803 | policy->min = cpu->pstate.min_pstate * 100000; |
| 804 | policy->max = cpu->pstate.turbo_pstate * 100000; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 805 | |
| 806 | /* cpuinfo and default policy values */ |
| 807 | policy->cpuinfo.min_freq = cpu->pstate.min_pstate * 100000; |
| 808 | policy->cpuinfo.max_freq = cpu->pstate.turbo_pstate * 100000; |
| 809 | policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL; |
| 810 | cpumask_set_cpu(policy->cpu, policy->cpus); |
| 811 | |
| 812 | return 0; |
| 813 | } |
| 814 | |
| 815 | static struct cpufreq_driver intel_pstate_driver = { |
| 816 | .flags = CPUFREQ_CONST_LOOPS, |
| 817 | .verify = intel_pstate_verify_policy, |
| 818 | .setpolicy = intel_pstate_set_policy, |
| 819 | .get = intel_pstate_get, |
| 820 | .init = intel_pstate_cpu_init, |
Dirk Brandewie | bb18008 | 2014-03-19 08:45:54 -0700 | [diff] [blame] | 821 | .stop_cpu = intel_pstate_stop_cpu, |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 822 | .name = "intel_pstate", |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 823 | }; |
| 824 | |
Dirk Brandewie | 6be2649 | 2013-02-15 22:55:10 +0100 | [diff] [blame] | 825 | static int __initdata no_load; |
| 826 | |
Dirk Brandewie | b563b4e | 2013-03-22 01:29:28 +0100 | [diff] [blame] | 827 | static int intel_pstate_msrs_not_valid(void) |
| 828 | { |
| 829 | /* Check that all the msr's we are using are valid. */ |
| 830 | u64 aperf, mperf, tmp; |
| 831 | |
| 832 | rdmsrl(MSR_IA32_APERF, aperf); |
| 833 | rdmsrl(MSR_IA32_MPERF, mperf); |
| 834 | |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 835 | if (!pstate_funcs.get_max() || |
| 836 | !pstate_funcs.get_min() || |
| 837 | !pstate_funcs.get_turbo()) |
Dirk Brandewie | b563b4e | 2013-03-22 01:29:28 +0100 | [diff] [blame] | 838 | return -ENODEV; |
| 839 | |
| 840 | rdmsrl(MSR_IA32_APERF, tmp); |
| 841 | if (!(tmp - aperf)) |
| 842 | return -ENODEV; |
| 843 | |
| 844 | rdmsrl(MSR_IA32_MPERF, tmp); |
| 845 | if (!(tmp - mperf)) |
| 846 | return -ENODEV; |
| 847 | |
| 848 | return 0; |
| 849 | } |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 850 | |
Dirk Brandewie | e0a261a | 2013-10-30 08:38:32 -0700 | [diff] [blame] | 851 | static void copy_pid_params(struct pstate_adjust_policy *policy) |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 852 | { |
| 853 | pid_params.sample_rate_ms = policy->sample_rate_ms; |
| 854 | pid_params.p_gain_pct = policy->p_gain_pct; |
| 855 | pid_params.i_gain_pct = policy->i_gain_pct; |
| 856 | pid_params.d_gain_pct = policy->d_gain_pct; |
| 857 | pid_params.deadband = policy->deadband; |
| 858 | pid_params.setpoint = policy->setpoint; |
| 859 | } |
| 860 | |
Dirk Brandewie | e0a261a | 2013-10-30 08:38:32 -0700 | [diff] [blame] | 861 | static void copy_cpu_funcs(struct pstate_funcs *funcs) |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 862 | { |
| 863 | pstate_funcs.get_max = funcs->get_max; |
| 864 | pstate_funcs.get_min = funcs->get_min; |
| 865 | pstate_funcs.get_turbo = funcs->get_turbo; |
| 866 | pstate_funcs.set = funcs->set; |
Dirk Brandewie | 007bea0 | 2013-12-18 10:32:39 -0800 | [diff] [blame] | 867 | pstate_funcs.get_vid = funcs->get_vid; |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 868 | } |
| 869 | |
Adrian Huang | fbbcdc0 | 2013-10-31 23:24:05 +0800 | [diff] [blame] | 870 | #if IS_ENABLED(CONFIG_ACPI) |
| 871 | #include <acpi/processor.h> |
| 872 | |
| 873 | static bool intel_pstate_no_acpi_pss(void) |
| 874 | { |
| 875 | int i; |
| 876 | |
| 877 | for_each_possible_cpu(i) { |
| 878 | acpi_status status; |
| 879 | union acpi_object *pss; |
| 880 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 881 | struct acpi_processor *pr = per_cpu(processors, i); |
| 882 | |
| 883 | if (!pr) |
| 884 | continue; |
| 885 | |
| 886 | status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); |
| 887 | if (ACPI_FAILURE(status)) |
| 888 | continue; |
| 889 | |
| 890 | pss = buffer.pointer; |
| 891 | if (pss && pss->type == ACPI_TYPE_PACKAGE) { |
| 892 | kfree(pss); |
| 893 | return false; |
| 894 | } |
| 895 | |
| 896 | kfree(pss); |
| 897 | } |
| 898 | |
| 899 | return true; |
| 900 | } |
| 901 | |
| 902 | struct hw_vendor_info { |
| 903 | u16 valid; |
| 904 | char oem_id[ACPI_OEM_ID_SIZE]; |
| 905 | char oem_table_id[ACPI_OEM_TABLE_ID_SIZE]; |
| 906 | }; |
| 907 | |
