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 SAMPLE_COUNT 3
37 #define BYT_RATIOS 0x66a
38 #define BYT_VIDS 0x66b
39 #define BYT_TURBO_RATIOS 0x66c
40 #define BYT_TURBO_VIDS 0x66d
44 #define int_tofp(X) ((int64_t)(X) << FRAC_BITS)
45 #define fp_toint(X) ((X) >> FRAC_BITS)
46 #define FP_ROUNDUP(X) ((X) += 1 << FRAC_BITS)
48 static inline int32_t mul_fp(int32_t x
, int32_t y
)
50 return ((int64_t)x
* (int64_t)y
) >> FRAC_BITS
;
53 static inline int32_t div_fp(int32_t x
, int32_t y
)
55 return div_s64((int64_t)x
<< FRAC_BITS
, (int64_t)y
);
59 int32_t core_pct_busy
;
62 unsigned long long tsc
;
95 struct timer_list timer
;
97 struct pstate_data pstate
;
103 unsigned long long prev_tsc
;
104 struct sample sample
;
107 static struct cpudata
**all_cpu_data
;
108 struct pstate_adjust_policy
{
117 struct pstate_funcs
{
118 int (*get_max
)(void);
119 int (*get_min
)(void);
120 int (*get_turbo
)(void);
121 void (*set
)(struct cpudata
*, int pstate
);
122 void (*get_vid
)(struct cpudata
*);
125 struct cpu_defaults
{
126 struct pstate_adjust_policy pid_policy
;
127 struct pstate_funcs funcs
;
130 static struct pstate_adjust_policy pid_params
;
131 static struct pstate_funcs pstate_funcs
;
143 static struct perf_limits limits
= {
146 .max_perf
= int_tofp(1),
149 .max_policy_pct
= 100,
150 .max_sysfs_pct
= 100,
153 static inline void pid_reset(struct _pid
*pid
, int setpoint
, int busy
,
154 int deadband
, int integral
) {
155 pid
->setpoint
= setpoint
;
156 pid
->deadband
= deadband
;
157 pid
->integral
= int_tofp(integral
);
158 pid
->last_err
= int_tofp(setpoint
) - int_tofp(busy
);
161 static inline void pid_p_gain_set(struct _pid
*pid
, int percent
)
163 pid
->p_gain
= div_fp(int_tofp(percent
), int_tofp(100));
166 static inline void pid_i_gain_set(struct _pid
*pid
, int percent
)
168 pid
->i_gain
= div_fp(int_tofp(percent
), int_tofp(100));
171 static inline void pid_d_gain_set(struct _pid
*pid
, int percent
)
174 pid
->d_gain
= div_fp(int_tofp(percent
), int_tofp(100));
177 static signed int pid_calc(struct _pid
*pid
, int32_t busy
)
180 int32_t pterm
, dterm
, fp_error
;
181 int32_t integral_limit
;
183 fp_error
= int_tofp(pid
->setpoint
) - busy
;
185 if (abs(fp_error
) <= int_tofp(pid
->deadband
))
188 pterm
= mul_fp(pid
->p_gain
, fp_error
);
190 pid
->integral
+= fp_error
;
192 /* limit the integral term */
193 integral_limit
= int_tofp(30);
194 if (pid
->integral
> integral_limit
)
195 pid
->integral
= integral_limit
;
196 if (pid
->integral
< -integral_limit
)
197 pid
->integral
= -integral_limit
;
199 dterm
= mul_fp(pid
->d_gain
, fp_error
- pid
->last_err
);
200 pid
->last_err
= fp_error
;
202 result
= pterm
+ mul_fp(pid
->integral
, pid
->i_gain
) + dterm
;
204 return (signed int)fp_toint(result
);
207 static inline void intel_pstate_busy_pid_reset(struct cpudata
*cpu
)
209 pid_p_gain_set(&cpu
->pid
, pid_params
.p_gain_pct
);
