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
40 #define int_tofp(X) ((int64_t)(X) << FRAC_BITS)
41 #define fp_toint(X) ((X) >> FRAC_BITS)
43 static inline int32_t mul_fp(int32_t x
, int32_t y
)
45 return ((int64_t)x
* (int64_t)y
) >> FRAC_BITS
;
48 static inline int32_t div_fp(int32_t x
, int32_t y
)
50 return div_s64((int64_t)x
<< FRAC_BITS
, (int64_t)y
);
54 int32_t core_pct_busy
;
82 struct timer_list timer
;
84 struct pstate_data pstate
;
92 struct sample samples
[SAMPLE_COUNT
];
95 static struct cpudata
**all_cpu_data
;
96 struct pstate_adjust_policy
{
105 struct pstate_funcs
{
106 int (*get_max
)(void);
107 int (*get_min
)(void);
108 int (*get_turbo
)(void);
109 void (*set
)(int pstate
);
112 struct cpu_defaults
{
113 struct pstate_adjust_policy pid_policy
;
114 struct pstate_funcs funcs
;
117 static struct pstate_adjust_policy pid_params
;
118 static struct pstate_funcs pstate_funcs
;
130 static struct perf_limits limits
= {
133 .max_perf
= int_tofp(1),
136 .max_policy_pct
= 100,
137 .max_sysfs_pct
= 100,
140 static inline void pid_reset(struct _pid
*pid
, int setpoint
, int busy
,
141 int deadband
, int integral
) {
142 pid
->setpoint
= setpoint
;
143 pid
->deadband
= deadband
;
144 pid
->integral
= int_tofp(integral
);
145 pid
->last_err
= setpoint
- busy
;
148 static inline void pid_p_gain_set(struct _pid
*pid
, int percent
)
150 pid
->p_gain
= div_fp(int_tofp(percent
), int_tofp(100));
153 static inline void pid_i_gain_set(struct _pid
*pid
, int percent
)
155 pid
->i_gain
= div_fp(int_tofp(percent
), int_tofp(100));
158 static inline void pid_d_gain_set(struct _pid
*pid
, int percent
)
161 pid
->d_gain
= div_fp(int_tofp(percent
), int_tofp(100));
164 static signed int pid_calc(struct _pid
*pid
, int32_t busy
)
167 int32_t pterm
, dterm
, fp_error
;
168 int32_t integral_limit
;
170 fp_error
= int_tofp(pid
->setpoint
) - busy
;
172 if (abs(fp_error
) <= int_tofp(pid
->deadband
))
175 pterm
= mul_fp(pid
->p_gain
, fp_error
);
177 pid
->integral
+= fp_error
;
179 /* limit the integral term */
180 integral_limit
= int_tofp(30);
181 if (pid
->integral
> integral_limit
)
182 pid
->integral
= integral_limit
;
183 if (pid
->integral
< -integral_limit
)
184 pid
->integral
= -integral_limit
;
186 dterm
= mul_fp(pid
->d_gain
, fp_error
- pid
->last_err
);
187 pid
->last_err
= fp_error
;
189 result
= pterm
+ mul_fp(pid
->integral
, pid
->i_gain
) + dterm
;
191 return (signed int)fp_toint(result
);
194 static inline void intel_pstate_busy_pid_reset(struct cpudata
*cpu
)
196 pid_p_gain_set(&cpu
->pid
, pid_params
.p_gain_pct
);
197 pid_d_gain_set(&cpu
->pid
, pid_params
.d_gain_pct
);
198 pid_i_gain_set(&cpu
->pid
, pid_params
.i_gain_pct
);
207 static inline void intel_pstate_reset_all_pid(void)
210 for_each_online_cpu(cpu
) {
211 if (all_cpu_data
[cpu
])
212 intel_pstate_busy_pid_reset(all_cpu_data
[cpu
]);
216 /************************** debugfs begin ************************/
217 static int pid_param_set(void *data
, u64 val
)
220 intel_pstate_reset_all_pid();