| 908 | /* Hardware vendor-specific info that has its own power management modes */ |
| 909 | static struct hw_vendor_info vendor_info[] = { |
| 910 | {1, "HP ", "ProLiant"}, |
| 911 | {0, "", ""}, |
| 912 | }; |
| 913 | |
| 914 | static bool intel_pstate_platform_pwr_mgmt_exists(void) |
| 915 | { |
| 916 | struct acpi_table_header hdr; |
| 917 | struct hw_vendor_info *v_info; |
| 918 | |
| 919 | if (acpi_disabled |
| 920 | || ACPI_FAILURE(acpi_get_table_header(ACPI_SIG_FADT, 0, &hdr))) |
| 921 | return false; |
| 922 | |
| 923 | for (v_info = vendor_info; v_info->valid; v_info++) { |
| 924 | if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE) |
| 925 | && !strncmp(hdr.oem_table_id, v_info->oem_table_id, ACPI_OEM_TABLE_ID_SIZE) |
| 926 | && intel_pstate_no_acpi_pss()) |
| 927 | return true; |
| 928 | } |
| 929 | |
| 930 | return false; |
| 931 | } |
| 932 | #else /* CONFIG_ACPI not enabled */ |
| 933 | static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; } |
| 934 | #endif /* CONFIG_ACPI */ |
| 935 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 936 | static int __init intel_pstate_init(void) |
| 937 | { |
Dirk Brandewie | 907cc90 | 2013-03-05 14:15:27 -0800 | [diff] [blame] | 938 | int cpu, rc = 0; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 939 | const struct x86_cpu_id *id; |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 940 | struct cpu_defaults *cpu_info; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 941 | |
Dirk Brandewie | 6be2649 | 2013-02-15 22:55:10 +0100 | [diff] [blame] | 942 | if (no_load) |
| 943 | return -ENODEV; |
| 944 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 945 | id = x86_match_cpu(intel_pstate_cpu_ids); |
| 946 | if (!id) |
| 947 | return -ENODEV; |
| 948 | |
Adrian Huang | fbbcdc0 | 2013-10-31 23:24:05 +0800 | [diff] [blame] | 949 | /* |
| 950 | * The Intel pstate driver will be ignored if the platform |
| 951 | * firmware has its own power management modes. |
| 952 | */ |
| 953 | if (intel_pstate_platform_pwr_mgmt_exists()) |
| 954 | return -ENODEV; |
| 955 | |
Dirk Brandewie | 016c815 | 2013-10-21 09:20:34 -0700 | [diff] [blame] | 956 | cpu_info = (struct cpu_defaults *)id->driver_data; |
| 957 | |
| 958 | copy_pid_params(&cpu_info->pid_policy); |
| 959 | copy_cpu_funcs(&cpu_info->funcs); |
| 960 | |
Dirk Brandewie | b563b4e | 2013-03-22 01:29:28 +0100 | [diff] [blame] | 961 | if (intel_pstate_msrs_not_valid()) |
| 962 | return -ENODEV; |
| 963 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 964 | pr_info("Intel P-state driver initializing.\n"); |
| 965 | |
Wei Yongjun | b57ffac | 2013-05-13 08:03:43 +0000 | [diff] [blame] | 966 | all_cpu_data = vzalloc(sizeof(void *) * num_possible_cpus()); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 967 | if (!all_cpu_data) |
| 968 | return -ENOMEM; |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 969 | |
| 970 | rc = cpufreq_register_driver(&intel_pstate_driver); |
| 971 | if (rc) |
| 972 | goto out; |
| 973 | |
| 974 | intel_pstate_debug_expose_params(); |
| 975 | intel_pstate_sysfs_expose_params(); |
Dirk Brandewie | b69880f | 2014-01-16 10:32:25 -0800 | [diff] [blame] | 976 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 977 | return rc; |
| 978 | out: |
Dirk Brandewie | 907cc90 | 2013-03-05 14:15:27 -0800 | [diff] [blame] | 979 | get_online_cpus(); |
| 980 | for_each_online_cpu(cpu) { |
| 981 | if (all_cpu_data[cpu]) { |
| 982 | del_timer_sync(&all_cpu_data[cpu]->timer); |
| 983 | kfree(all_cpu_data[cpu]); |
| 984 | } |
| 985 | } |
| 986 | |
| 987 | put_online_cpus(); |
| 988 | vfree(all_cpu_data); |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 989 | return -ENODEV; |
| 990 | } |
| 991 | device_initcall(intel_pstate_init); |
| 992 | |
Dirk Brandewie | 6be2649 | 2013-02-15 22:55:10 +0100 | [diff] [blame] | 993 | static int __init intel_pstate_setup(char *str) |
| 994 | { |
| 995 | if (!str) |
| 996 | return -EINVAL; |
| 997 | |
| 998 | if (!strcmp(str, "disable")) |
| 999 | no_load = 1; |
| 1000 | return 0; |
| 1001 | } |
| 1002 | early_param("intel_pstate", intel_pstate_setup); |
| 1003 | |
Dirk Brandewie | 93f0822 | 2013-02-06 09:02:13 -0800 | [diff] [blame] | 1004 | MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@intel.com>"); |
| 1005 | MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors"); |
| 1006 | MODULE_LICENSE("GPL"); |