210 pid_d_gain_set(&cpu
->pid
, pid_params
.d_gain_pct
);
211 pid_i_gain_set(&cpu
->pid
, pid_params
.i_gain_pct
);
220 static inline void intel_pstate_reset_all_pid(void)
223 for_each_online_cpu(cpu
) {
224 if (all_cpu_data
[cpu
])
225 intel_pstate_busy_pid_reset(all_cpu_data
[cpu
]);
229 /************************** debugfs begin ************************/
230 static int pid_param_set(void *data
, u64 val
)
233 intel_pstate_reset_all_pid();
236 static int pid_param_get(void *data
, u64
*val
)
241 DEFINE_SIMPLE_ATTRIBUTE(fops_pid_param
, pid_param_get
,
242 pid_param_set
, "%llu\n");
249 static struct pid_param pid_files
[] = {
250 {"sample_rate_ms", &pid_params
.sample_rate_ms
},
251 {"d_gain_pct", &pid_params
.d_gain_pct
},
252 {"i_gain_pct", &pid_params
.i_gain_pct
},
253 {"deadband", &pid_params
.deadband
},
254 {"setpoint", &pid_params
.setpoint
},
255 {"p_gain_pct", &pid_params
.p_gain_pct
},
259 static struct dentry
*debugfs_parent
;
260 static void intel_pstate_debug_expose_params(void)
264 debugfs_parent
= debugfs_create_dir("pstate_snb", NULL
);
265 if (IS_ERR_OR_NULL(debugfs_parent
))
267 while (pid_files
[i
].name
) {
268 debugfs_create_file(pid_files
[i
].name
, 0660,
269 debugfs_parent
, pid_files
[i
].value
,
275 /************************** debugfs end ************************/
277 /************************** sysfs begin ************************/
278 #define show_one(file_name, object) \
279 static ssize_t show_##file_name \
280 (struct kobject *kobj, struct attribute *attr, char *buf) \
282 return sprintf(buf, "%u\n", limits.object); \
285 static ssize_t
store_no_turbo(struct kobject
*a
, struct attribute
*b
,
286 const char *buf
, size_t count
)
290 ret
= sscanf(buf
, "%u", &input
);
293 limits
.no_turbo
= clamp_t(int, input
, 0 , 1);
298 static ssize_t
store_max_perf_pct(struct kobject
*a
, struct attribute
*b
,
299 const char *buf
, size_t count
)
303 ret
= sscanf(buf
, "%u", &input
);
307 limits
.max_sysfs_pct
= clamp_t(int, input
, 0 , 100);
308 limits
.max_perf_pct
= min(limits
.max_policy_pct
, limits
.max_sysfs_pct
);
309 limits
.max_perf
= div_fp(int_tofp(limits
.max_perf_pct
), int_tofp(100));
313 static ssize_t
store_min_perf_pct(struct kobject
*a
, struct attribute
*b
,
314 const char *buf
, size_t count
)
318 ret
= sscanf(buf
, "%u", &input
);
321 limits
.min_perf_pct
= clamp_t(int, input
, 0 , 100);
322 limits
.min_perf
= div_fp(int_tofp(limits
.min_perf_pct
), int_tofp(100));
327 show_one(no_turbo
, no_turbo
);
328 show_one(max_perf_pct
, max_perf_pct
);
329 show_one(min_perf_pct
, min_perf_pct
);
331 define_one_global_rw(no_turbo
);
332 define_one_global_rw(max_perf_pct
);
333 define_one_global_rw(min_perf_pct
);
335 static struct attribute
*intel_pstate_attributes
[] = {
342 static struct attribute_group intel_pstate_attr_group
= {
343 .attrs
= intel_pstate_attributes
,
345 static struct kobject
*intel_pstate_kobject