223 static int pid_param_get(void *data
, u64
*val
)
228 DEFINE_SIMPLE_ATTRIBUTE(fops_pid_param
, pid_param_get
,
229 pid_param_set
, "%llu\n");
236 static struct pid_param pid_files
[] = {
237 {"sample_rate_ms", &pid_params
.sample_rate_ms
},
238 {"d_gain_pct", &pid_params
.d_gain_pct
},
239 {"i_gain_pct", &pid_params
.i_gain_pct
},
240 {"deadband", &pid_params
.deadband
},
241 {"setpoint", &pid_params
.setpoint
},
242 {"p_gain_pct", &pid_params
.p_gain_pct
},
246 static struct dentry
*debugfs_parent
;
247 static void intel_pstate_debug_expose_params(void)
251 debugfs_parent
= debugfs_create_dir("pstate_snb", NULL
);
252 if (IS_ERR_OR_NULL(debugfs_parent
))
254 while (pid_files
[i
].name
) {
255 debugfs_create_file(pid_files
[i
].name
, 0660,
256 debugfs_parent
, pid_files
[i
].value
,
262 /************************** debugfs end ************************/
264 /************************** sysfs begin ************************/
265 #define show_one(file_name, object) \
266 static ssize_t show_##file_name \
267 (struct kobject *kobj, struct attribute *attr, char *buf) \
269 return sprintf(buf, "%u\n", limits.object); \
272 static ssize_t
store_no_turbo(struct kobject
*a
, struct attribute
*b
,
273 const char *buf
, size_t count
)
277 ret
= sscanf(buf
, "%u", &input
);
280 limits
.no_turbo
= clamp_t(int, input
, 0 , 1);
285 static ssize_t
store_max_perf_pct(struct kobject
*a
, struct attribute
*b
,
286 const char *buf
, size_t count
)
290 ret
= sscanf(buf
, "%u", &input
);
294 limits
.max_sysfs_pct
= clamp_t(int, input
, 0 , 100);
295 limits
.max_perf_pct
= min(limits
.max_policy_pct
, limits
.max_sysfs_pct
);
296 limits
.max_perf
= div_fp(int_tofp(limits
.max_perf_pct
), int_tofp(100));
300 static ssize_t
store_min_perf_pct(struct kobject
*a
, struct attribute
*b
,
301 const char *buf
, size_t count
)
305 ret
= sscanf(buf
, "%u", &input
);
308 limits
.min_perf_pct
= clamp_t(int, input
, 0 , 100);
309 limits
.min_perf
= div_fp(int_tofp(limits
.min_perf_pct
), int_tofp(100));
314 show_one(no_turbo
, no_turbo
);
315 show_one(max_perf_pct
, max_perf_pct
);
316 show_one(min_perf_pct
, min_perf_pct
);
318 define_one_global_rw(no_turbo
);
319 define_one_global_rw(max_perf_pct
);
320 define_one_global_rw(min_perf_pct
);
322 static struct attribute
*intel_pstate_attributes
[] = {
329 static struct attribute_group intel_pstate_attr_group
= {
330 .attrs
= intel_pstate_attributes
,
332 static struct kobject
*intel_pstate_kobject
;
334 static void intel_pstate_sysfs_expose_params(void)
338 intel_pstate_kobject
= kobject_create_and_add("intel_pstate",
339 &cpu_subsys
.dev_root
->kobj
);
340 BUG_ON(!intel_pstate_kobject
);
341 rc
= sysfs_create_group(intel_pstate_kobject
,
342 &intel_pstate_attr_group
);
346 /************************** sysfs end ************************/
347 static int byt_get_min_pstate(void)
350 rdmsrl(BYT_RATIOS
, value
);
354 static int byt_get_max_pstate(void)
357 rdmsrl(BYT_RATIOS
, value
);
358 return (value
>> 16) & 0xFF;
361 static int core_get_min_pstate(void)
364 rdmsrl(MSR_PLATFORM_INFO
, value
);
