intel_pstate.c 33.9 KB
Newer Older
1
/*
2
 * intel_pstate.c: Native P state management for Intel processors
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
 *
 * (C) Copyright 2012 Intel Corporation
 * Author: Dirk Brandewie <dirk.j.brandewie@intel.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; version 2
 * of the License.
 */

#include <linux/kernel.h>
#include <linux/kernel_stat.h>
#include <linux/module.h>
#include <linux/ktime.h>
#include <linux/hrtimer.h>
#include <linux/tick.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/list.h>
#include <linux/cpu.h>
#include <linux/cpufreq.h>
#include <linux/sysfs.h>
#include <linux/types.h>
#include <linux/fs.h>
#include <linux/debugfs.h>
28
#include <linux/acpi.h>
29
#include <linux/vmalloc.h>
30 31 32 33 34
#include <trace/events/power.h>

#include <asm/div64.h>
#include <asm/msr.h>
#include <asm/cpu_device_id.h>
35
#include <asm/cpufeature.h>
36

37 38 39 40
#define ATOM_RATIOS		0x66a
#define ATOM_VIDS		0x66b
#define ATOM_TURBO_RATIOS	0x66c
#define ATOM_TURBO_VIDS		0x66d
41

42
#define FRAC_BITS 8
43 44
#define int_tofp(X) ((int64_t)(X) << FRAC_BITS)
#define fp_toint(X) ((X) >> FRAC_BITS)
45

46 47 48 49 50
static inline int32_t mul_fp(int32_t x, int32_t y)
{
	return ((int64_t)x * (int64_t)y) >> FRAC_BITS;
}

51
static inline int32_t div_fp(s64 x, s64 y)
52
{
53
	return div64_s64((int64_t)x << FRAC_BITS, y);
54 55
}

56 57 58 59 60 61 62 63 64 65 66
static inline int ceiling_fp(int32_t x)
{
	int mask, ret;

	ret = fp_toint(x);
	mask = (1 << FRAC_BITS) - 1;
	if (x & mask)
		ret += 1;
	return ret;
}

67
struct sample {
68
	int32_t core_pct_busy;
69
	int32_t busy_scaled;
70 71
	u64 aperf;
	u64 mperf;
72
	u64 tsc;
73
	int freq;
74
	ktime_t time;
75 76 77 78 79 80
};

struct pstate_data {
	int	current_pstate;
	int	min_pstate;
	int	max_pstate;
81
	int	max_pstate_physical;
82
	int	scaling;
83 84 85
	int	turbo_pstate;
};

86
struct vid_data {
87 88 89
	int min;
	int max;
	int turbo;
90 91 92
	int32_t ratio;
};

93 94 95 96 97 98 99
struct _pid {
	int setpoint;
	int32_t integral;
	int32_t p_gain;
	int32_t i_gain;
	int32_t d_gain;
	int deadband;
100
	int32_t last_err;
101 102 103 104 105 106 107 108
};

struct cpudata {
	int cpu;

	struct timer_list timer;

	struct pstate_data pstate;
109
	struct vid_data vid;
110 111
	struct _pid pid;

112
	ktime_t last_sample_time;
113 114
	u64	prev_aperf;
	u64	prev_mperf;
115
	u64	prev_tsc;
116
	struct sample sample;
117 118 119 120 121 122 123 124 125 126 127 128
};

static struct cpudata **all_cpu_data;
struct pstate_adjust_policy {
	int sample_rate_ms;
	int deadband;
	int setpoint;
	int p_gain_pct;
	int d_gain_pct;
	int i_gain_pct;
};

129 130
struct pstate_funcs {
	int (*get_max)(void);
131
	int (*get_max_physical)(void);
132 133
	int (*get_min)(void);
	int (*get_turbo)(void);
134
	int (*get_scaling)(void);
135 136
	void (*set)(struct cpudata*, int pstate);
	void (*get_vid)(struct cpudata *);
137
	int32_t (*get_target_pstate)(struct cpudata *);
138 139
};

140 141 142
struct cpu_defaults {
	struct pstate_adjust_policy pid_policy;
	struct pstate_funcs funcs;
143 144
};

145
static inline int32_t get_target_pstate_use_performance(struct cpudata *cpu);
146
static inline int32_t get_target_pstate_use_cpu_load(struct cpudata *cpu);
147

148 149
static struct pstate_adjust_policy pid_params;
static struct pstate_funcs pstate_funcs;
D
Dirk Brandewie 已提交
150
static int hwp_active;
151

152 153
struct perf_limits {
	int no_turbo;
154
	int turbo_disabled;
155 156 157 158
	int max_perf_pct;
	int min_perf_pct;
	int32_t max_perf;
	int32_t min_perf;
159 160
	int max_policy_pct;
	int max_sysfs_pct;
161 162
	int min_policy_pct;
	int min_sysfs_pct;
163 164
};

165 166 167 168 169 170 171 172 173 174 175 176 177 178
static struct perf_limits performance_limits = {
	.no_turbo = 0,
	.turbo_disabled = 0,
	.max_perf_pct = 100,
	.max_perf = int_tofp(1),
	.min_perf_pct = 100,
	.min_perf = int_tofp(1),
	.max_policy_pct = 100,
	.max_sysfs_pct = 100,
	.min_policy_pct = 0,
	.min_sysfs_pct = 0,
};

static struct perf_limits powersave_limits = {
179
	.no_turbo = 0,
180
	.turbo_disabled = 0,
181 182 183 184
	.max_perf_pct = 100,
	.max_perf = int_tofp(1),
	.min_perf_pct = 0,
	.min_perf = 0,
185 186
	.max_policy_pct = 100,
	.max_sysfs_pct = 100,
187 188
	.min_policy_pct = 0,
	.min_sysfs_pct = 0,
189 190
};

191 192 193 194 195 196
#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
static struct perf_limits *limits = &performance_limits;
#else
static struct perf_limits *limits = &powersave_limits;
#endif

197
static inline void pid_reset(struct _pid *pid, int setpoint, int busy,
198
			     int deadband, int integral) {
199 200 201
	pid->setpoint = setpoint;
	pid->deadband  = deadband;
	pid->integral  = int_tofp(integral);
202
	pid->last_err  = int_tofp(setpoint) - int_tofp(busy);
203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219
}

static inline void pid_p_gain_set(struct _pid *pid, int percent)
{
	pid->p_gain = div_fp(int_tofp(percent), int_tofp(100));
}

static inline void pid_i_gain_set(struct _pid *pid, int percent)
{
	pid->i_gain = div_fp(int_tofp(percent), int_tofp(100));
}

static inline void pid_d_gain_set(struct _pid *pid, int percent)
{
	pid->d_gain = div_fp(int_tofp(percent), int_tofp(100));
}