;
347 static void intel_pstate_sysfs_expose_params(void)
351 intel_pstate_kobject
= kobject_create_and_add("intel_pstate",
352 &cpu_subsys
.dev_root
->kobj
);
353 BUG_ON(!intel_pstate_kobject
);
354 rc
= sysfs_create_group(intel_pstate_kobject
,
355 &intel_pstate_attr_group
);
359 /************************** sysfs end ************************/
360 static int byt_get_min_pstate(void)
363 rdmsrl(BYT_RATIOS
, value
);
364 return (value
>> 8) & 0x3F;
367 static int byt_get_max_pstate(void)
370 rdmsrl(BYT_RATIOS
, value
);
371 return (value
>> 16) & 0x3F;
374 static int byt_get_turbo_pstate(void)
377 rdmsrl(BYT_TURBO_RATIOS
, value
);
381 static void byt_set_pstate(struct cpudata
*cpudata
, int pstate
)
391 vid_fp
= cpudata
->vid
.min
+ mul_fp(
392 int_tofp(pstate
- cpudata
->pstate
.min_pstate
),
395 vid_fp
= clamp_t(int32_t, vid_fp
, cpudata
->vid
.min
, cpudata
->vid
.max
);
396 vid
= fp_toint(vid_fp
);
398 if (pstate
> cpudata
->pstate
.max_pstate
)
399 vid
= cpudata
->vid
.turbo
;
403 wrmsrl(MSR_IA32_PERF_CTL
, val
);
406 static void byt_get_vid(struct cpudata
*cpudata
)
411 rdmsrl(BYT_VIDS
, value
);
412 cpudata
->vid
.min
= int_tofp((value
>> 8) & 0x3f);
413 cpudata
->vid
.max
= int_tofp((value
>> 16) & 0x3f);
414 cpudata
->vid
.ratio
= div_fp(
415 cpudata
->vid
.max
- cpudata
->vid
.min
,
416 int_tofp(cpudata
->pstate
.max_pstate
-
417 cpudata
->pstate
.min_pstate
));
419 rdmsrl(BYT_TURBO_VIDS
, value
);
420 cpudata
->vid
.turbo
= value
& 0x7f;
424 static int core_get_min_pstate(void)
427 rdmsrl(MSR_PLATFORM_INFO
, value
);
428 return (value
>> 40) & 0xFF;
431 static int core_get_max_pstate(void)
434 rdmsrl(MSR_PLATFORM_INFO
, value
);
435 return (value
>> 8) & 0xFF;
438 static int core_get_turbo_pstate(void)
442 rdmsrl(MSR_NHM_TURBO_RATIO_LIMIT
, value
);
443 nont
= core_get_max_pstate();
444 ret
= ((value
) & 255);
450 static void core_set_pstate(struct cpudata
*cpudata
, int pstate
)
458 wrmsrl_on_cpu(cpudata
->cpu
, MSR_IA32_PERF_CTL
, val
);
461 static struct cpu_defaults core_params
= {
463 .sample_rate_ms
= 10,
471 .get_max
= core_get_max_pstate
,
472 .get_min
= core_get_min_pstate
,
473 .get_turbo
= core_get_turbo_pstate
,
474 .set
= core_set_pstate
,
478 static struct cpu_defaults byt_params
= {
480 .sample_rate_ms
= 10,
488 .get_max
= byt_get_max_pstate
,
489 .get_min
= byt_get_min_pstate
,
490 .get_turbo
= byt_get_turbo_pstate
,
491 .set
= byt_set_pstate
,
492 .get_vid
= byt_get_vid
,
497 static void intel_pstate_get_min_max(struct cpudata
*cpu
, int *min
, int *max
)
499 int max_perf
= cpu
->pstate
.turbo_pstate
;
503 max_perf
= cpu
->pstate
.max_pstate
;
505 max_perf_adj
= fp_toint(mul_fp(int_tofp(max_perf
), limits
.max_perf
));
506 *max
= clamp_t(int, max_perf_adj
,
507 cpu
->pstate
.min_pstate
, cpu
->pstate
.turbo_pstate
);
509 min_perf
= fp_toint(mul_fp(int_tofp(max_perf
), limits
.min_perf
));
510 *min
