2 * acpi-cpufreq.c - ACPI Processor P-States Driver
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 * Copyright (C) 2002 - 2004 Dominik Brodowski <linux@brodo.de>
7 * Copyright (C) 2006 Denis Sadykov <denis.m.sadykov@intel.com>
9 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or (at
14 * your option) any later version.
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
21 * You should have received a copy of the GNU General Public License along
22 * with this program; if not, write to the Free Software Foundation, Inc.,
23 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
25 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
28 #include <linux/kernel.h>
29 #include <linux/module.h>
30 #include <linux/init.h>
31 #include <linux/smp.h>
32 #include <linux/sched.h>
33 #include <linux/cpufreq.h>
34 #include <linux/compiler.h>
35 #include <linux/dmi.h>
36 #include <linux/slab.h>
38 #include <linux/acpi.h>
40 #include <linux/delay.h>
41 #include <linux/uaccess.h>
43 #include <acpi/processor.h>
46 #include <asm/processor.h>
47 #include <asm/cpufeature.h>
49 MODULE_AUTHOR("Paul Diefenbaugh, Dominik Brodowski");
50 MODULE_DESCRIPTION("ACPI Processor P-States Driver");
51 MODULE_LICENSE("GPL");
53 #define PFX "acpi-cpufreq: "
56 UNDEFINED_CAPABLE
= 0,
57 SYSTEM_INTEL_MSR_CAPABLE
,
58 SYSTEM_AMD_MSR_CAPABLE
,
62 #define INTEL_MSR_RANGE (0xffff)
63 #define AMD_MSR_RANGE (0x7)
65 #define MSR_K7_HWCR_CPB_DIS (1ULL << 25)
67 struct acpi_cpufreq_data
{
68 struct acpi_processor_performance
*acpi_data
;
69 struct cpufreq_frequency_table
*freq_table
;
71 unsigned int cpu_feature
;
72 cpumask_var_t freqdomain_cpus
;
75 static DEFINE_PER_CPU(struct acpi_cpufreq_data
*, acfreq_data
);
77 /* acpi_perf_data is a pointer to percpu data. */
78 static struct acpi_processor_performance __percpu
*acpi_perf_data
;
80 static struct cpufreq_driver acpi_cpufreq_driver
;
82 static unsigned int acpi_pstate_strict
;
83 static bool boost_enabled
, boost_supported
;
84 static struct msr __percpu
*msrs
;
86 static bool boost_state(unsigned int cpu
)
91 switch (boot_cpu_data
.x86_vendor
) {
92 case X86_VENDOR_INTEL
:
93 rdmsr_on_cpu(cpu
, MSR_IA32_MISC_ENABLE
, &lo
, &hi
);
94 msr
= lo
| ((u64
)hi
<< 32);
95 return !(msr
& MSR_IA32_MISC_ENABLE_TURBO_DISABLE
);
97 rdmsr_on_cpu(cpu
, MSR_K7_HWCR
, &lo
, &hi
);
98 msr
= lo
| ((u64
)hi
<< 32);
99 return !(msr
& MSR_K7_HWCR_CPB_DIS
);
104 static void boost_set_msrs(bool enable
, const struct cpumask
*cpumask
)
110 switch (boot_cpu_data
.x86_vendor
) {
111 case X86_VENDOR_INTEL
:
112 msr_addr
= MSR_IA32_MISC_ENABLE
;
113 msr_mask
= MSR_IA32_MISC_ENABLE_TURBO_DISABLE
;
116 msr_addr
= MSR_K7_HWCR
;
117 msr_mask
= MSR_K7_HWCR_CPB_DIS
;
123 rdmsr_on_cpus(cpumask
, msr_addr
, msrs
);