220
static signed int pid_calc(struct _pid *pid, int32_t busy)
221
{
222
	signed int result;
223 224 225
	int32_t pterm, dterm, fp_error;
	int32_t integral_limit;

226
	fp_error = int_tofp(pid->setpoint) - busy;
227

228
	if (abs(fp_error) <= int_tofp(pid->deadband))
229 230 231 232 233 234
		return 0;

	pterm = mul_fp(pid->p_gain, fp_error);

	pid->integral += fp_error;

235 236 237 238 239 240 241 242
	/*
	 * We limit the integral here so that it will never
	 * get higher than 30.  This prevents it from becoming
	 * too large an input over long periods of time and allows
	 * it to get factored out sooner.
	 *
	 * The value of 30 was chosen through experimentation.
	 */
243 244 245 246 247 248
	integral_limit = int_tofp(30);
	if (pid->integral > integral_limit)
		pid->integral = integral_limit;
	if (pid->integral < -integral_limit)
		pid->integral = -integral_limit;

249 250
	dterm = mul_fp(pid->d_gain, fp_error - pid->last_err);
	pid->last_err = fp_error;
251 252

	result = pterm + mul_fp(pid->integral, pid->i_gain) + dterm;
253
	result = result + (1 << (FRAC_BITS-1));
254 255 256 257 258
	return (signed int)fp_toint(result);
}

static inline void intel_pstate_busy_pid_reset(struct cpudata *cpu)
{
259 260 261
	pid_p_gain_set(&cpu->pid, pid_params.p_gain_pct);
	pid_d_gain_set(&cpu->pid, pid_params.d_gain_pct);
	pid_i_gain_set(&cpu->pid, pid_params.i_gain_pct);
262

263
	pid_reset(&cpu->pid, pid_params.setpoint, 100, pid_params.deadband, 0);
264 265 266 267 268
}

static inline void intel_pstate_reset_all_pid(void)
{
	unsigned int cpu;
269

270 271 272 273 274 275
	for_each_online_cpu(cpu) {
		if (all_cpu_data[cpu])
			intel_pstate_busy_pid_reset(all_cpu_data[cpu]);
	}
}

276 277 278 279 280 281 282
static inline void update_turbo_state(void)
{
	u64 misc_en;
	struct cpudata *cpu;

	cpu = all_cpu_data[0];
	rdmsrl(MSR_IA32_MISC_ENABLE, misc_en);
283
	limits->turbo_disabled =
284 285 286 287
		(misc_en & MSR_IA32_MISC_ENABLE_TURBO_DISABLE ||
		 cpu->pstate.max_pstate == cpu->pstate.turbo_pstate);
}

D
Dirk Brandewie 已提交
288 289
static void intel_pstate_hwp_set(void)
{
290 291 292 293 294 295 296
	int min, hw_min, max, hw_max, cpu, range, adj_range;
	u64 value, cap;

	rdmsrl(MSR_HWP_CAPABILITIES, cap);
	hw_min = HWP_LOWEST_PERF(cap);
	hw_max = HWP_HIGHEST_PERF(cap);
	range = hw_max - hw_min;
D
Dirk Brandewie 已提交
297 298 299 300 301

	get_online_cpus();

	for_each_online_cpu(cpu) {
		rdmsrl_on_cpu(cpu, MSR_HWP_REQUEST, &value);
302
		adj_range = limits->min_perf_pct * range / 100;
303
		min = hw_min + adj_range;
D
Dirk Brandewie 已提交
304 305 306
		value &= ~HWP_MIN_PERF(~0L);
		value |= HWP_MIN_PERF(min);

307
		adj_range = limits->max_perf_pct * range / 100;
308
		max = hw_min + adj_range;
309
		if (limits->no_turbo) {
310 311 312
			hw_max = HWP_GUARANTEED_PERF(cap);
			if (hw_max < max)
				max = hw_max;
D
Dirk Brandewie 已提交
313 314 315 316 317 318 319 320 321 322
		}

		value &= ~HWP_MAX_PERF(~0L);
		value |= HWP_MAX_PERF(max);
		wrmsrl_on_cpu(cpu, MSR_HWP_REQUEST, value);
	}

	put_online_cpus();
}

323 324 325 326 327 328 329
/************************** debugfs begin ************************/
static int pid_param_set(void *data, u64 val)
{
	*(u32 *)data = val;
	intel_pstate_reset_all_pid();
	return 0;
}
330

331 332 333 334 335
static int pid_param_get(void *data, u64 *val)
{
	*val = *(u32 *)data;
	return 0;
}
336
DEFINE_SIMPLE_ATTRIBUTE(fops_pid_param, pid_param_get, pid_param_set, "%llu\n");
337 338 339 340 341 342 343

struct pid_param {
	char *name;
	void *value;
};

static struct pid_param pid_files[] = {
344 345 346 347 348 349
	{"sample_rate_ms", &pid_params.sample_rate_ms},
	{"d_gain_pct", &pid_params.d_gain_pct},
	{"i_gain_pct", &pid_params.i_gain_pct},
	{"deadband", &pid_params.deadband},
	{"setpoint", &pid_params.setpoint},
	{"p_gain_pct", &pid_params.p_gain_pct},
350 351 352
	{NULL, NULL}
};

353
static void __init intel_pstate_debug_expose_params(void)
354
{
355
	struct dentry *debugfs_parent;
356 357
	int i = 0;

D
Dirk Brandewie 已提交
358 359
	if (hwp_active)
		return;
360 361 362 363 364
	debugfs_parent = debugfs_create_dir("pstate_snb", NULL);
	if (IS_ERR_OR_NULL(debugfs_parent))
		return;
	while (pid_files[i].name) {
		debugfs_create_file(pid_files[i].name, 0660,
365 366
				    debugfs_parent, pid_files[i].value,
				    &fops_pid_param);
367 368 369 370 371 372 373 374 375 376 377
		i++;
	}
}

/************************** debugfs end ************************/

/************************** sysfs begin ************************/
#define show_one(file_name, object)					\
	static ssize_t show_##file_name					\
	(struct kobject *kobj, struct attribute *attr, char *buf)	\
	{								\
378
		return sprintf(buf, "%u\n", limits->object);		\
379 380
	}

381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396
static ssize_t show_turbo_pct(struct kobject *kobj,
				struct attribute *attr, char *buf)
{
	struct cpudata *cpu;
	int total, no_turbo, turbo_pct;
	uint32_t turbo_fp;

	cpu = all_cpu_data[0];

	total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1;
	no_turbo = cpu->pstate.max_pstate - cpu->pstate.min_pstate + 1;
	turbo_fp = div_fp(int_tofp(no_turbo), int_tofp(total));
	turbo_pct = 100 - fp_toint(mul_fp(turbo_fp, int_tofp(100)));
	return sprintf(buf, "%u\n", turbo_pct);
}