365 return (value
>> 40) & 0xFF;
368 static int core_get_max_pstate(void)
371 rdmsrl(MSR_PLATFORM_INFO
, value
);
372 return (value
>> 8) & 0xFF;
375 static int core_get_turbo_pstate(void)
379 rdmsrl(MSR_NHM_TURBO_RATIO_LIMIT
, value
);
380 nont
= core_get_max_pstate();
381 ret
= ((value
) & 255);
387 static void core_set_pstate(int pstate
)
395 wrmsrl(MSR_IA32_PERF_CTL
, val
);
398 static struct cpu_defaults core_params
= {
400 .sample_rate_ms
= 10,
408 .get_max
= core_get_max_pstate
,
409 .get_min
= core_get_min_pstate
,
410 .get_turbo
= core_get_turbo_pstate
,
411 .set
= core_set_pstate
,
415 static struct cpu_defaults byt_params
= {
417 .sample_rate_ms
= 10,
425 .get_max
= byt_get_max_pstate
,
426 .get_min
= byt_get_min_pstate
,
427 .get_turbo
= byt_get_max_pstate
,
428 .set
= core_set_pstate
,
433 static void intel_pstate_get_min_max(struct cpudata
*cpu
, int *min
, int *max
)
435 int max_perf
= cpu
->pstate
.turbo_pstate
;
439 max_perf
= cpu
->pstate
.max_pstate
;
441 max_perf_adj
= fp_toint(mul_fp(int_tofp(max_perf
), limits
.max_perf
));
442 *max
= clamp_t(int, max_perf_adj
,
443 cpu
->pstate
.min_pstate
, cpu
->pstate
.turbo_pstate
);
445 min_perf
= fp_toint(mul_fp(int_tofp(max_perf
), limits
.min_perf
));
446 *min
= clamp_t(int, min_perf
,
447 cpu
->pstate
.min_pstate
, max_perf
);
450 static void intel_pstate_set_pstate(struct cpudata
*cpu
, int pstate
)
452 int max_perf
, min_perf
;
454 intel_pstate_get_min_max(cpu
, &min_perf
, &max_perf
);
456 pstate
= clamp_t(int, pstate
, min_perf
, max_perf
);
458 if (pstate
== cpu
->pstate
.current_pstate
)
461 trace_cpu_frequency(pstate
* 100000, cpu
->cpu
);
463 cpu
->pstate
.current_pstate
= pstate
;
465 pstate_funcs
.set(pstate
);
468 static inline void intel_pstate_pstate_increase(struct cpudata
*cpu
, int steps
)
471 target
= cpu
->pstate
.current_pstate
+ steps
;
473 intel_pstate_set_pstate(cpu
, target
);
476 static inline void intel_pstate_pstate_decrease(struct cpudata
*cpu
, int steps
)
479 target
= cpu
->pstate
.current_pstate
- steps
;
480 intel_pstate_set_pstate(cpu
, target
);
483 static void intel_pstate_get_cpu_pstates(struct cpudata
*cpu
)
485 sprintf(cpu
->name
, "Intel 2nd generation core");
487 cpu
->pstate
.min_pstate
= pstate_funcs
.get_min();
488 cpu
->pstate
.max_pstate
= pstate_funcs
.get_max();
489 cpu
->pstate
.turbo_pstate
= pstate_funcs
.get_turbo();
492 * goto max pstate so we don't slow up boot if we are built-in if we are
493 * a module we will take care of it during normal operation
495 intel_pstate_set_pstate(cpu
, cpu
->pstate
.max_pstate
);
498 static inline void intel_pstate_calc_busy(struct cpudata
*cpu
,
499 struct sample
*sample
)
502 core_pct
= div64_u64(int_tofp(sample
->aperf
* 100),
504 sample
->freq
= fp_toint(cpu
->pstate
.max_pstate
* core_pct
* 1000);
506 sample
->core_pct_busy
= core_pct
;
509 static inline void intel_pstate_sample(struct cpudata
*cpu
)
513 rdmsrl(MSR_IA32_APERF
, aperf
);
514 rdmsrl(MSR_IA32_MPERF
, mperf
);
515 cpu
->sample_ptr
= (cpu
->sample_ptr
+ 1) % SAMPLE_COUNT
;