125 for_each_cpu(cpu
, cpumask
) {
126 struct msr
*reg
= per_cpu_ptr(msrs
, cpu
);
133 wrmsr_on_cpus(cpumask
, msr_addr
, msrs
);
136 static ssize_t
_store_boost(const char *buf
, size_t count
)
139 unsigned long val
= 0;
141 if (!boost_supported
)
144 ret
= kstrtoul(buf
, 10, &val
);
145 if (ret
|| (val
> 1))
148 if ((val
&& boost_enabled
) || (!val
&& !boost_enabled
))
153 boost_set_msrs(val
, cpu_online_mask
);
158 pr_debug("Core Boosting %sabled.\n", val
? "en" : "dis");
163 static ssize_t
store_global_boost(struct kobject
*kobj
, struct attribute
*attr
,
164 const char *buf
, size_t count
)
166 return _store_boost(buf
, count
);
169 static ssize_t
show_global_boost(struct kobject
*kobj
,
170 struct attribute
*attr
, char *buf
)
172 return sprintf(buf
, "%u\n", boost_enabled
);
175 static struct global_attr global_boost
= __ATTR(boost
, 0644,
179 static ssize_t
show_freqdomain_cpus(struct cpufreq_policy
*policy
, char *buf
)
181 struct acpi_cpufreq_data
*data
= per_cpu(acfreq_data
, policy
->cpu
);
183 return cpufreq_show_cpus(data
->freqdomain_cpus
, buf
);
186 cpufreq_freq_attr_ro(freqdomain_cpus
);
188 #ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
189 static ssize_t
store_cpb(struct cpufreq_policy
*policy
, const char *buf
,
192 return _store_boost(buf
, count
);
195 static ssize_t
show_cpb(struct cpufreq_policy
*policy
, char *buf
)
197 return sprintf(buf
, "%u\n", boost_enabled
);
200 cpufreq_freq_attr_rw(cpb
);
203 static int check_est_cpu(unsigned int cpuid
)
205 struct cpuinfo_x86
*cpu
= &cpu_data(cpuid
);
207 return cpu_has(cpu
, X86_FEATURE_EST
);
210 static int check_amd_hwpstate_cpu(unsigned int cpuid
)
212 struct cpuinfo_x86
*cpu
= &cpu_data(cpuid
);
214 return cpu_has(cpu
, X86_FEATURE_HW_PSTATE
);
217 static unsigned extract_io(u32 value
, struct acpi_cpufreq_data
*data
)
219 struct acpi_processor_performance
*perf
;
222 perf
= data
->acpi_data
;
224 for (i
= 0; i
< perf
->state_count
; i
++) {
225 if (value
== perf
->states
[i
].status
)
226 return data
->freq_table
[i
].frequency
;
231 static unsigned extract_msr(u32 msr
, struct acpi_cpufreq_data
*data
)
234 struct acpi_processor_performance
*perf
;
236 if (boot_cpu_data
.x86_vendor
== X86_VENDOR_AMD
)
237 msr
&= AMD_MSR_RANGE
;
239 msr
&= INTEL_MSR_RANGE
;
241 perf
= data
->acpi_data
;
243 for (i
= 0; data
->freq_table
[i
].frequency
!= CPUFREQ_TABLE_END
; i
++) {
244 if (msr
== perf
->states
[data
->freq_table
[i
].driver_data
].status
)
245 return data
->freq_table
[i
].frequency
;
247 return data
->freq_table
[0].frequency
;
250 static unsigned extract_freq(u32 val
, struct acpi_cpufreq_data
*data
)
252 switch (data
->cpu_feature
) {
253 case SYSTEM_INTEL_MSR_CAPABLE
:
254 case SYSTEM_AMD_MSR_CAPABLE
:
255 return extract_msr(val
, data
);