397 398 399 400 401 402 403 404 405 406 407
static ssize_t show_num_pstates(struct kobject *kobj,
				struct attribute *attr, char *buf)
{
	struct cpudata *cpu;
	int total;

	cpu = all_cpu_data[0];
	total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1;
	return sprintf(buf, "%u\n", total);
}

408 409 410 411 412 413
static ssize_t show_no_turbo(struct kobject *kobj,
			     struct attribute *attr, char *buf)
{
	ssize_t ret;

	update_turbo_state();
414 415
	if (limits->turbo_disabled)
		ret = sprintf(buf, "%u\n", limits->turbo_disabled);
416
	else
417
		ret = sprintf(buf, "%u\n", limits->no_turbo);
418 419 420 421

	return ret;
}

422
static ssize_t store_no_turbo(struct kobject *a, struct attribute *b,
423
			      const char *buf, size_t count)
424 425 426
{
	unsigned int input;
	int ret;
427

428 429 430
	ret = sscanf(buf, "%u", &input);
	if (ret != 1)
		return -EINVAL;
431 432

	update_turbo_state();
433
	if (limits->turbo_disabled) {
434
		pr_warn("intel_pstate: Turbo disabled by BIOS or unavailable on processor\n");
435
		return -EPERM;
436
	}
D
Dirk Brandewie 已提交
437

438
	limits->no_turbo = clamp_t(int, input, 0, 1);
439

D
Dirk Brandewie 已提交
440 441 442
	if (hwp_active)
		intel_pstate_hwp_set();

443 444 445 446
	return count;
}

static ssize_t store_max_perf_pct(struct kobject *a, struct attribute *b,
447
				  const char *buf, size_t count)
448 449 450
{
	unsigned int input;
	int ret;
451

452 453 454 455
	ret = sscanf(buf, "%u", &input);
	if (ret != 1)
		return -EINVAL;

456 457 458 459 460 461 462 463 464
	limits->max_sysfs_pct = clamp_t(int, input, 0 , 100);
	limits->max_perf_pct = min(limits->max_policy_pct,
				   limits->max_sysfs_pct);
	limits->max_perf_pct = max(limits->min_policy_pct,
				   limits->max_perf_pct);
	limits->max_perf_pct = max(limits->min_perf_pct,
				   limits->max_perf_pct);
	limits->max_perf = div_fp(int_tofp(limits->max_perf_pct),
				  int_tofp(100));
465

D
Dirk Brandewie 已提交
466 467
	if (hwp_active)
		intel_pstate_hwp_set();
468 469 470 471
	return count;
}

static ssize_t store_min_perf_pct(struct kobject *a, struct attribute *b,
472
				  const char *buf, size_t count)
473 474 475
{
	unsigned int input;
	int ret;
476

477 478 479
	ret = sscanf(buf, "%u", &input);
	if (ret != 1)
		return -EINVAL;
480

481 482 483 484 485 486 487 488 489
	limits->min_sysfs_pct = clamp_t(int, input, 0 , 100);
	limits->min_perf_pct = max(limits->min_policy_pct,
				   limits->min_sysfs_pct);
	limits->min_perf_pct = min(limits->max_policy_pct,
				   limits->min_perf_pct);
	limits->min_perf_pct = min(limits->max_perf_pct,
				   limits->min_perf_pct);
	limits->min_perf = div_fp(int_tofp(limits->min_perf_pct),
				  int_tofp(100));
490

D
Dirk Brandewie 已提交
491 492
	if (hwp_active)
		intel_pstate_hwp_set();
493 494 495 496 497 498 499 500 501
	return count;
}

show_one(max_perf_pct, max_perf_pct);
show_one(min_perf_pct, min_perf_pct);

define_one_global_rw(no_turbo);
define_one_global_rw(max_perf_pct);
define_one_global_rw(min_perf_pct);
502
define_one_global_ro(turbo_pct);
503
define_one_global_ro(num_pstates);
504 505 506 507 508

static struct attribute *intel_pstate_attributes[] = {
	&no_turbo.attr,
	&max_perf_pct.attr,
	&min_perf_pct.attr,
509
	&turbo_pct.attr,
510
	&num_pstates.attr,
511 512 513 514 515 516 517
	NULL
};

static struct attribute_group intel_pstate_attr_group = {
	.attrs = intel_pstate_attributes,
};

518
static void __init intel_pstate_sysfs_expose_params(void)
519
{
520
	struct kobject *intel_pstate_kobject;
521 522 523 524 525
	int rc;

	intel_pstate_kobject = kobject_create_and_add("intel_pstate",
						&cpu_subsys.dev_root->kobj);
	BUG_ON(!intel_pstate_kobject);
526
	rc = sysfs_create_group(intel_pstate_kobject, &intel_pstate_attr_group);
527 528 529
	BUG_ON(rc);
}
/************************** sysfs end ************************/
D
Dirk Brandewie 已提交
530

531
static void intel_pstate_hwp_enable(struct cpudata *cpudata)
D
Dirk Brandewie 已提交
532
{
533
	wrmsrl_on_cpu(cpudata->cpu, MSR_PM_ENABLE, 0x1);
D
Dirk Brandewie 已提交
534 535
}

536
static int atom_get_min_pstate(void)
537 538
{
	u64 value;
539

540
	rdmsrl(ATOM_RATIOS, value);
D
Dirk Brandewie 已提交
541
	return (value >> 8) & 0x7F;
542 543
}

544
static int atom_get_max_pstate(void)
545 546
{
	u64 value;
547

548
	rdmsrl(ATOM_RATIOS, value);
D
Dirk Brandewie 已提交
549
	return (value >> 16) & 0x7F;
550
}
551

552
static int atom_get_turbo_pstate(void)
553 554
{
	u64 value;
555

556
	rdmsrl(ATOM_TURBO_RATIOS, value);
D
Dirk Brandewie 已提交
557
	return value & 0x7F;
558 559
}

560
static void atom_set_pstate(struct cpudata *cpudata, int pstate)
561 562 563 564 565
{
	u64 val;
	int32_t vid_fp;
	u32 vid;

566
	val = (u64)pstate << 8;
567
	if (limits->no_turbo && !limits->turbo_disabled)
568 569 570 571 572 573 574
		val |= (u64)1 << 32;

	vid_fp = cpudata->vid.min + mul_fp(
		int_tofp(pstate - cpudata->pstate.min_pstate),
		cpudata->vid.ratio);

	vid_fp = clamp_t(int32_t, vid_fp, cpudata->vid.min, cpudata->vid.max);
575
	vid = ceiling_fp(vid_fp);
576

