2 * intel_pstate.c: Native P state management for Intel processors
4 * (C) Copyright 2012 Intel Corporation
5 * Author: Dirk Brandewie <dirk.j.brandewie@intel.com>
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
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>
27 #include <linux/debugfs.h>
28 #include <linux/acpi.h>
29 #include <trace/events/power.h>
31 #include <asm/div64.h>
33 #include <asm/cpu_device_id.h>
35 #define BYT_RATIOS 0x66a
36 #define BYT_VIDS 0x66b
37 #define BYT_TURBO_RATIOS 0x66c
38 #define BYT_TURBO_VIDS 0x66d
41 #define int_tofp(X) ((int64_t)(X) << FRAC_BITS)
42 #define fp_toint(X) ((X) >> FRAC_BITS)
45 static inline int32_t mul_fp(int32_t x
, int32_t y
)
47 return ((int64_t)x
* (int64_t)y
) >> FRAC_BITS
;
50 static inline int32_t div_fp(int32_t x
, int32_t y
)
52 return div_s64((int64_t)x
<< FRAC_BITS
, y
);
55 static inline int ceiling_fp(int32_t x
)
60 mask
= (1 << FRAC_BITS
) - 1;
67 int32_t core_pct_busy
;
102 struct timer_list timer
;
104 struct pstate_data pstate
;
108 ktime_t last_sample_time
;
111 struct sample sample
;
114 static struct cpudata
**all_cpu_data
;
115 struct pstate_adjust_policy
{
124 struct pstate_funcs
{
125 int (*get_max
)(void);
126 int (*get_min
)(void);
127 int (*get_turbo
)(void);
128 int (*get_scaling
)(void);
129 void (*set
)(struct cpudata
*, int pstate
);
130 void (*get_vid
)(struct cpudata
*);
133 struct cpu_defaults
{
134 struct pstate_adjust_policy pid_policy
;
135 struct pstate_funcs funcs
;
138 static struct pstate_adjust_policy pid_params
;
139 static struct pstate_funcs pstate_funcs
;
152 static struct perf_limits limits
= {
156 .max_perf
= int_tofp(1),
159 .max_policy_pct
= 100,
160 .max_sysfs_pct
= 100,
163 static inline void pid_reset(struct _pid
*pid
, int setpoint
, int busy
,
164 int deadband
, int integral
) {
165 pid
->setpoint
= setpoint
;
166 pid
->deadband
= deadband
;
167 pid
->integral
= int_tofp(integral
);
168 pid
->last_err
= int_tofp(setpoint
) - int_tofp(busy
);
171 static inline void pid_p_gain_set(struct _pid
*pid
, int percent
)
173 pid
->p_gain
= div_fp(int_tofp(percent
), int_tofp(100));
176 static inline void pid_i_gain_set(struct _pid
*pid
, int percent
)
178 pid
->i_gain
= div_fp(int_tofp(percent
), int_tofp(100));
181 static inline void pid_d_gain_set(struct _pid
*pid
, int percent
)
183 pid
->d_gain
= div_fp(int_tofp(percent
), int_tofp(100));
186 static signed int pid_calc(struct _pid
*pid
, int32_t busy
)
189 int32_t pterm
, dterm
, fp_error
;
190 int32_t integral_limit
;
192 fp_error
= int_tofp(pid
->setpoint
) - busy
;
194 if (abs(fp_error
) <= int_tofp(pid
->deadband
))
197 pterm
= mul_fp(pid
->p_gain
, fp_error
);
199 pid
->integral
+= fp_error
;
201 /* limit the integral term */
202 integral_limit
= int_tofp(30);
203 if (pid
->integral
> integral_limit
)
204 pid
->integral
= integral_limit
;
205 if (pid
->integral
< -integral_limit
)
206 pid
->integral
= -integral_limit
;
208 dterm
= mul_fp(pid
->d_gain
, fp_error
- pid
->last_err
);
209 pid
->last_err
= fp_error
;
211 result
= pterm
+ mul_fp(pid
->integral
, pid