256 case SYSTEM_IO_CAPABLE
:
257 return extract_io(val
, data
);
274 const struct cpumask
*mask
;
282 /* Called via smp_call_function_single(), on the target CPU */
283 static void do_drv_read(void *_cmd
)
285 struct drv_cmd
*cmd
= _cmd
;
289 case SYSTEM_INTEL_MSR_CAPABLE
:
290 case SYSTEM_AMD_MSR_CAPABLE
:
291 rdmsr(cmd
->addr
.msr
.reg
, cmd
->val
, h
);
293 case SYSTEM_IO_CAPABLE
:
294 acpi_os_read_port((acpi_io_address
)cmd
->addr
.io
.port
,
296 (u32
)cmd
->addr
.io
.bit_width
);
303 /* Called via smp_call_function_many(), on the target CPUs */
304 static void do_drv_write(void *_cmd
)
306 struct drv_cmd
*cmd
= _cmd
;
310 case SYSTEM_INTEL_MSR_CAPABLE
:
311 rdmsr(cmd
->addr
.msr
.reg
, lo
, hi
);
312 lo
= (lo
& ~INTEL_MSR_RANGE
) | (cmd
->val
& INTEL_MSR_RANGE
);
313 wrmsr(cmd
->addr
.msr
.reg
, lo
, hi
);
315 case SYSTEM_AMD_MSR_CAPABLE
:
316 wrmsr(cmd
->addr
.msr
.reg
, cmd
->val
, 0);
318 case SYSTEM_IO_CAPABLE
:
319 acpi_os_write_port((acpi_io_address
)cmd
->addr
.io
.port
,
321 (u32
)cmd
->addr
.io
.bit_width
);
328 static void drv_read(struct drv_cmd
*cmd
)
333 err
= smp_call_function_any(cmd
->mask
, do_drv_read
, cmd
, 1);
334 WARN_ON_ONCE(err
); /* smp_call_function_any() was buggy? */
337 static void drv_write(struct drv_cmd
*cmd
)
341 this_cpu
= get_cpu();
342 if (cpumask_test_cpu(this_cpu
, cmd
->mask
))
344 smp_call_function_many(cmd
->mask
, do_drv_write
, cmd
, 1);
348 static u32
get_cur_val(const struct cpumask
*mask
)
350 struct acpi_processor_performance
*perf
;
353 if (unlikely(cpumask_empty(mask
)))
356 switch (per_cpu(acfreq_data
, cpumask_first(mask
))->cpu_feature
) {
357 case SYSTEM_INTEL_MSR_CAPABLE
:
358 cmd
.type
= SYSTEM_INTEL_MSR_CAPABLE
;
359 cmd
.addr
.msr
.reg
= MSR_IA32_PERF_CTL
;
361 case SYSTEM_AMD_MSR_CAPABLE
:
362 cmd
.type
= SYSTEM_AMD_MSR_CAPABLE
;
363 cmd
.addr
.msr
.reg
= MSR_AMD_PERF_CTL
;
365 case SYSTEM_IO_CAPABLE
:
366 cmd
.type
= SYSTEM_IO_CAPABLE
;
367 perf
= per_cpu(acfreq_data
, cpumask_first(mask
))->acpi_data
;
368 cmd
.addr
.io
.port
= perf
->control_register
.address
;
369 cmd
.addr
.io
.bit_width
= perf
->control_register
.bit_width
;
378 pr_debug("get_cur_val = %u\n", cmd
.val
);
383 static unsigned int get_cur_freq_on_cpu(unsigned int cpu
)
385 struct acpi_cpufreq_data
*data
= per_cpu(acfreq_data
, cpu
);
387 unsigned int cached_freq
;
389 pr_debug("get_cur_freq_on_cpu (%d)\n", cpu
);
391 if (unlikely(data
== NULL
||
392 data
->acpi_data
== NULL
|| data
->freq_table
== NULL
)) {
396 cached_freq
= data
->freq_table
[data
->acpi_data
->state
].frequency
;
397 freq
= extract_freq(get_cur_val(cpumask_of(cpu
)), data
);
398 if (freq
!= cached_freq
) {
400 * The dreaded BIOS frequency change behind our back.
401 * Force set the frequency on next target call.