= clamp_t(int, min_perf
,
511 cpu
->pstate
.min_pstate
, max_perf
);
514 static void intel_pstate_set_pstate(struct cpudata
*cpu
, int pstate
)
516 int max_perf
, min_perf
;
518 intel_pstate_get_min_max(cpu
, &min_perf
, &max_perf
);
520 pstate
= clamp_t(int, pstate
, min_perf
, max_perf
);
522 if (pstate
== cpu
->pstate
.current_pstate
)
525 trace_cpu_frequency(pstate
* 100000, cpu
->cpu
);
527 cpu
->pstate
.current_pstate
= pstate
;
529 pstate_funcs
.set(cpu
, pstate
);
532 static inline void intel_pstate_pstate_increase(struct cpudata
*cpu
, int steps
)
535 target
= cpu
->pstate
.current_pstate
+ steps
;
537 intel_pstate_set_pstate(cpu
, target
);
540 static inline void intel_pstate_pstate_decrease(struct cpudata
*cpu
, int steps
)
543 target
= cpu
->pstate
.current_pstate
- steps
;
544 intel_pstate_set_pstate(cpu
, target
);
547 static void intel_pstate_get_cpu_pstates(struct cpudata
*cpu
)
549 sprintf(cpu
->name
, "Intel 2nd generation core");
551 cpu
->pstate
.min_pstate
= pstate_funcs
.get_min();
552 cpu
->pstate
.max_pstate
= pstate_funcs
.get_max();
553 cpu
->pstate
.turbo_pstate
= pstate_funcs
.get_turbo();
555 if (pstate_funcs
.get_vid
)
556 pstate_funcs
.get_vid(cpu
);
559 * goto max pstate so we don't slow up boot if we are built-in if we are
560 * a module we will take care of it during normal operation
562 intel_pstate_set_pstate(cpu
, cpu
->pstate
.max_pstate
);
565 static inline void intel_pstate_calc_busy(struct cpudata
*cpu
,
566 struct sample
*sample
)
571 core_pct
= div_fp(int_tofp((sample
->aperf
)),
572 int_tofp((sample
->mperf
)));
573 core_pct
= mul_fp(core_pct
, int_tofp(100));
574 FP_ROUNDUP(core_pct
);
576 c0_pct
= div_fp(int_tofp(sample
->mperf
), int_tofp(sample
->tsc
));
578 sample
->freq
= fp_toint(
579 mul_fp(int_tofp(cpu
->pstate
.max_pstate
* 1000), core_pct
));
581 sample
->core_pct_busy
= mul_fp(core_pct
, c0_pct
);
584 static inline void intel_pstate_sample(struct cpudata
*cpu
)
587 unsigned long long tsc
;
589 rdmsrl(MSR_IA32_APERF
, aperf
);
590 rdmsrl(MSR_IA32_MPERF
, mperf
);
591 tsc
= native_read_tsc();
593 aperf
= aperf
>> FRAC_BITS
;
594 mperf
= mperf
>> FRAC_BITS
;
595 tsc
= tsc
>> FRAC_BITS
;
597 cpu
->sample
.aperf
= aperf
;
598 cpu
->sample
.mperf
= mperf
;
599 cpu
->sample
.tsc
= tsc
;
600 cpu
->sample
.aperf
-= cpu
->prev_aperf
;
601 cpu
->sample
.mperf
-= cpu
->prev_mperf
;
602 cpu
->sample
.tsc
-= cpu
->prev_tsc
;
604 intel_pstate_calc_busy(cpu
, &cpu
->sample
);
606 cpu
->prev_aperf
= aperf
;
607 cpu
->prev_mperf
= mperf
;
611 static inline void intel_pstate_set_sample_time(struct cpudata
*cpu
)
613 int sample_time
, delay
;
615 sample_time
= pid_params
.sample_rate_ms
;
616 delay
= msecs_to_jiffies(sample_time
);
617 mod_timer_pinned(&cpu
->timer
, jiffies
+ delay
);
620 static inline int32_t intel_pstate_get_scaled_busy(struct cpudata
*cpu
)
622 int32_t core_busy
, max_pstate
, current_pstate
;