->i_gain
) + dterm
;
212 result
= result
+ (1 << (FRAC_BITS
-1));
213 return (signed int)fp_toint(result
);
216 static inline void intel_pstate_busy_pid_reset(struct cpudata
*cpu
)
218 pid_p_gain_set(&cpu
->pid
, pid_params
.p_gain_pct
);
219 pid_d_gain_set(&cpu
->pid
, pid_params
.d_gain_pct
);
220 pid_i_gain_set(&cpu
->pid
, pid_params
.i_gain_pct
);
222 pid_reset(&cpu
->pid
, pid_params
.setpoint
, 100, pid_params
.deadband
, 0);
225 static inline void intel_pstate_reset_all_pid(void)
229 for_each_online_cpu(cpu
) {
230 if (all_cpu_data
[cpu
])
231 intel_pstate_busy_pid_reset(all_cpu_data
[cpu
]);
235 static inline void update_turbo_state(void)
240 cpu
= all_cpu_data
[0];
241 rdmsrl(MSR_IA32_MISC_ENABLE
, misc_en
);
242 limits
.turbo_disabled
=
243 (misc_en
& MSR_IA32_MISC_ENABLE_TURBO_DISABLE
||
244 cpu
->pstate
.max_pstate
== cpu
->pstate
.turbo_pstate
);
247 /************************** debugfs begin ************************/
248 static int pid_param_set(void *data
, u64 val
)
251 intel_pstate_reset_all_pid();
255 static int pid_param_get(void *data
, u64
*val
)
260 DEFINE_SIMPLE_ATTRIBUTE(fops_pid_param
, pid_param_get
, pid_param_set
, "%llu\n");
267 static struct pid_param pid_files
[] = {
268 {"sample_rate_ms", &pid_params
.sample_rate_ms
},
269 {"d_gain_pct", &pid_params
.d_gain_pct
},
270 {"i_gain_pct", &pid_params
.i_gain_pct
},
271 {"deadband", &pid_params
.deadband
},
272 {"setpoint", &pid_params
.setpoint
},
273 {"p_gain_pct", &pid_params
.p_gain_pct
},
277 static void __init
intel_pstate_debug_expose_params(void)
279 struct dentry
*debugfs_parent
;
282 debugfs_parent
= debugfs_create_dir("pstate_snb", NULL
);
283 if (IS_ERR_OR_NULL(debugfs_parent
))
285 while (pid_files
[i
].name
) {
286 debugfs_create_file(pid_files
[i
].name
, 0660,
287 debugfs_parent
, pid_files
[i
].value
,
293 /************************** debugfs end ************************/
295 /************************** sysfs begin ************************/
296 #define show_one(file_name, object) \
297 static ssize_t show_##file_name \
298 (struct kobject *kobj, struct attribute *attr, char *buf) \
300 return sprintf(buf, "%u\n", limits.object); \
303 static ssize_t
show_no_turbo(struct kobject
*kobj
,
304 struct attribute
*attr
, char *buf
)
308 update_turbo_state();
309 if (limits
.turbo_disabled
)
310 ret
= sprintf(buf
, "%u\n", limits
.turbo_disabled
);
312 ret
= sprintf(buf
, "%u\n", limits
.no_turbo
);
317 static ssize_t
store_no_turbo(struct kobject
*a
, struct attribute
*b
,
318 const char *buf
, size_t count
)
323 ret
= sscanf(buf
, "%u", &input
);
327 update_turbo_state();
328 if (limits
.turbo_disabled
) {
329 pr_warn("Turbo disabled by BIOS or unavailable on processor\n");
332 limits
.no_turbo
= clamp_t(int, input
, 0, 1);
337 static ssize_t
store_max_perf_pct(struct kobject
*a
, struct attribute
*b
,
338 const char *buf
, size_t count
)
343 ret
= sscanf(buf
, "%u", &input
);
347 limits
.max_sysfs_pct
= clamp_t(int, input
, 0 , 100);
348 limits
.max_perf_pct
= min(limits
.max_policy_pct
, limits
.max_sysfs_pct
);
349 limits
.max_perf