406 pr_debug("cur freq = %u\n", freq
);
411 static unsigned int check_freqs(const struct cpumask
*mask
, unsigned int freq
,
412 struct acpi_cpufreq_data
*data
)
414 unsigned int cur_freq
;
417 for (i
= 0; i
< 100; i
++) {
418 cur_freq
= extract_freq(get_cur_val(mask
), data
);
419 if (cur_freq
== freq
)
426 static int acpi_cpufreq_target(struct cpufreq_policy
*policy
,
429 struct acpi_cpufreq_data
*data
= per_cpu(acfreq_data
, policy
->cpu
);
430 struct acpi_processor_performance
*perf
;
432 unsigned int next_perf_state
= 0; /* Index into perf table */
435 if (unlikely(data
== NULL
||
436 data
->acpi_data
== NULL
|| data
->freq_table
== NULL
)) {
440 perf
= data
->acpi_data
;
441 next_perf_state
= data
->freq_table
[index
].driver_data
;
442 if (perf
->state
== next_perf_state
) {
443 if (unlikely(data
->resume
)) {
444 pr_debug("Called after resume, resetting to P%d\n",
448 pr_debug("Already at target state (P%d)\n",
454 switch (data
->cpu_feature
) {
455 case SYSTEM_INTEL_MSR_CAPABLE
:
456 cmd
.type
= SYSTEM_INTEL_MSR_CAPABLE
;
457 cmd
.addr
.msr
.reg
= MSR_IA32_PERF_CTL
;
458 cmd
.val
= (u32
) perf
->states
[next_perf_state
].control
;
460 case SYSTEM_AMD_MSR_CAPABLE
:
461 cmd
.type
= SYSTEM_AMD_MSR_CAPABLE
;
462 cmd
.addr
.msr
.reg
= MSR_AMD_PERF_CTL
;
463 cmd
.val
= (u32
) perf
->states
[next_perf_state
].control
;
465 case SYSTEM_IO_CAPABLE
:
466 cmd
.type
= SYSTEM_IO_CAPABLE
;
467 cmd
.addr
.io
.port
= perf
->control_register
.address
;
468 cmd
.addr
.io
.bit_width
= perf
->control_register
.bit_width
;
469 cmd
.val
= (u32
) perf
->states
[next_perf_state
].control
;
476 /* cpufreq holds the hotplug lock, so we are safe from here on */
477 if (policy
->shared_type
!= CPUFREQ_SHARED_TYPE_ANY
)
478 cmd
.mask
= policy
->cpus
;
480 cmd
.mask
= cpumask_of(policy
->cpu
);
484 if (acpi_pstate_strict
) {
485 if (!check_freqs(cmd
.mask
, data
->freq_table
[index
].frequency
,
487 pr_debug("acpi_cpufreq_target failed (%d)\n",
494 perf
->state
= next_perf_state
;
501 acpi_cpufreq_guess_freq(struct acpi_cpufreq_data
*data
, unsigned int cpu
)
503 struct acpi_processor_performance
*perf
= data
->acpi_data
;
506 /* search the closest match to cpu_khz */
509 unsigned long freqn
= perf
->states
[0].core_frequency
* 1000;
511 for (i
= 0; i
< (perf
->state_count
-1); i
++) {
513 freqn
= perf
->states
[i
+1].core_frequency
* 1000;
514 if ((2 * cpu_khz
) > (freqn
+ freq
)) {
519 perf
->state
= perf
->state_count
-1;
522 /* assume CPU is at P0... */
524 return perf
->states
[0].core_frequency
* 1000;
528 static void free_acpi_perf_data(void)
532 /* Freeing a NULL pointer is OK, and alloc_percpu zeroes. */
533 for_each_possible_cpu(i
)
534 free_cpumask_var(per_cpu_ptr(acpi_perf_data
, i
)
536 free_percpu(acpi_perf_data
);
539 static int boost_notify(struct notifier_block
*nb
, unsigned long action
,
542 unsigned cpu
= (long)hcpu
;
543 const struct cpumask
*cpumask
;
545 cpumask
= get_cpu_mask(cpu
);
548 * Clear the boost-disable bit on the CPU_DOWN path so that
549 * this cpu cannot block the remaining ones from boosting. On
550 * the CPU_UP path we simply keep the boost-disable flag in
551 * sync with the current global state.
556 case CPU_UP_PREPARE_FROZEN
:
557 boost_set_msrs(boost_enabled
, cpumask
);
560 case CPU_DOWN_PREPARE
:
561 case CPU_DOWN_PREPARE_FROZEN
:
562 boost_set_msrs(1, cpumask
);
573 static struct notifier_block boost_nb
= {
574 .notifier_call
= boost_notify
,
578 * acpi_cpufreq_early_init - initialize ACPI P-States library
580 * Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c)
581 * in order to determine correct frequency and voltage pairings. We can
582 * do _PDC and _PSD and find out the processor dependency for the
583 * actual init that will happen later...