516 cpu
->samples
[cpu
->sample_ptr
].aperf
= aperf
;
517 cpu
->samples
[cpu
->sample_ptr
].mperf
= mperf
;
518 cpu
->samples
[cpu
->sample_ptr
].aperf
-= cpu
->prev_aperf
;
519 cpu
->samples
[cpu
->sample_ptr
].mperf
-= cpu
->prev_mperf
;
521 intel_pstate_calc_busy(cpu
, &cpu
->samples
[cpu
->sample_ptr
]);
523 cpu
->prev_aperf
= aperf
;
524 cpu
->prev_mperf
= mperf
;
527 static inline void intel_pstate_set_sample_time(struct cpudata
*cpu
)
529 int sample_time
, delay
;
531 sample_time
= pid_params
.sample_rate_ms
;
532 delay
= msecs_to_jiffies(sample_time
);
533 mod_timer_pinned(&cpu
->timer
, jiffies
+ delay
);
536 static inline int32_t intel_pstate_get_scaled_busy(struct cpudata
*cpu
)
538 int32_t core_busy
, max_pstate
, current_pstate
;
540 core_busy
= cpu
->samples
[cpu
->sample_ptr
].core_pct_busy
;
541 max_pstate
= int_tofp(cpu
->pstate
.max_pstate
);
542 current_pstate
= int_tofp(cpu
->pstate
.current_pstate
);
543 return mul_fp(core_busy
, div_fp(max_pstate
, current_pstate
));
546 static inline void intel_pstate_adjust_busy_pstate(struct cpudata
*cpu
)
554 busy_scaled
= intel_pstate_get_scaled_busy(cpu
);
556 ctl
= pid_calc(pid
, busy_scaled
);
560 intel_pstate_pstate_increase(cpu
, steps
);
562 intel_pstate_pstate_decrease(cpu
, steps
);
565 static void intel_pstate_timer_func(unsigned long __data
)
567 struct cpudata
*cpu
= (struct cpudata
*) __data
;
569 intel_pstate_sample(cpu
);
570 intel_pstate_adjust_busy_pstate(cpu
);
572 if (cpu
->pstate
.current_pstate
== cpu
->pstate
.min_pstate
) {
573 cpu
->min_pstate_count
++;
574 if (!(cpu
->min_pstate_count
% 5)) {
575 intel_pstate_set_pstate(cpu
, cpu
->pstate
.max_pstate
);
578 cpu
->min_pstate_count
= 0;
580 intel_pstate_set_sample_time(cpu
);
583 #define ICPU(model, policy) \
584 { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, (unsigned long)&policy }
586 static const struct x86_cpu_id intel_pstate_cpu_ids
[] = {
587 ICPU(0x2a, core_params
),
588 ICPU(0x2d, core_params
),
589 ICPU(0x37, byt_params
),
590 ICPU(0x3a, core_params
),
591 ICPU(0x3c, core_params
),
592 ICPU(0x3e, core_params
),
593 ICPU(0x3f, core_params
),
594 ICPU(0x45, core_params
),
595 ICPU(0x46, core_params
),
598 MODULE_DEVICE_TABLE(x86cpu
, intel_pstate_cpu_ids
);
600 static int intel_pstate_init_cpu(unsigned int cpunum
)
603 const struct x86_cpu_id
*id
;
606 id
= x86_match_cpu(intel_pstate_cpu_ids
);
610 all_cpu_data
[cpunum
] = kzalloc(sizeof(struct cpudata
), GFP_KERNEL
);
611 if (!all_cpu_data
[cpunum
])
614 cpu
= all_cpu_data
[cpunum
];
616 intel_pstate_get_cpu_pstates(cpu
);
620 init_timer_deferrable(&cpu
->timer
);
621 cpu
->timer
.function
= intel_pstate_timer_func
;
624 cpu
->timer
.expires
= jiffies
+ HZ
/100;
625 intel_pstate_busy_pid_reset(cpu
);
626 intel_pstate_sample(cpu
);
627 intel_pstate_set_pstate(cpu
, cpu
->pstate
.max_pstate
);
629 add_timer_on(&cpu
->timer
, cpunum
);
631 pr_info("Intel pstate controlling: cpu %d\n", cpunum
);
636 static unsigned int intel_pstate_get(unsigned int cpu_num
)
638 struct sample
*sample
;
641 cpu