= div_fp(int_tofp(limits
.max_perf_pct
), int_tofp(100));
354 static ssize_t
store_min_perf_pct(struct kobject
*a
, struct attribute
*b
,
355 const char *buf
, size_t count
)
360 ret
= sscanf(buf
, "%u", &input
);
363 limits
.min_perf_pct
= clamp_t(int, input
, 0 , 100);
364 limits
.min_perf
= div_fp(int_tofp(limits
.min_perf_pct
), int_tofp(100));
369 show_one(max_perf_pct
, max_perf_pct
);
370 show_one(min_perf_pct
, min_perf_pct
);
372 define_one_global_rw(no_turbo
);
373 define_one_global_rw(max_perf_pct
);
374 define_one_global_rw(min_perf_pct
);
376 static struct attribute
*intel_pstate_attributes
[] = {
383 static struct attribute_group intel_pstate_attr_group
= {
384 .attrs
= intel_pstate_attributes
,
387 static void __init
intel_pstate_sysfs_expose_params(void)
389 struct kobject
*intel_pstate_kobject
;
392 intel_pstate_kobject
= kobject_create_and_add("intel_pstate",
393 &cpu_subsys
.dev_root
->kobj
);
394 BUG_ON(!intel_pstate_kobject
);
395 rc
= sysfs_create_group(intel_pstate_kobject
, &intel_pstate_attr_group
);
399 /************************** sysfs end ************************/
400 static int byt_get_min_pstate(void)
404 rdmsrl(BYT_RATIOS
, value
);
405 return (value
>> 8) & 0x7F;
408 static int byt_get_max_pstate(void)
412 rdmsrl(BYT_RATIOS
, value
);
413 return (value
>> 16) & 0x7F;
416 static int byt_get_turbo_pstate(void)
420 rdmsrl(BYT_TURBO_RATIOS
, value
);
424 static void byt_set_pstate(struct cpudata
*cpudata
, int pstate
)
431 if (limits
.no_turbo
&& !limits
.turbo_disabled
)
434 vid_fp
= cpudata
->vid
.min
+ mul_fp(
435 int_tofp(pstate
- cpudata
->pstate
.min_pstate
),
438 vid_fp
= clamp_t(int32_t, vid_fp
, cpudata
->vid
.min
, cpudata
->vid
.max
);
439 vid
= ceiling_fp(vid_fp
);
441 if (pstate
> cpudata
->pstate
.max_pstate
)
442 vid
= cpudata
->vid
.turbo
;
446 wrmsrl(MSR_IA32_PERF_CTL
, val
);
449 #define BYT_BCLK_FREQS 5
450 static int byt_freq_table
[BYT_BCLK_FREQS
] = { 833, 1000, 1333, 1167, 800};
452 static int byt_get_scaling(void)
457 rdmsrl(MSR_FSB_FREQ
, value
);
460 BUG_ON(i
> BYT_BCLK_FREQS
);
462 return byt_freq_table
[i
] * 100;
465 static void byt_get_vid(struct cpudata
*cpudata
)
469 rdmsrl(BYT_VIDS
, value
);
470 cpudata
->vid
.min
= int_tofp((value
>> 8) & 0x7f);
471 cpudata
->vid
.max
= int_tofp((value
>> 16) & 0x7f);
472 cpudata
->vid
.ratio
= div_fp(
473 cpudata
->vid
.max
- cpudata
->vid
.min
,
474 int_tofp(cpudata
->pstate
.max_pstate
-
475 cpudata
->pstate
.min_pstate
));
477 rdmsrl(BYT_TURBO_VIDS
, value
);
478 cpudata
->vid
.turbo
= value
& 0x7f;
481 static int core_get_min_pstate(void)
485 rdmsrl(MSR_PLATFORM_INFO
, value
);
486 return (value
>> 40) & 0xFF;
489 static int core_get_max_pstate(void)
493 rdmsrl(MSR_PLATFORM_INFO
, value
);
494 return (value
>> 8) & 0xFF;
497 static int core_get_turbo_pstate(void)
502 rdmsrl(MSR_NHM_TURBO_RATIO_LIMIT
, value
);
503 nont
= core_get_max_pstate();
510 static inline int core_get_scaling(void)
515 static void core_set_pstate(struct cpudata
*cpudata
, int pstate
)
520 if (limits
.no_turbo
&& !limits
.turbo_disabled
)