585 static int __init
acpi_cpufreq_early_init(void)
588 pr_debug("acpi_cpufreq_early_init\n");
590 acpi_perf_data
= alloc_percpu(struct acpi_processor_performance
);
591 if (!acpi_perf_data
) {
592 pr_debug("Memory allocation error for acpi_perf_data.\n");
595 for_each_possible_cpu(i
) {
596 if (!zalloc_cpumask_var_node(
597 &per_cpu_ptr(acpi_perf_data
, i
)->shared_cpu_map
,
598 GFP_KERNEL
, cpu_to_node(i
))) {
600 /* Freeing a NULL pointer is OK: alloc_percpu zeroes. */
601 free_acpi_perf_data();
606 /* Do initialization in ACPI core */
607 acpi_processor_preregister_performance(acpi_perf_data
);
613 * Some BIOSes do SW_ANY coordination internally, either set it up in hw
614 * or do it in BIOS firmware and won't inform about it to OS. If not
615 * detected, this has a side effect of making CPU run at a different speed
616 * than OS intended it to run at. Detect it and handle it cleanly.
618 static int bios_with_sw_any_bug
;
620 static int sw_any_bug_found(const struct dmi_system_id
*d
)
622 bios_with_sw_any_bug
= 1;
626 static const struct dmi_system_id sw_any_bug_dmi_table
[] = {
628 .callback
= sw_any_bug_found
,
629 .ident
= "Supermicro Server X6DLP",
631 DMI_MATCH(DMI_SYS_VENDOR
, "Supermicro"),
632 DMI_MATCH(DMI_BIOS_VERSION
, "080010"),
633 DMI_MATCH(DMI_PRODUCT_NAME
, "X6DLP"),
639 static int acpi_cpufreq_blacklist(struct cpuinfo_x86
*c
)
641 /* Intel Xeon Processor 7100 Series Specification Update
642 * http://www.intel.com/Assets/PDF/specupdate/314554.pdf
643 * AL30: A Machine Check Exception (MCE) Occurring during an
644 * Enhanced Intel SpeedStep Technology Ratio Change May Cause
645 * Both Processor Cores to Lock Up. */
646 if (c
->x86_vendor
== X86_VENDOR_INTEL
) {
647 if ((c
->x86
== 15) &&
648 (c
->x86_model
== 6) &&
649 (c
->x86_mask
== 8)) {
650 printk(KERN_INFO
"acpi-cpufreq: Intel(R) "
651 "Xeon(R) 7100 Errata AL30, processors may "
652 "lock up on frequency changes: disabling "
661 static int acpi_cpufreq_cpu_init(struct cpufreq_policy
*policy
)
664 unsigned int valid_states
= 0;
665 unsigned int cpu
= policy
->cpu
;
666 struct acpi_cpufreq_data
*data
;
667 unsigned int result
= 0;
668 struct cpuinfo_x86
*c
= &cpu_data(policy
->cpu
);
669 struct acpi_processor_performance
*perf
;
671 static int blacklisted
;
674 pr_debug("acpi_cpufreq_cpu_init\n");
679 blacklisted
= acpi_cpufreq_blacklist(c
);
684 data
= kzalloc(sizeof(*data
), GFP_KERNEL
);
688 if (!zalloc_cpumask_var(&data
->freqdomain_cpus
, GFP_KERNEL
)) {
693 data
->acpi_data
= per_cpu_ptr(acpi_perf_data
, cpu
);
694 per_cpu(acfreq_data
, cpu
) = data
;
696 if (cpu_has(c
, X86_FEATURE_CONSTANT_TSC
))
697 acpi_cpufreq_driver
.flags
|= CPUFREQ_CONST_LOOPS
;
699 result
= acpi_processor_register_performance(data
->acpi_data
, cpu
);
703 perf
= data
->acpi_data
;
704 policy
->shared_type
= perf
->shared_type
;
707 * Will let policy->cpus know about dependency only when software
708 * coordination is required.