= all_cpu_data
[cpu_num
];
644 sample
= &cpu
->samples
[cpu
->sample_ptr
];
648 static int intel_pstate_set_policy(struct cpufreq_policy
*policy
)
652 cpu
= all_cpu_data
[policy
->cpu
];
654 if (!policy
->cpuinfo
.max_freq
)
657 if (policy
->policy
== CPUFREQ_POLICY_PERFORMANCE
) {
658 limits
.min_perf_pct
= 100;
659 limits
.min_perf
= int_tofp(1);
660 limits
.max_perf_pct
= 100;
661 limits
.max_perf
= int_tofp(1);
665 limits
.min_perf_pct
= (policy
->min
* 100) / policy
->cpuinfo
.max_freq
;
666 limits
.min_perf_pct
= clamp_t(int, limits
.min_perf_pct
, 0 , 100);
667 limits
.min_perf
= div_fp(int_tofp(limits
.min_perf_pct
), int_tofp(100));
669 limits
.max_policy_pct
= policy
->max
* 100 / policy
->cpuinfo
.max_freq
;
670 limits
.max_policy_pct
= clamp_t(int, limits
.max_policy_pct
, 0 , 100);
671 limits
.max_perf_pct
= min(limits
.max_policy_pct
, limits
.max_sysfs_pct
);
672 limits
.max_perf
= div_fp(int_tofp(limits
.max_perf_pct
), int_tofp(100));
677 static int intel_pstate_verify_policy(struct cpufreq_policy
*policy
)
679 cpufreq_verify_within_cpu_limits(policy
);
681 if ((policy
->policy
!= CPUFREQ_POLICY_POWERSAVE
) &&
682 (policy
->policy
!= CPUFREQ_POLICY_PERFORMANCE
))
688 static int intel_pstate_cpu_exit(struct cpufreq_policy
*policy
)
690 int cpu
= policy
->cpu
;
692 del_timer(&all_cpu_data
[cpu
]->timer
);
693 kfree(all_cpu_data
[cpu
]);
694 all_cpu_data
[cpu
] = NULL
;
698 static int intel_pstate_cpu_init(struct cpufreq_policy
*policy
)
703 rc
= intel_pstate_init_cpu(policy
->cpu
);
707 cpu
= all_cpu_data
[policy
->cpu
];
709 if (!limits
.no_turbo
&&
710 limits
.min_perf_pct
== 100 && limits
.max_perf_pct
== 100)
711 policy
->policy
= CPUFREQ_POLICY_PERFORMANCE
;
713 policy
->policy
= CPUFREQ_POLICY_POWERSAVE
;
715 policy
->min
= cpu
->pstate
.min_pstate
* 100000;
716 policy
->max
= cpu
->pstate
.turbo_pstate
* 100000;
718 /* cpuinfo and default policy values */
719 policy
->cpuinfo
.min_freq
= cpu
->pstate
.min_pstate
* 100000;
720 policy
->cpuinfo
.max_freq
= cpu
->pstate
.turbo_pstate
* 100000;
721 policy
->cpuinfo
.transition_latency
= CPUFREQ_ETERNAL
;
722 cpumask_set_cpu(policy
->cpu
, policy
->cpus
);
727 static struct cpufreq_driver intel_pstate_driver
= {
728 .flags
= CPUFREQ_CONST_LOOPS
,
729 .verify
= intel_pstate_verify_policy
,
730 .setpolicy
= intel_pstate_set_policy
,
731 .get
= intel_pstate_get
,
732 .init
= intel_pstate_cpu_init
,
733 .exit
= intel_pstate_cpu_exit
,
734 .name
= "intel_pstate",
737 static int __initdata no_load
;
739 static int intel_pstate_msrs_not_valid(void)
741 /* Check that all the msr's we are using are valid. */
742 u64 aperf
, mperf
, tmp
;
744 rdmsrl(MSR_IA32_APERF
, aperf
);
745 rdmsrl(MSR_IA32_MPERF
, mperf
);
747 if (!pstate_funcs
.get_max() ||
748 !pstate_funcs
.get_min() ||
749 !pstate_funcs
.get_turbo())
752 rdmsrl(MSR_IA32_APERF
, tmp
);
756 rdmsrl(MSR_IA32_MPERF
, tmp
);
763 static void copy_pid_params(struct pstate_adjust_policy
*policy
)
765 pid_params
.sample_rate_ms
= policy
->sample_rate_ms
;
766 pid_params
.p_gain_pct