624 core_busy
= cpu
->sample
.core_pct_busy
;
625 max_pstate
= int_tofp(cpu
->pstate
.max_pstate
);
626 current_pstate
= int_tofp(cpu
->pstate
.current_pstate
);
627 core_busy
= mul_fp(core_busy
, div_fp(max_pstate
, current_pstate
));
628 return FP_ROUNDUP(core_busy
);
631 static inline void intel_pstate_adjust_busy_pstate(struct cpudata
*cpu
)
639 busy_scaled
= intel_pstate_get_scaled_busy(cpu
);
641 ctl
= pid_calc(pid
, busy_scaled
);
646 intel_pstate_pstate_increase(cpu
, steps
);
648 intel_pstate_pstate_decrease(cpu
, steps
);
651 static void intel_pstate_timer_func(unsigned long __data
)
653 struct cpudata
*cpu
= (struct cpudata
*) __data
;
654 struct sample
*sample
;
656 intel_pstate_sample(cpu
);
658 sample
= &cpu
->sample
;
660 intel_pstate_adjust_busy_pstate(cpu
);
662 trace_pstate_sample(fp_toint(sample
->core_pct_busy
),
663 fp_toint(intel_pstate_get_scaled_busy(cpu
)),
664 cpu
->pstate
.current_pstate
,
669 intel_pstate_set_sample_time(cpu
);
672 #define ICPU(model, policy) \
673 { X86_VENDOR_INTEL, 6, model, X86_FEATURE_APERFMPERF,\
674 (unsigned long)&policy }
676 static const struct x86_cpu_id intel_pstate_cpu_ids
[] = {
677 ICPU(0x2a, core_params
),
678 ICPU(0x2d, core_params
),
679 ICPU(0x37, byt_params
),
680 ICPU(0x3a, core_params
),
681 ICPU(0x3c, core_params
),
682 ICPU(0x3e, core_params
),
683 ICPU(0x3f, core_params
),
684 ICPU(0x45, core_params
),
685 ICPU(0x46, core_params
),
688 MODULE_DEVICE_TABLE(x86cpu
, intel_pstate_cpu_ids
);
690 static int intel_pstate_init_cpu(unsigned int cpunum
)
693 const struct x86_cpu_id
*id
;
696 id
= x86_match_cpu(intel_pstate_cpu_ids
);
700 all_cpu_data
[cpunum
] = kzalloc(sizeof(struct cpudata
), GFP_KERNEL
);
701 if (!all_cpu_data
[cpunum
])
704 cpu
= all_cpu_data
[cpunum
];
706 intel_pstate_get_cpu_pstates(cpu
);
707 if (!cpu
->pstate
.current_pstate
) {
708 all_cpu_data
[cpunum
] = NULL
;
715 init_timer_deferrable(&cpu
->timer
);
716 cpu
->timer
.function
= intel_pstate_timer_func
;
719 cpu
->timer
.expires
= jiffies
+ HZ
/100;
720 intel_pstate_busy_pid_reset(cpu
);
721 intel_pstate_sample(cpu
);
722 intel_pstate_set_pstate(cpu
, cpu
->pstate
.max_pstate
);
724 add_timer_on(&cpu
->timer
, cpunum
);
726 pr_info("Intel pstate controlling: cpu %d\n", cpunum
);
731 static unsigned int intel_pstate_get(unsigned int cpu_num
)
733 struct sample
*sample
;
736 cpu
= all_cpu_data
[cpu_num
];
739 sample
= &cpu
->sample
;
743 static int intel_pstate_set_policy(struct cpufreq_policy
*policy
)
747 cpu
= all_cpu_data
[policy
->cpu
];
749 if (!policy
->cpuinfo
.max_freq
)
752 if (policy
->policy
== CPUFREQ_POLICY_PERFORMANCE
) {
753 limits
.min_perf_pct
= 100;
754 limits
.min_perf
= int_tofp(1);
755 limits
.max_perf_pct
= 100;
756 limits
.max_perf
= int_tofp(1);
760 limits
.min_perf_pct
= (policy
->min
* 100) / policy
->cpuinfo
.max_freq
;
761 limits
.min_perf_pct
= clamp_t(int, limits
.min_perf_pct