577 578 579
	if (pstate > cpudata->pstate.max_pstate)
		vid = cpudata->vid.turbo;

580 581
	val |= vid;

582
	wrmsrl_on_cpu(cpudata->cpu, MSR_IA32_PERF_CTL, val);
583 584
}

585
static int silvermont_get_scaling(void)
586 587 588
{
	u64 value;
	int i;
589 590 591
	/* Defined in Table 35-6 from SDM (Sept 2015) */
	static int silvermont_freq_table[] = {
		83300, 100000, 133300, 116700, 80000};
592 593

	rdmsrl(MSR_FSB_FREQ, value);
594 595
	i = value & 0x7;
	WARN_ON(i > 4);
596

597 598
	return silvermont_freq_table[i];
}
599

600 601 602 603 604 605 606 607 608 609 610 611 612 613
static int airmont_get_scaling(void)
{
	u64 value;
	int i;
	/* Defined in Table 35-10 from SDM (Sept 2015) */
	static int airmont_freq_table[] = {
		83300, 100000, 133300, 116700, 80000,
		93300, 90000, 88900, 87500};

	rdmsrl(MSR_FSB_FREQ, value);
	i = value & 0xF;
	WARN_ON(i > 8);

	return airmont_freq_table[i];
614 615
}

616
static void atom_get_vid(struct cpudata *cpudata)
617 618 619
{
	u64 value;

620
	rdmsrl(ATOM_VIDS, value);
D
Dirk Brandewie 已提交
621 622
	cpudata->vid.min = int_tofp((value >> 8) & 0x7f);
	cpudata->vid.max = int_tofp((value >> 16) & 0x7f);
623 624 625 626
	cpudata->vid.ratio = div_fp(
		cpudata->vid.max - cpudata->vid.min,
		int_tofp(cpudata->pstate.max_pstate -
			cpudata->pstate.min_pstate));
627

628
	rdmsrl(ATOM_TURBO_VIDS, value);
629
	cpudata->vid.turbo = value & 0x7f;
630 631
}

632
static int core_get_min_pstate(void)
633 634
{
	u64 value;
635

636
	rdmsrl(MSR_PLATFORM_INFO, value);
637 638 639
	return (value >> 40) & 0xFF;
}

640
static int core_get_max_pstate_physical(void)
641 642
{
	u64 value;
643

644
	rdmsrl(MSR_PLATFORM_INFO, value);
645 646 647
	return (value >> 8) & 0xFF;
}

648
static int core_get_max_pstate(void)
649
{
650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682
	u64 tar;
	u64 plat_info;
	int max_pstate;
	int err;

	rdmsrl(MSR_PLATFORM_INFO, plat_info);
	max_pstate = (plat_info >> 8) & 0xFF;

	err = rdmsrl_safe(MSR_TURBO_ACTIVATION_RATIO, &tar);
	if (!err) {
		/* Do some sanity checking for safety */
		if (plat_info & 0x600000000) {
			u64 tdp_ctrl;
			u64 tdp_ratio;
			int tdp_msr;

			err = rdmsrl_safe(MSR_CONFIG_TDP_CONTROL, &tdp_ctrl);
			if (err)
				goto skip_tar;

			tdp_msr = MSR_CONFIG_TDP_NOMINAL + tdp_ctrl;
			err = rdmsrl_safe(tdp_msr, &tdp_ratio);
			if (err)
				goto skip_tar;

			if (tdp_ratio - 1 == tar) {
				max_pstate = tar;
				pr_debug("max_pstate=TAC %x\n", max_pstate);
			} else {
				goto skip_tar;
			}
		}
	}
683

684 685
skip_tar:
	return max_pstate;
686 687
}

688
static int core_get_turbo_pstate(void)
689 690 691
{
	u64 value;
	int nont, ret;
692

693
	rdmsrl(MSR_NHM_TURBO_RATIO_LIMIT, value);
694
	nont = core_get_max_pstate();
695
	ret = (value) & 255;
696 697 698 699 700
	if (ret <= nont)
		ret = nont;
	return ret;
}

701 702 703 704 705
static inline int core_get_scaling(void)
{
	return 100000;
}

706
static void core_set_pstate(struct cpudata *cpudata, int pstate)
707 708 709
{
	u64 val;

710
	val = (u64)pstate << 8;
711
	if (limits->no_turbo && !limits->turbo_disabled)
712 713
		val |= (u64)1 << 32;

714
	wrmsrl_on_cpu(cpudata->cpu, MSR_IA32_PERF_CTL, val);
715 716
}

717 718 719 720 721 722 723 724 725 726 727 728 729
static int knl_get_turbo_pstate(void)
{
	u64 value;
	int nont, ret;

	rdmsrl(MSR_NHM_TURBO_RATIO_LIMIT, value);
	nont = core_get_max_pstate();
	ret = (((value) >> 8) & 0xFF);
	if (ret <= nont)
		ret = nont;
	return ret;
}

730 731 732 733 734 735 736 737 738 739 740
static struct cpu_defaults core_params = {
	.pid_policy = {
		.sample_rate_ms = 10,
		.deadband = 0,
		.setpoint = 97,
		.p_gain_pct = 20,
		.d_gain_pct = 0,
		.i_gain_pct = 0,
	},
	.funcs = {
		.get_max = core_get_max_pstate,
741
		.get_max_physical = core_get_max_pstate_physical,
742 743
		.get_min = core_get_min_pstate,
		.get_turbo = core_get_turbo_pstate,
744
		.get_scaling = core_get_scaling,
745
		.set = core_set_pstate,
746
		.get_target_pstate = get_target_pstate_use_performance,
747 748 749
	},
};

750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766
static struct cpu_defaults silvermont_params = {
	.pid_policy = {
		.sample_rate_ms = 10,
		.deadband = 0,
		.setpoint = 60,
		.p_gain_pct = 14,
		.d_gain_pct = 0,
		.i_gain_pct = 4,
	},
	.funcs = {
		.get_max = atom_get_max_pstate,
		.get_max_physical = atom_get_max_pstate,
		.get_min = atom_get_min_pstate,
		.get_turbo = atom_get_turbo_pstate,
		.set = atom_set_pstate,
		.get_scaling = silvermont_get_scaling,
		.get_vid = atom_get_vid,
767
		.get_target_pstate = get_target_pstate_use_cpu_load,
768 769 770 771
	},
};

static struct cpu_defaults airmont_params = {
772 773 774
	.pid_policy = {
		.sample_rate_ms = 10,
		.deadband = 0,
775
		.setpoint = 60,
776 777 778 779 780
		.p_gain_pct = 14,
		.d_gain_pct = 0,
		.i_gain_pct = 4,
	},
	.funcs = {
781 782 783 784 785
		.get_max = atom_get_max_pstate,
		.get_max_physical = atom_get_max_pstate,
		.get_min = atom_get_min_pstate,
		.get_turbo = atom_get_turbo_pstate,
		.set = atom_set_pstate,
786
		.get_scaling = airmont_get_scaling,
787
		.get_vid = atom_get_vid,
788
		.get_target_pstate = get_target_pstate_use_cpu_load,
789 790 791
	},
};