523 wrmsrl_on_cpu(cpudata
->cpu
, MSR_IA32_PERF_CTL
, val
);
526 static struct cpu_defaults core_params
= {
528 .sample_rate_ms
= 10,
536 .get_max
= core_get_max_pstate
,
537 .get_min
= core_get_min_pstate
,
538 .get_turbo
= core_get_turbo_pstate
,
539 .get_scaling
= core_get_scaling
,
540 .set
= core_set_pstate
,
544 static struct cpu_defaults byt_params
= {
546 .sample_rate_ms
= 10,
554 .get_max
= byt_get_max_pstate
,
555 .get_min
= byt_get_min_pstate
,
556 .get_turbo
= byt_get_turbo_pstate
,
557 .set
= byt_set_pstate
,
558 .get_scaling
= byt_get_scaling
,
559 .get_vid
= byt_get_vid
,
563 static void intel_pstate_get_min_max(struct cpudata
*cpu
, int *min
, int *max
)
565 int max_perf
= cpu
->pstate
.turbo_pstate
;
569 if (limits
.no_turbo
|| limits
.turbo_disabled
)
570 max_perf
= cpu
->pstate
.max_pstate
;
572 max_perf_adj
= fp_toint(mul_fp(int_tofp(max_perf
), limits
.max_perf
));
573 *max
= clamp_t(int, max_perf_adj
,
574 cpu
->pstate
.min_pstate
, cpu
->pstate
.turbo_pstate
);
576 min_perf
= fp_toint(mul_fp(int_tofp(max_perf
), limits
.min_perf
));
577 *min
= clamp_t(int, min_perf
, cpu
->pstate
.min_pstate
, max_perf
);
580 static void intel_pstate_set_pstate(struct cpudata
*cpu
, int pstate
)
582 int max_perf
, min_perf
;
584 update_turbo_state();
586 intel_pstate_get_min_max(cpu
, &min_perf
, &max_perf
);
588 pstate
= clamp_t(int, pstate
, min_perf
, max_perf
);
590 if (pstate
== cpu
->pstate
.current_pstate
)
593 trace_cpu_frequency(pstate
* cpu
->pstate
.scaling
, cpu
->cpu
);
595 cpu
->pstate
.current_pstate
= pstate
;
597 pstate_funcs
.set(cpu
, pstate
);
600 static void intel_pstate_get_cpu_pstates(struct cpudata
*cpu
)
602 cpu
->pstate
.min_pstate
= pstate_funcs
.get_min();
603 cpu
->pstate
.max_pstate
= pstate_funcs
.get_max();
604 cpu
->pstate
.turbo_pstate
= pstate_funcs
.get_turbo();
605 cpu
->pstate
.scaling
= pstate_funcs
.get_scaling();
607 if (pstate_funcs
.get_vid
)
608 pstate_funcs
.get_vid(cpu
);
609 intel_pstate_set_pstate(cpu
, cpu
->pstate
.min_pstate
);
612 static inline void intel_pstate_calc_busy(struct cpudata
*cpu
)
614 struct sample
*sample
= &cpu
->sample
;
617 core_pct
= int_tofp(sample
->aperf
) * int_tofp(100);
618 core_pct
= div64_u64(core_pct
, int_tofp(sample
->mperf
));
620 sample
->freq
= fp_toint(
622 cpu
->pstate
.max_pstate
* cpu
->pstate
.scaling
/ 100),
625 sample
->core_pct_busy
= (int32_t)core_pct
;
628 static inline void intel_pstate_sample(struct cpudata
*cpu
)
633 local_irq_save(flags
);
634 rdmsrl(MSR_IA32_APERF
, aperf
);
635 rdmsrl(MSR_IA32_MPERF
, mperf
);
636 local_irq_restore(flags
);
638 cpu
->last_sample_time
= cpu
->sample
.time
;
639 cpu
->sample
.time
= ktime_get();
640 cpu
->sample
.aperf
= aperf
;
641 cpu
->sample
.mperf
= mperf
;
642 cpu
->sample
.aperf
-= cpu
->prev_aperf
;
643 cpu
->sample
.mperf
-= cpu
->prev_mperf
;
645 intel_pstate_calc_busy(cpu
);
647 cpu
->prev_aperf
= aperf
;
648 cpu
->prev_mperf
= mperf
;
651 static inline void intel_pstate_set_sample_time(struct cpudata
*cpu
)
655 delay
= msecs_to_jiffies(pid_params
.sample_rate_ms
);