710 if (policy
->shared_type
== CPUFREQ_SHARED_TYPE_ALL
||
711 policy
->shared_type
== CPUFREQ_SHARED_TYPE_ANY
) {
712 cpumask_copy(policy
->cpus
, perf
->shared_cpu_map
);
714 cpumask_copy(data
->freqdomain_cpus
, perf
->shared_cpu_map
);
717 dmi_check_system(sw_any_bug_dmi_table
);
718 if (bios_with_sw_any_bug
&& !policy_is_shared(policy
)) {
719 policy
->shared_type
= CPUFREQ_SHARED_TYPE_ALL
;
720 cpumask_copy(policy
->cpus
, cpu_core_mask(cpu
));
723 if (check_amd_hwpstate_cpu(cpu
) && !acpi_pstate_strict
) {
724 cpumask_clear(policy
->cpus
);
725 cpumask_set_cpu(cpu
, policy
->cpus
);
726 cpumask_copy(data
->freqdomain_cpus
, cpu_sibling_mask(cpu
));
727 policy
->shared_type
= CPUFREQ_SHARED_TYPE_HW
;
728 pr_info_once(PFX
"overriding BIOS provided _PSD data\n");
732 /* capability check */
733 if (perf
->state_count
<= 1) {
734 pr_debug("No P-States\n");
739 if (perf
->control_register
.space_id
!= perf
->status_register
.space_id
) {
744 switch (perf
->control_register
.space_id
) {
745 case ACPI_ADR_SPACE_SYSTEM_IO
:
746 if (boot_cpu_data
.x86_vendor
== X86_VENDOR_AMD
&&
747 boot_cpu_data
.x86
== 0xf) {
748 pr_debug("AMD K8 systems must use native drivers.\n");
752 pr_debug("SYSTEM IO addr space\n");
753 data
->cpu_feature
= SYSTEM_IO_CAPABLE
;
755 case ACPI_ADR_SPACE_FIXED_HARDWARE
:
756 pr_debug("HARDWARE addr space\n");
757 if (check_est_cpu(cpu
)) {
758 data
->cpu_feature
= SYSTEM_INTEL_MSR_CAPABLE
;
761 if (check_amd_hwpstate_cpu(cpu
)) {
762 data
->cpu_feature
= SYSTEM_AMD_MSR_CAPABLE
;
768 pr_debug("Unknown addr space %d\n",
769 (u32
) (perf
->control_register
.space_id
));
774 data
->freq_table
= kmalloc(sizeof(*data
->freq_table
) *
775 (perf
->state_count
+1), GFP_KERNEL
);
776 if (!data
->freq_table
) {
781 /* detect transition latency */
782 policy
->cpuinfo
.transition_latency
= 0;
783 for (i
= 0; i
< perf
->state_count
; i
++) {
784 if ((perf
->states
[i
].transition_latency
* 1000) >
785 policy
->cpuinfo
.transition_latency
)
786 policy
->cpuinfo
.transition_latency
=
787 perf
->states
[i
].transition_latency
* 1000;
790 /* Check for high latency (>20uS) from buggy BIOSes, like on T42 */
791 if (perf
->control_register
.space_id
== ACPI_ADR_SPACE_FIXED_HARDWARE
&&
792 policy
->cpuinfo
.transition_latency
> 20 * 1000) {
793 policy
->cpuinfo
.transition_latency
= 20 * 1000;
794 printk_once(KERN_INFO
795 "P-state transition latency capped at 20 uS\n");
799 for (i
= 0; i
< perf
->state_count
; i
++) {
800 if (i
> 0 && perf
->states
[i
].core_frequency
>=
801 data
->freq_table
[valid_states
-1].frequency
/ 1000)
804 data
->freq_table
[valid_states
].driver_data
= i
;
805 data
->freq_table
[valid_states
].frequency
=
806 perf
->states
[i
].core_frequency
* 1000;
809 data
->freq_table
[valid_states
].frequency
= CPUFREQ_TABLE_END
;
812 result
= cpufreq_table_validate_and_show(policy
, data
->freq_table
);
816 if (perf
->states
[0].core_frequency
* 1000 != policy
->cpuinfo
.max_freq
)
817 printk(KERN_WARNING FW_WARN
"P-state 0 is not max freq\n");
819 switch (perf
->control_register
.space_id
) {
820 case ACPI_ADR_SPACE_SYSTEM_IO
:
822 * The core will not set policy->cur, because
823 * cpufreq_driver->get is NULL, so we need to set it here.
824 * However, we have to guess it, because the current speed is
825 * unknown and not detectable via IO ports.
827 policy
->cur
= acpi_cpufreq_guess_freq(data
, policy
->cpu
);
829 case ACPI_ADR_SPACE_FIXED_HARDWARE
:
830 acpi_cpufreq_driver
.get
= get_cur_freq_on_cpu
;
836 /* notify BIOS that we exist */
837 acpi_processor_notify_smm(THIS_MODULE
);
839 pr_debug("CPU%u - ACPI performance management activated.\n", cpu
);
840 for (i
= 0; i
< perf
->state_count
; i
++)
841 pr_debug(" %cP%d: %d MHz, %d mW, %d uS\n",
842 (i
== perf
->state
? '*' : ' '), i
,
843 (u32
) perf
->states
[i
].core_frequency
,
844 (u32
) perf
->states
[i
].power
,
845 (u32
) perf
->states
[i
].transition_latency
);
848 * the first call to ->target() should result in us actually
849 * writing something to the appropriate registers.