, 0 , 100);
762 limits
.min_perf
= div_fp(int_tofp(limits
.min_perf_pct
), int_tofp(100));
764 limits
.max_policy_pct
= policy
->max
* 100 / policy
->cpuinfo
.max_freq
;
765 limits
.max_policy_pct
= clamp_t(int, limits
.max_policy_pct
, 0 , 100);
766 limits
.max_perf_pct
= min(limits
.max_policy_pct
, limits
.max_sysfs_pct
);
767 limits
.max_perf
= div_fp(int_tofp(limits
.max_perf_pct
), int_tofp(100));
772 static int intel_pstate_verify_policy(struct cpufreq_policy
*policy
)
774 cpufreq_verify_within_cpu_limits(policy
);
776 if ((policy
->policy
!= CPUFREQ_POLICY_POWERSAVE
) &&
777 (policy
->policy
!= CPUFREQ_POLICY_PERFORMANCE
))
783 static void intel_pstate_stop_cpu(struct cpufreq_policy
*policy
)
785 int cpu_num
= policy
->cpu
;
786 struct cpudata
*cpu
= all_cpu_data
[cpu_num
];
788 pr_info("intel_pstate CPU %d exiting\n", cpu_num
);
790 del_timer_sync(&all_cpu_data
[cpu_num
]->timer
);
791 intel_pstate_set_pstate(cpu
, cpu
->pstate
.min_pstate
);
792 kfree(all_cpu_data
[cpu_num
]);
793 all_cpu_data
[cpu_num
] = NULL
;
796 static int intel_pstate_cpu_init(struct cpufreq_policy
*policy
)
801 rc
= intel_pstate_init_cpu(policy
->cpu
);
805 cpu
= all_cpu_data
[policy
->cpu
];
807 if (!limits
.no_turbo
&&
808 limits
.min_perf_pct
== 100 && limits
.max_perf_pct
== 100)
809 policy
->policy
= CPUFREQ_POLICY_PERFORMANCE
;
811 policy
->policy
= CPUFREQ_POLICY_POWERSAVE
;
813 policy
->min
= cpu
->pstate
.min_pstate
* 100000;
814 policy
->max
= cpu
->pstate
.turbo_pstate
* 100000;
816 /* cpuinfo and default policy values */
817 policy
->cpuinfo
.min_freq
= cpu
->pstate
.min_pstate
* 100000;
818 policy
->cpuinfo
.max_freq
= cpu
->pstate
.turbo_pstate
* 100000;
819 policy
->cpuinfo
.transition_latency
= CPUFREQ_ETERNAL
;
820 cpumask_set_cpu(policy
->cpu
, policy
->cpus
);
825 static struct cpufreq_driver intel_pstate_driver
= {
826 .flags
= CPUFREQ_CONST_LOOPS
,
827 .verify
= intel_pstate_verify_policy
,
828 .setpolicy
= intel_pstate_set_policy
,
829 .get
= intel_pstate_get
,
830 .init
= intel_pstate_cpu_init
,
831 .stop_cpu
= intel_pstate_stop_cpu
,
832 .name
= "intel_pstate",
835 static int __initdata no_load
;
837 static int intel_pstate_msrs_not_valid(void)
839 /* Check that all the msr's we are using are valid. */
840 u64 aperf
, mperf
, tmp
;
842 rdmsrl(MSR_IA32_APERF
, aperf
);
843 rdmsrl(MSR_IA32_MPERF
, mperf
);
845 if (!pstate_funcs
.get_max() ||
846 !pstate_funcs
.get_min() ||
847 !pstate_funcs
.get_turbo())
850 rdmsrl(MSR_IA32_APERF
, tmp
);
854 rdmsrl(MSR_IA32_MPERF
, tmp
);
861 static void copy_pid_params(struct pstate_adjust_policy
*policy
)
863 pid_params
.sample_rate_ms
= policy
->sample_rate_ms
;
864 pid_params
.p_gain_pct
= policy
->p_gain_pct
;
865 pid_params
.i_gain_pct
= policy
->i_gain_pct
;
866 pid_params
.d_gain_pct
= policy
->d_gain_pct
;
867 pid_params
.deadband
= policy
->deadband
;
868 pid_params
.setpoint
= policy