792 793 794 795 796 797 798 799 800 801 802
static struct cpu_defaults knl_params = {
	.pid_policy = {
		.sample_rate_ms = 10,
		.deadband = 0,
		.setpoint = 97,
		.p_gain_pct = 20,
		.d_gain_pct = 0,
		.i_gain_pct = 0,
	},
	.funcs = {
		.get_max = core_get_max_pstate,
803
		.get_max_physical = core_get_max_pstate_physical,
804 805
		.get_min = core_get_min_pstate,
		.get_turbo = knl_get_turbo_pstate,
806
		.get_scaling = core_get_scaling,
807
		.set = core_set_pstate,
808
		.get_target_pstate = get_target_pstate_use_performance,
809 810 811
	},
};

812 813 814
static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max)
{
	int max_perf = cpu->pstate.turbo_pstate;
815
	int max_perf_adj;
816
	int min_perf;
817

818
	if (limits->no_turbo || limits->turbo_disabled)
819 820
		max_perf = cpu->pstate.max_pstate;

821 822 823 824 825
	/*
	 * performance can be limited by user through sysfs, by cpufreq
	 * policy, or by cpu specific default values determined through
	 * experimentation.
	 */
826 827 828
	max_perf_adj = fp_toint(mul_fp(int_tofp(max_perf), limits->max_perf));
	*max = clamp_t(int, max_perf_adj,
			cpu->pstate.min_pstate, cpu->pstate.turbo_pstate);
829

830 831
	min_perf = fp_toint(mul_fp(int_tofp(max_perf), limits->min_perf));
	*min = clamp_t(int, min_perf, cpu->pstate.min_pstate, max_perf);
832 833
}

834
static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate, bool force)
835 836 837
{
	int max_perf, min_perf;

838 839
	if (force) {
		update_turbo_state();
840

841
		intel_pstate_get_min_max(cpu, &min_perf, &max_perf);
842

843
		pstate = clamp_t(int, pstate, min_perf, max_perf);
844

845 846 847
		if (pstate == cpu->pstate.current_pstate)
			return;
	}
848
	trace_cpu_frequency(pstate * cpu->pstate.scaling, cpu->cpu);
849

850 851
	cpu->pstate.current_pstate = pstate;

852
	pstate_funcs.set(cpu, pstate);
853 854 855 856
}

static void intel_pstate_get_cpu_pstates(struct cpudata *cpu)
{
857 858
	cpu->pstate.min_pstate = pstate_funcs.get_min();
	cpu->pstate.max_pstate = pstate_funcs.get_max();
859
	cpu->pstate.max_pstate_physical = pstate_funcs.get_max_physical();
860
	cpu->pstate.turbo_pstate = pstate_funcs.get_turbo();
861
	cpu->pstate.scaling = pstate_funcs.get_scaling();
862

863 864
	if (pstate_funcs.get_vid)
		pstate_funcs.get_vid(cpu);
865
	intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate, false);
866 867
}

868
static inline void intel_pstate_calc_busy(struct cpudata *cpu)
869
{
870
	struct sample *sample = &cpu->sample;
871
	int64_t core_pct;
872

873
	core_pct = int_tofp(sample->aperf) * int_tofp(100);
874
	core_pct = div64_u64(core_pct, int_tofp(sample->mperf));
875

876
	sample->freq = fp_toint(
877
		mul_fp(int_tofp(
878 879
			cpu->pstate.max_pstate_physical *
			cpu->pstate.scaling / 100),
880
			core_pct));
881

882
	sample->core_pct_busy = (int32_t)core_pct;
883 884 885 886 887
}

static inline void intel_pstate_sample(struct cpudata *cpu)
{
	u64 aperf, mperf;
888
	unsigned long flags;
889
	u64 tsc;
890

891
	local_irq_save(flags);
892 893
	rdmsrl(MSR_IA32_APERF, aperf);
	rdmsrl(MSR_IA32_MPERF, mperf);
894 895
	tsc = rdtsc();
	if ((cpu->prev_mperf == mperf) || (cpu->prev_tsc == tsc)) {
896 897 898
		local_irq_restore(flags);
		return;
	}
899
	local_irq_restore(flags);
900

901 902
	cpu->last_sample_time = cpu->sample.time;
	cpu->sample.time = ktime_get();
903 904
	cpu->sample.aperf = aperf;
	cpu->sample.mperf = mperf;
905
	cpu->sample.tsc =  tsc;
906 907
	cpu->sample.aperf -= cpu->prev_aperf;
	cpu->sample.mperf -= cpu->prev_mperf;
908
	cpu->sample.tsc -= cpu->prev_tsc;
909

910
	intel_pstate_calc_busy(cpu);
911 912 913

	cpu->prev_aperf = aperf;
	cpu->prev_mperf = mperf;
914
	cpu->prev_tsc = tsc;
915 916
}

D
Dirk Brandewie 已提交
917 918 919 920 921 922 923 924
static inline void intel_hwp_set_sample_time(struct cpudata *cpu)
{
	int delay;

	delay = msecs_to_jiffies(50);
	mod_timer_pinned(&cpu->timer, jiffies + delay);
}

925 926
static inline void intel_pstate_set_sample_time(struct cpudata *cpu)
{
927
	int delay;
928

929
	delay = msecs_to_jiffies(pid_params.sample_rate_ms);
930 931 932
	mod_timer_pinned(&cpu->timer, jiffies + delay);
}

933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951
static inline int32_t get_target_pstate_use_cpu_load(struct cpudata *cpu)
{
	struct sample *sample = &cpu->sample;
	int32_t cpu_load;

	/*
	 * The load can be estimated as the ratio of the mperf counter
	 * running at a constant frequency during active periods
	 * (C0) and the time stamp counter running at the same frequency
	 * also during C-states.
	 */
	cpu_load = div64_u64(int_tofp(100) * sample->mperf, sample->tsc);

	cpu->sample.busy_scaled = cpu_load;

	return cpu->pstate.current_pstate - pid_calc(&cpu->pid, cpu_load);
}


952
static inline int32_t get_target_pstate_use_performance(struct cpudata *cpu)
953
{
954
	int32_t core_busy, max_pstate, current_pstate, sample_ratio;
955
	s64 duration_us;
956
	u32 sample_time;
957