656 mod_timer_pinned(&cpu
->timer
, jiffies
+ delay
);
659 static inline int32_t intel_pstate_get_scaled_busy(struct cpudata
*cpu
)
661 int32_t core_busy
, max_pstate
, current_pstate
, sample_ratio
;
665 core_busy
= cpu
->sample
.core_pct_busy
;
666 max_pstate
= int_tofp(cpu
->pstate
.max_pstate
);
667 current_pstate
= int_tofp(cpu
->pstate
.current_pstate
);
668 core_busy
= mul_fp(core_busy
, div_fp(max_pstate
, current_pstate
));
670 sample_time
= pid_params
.sample_rate_ms
* USEC_PER_MSEC
;
671 duration_us
= (u32
) ktime_us_delta(cpu
->sample
.time
,
672 cpu
->last_sample_time
);
673 if (duration_us
> sample_time
* 3) {
674 sample_ratio
= div_fp(int_tofp(sample_time
),
675 int_tofp(duration_us
));
676 core_busy
= mul_fp(core_busy
, sample_ratio
);
682 static inline void intel_pstate_adjust_busy_pstate(struct cpudata
*cpu
)
689 busy_scaled
= intel_pstate_get_scaled_busy(cpu
);
691 ctl
= pid_calc(pid
, busy_scaled
);
693 /* Negative values of ctl increase the pstate and vice versa */
694 intel_pstate_set_pstate(cpu
, cpu
->pstate
.current_pstate
- ctl
);
697 static void intel_pstate_timer_func(unsigned long __data
)
699 struct cpudata
*cpu
= (struct cpudata
*) __data
;
700 struct sample
*sample
;
702 intel_pstate_sample(cpu
);
704 sample
= &cpu
->sample
;
706 intel_pstate_adjust_busy_pstate(cpu
);
708 trace_pstate_sample(fp_toint(sample
->core_pct_busy
),
709 fp_toint(intel_pstate_get_scaled_busy(cpu
)),
710 cpu
->pstate
.current_pstate
,
715 intel_pstate_set_sample_time(cpu
);
718 #define ICPU(model, policy) \
719 { X86_VENDOR_INTEL, 6, model, X86_FEATURE_APERFMPERF,\
720 (unsigned long)&policy }
722 static const struct x86_cpu_id intel_pstate_cpu_ids
[] = {
723 ICPU(0x2a, core_params
),
724 ICPU(0x2d, core_params
),
725 ICPU(0x37, byt_params
),
726 ICPU(0x3a, core_params
),
727 ICPU(0x3c, core_params
),
728 ICPU(0x3d, core_params
),
729 ICPU(0x3e, core_params
),
730 ICPU(0x3f, core_params
),
731 ICPU(0x45, core_params
),
732 ICPU(0x46, core_params
),
733 ICPU(0x4c, byt_params
),
734 ICPU(0x4f, core_params
),
735 ICPU(0x56, core_params
),
738 MODULE_DEVICE_TABLE(x86cpu
, intel_pstate_cpu_ids
);
740 static int intel_pstate_init_cpu(unsigned int cpunum
)
744 if (!all_cpu_data
[cpunum
])
745 all_cpu_data
[cpunum
] = kzalloc(sizeof(struct cpudata
),
747 if (!all_cpu_data
[cpunum
])
750 cpu
= all_cpu_data
[cpunum
];
753 intel_pstate_get_cpu_pstates(cpu
);
755 init_timer_deferrable(&cpu
->timer
);
756 cpu
->timer
.function
= intel_pstate_timer_func
;
757 cpu
->timer
.data
= (unsigned long)cpu
;
758 cpu
->timer
.expires
= jiffies
+ HZ
/100;
759 intel_pstate_busy_pid_reset(cpu
);
760 intel_pstate_sample(cpu
);
762 add_timer_on(&cpu
->timer
, cpunum
);
764 pr_debug("Intel pstate controlling: cpu %d\n", cpunum
);
769 static unsigned int intel_pstate_get(unsigned int cpu_num
)
771 struct sample
*sample
;
774 cpu
= all_cpu_data
[cpu_num
];
777 sample
= &cpu
->sample
;
781 static int intel_pstate_set_policy(struct cpufreq_policy
*policy
)
783 if (!policy
->cpuinfo
.max_freq
)
786 if (policy
->policy
== CPUFREQ_POLICY_PERFORMANCE
) {