->setpoint
;
871 static void copy_cpu_funcs(struct pstate_funcs
*funcs
)
873 pstate_funcs
.get_max
= funcs
->get_max
;
874 pstate_funcs
.get_min
= funcs
->get_min
;
875 pstate_funcs
.get_turbo
= funcs
->get_turbo
;
876 pstate_funcs
.set
= funcs
->set
;
877 pstate_funcs
.get_vid
= funcs
->get_vid
;
880 #if IS_ENABLED(CONFIG_ACPI)
881 #include <acpi/processor.h>
883 static bool intel_pstate_no_acpi_pss(void)
887 for_each_possible_cpu(i
) {
889 union acpi_object
*pss
;
890 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
891 struct acpi_processor
*pr
= per_cpu(processors
, i
);
896 status
= acpi_evaluate_object(pr
->handle
, "_PSS", NULL
, &buffer
);
897 if (ACPI_FAILURE(status
))
900 pss
= buffer
.pointer
;
901 if (pss
&& pss
->type
== ACPI_TYPE_PACKAGE
) {
912 struct hw_vendor_info
{
914 char oem_id
[ACPI_OEM_ID_SIZE
];
915 char oem_table_id
[ACPI_OEM_TABLE_ID_SIZE
];
918 /* Hardware vendor-specific info that has its own power management modes */
919 static struct hw_vendor_info vendor_info
[] = {
920 {1, "HP ", "ProLiant"},
924 static bool intel_pstate_platform_pwr_mgmt_exists(void)
926 struct acpi_table_header hdr
;
927 struct hw_vendor_info
*v_info
;
930 || ACPI_FAILURE(acpi_get_table_header(ACPI_SIG_FADT
, 0, &hdr
)))
933 for (v_info
= vendor_info
; v_info
->valid
; v_info
++) {
934 if (!strncmp(hdr
.oem_id
, v_info
->oem_id
, ACPI_OEM_ID_SIZE
)
935 && !strncmp(hdr
.oem_table_id
, v_info
->oem_table_id
, ACPI_OEM_TABLE_ID_SIZE
)
936 && intel_pstate_no_acpi_pss())
942 #else /* CONFIG_ACPI not enabled */
943 static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; }
944 #endif /* CONFIG_ACPI */
946 static int __init
intel_pstate_init(void)
949 const struct x86_cpu_id
*id
;
950 struct cpu_defaults
*cpu_info
;
955 id
= x86_match_cpu(intel_pstate_cpu_ids
);
960 * The Intel pstate driver will be ignored if the platform
961 * firmware has its own power management modes.
963 if (intel_pstate_platform_pwr_mgmt_exists())
966 cpu_info
= (struct cpu_defaults
*)id
->driver_data
;
968 copy_pid_params(&cpu_info
->pid_policy
);
969 copy_cpu_funcs(&cpu_info
->funcs
);
971 if (intel_pstate_msrs_not_valid())
974 pr_info("Intel P-state driver initializing.\n");
976 all_cpu_data
= vzalloc(sizeof(void *) * num_possible_cpus());
980 rc
= cpufreq_register_driver(&intel_pstate_driver
);
984 intel_pstate_debug_expose_params();
985 intel_pstate_sysfs_expose_params();
990 for_each_online_cpu(cpu
) {
991 if (all_cpu_data
[cpu
]) {
992 del_timer_sync(&all_cpu_data
[cpu
]->timer
);
993 kfree(all_cpu_data
[cpu
]);
1001 device_initcall(intel_pstate_init
);
1003 static int __init
intel_pstate_setup(char *str
)
1008 if (!strcmp(str
, "disable"))
1012 early_param("intel_pstate", intel_pstate_setup
);
1014 MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@intel.com>");
1015 MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors");
1016 MODULE_LICENSE("GPL");