958 959 960 961 962 963 964 965 966 967 968
	/*
	 * core_busy is the ratio of actual performance to max
	 * max_pstate is the max non turbo pstate available
	 * current_pstate was the pstate that was requested during
	 * 	the last sample period.
	 *
	 * We normalize core_busy, which was our actual percent
	 * performance to what we requested during the last sample
	 * period. The result will be a percentage of busy at a
	 * specified pstate.
	 */
969
	core_busy = cpu->sample.core_pct_busy;
970
	max_pstate = int_tofp(cpu->pstate.max_pstate_physical);
971
	current_pstate = int_tofp(cpu->pstate.current_pstate);
972
	core_busy = mul_fp(core_busy, div_fp(max_pstate, current_pstate));
973

974 975 976 977 978 979 980
	/*
	 * Since we have a deferred timer, it will not fire unless
	 * we are in C0.  So, determine if the actual elapsed time
	 * is significantly greater (3x) than our sample interval.  If it
	 * is, then we were idle for a long enough period of time
	 * to adjust our busyness.
	 */
981
	sample_time = pid_params.sample_rate_ms  * USEC_PER_MSEC;
982 983
	duration_us = ktime_us_delta(cpu->sample.time,
				     cpu->last_sample_time);
984 985
	if (duration_us > sample_time * 3) {
		sample_ratio = div_fp(int_tofp(sample_time),
986
				      int_tofp(duration_us));
987 988 989
		core_busy = mul_fp(core_busy, sample_ratio);
	}

990 991
	cpu->sample.busy_scaled = core_busy;
	return cpu->pstate.current_pstate - pid_calc(&cpu->pid, core_busy);
992 993 994 995
}

static inline void intel_pstate_adjust_busy_pstate(struct cpudata *cpu)
{
996
	int from, target_pstate;
997 998 999
	struct sample *sample;

	from = cpu->pstate.current_pstate;
1000

1001
	target_pstate = pstate_funcs.get_target_pstate(cpu);
1002

1003
	intel_pstate_set_pstate(cpu, target_pstate, true);
1004 1005 1006

	sample = &cpu->sample;
	trace_pstate_sample(fp_toint(sample->core_pct_busy),
1007
		fp_toint(sample->busy_scaled),
1008 1009 1010 1011 1012 1013
		from,
		cpu->pstate.current_pstate,
		sample->mperf,
		sample->aperf,
		sample->tsc,
		sample->freq);
1014 1015
}

D
Dirk Brandewie 已提交
1016 1017 1018 1019 1020 1021 1022 1023
static void intel_hwp_timer_func(unsigned long __data)
{
	struct cpudata *cpu = (struct cpudata *) __data;

	intel_pstate_sample(cpu);
	intel_hwp_set_sample_time(cpu);
}

1024 1025 1026 1027 1028
static void intel_pstate_timer_func(unsigned long __data)
{
	struct cpudata *cpu = (struct cpudata *) __data;

	intel_pstate_sample(cpu);
1029

1030
	intel_pstate_adjust_busy_pstate(cpu);
1031

1032 1033 1034 1035
	intel_pstate_set_sample_time(cpu);
}

#define ICPU(model, policy) \
1036 1037
	{ X86_VENDOR_INTEL, 6, model, X86_FEATURE_APERFMPERF,\
			(unsigned long)&policy }
1038 1039

static const struct x86_cpu_id intel_pstate_cpu_ids[] = {
1040 1041
	ICPU(0x2a, core_params),
	ICPU(0x2d, core_params),
1042
	ICPU(0x37, silvermont_params),
1043 1044
	ICPU(0x3a, core_params),
	ICPU(0x3c, core_params),
1045
	ICPU(0x3d, core_params),
1046 1047 1048 1049
	ICPU(0x3e, core_params),
	ICPU(0x3f, core_params),
	ICPU(0x45, core_params),
	ICPU(0x46, core_params),
1050
	ICPU(0x47, core_params),
1051
	ICPU(0x4c, airmont_params),
1052
	ICPU(0x4e, core_params),
1053
	ICPU(0x4f, core_params),
1054
	ICPU(0x5e, core_params),
1055
	ICPU(0x56, core_params),
1056
	ICPU(0x57, knl_params),
1057 1058 1059 1060
	{}
};
MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids);

D
Dirk Brandewie 已提交
1061 1062 1063 1064 1065
static const struct x86_cpu_id intel_pstate_cpu_oob_ids[] = {
	ICPU(0x56, core_params),
	{}
};

1066 1067 1068 1069
static int intel_pstate_init_cpu(unsigned int cpunum)
{
	struct cpudata *cpu;

1070 1071 1072
	if (!all_cpu_data[cpunum])
		all_cpu_data[cpunum] = kzalloc(sizeof(struct cpudata),
					       GFP_KERNEL);
1073 1074 1075 1076 1077 1078
	if (!all_cpu_data[cpunum])
		return -ENOMEM;

	cpu = all_cpu_data[cpunum];

	cpu->cpu = cpunum;
1079 1080 1081 1082

	if (hwp_active)
		intel_pstate_hwp_enable(cpu);

1083
	intel_pstate_get_cpu_pstates(cpu);
1084

1085
	init_timer_deferrable(&cpu->timer);
1086
	cpu->timer.data = (unsigned long)cpu;
1087
	cpu->timer.expires = jiffies + HZ/100;
D
Dirk Brandewie 已提交
1088 1089 1090 1091 1092 1093

	if (!hwp_active)
		cpu->timer.function = intel_pstate_timer_func;
	else
		cpu->timer.function = intel_hwp_timer_func;

1094 1095 1096 1097 1098
	intel_pstate_busy_pid_reset(cpu);
	intel_pstate_sample(cpu);

	add_timer_on(&cpu->timer, cpunum);

1099
	pr_debug("intel_pstate: controlling: cpu %d\n", cpunum);
1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111

	return 0;
}

static unsigned int intel_pstate_get(unsigned int cpu_num)
{
	struct sample *sample;
	struct cpudata *cpu;

	cpu = all_cpu_data[cpu_num];
	if (!cpu)
		return 0;
1112
	sample = &cpu->sample;
1113 1114 1115 1116 1117
	return sample->freq;
}

static int intel_pstate_set_policy(struct cpufreq_policy *policy)
{
1118 1119 1120
	if (!policy->cpuinfo.max_freq)
		return -ENODEV;

1121 1122
	if (policy->policy == CPUFREQ_POLICY_PERFORMANCE &&
	    policy->max >= policy->cpuinfo.max_freq) {
1123 1124
		pr_debug("intel_pstate: set performance\n");
		limits = &performance_limits;
1125 1126
		if (hwp_active)
			intel_pstate_hwp_set();
1127
		return 0;
1128
	}
D
Dirk Brandewie 已提交
1129