787 limits
.min_perf_pct
= 100;
788 limits
.min_perf
= int_tofp(1);
789 limits
.max_policy_pct
= 100;
790 limits
.max_perf_pct
= 100;
791 limits
.max_perf
= int_tofp(1);
795 limits
.min_perf_pct
= (policy
->min
* 100) / policy
->cpuinfo
.max_freq
;
796 limits
.min_perf_pct
= clamp_t(int, limits
.min_perf_pct
, 0 , 100);
797 limits
.min_perf
= div_fp(int_tofp(limits
.min_perf_pct
), int_tofp(100));
799 limits
.max_policy_pct
= (policy
->max
* 100) / policy
->cpuinfo
.max_freq
;
800 limits
.max_policy_pct
= clamp_t(int, limits
.max_policy_pct
, 0 , 100);
801 limits
.max_perf_pct
= min(limits
.max_policy_pct
, limits
.max_sysfs_pct
);
802 limits
.max_perf
= div_fp(int_tofp(limits
.max_perf_pct
), int_tofp(100));
807 static int intel_pstate_verify_policy(struct cpufreq_policy
*policy
)
809 cpufreq_verify_within_cpu_limits(policy
);
811 if (policy
->policy
!= CPUFREQ_POLICY_POWERSAVE
&&
812 policy
->policy
!= CPUFREQ_POLICY_PERFORMANCE
)
818 static void intel_pstate_stop_cpu(struct cpufreq_policy
*policy
)
820 int cpu_num
= policy
->cpu
;
821 struct cpudata
*cpu
= all_cpu_data
[cpu_num
];
823 pr_info("intel_pstate CPU %d exiting\n", cpu_num
);
825 del_timer_sync(&all_cpu_data
[cpu_num
]->timer
);
826 intel_pstate_set_pstate(cpu
, cpu
->pstate
.min_pstate
);
829 static int intel_pstate_cpu_init(struct cpufreq_policy
*policy
)
834 rc
= intel_pstate_init_cpu(policy
->cpu
);
838 cpu
= all_cpu_data
[policy
->cpu
];
840 if (limits
.min_perf_pct
== 100 && limits
.max_perf_pct
== 100)
841 policy
->policy
= CPUFREQ_POLICY_PERFORMANCE
;
843 policy
->policy
= CPUFREQ_POLICY_POWERSAVE
;
845 policy
->min
= cpu
->pstate
.min_pstate
* cpu
->pstate
.scaling
;
846 policy
->max
= cpu
->pstate
.turbo_pstate
* cpu
->pstate
.scaling
;
848 /* cpuinfo and default policy values */
849 policy
->cpuinfo
.min_freq
= cpu
->pstate
.min_pstate
* cpu
->pstate
.scaling
;
850 policy
->cpuinfo
.max_freq
=
851 cpu
->pstate
.turbo_pstate
* cpu
->pstate
.scaling
;
852 policy
->cpuinfo
.transition_latency
= CPUFREQ_ETERNAL
;
853 cpumask_set_cpu(policy
->cpu
, policy
->cpus
);
858 static struct cpufreq_driver intel_pstate_driver
= {
859 .flags
= CPUFREQ_CONST_LOOPS
,
860 .verify
= intel_pstate_verify_policy
,
861 .setpolicy
= intel_pstate_set_policy
,
862 .get
= intel_pstate_get
,
863 .init
= intel_pstate_cpu_init
,
864 .stop_cpu
= intel_pstate_stop_cpu
,
865 .name
= "intel_pstate",
868 static int __initdata no_load
;
870 static int intel_pstate_msrs_not_valid(void)
872 /* Check that all the msr's we are using are valid. */
873 u64 aperf
, mperf
, tmp
;
875 rdmsrl(MSR_IA32_APERF
, aperf
);
876 rdmsrl(MSR_IA32_MPERF
, mperf
);
878 if (!pstate_funcs
.get_max() ||
879 !pstate_funcs
.get_min() ||
880 !pstate_funcs
.get_turbo())
883 rdmsrl(MSR_IA32_APERF
, tmp
);
887 rdmsrl(MSR_IA32_MPERF
, tmp
);
894 static void copy_pid_params(struct pstate_adjust_policy
*policy
)
896 pid_params
.sample_rate_ms
= policy
->sample_rate_ms
;
897 pid_params
.p_gain_pct
= policy
->p_gain_pct
;
898 pid_params
.i_gain_pct
= policy
->i_gain_pct
;
899 pid_params
.d_gain_pct
= policy
->d_gain_pct