= policy
->p_gain_pct
;
767 pid_params
.i_gain_pct
= policy
->i_gain_pct
;
768 pid_params
.d_gain_pct
= policy
->d_gain_pct
;
769 pid_params
.deadband
= policy
->deadband
;
770 pid_params
.setpoint
= policy
->setpoint
;
773 static void copy_cpu_funcs(struct pstate_funcs
*funcs
)
775 pstate_funcs
.get_max
= funcs
->get_max
;
776 pstate_funcs
.get_min
= funcs
->get_min
;
777 pstate_funcs
.get_turbo
= funcs
->get_turbo
;
778 pstate_funcs
.set
= funcs
->set
;
781 #if IS_ENABLED(CONFIG_ACPI)
782 #include <acpi/processor.h>
784 static bool intel_pstate_no_acpi_pss(void)
788 for_each_possible_cpu(i
) {
790 union acpi_object
*pss
;
791 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
792 struct acpi_processor
*pr
= per_cpu(processors
, i
);
797 status
= acpi_evaluate_object(pr
->handle
, "_PSS", NULL
, &buffer
);
798 if (ACPI_FAILURE(status
))
801 pss
= buffer
.pointer
;
802 if (pss
&& pss
->type
== ACPI_TYPE_PACKAGE
) {
813 struct hw_vendor_info
{
815 char oem_id
[ACPI_OEM_ID_SIZE
];
816 char oem_table_id
[ACPI_OEM_TABLE_ID_SIZE
];
819 /* Hardware vendor-specific info that has its own power management modes */
820 static struct hw_vendor_info vendor_info
[] = {
821 {1, "HP ", "ProLiant"},
825 static bool intel_pstate_platform_pwr_mgmt_exists(void)
827 struct acpi_table_header hdr
;
828 struct hw_vendor_info
*v_info
;
831 || ACPI_FAILURE(acpi_get_table_header(ACPI_SIG_FADT
, 0, &hdr
)))
834 for (v_info
= vendor_info
; v_info
->valid
; v_info
++) {
835 if (!strncmp(hdr
.oem_id
, v_info
->oem_id
, ACPI_OEM_ID_SIZE
)
836 && !strncmp(hdr
.oem_table_id
, v_info
->oem_table_id
, ACPI_OEM_TABLE_ID_SIZE
)
837 && intel_pstate_no_acpi_pss())
843 #else /* CONFIG_ACPI not enabled */
844 static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; }
845 #endif /* CONFIG_ACPI */
847 static int __init
intel_pstate_init(void)
850 const struct x86_cpu_id
*id
;
851 struct cpu_defaults
*cpu_info
;
856 id
= x86_match_cpu(intel_pstate_cpu_ids
);
861 * The Intel pstate driver will be ignored if the platform
862 * firmware has its own power management modes.
864 if (intel_pstate_platform_pwr_mgmt_exists())
867 cpu_info
= (struct cpu_defaults
*)id
->driver_data
;
869 copy_pid_params(&cpu_info
->pid_policy
);
870 copy_cpu_funcs(&cpu_info
->funcs
);
872 if (intel_pstate_msrs_not_valid())
875 pr_info("Intel P-state driver initializing.\n");
877 all_cpu_data
= vzalloc(sizeof(void *) * num_possible_cpus());
881 rc
= cpufreq_register_driver(&intel_pstate_driver
);
885 intel_pstate_debug_expose_params();
886 intel_pstate_sysfs_expose_params();
890 for_each_online_cpu(cpu
) {
891 if (all_cpu_data
[cpu
]) {
892 del_timer_sync(&all_cpu_data
[cpu
]->timer
);
893 kfree(all_cpu_data
[cpu
]);
901 device_initcall(intel_pstate_init
);
903 static int __init
intel_pstate_setup(char *str
)
908 if (!strcmp(str
, "disable"))
912 early_param("intel_pstate", intel_pstate_setup
);
914 MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@intel.com>");
915 MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors");
916 MODULE_LICENSE("GPL");