1130 1131 1132 1133
	pr_debug("intel_pstate: set powersave\n");
	limits = &powersave_limits;
	limits->min_policy_pct = (policy->min * 100) / policy->cpuinfo.max_freq;
	limits->min_policy_pct = clamp_t(int, limits->min_policy_pct, 0 , 100);
1134 1135
	limits->max_policy_pct = DIV_ROUND_UP(policy->max * 100,
					      policy->cpuinfo.max_freq);
1136
	limits->max_policy_pct = clamp_t(int, limits->max_policy_pct, 0 , 100);
1137 1138

	/* Normalize user input to [min_policy_pct, max_policy_pct] */
1139 1140 1141 1142 1143 1144 1145 1146
	limits->min_perf_pct = max(limits->min_policy_pct,
				   limits->min_sysfs_pct);
	limits->min_perf_pct = min(limits->max_policy_pct,
				   limits->min_perf_pct);
	limits->max_perf_pct = min(limits->max_policy_pct,
				   limits->max_sysfs_pct);
	limits->max_perf_pct = max(limits->min_policy_pct,
				   limits->max_perf_pct);
1147
	limits->max_perf = round_up(limits->max_perf, 8);
1148 1149

	/* Make sure min_perf_pct <= max_perf_pct */
1150
	limits->min_perf_pct = min(limits->max_perf_pct, limits->min_perf_pct);
1151

1152 1153 1154 1155
	limits->min_perf = div_fp(int_tofp(limits->min_perf_pct),
				  int_tofp(100));
	limits->max_perf = div_fp(int_tofp(limits->max_perf_pct),
				  int_tofp(100));
1156

D
Dirk Brandewie 已提交
1157 1158 1159
	if (hwp_active)
		intel_pstate_hwp_set();

1160 1161 1162 1163 1164
	return 0;
}

static int intel_pstate_verify_policy(struct cpufreq_policy *policy)
{
1165
	cpufreq_verify_within_cpu_limits(policy);
1166

1167
	if (policy->policy != CPUFREQ_POLICY_POWERSAVE &&
1168
	    policy->policy != CPUFREQ_POLICY_PERFORMANCE)
1169 1170 1171 1172 1173
		return -EINVAL;

	return 0;
}

1174
static void intel_pstate_stop_cpu(struct cpufreq_policy *policy)
1175
{
1176 1177
	int cpu_num = policy->cpu;
	struct cpudata *cpu = all_cpu_data[cpu_num];
1178

1179
	pr_debug("intel_pstate: CPU %d exiting\n", cpu_num);
1180

1181
	del_timer_sync(&all_cpu_data[cpu_num]->timer);
D
Dirk Brandewie 已提交
1182 1183 1184
	if (hwp_active)
		return;

1185
	intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate, false);
1186 1187
}

1188
static int intel_pstate_cpu_init(struct cpufreq_policy *policy)
1189 1190
{
	struct cpudata *cpu;
1191
	int rc;
1192 1193 1194 1195 1196 1197 1198

	rc = intel_pstate_init_cpu(policy->cpu);
	if (rc)
		return rc;

	cpu = all_cpu_data[policy->cpu];

1199
	if (limits->min_perf_pct == 100 && limits->max_perf_pct == 100)
1200 1201 1202 1203
		policy->policy = CPUFREQ_POLICY_PERFORMANCE;
	else
		policy->policy = CPUFREQ_POLICY_POWERSAVE;

1204 1205
	policy->min = cpu->pstate.min_pstate * cpu->pstate.scaling;
	policy->max = cpu->pstate.turbo_pstate * cpu->pstate.scaling;
1206 1207

	/* cpuinfo and default policy values */
1208 1209 1210
	policy->cpuinfo.min_freq = cpu->pstate.min_pstate * cpu->pstate.scaling;
	policy->cpuinfo.max_freq =
		cpu->pstate.turbo_pstate * cpu->pstate.scaling;
1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222
	policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
	cpumask_set_cpu(policy->cpu, policy->cpus);

	return 0;
}

static struct cpufreq_driver intel_pstate_driver = {
	.flags		= CPUFREQ_CONST_LOOPS,
	.verify		= intel_pstate_verify_policy,
	.setpolicy	= intel_pstate_set_policy,
	.get		= intel_pstate_get,
	.init		= intel_pstate_cpu_init,
1223
	.stop_cpu	= intel_pstate_stop_cpu,
1224 1225 1226
	.name		= "intel_pstate",
};

1227
static int __initdata no_load;
D
Dirk Brandewie 已提交
1228
static int __initdata no_hwp;
1229
static int __initdata hwp_only;
1230
static unsigned int force_load;
1231

1232 1233
static int intel_pstate_msrs_not_valid(void)
{
1234
	if (!pstate_funcs.get_max() ||
1235 1236
	    !pstate_funcs.get_min() ||
	    !pstate_funcs.get_turbo())
1237 1238 1239 1240
		return -ENODEV;

	return 0;
}
1241

1242
static void copy_pid_params(struct pstate_adjust_policy *policy)
1243 1244 1245 1246 1247 1248 1249 1250 1251
{
	pid_params.sample_rate_ms = policy->sample_rate_ms;
	pid_params.p_gain_pct = policy->p_gain_pct;
	pid_params.i_gain_pct = policy->i_gain_pct;
	pid_params.d_gain_pct = policy->d_gain_pct;
	pid_params.deadband = policy->deadband;
	pid_params.setpoint = policy->setpoint;
}

1252
static void copy_cpu_funcs(struct pstate_funcs *funcs)
1253 1254
{
	pstate_funcs.get_max   = funcs->get_max;
1255
	pstate_funcs.get_max_physical = funcs->get_max_physical;
1256 1257
	pstate_funcs.get_min   = funcs->get_min;
	pstate_funcs.get_turbo = funcs->get_turbo;
1258
	pstate_funcs.get_scaling = funcs->get_scaling;
1259
	pstate_funcs.set       = funcs->set;
1260
	pstate_funcs.get_vid   = funcs->get_vid;
1261 1262
	pstate_funcs.get_target_pstate = funcs->get_target_pstate;