;
900 pid_params
.deadband
= policy
->deadband
;
901 pid_params
.setpoint
= policy
->setpoint
;
904 static void copy_cpu_funcs(struct pstate_funcs
*funcs
)
906 pstate_funcs
.get_max
= funcs
->get_max
;
907 pstate_funcs
.get_min
= funcs
->get_min
;
908 pstate_funcs
.get_turbo
= funcs
->get_turbo
;
909 pstate_funcs
.get_scaling
= funcs
->get_scaling
;
910 pstate_funcs
.set
= funcs
->set
;
911 pstate_funcs
.get_vid
= funcs
->get_vid
;
914 #if IS_ENABLED(CONFIG_ACPI)
915 #include <acpi/processor.h>
917 static bool intel_pstate_no_acpi_pss(void)
921 for_each_possible_cpu(i
) {
923 union acpi_object
*pss
;
924 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
925 struct acpi_processor
*pr
= per_cpu(processors
, i
);
930 status
= acpi_evaluate_object(pr
->handle
, "_PSS", NULL
, &buffer
);
931 if (ACPI_FAILURE(status
))
934 pss
= buffer
.pointer
;
935 if (pss
&& pss
->type
== ACPI_TYPE_PACKAGE
) {
946 struct hw_vendor_info
{
948 char oem_id
[ACPI_OEM_ID_SIZE
];
949 char oem_table_id
[ACPI_OEM_TABLE_ID_SIZE
];
952 /* Hardware vendor-specific info that has its own power management modes */
953 static struct hw_vendor_info vendor_info
[] = {
954 {1, "HP ", "ProLiant"},
958 static bool intel_pstate_platform_pwr_mgmt_exists(void)
960 struct acpi_table_header hdr
;
961 struct hw_vendor_info
*v_info
;
964 ACPI_FAILURE(acpi_get_table_header(ACPI_SIG_FADT
, 0, &hdr
)))
967 for (v_info
= vendor_info
; v_info
->valid
; v_info
++) {
968 if (!strncmp(hdr
.oem_id
, v_info
->oem_id
, ACPI_OEM_ID_SIZE
) &&
969 !strncmp(hdr
.oem_table_id
, v_info
->oem_table_id
, ACPI_OEM_TABLE_ID_SIZE
) &&
970 intel_pstate_no_acpi_pss())
976 #else /* CONFIG_ACPI not enabled */
977 static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; }
978 #endif /* CONFIG_ACPI */
980 static int __init
intel_pstate_init(void)
983 const struct x86_cpu_id
*id
;
984 struct cpu_defaults
*cpu_info
;
989 id
= x86_match_cpu(intel_pstate_cpu_ids
);
994 * The Intel pstate driver will be ignored if the platform
995 * firmware has its own power management modes.
997 if (intel_pstate_platform_pwr_mgmt_exists())
1000 cpu_info
= (struct cpu_defaults
*)id
->driver_data
;
1002 copy_pid_params(&cpu_info
->pid_policy
);
1003 copy_cpu_funcs(&cpu_info
->funcs
);
1005 if (intel_pstate_msrs_not_valid())
1008 pr_info("Intel P-state driver initializing.\n");
1010 all_cpu_data
= vzalloc(sizeof(void *) * num_possible_cpus());
1014 rc
= cpufreq_register_driver(&intel_pstate_driver
);
1018 intel_pstate_debug_expose_params();
1019 intel_pstate_sysfs_expose_params();
1024 for_each_online_cpu(cpu
) {
1025 if (all_cpu_data
[cpu
]) {
1026 del_timer_sync(&all_cpu_data
[cpu
]->timer
);
1027 kfree(all_cpu_data
[cpu
]);
1032 vfree(all_cpu_data
);
1035 device_initcall(intel_pstate_init
);
1037 static int __init
intel_pstate_setup(char *str
)
1042 if (!strcmp(str
, "disable"))
1046 early_param("intel_pstate", intel_pstate_setup
);
1048 MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@intel.com>");
1049 MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors");
1050 MODULE_LICENSE("GPL");