1263 1264
}

1265
#if IS_ENABLED(CONFIG_ACPI)
1266
#include <acpi/processor.h>
1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296

static bool intel_pstate_no_acpi_pss(void)
{
	int i;

	for_each_possible_cpu(i) {
		acpi_status status;
		union acpi_object *pss;
		struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
		struct acpi_processor *pr = per_cpu(processors, i);

		if (!pr)
			continue;

		status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
		if (ACPI_FAILURE(status))
			continue;

		pss = buffer.pointer;
		if (pss && pss->type == ACPI_TYPE_PACKAGE) {
			kfree(pss);
			return false;
		}

		kfree(pss);
	}

	return true;
}

1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316
static bool intel_pstate_has_acpi_ppc(void)
{
	int i;

	for_each_possible_cpu(i) {
		struct acpi_processor *pr = per_cpu(processors, i);

		if (!pr)
			continue;
		if (acpi_has_method(pr->handle, "_PPC"))
			return true;
	}
	return false;
}

enum {
	PSS,
	PPC,
};

1317 1318 1319 1320
struct hw_vendor_info {
	u16  valid;
	char oem_id[ACPI_OEM_ID_SIZE];
	char oem_table_id[ACPI_OEM_TABLE_ID_SIZE];
1321
	int  oem_pwr_table;
1322 1323 1324 1325
};

/* Hardware vendor-specific info that has its own power management modes */
static struct hw_vendor_info vendor_info[] = {
1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336
	{1, "HP    ", "ProLiant", PSS},
	{1, "ORACLE", "X4-2    ", PPC},
	{1, "ORACLE", "X4-2L   ", PPC},
	{1, "ORACLE", "X4-2B   ", PPC},
	{1, "ORACLE", "X3-2    ", PPC},
	{1, "ORACLE", "X3-2L   ", PPC},
	{1, "ORACLE", "X3-2B   ", PPC},
	{1, "ORACLE", "X4470M2 ", PPC},
	{1, "ORACLE", "X4270M3 ", PPC},
	{1, "ORACLE", "X4270M2 ", PPC},
	{1, "ORACLE", "X4170M2 ", PPC},
1337 1338 1339 1340
	{1, "ORACLE", "X4170 M3", PPC},
	{1, "ORACLE", "X4275 M3", PPC},
	{1, "ORACLE", "X6-2    ", PPC},
	{1, "ORACLE", "Sudbury ", PPC},
1341 1342 1343 1344 1345 1346 1347
	{0, "", ""},
};

static bool intel_pstate_platform_pwr_mgmt_exists(void)
{
	struct acpi_table_header hdr;
	struct hw_vendor_info *v_info;
D
Dirk Brandewie 已提交
1348 1349 1350 1351 1352 1353 1354 1355 1356
	const struct x86_cpu_id *id;
	u64 misc_pwr;

	id = x86_match_cpu(intel_pstate_cpu_oob_ids);
	if (id) {
		rdmsrl(MSR_MISC_PWR_MGMT, misc_pwr);
		if ( misc_pwr & (1 << 8))
			return true;
	}
1357

1358 1359
	if (acpi_disabled ||
	    ACPI_FAILURE(acpi_get_table_header(ACPI_SIG_FADT, 0, &hdr)))
1360 1361 1362
		return false;

	for (v_info = vendor_info; v_info->valid; v_info++) {
1363
		if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE) &&
1364 1365 1366 1367 1368 1369
			!strncmp(hdr.oem_table_id, v_info->oem_table_id,
						ACPI_OEM_TABLE_ID_SIZE))
			switch (v_info->oem_pwr_table) {
			case PSS:
				return intel_pstate_no_acpi_pss();
			case PPC:
1370 1371
				return intel_pstate_has_acpi_ppc() &&
					(!force_load);
1372
			}
1373 1374 1375 1376 1377 1378
	}

	return false;
}
#else /* CONFIG_ACPI not enabled */
static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; }
1379
static inline bool intel_pstate_has_acpi_ppc(void) { return false; }
1380 1381
#endif /* CONFIG_ACPI */

1382 1383
static int __init intel_pstate_init(void)
{
1384
	int cpu, rc = 0;
1385
	const struct x86_cpu_id *id;
1386
	struct cpu_defaults *cpu_def;
1387

1388 1389 1390
	if (no_load)
		return -ENODEV;

1391 1392 1393 1394
	id = x86_match_cpu(intel_pstate_cpu_ids);
	if (!id)
		return -ENODEV;

1395 1396 1397 1398 1399 1400 1401
	/*
	 * The Intel pstate driver will be ignored if the platform
	 * firmware has its own power management modes.
	 */
	if (intel_pstate_platform_pwr_mgmt_exists())
		return -ENODEV;

1402
	cpu_def = (struct cpu_defaults *)id->driver_data;
1403

1404 1405
	copy_pid_params(&cpu_def->pid_policy);
	copy_cpu_funcs(&cpu_def->funcs);
1406

1407 1408 1409
	if (intel_pstate_msrs_not_valid())
		return -ENODEV;

1410 1411
	pr_info("Intel P-state driver initializing.\n");

1412
	all_cpu_data = vzalloc(sizeof(void *) * num_possible_cpus());
1413 1414 1415
	if (!all_cpu_data)
		return -ENOMEM;

1416 1417
	if (static_cpu_has_safe(X86_FEATURE_HWP) && !no_hwp) {
		pr_info("intel_pstate: HWP enabled\n");
1418
		hwp_active++;
1419
	}
D
Dirk Brandewie 已提交
1420

1421 1422 1423
	if (!hwp_active && hwp_only)
		goto out;

1424 1425 1426 1427 1428 1429
	rc = cpufreq_register_driver(&intel_pstate_driver);
	if (rc)
		goto out;

	intel_pstate_debug_expose_params();
	intel_pstate_sysfs_expose_params();
1430

1431 1432
	return rc;
out:
1433 1434 1435 1436 1437 1438 1439 1440 1441 1442
	get_online_cpus();
	for_each_online_cpu(cpu) {
		if (all_cpu_data[cpu]) {
			del_timer_sync(&all_cpu_data[cpu]->timer);
			kfree(all_cpu_data[cpu]);
		}
	}

	put_online_cpus();
	vfree(all_cpu_data);
1443 1444 1445 1446
	return -ENODEV;
}
device_initcall(intel_pstate_init);

1447 1448 1449 1450 1451 1452 1453
static int __init intel_pstate_setup(char *str)
{
	if (!str)
		return -EINVAL;

	if (!strcmp(str, "disable"))
		no_load = 1;
1454 1455
	if (!strcmp(str, "no_hwp")) {
		pr_info("intel_pstate: HWP disabled\n");
D
Dirk Brandewie 已提交
1456
		no_hwp = 1;
1457
	}
1458 1459
	if (!strcmp(str, "force"))
		force_load = 1;
1460 1461
	if (!strcmp(str, "hwp_only"))
		hwp_only = 1;
1462 1463 1464 1465
	return 0;
}
early_param("intel_pstate", intel_pstate_setup);

1466 1467 1468
MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@intel.com>");
MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors");
MODULE_LICENSE("GPL");