856 kfree(data
->freq_table
);
858 acpi_processor_unregister_performance(perf
, cpu
);
860 free_cpumask_var(data
->freqdomain_cpus
);
863 per_cpu(acfreq_data
, cpu
) = NULL
;
868 static int acpi_cpufreq_cpu_exit(struct cpufreq_policy
*policy
)
870 struct acpi_cpufreq_data
*data
= per_cpu(acfreq_data
, policy
->cpu
);
872 pr_debug("acpi_cpufreq_cpu_exit\n");
875 cpufreq_frequency_table_put_attr(policy
->cpu
);
876 per_cpu(acfreq_data
, policy
->cpu
) = NULL
;
877 acpi_processor_unregister_performance(data
->acpi_data
,
879 free_cpumask_var(data
->freqdomain_cpus
);
880 kfree(data
->freq_table
);
887 static int acpi_cpufreq_resume(struct cpufreq_policy
*policy
)
889 struct acpi_cpufreq_data
*data
= per_cpu(acfreq_data
, policy
->cpu
);
891 pr_debug("acpi_cpufreq_resume\n");
898 static struct freq_attr
*acpi_cpufreq_attr
[] = {
899 &cpufreq_freq_attr_scaling_available_freqs
,
901 NULL
, /* this is a placeholder for cpb, do not remove */
905 static struct cpufreq_driver acpi_cpufreq_driver
= {
906 .verify
= cpufreq_generic_frequency_table_verify
,
907 .target_index
= acpi_cpufreq_target
,
908 .bios_limit
= acpi_processor_get_bios_limit
,
909 .init
= acpi_cpufreq_cpu_init
,
910 .exit
= acpi_cpufreq_cpu_exit
,
911 .resume
= acpi_cpufreq_resume
,
912 .name
= "acpi-cpufreq",
913 .attr
= acpi_cpufreq_attr
,
916 static void __init
acpi_cpufreq_boost_init(void)
918 if (boot_cpu_has(X86_FEATURE_CPB
) || boot_cpu_has(X86_FEATURE_IDA
)) {
924 boost_supported
= true;
925 boost_enabled
= boost_state(0);
929 /* Force all MSRs to the same value */
930 boost_set_msrs(boost_enabled
, cpu_online_mask
);
932 register_cpu_notifier(&boost_nb
);
936 global_boost
.attr
.mode
= 0444;
938 /* We create the boost file in any case, though for systems without
939 * hardware support it will be read-only and hardwired to return 0.
941 if (cpufreq_sysfs_create_file(&(global_boost
.attr
)))
942 pr_warn(PFX
"could not register global boost sysfs file\n");
944 pr_debug("registered global boost sysfs file\n");
947 static void __exit
acpi_cpufreq_boost_exit(void)
949 cpufreq_sysfs_remove_file(&(global_boost
.attr
));
952 unregister_cpu_notifier(&boost_nb
);
959 static int __init
acpi_cpufreq_init(void)
966 /* don't keep reloading if cpufreq_driver exists */
967 if (cpufreq_get_current_driver())
970 pr_debug("acpi_cpufreq_init\n");
972 ret
= acpi_cpufreq_early_init();
976 #ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
977 /* this is a sysfs file with a strange name and an even stranger
978 * semantic - per CPU instantiation, but system global effect.
979 * Lets enable it only on AMD CPUs for compatibility reasons and
980 * only if configured. This is considered legacy code, which
981 * will probably be removed at some point in the future.
983 if (check_amd_hwpstate_cpu(0)) {
984 struct freq_attr
**iter
;
986 pr_debug("adding sysfs entry for cpb\n");
988 for (iter
= acpi_cpufreq_attr
; *iter
!= NULL
; iter
++)
991 /* make sure there is a terminator behind it */
997 ret
= cpufreq_register_driver(&acpi_cpufreq_driver
);
999 free_acpi_perf_data();
1001 acpi_cpufreq_boost_init();
1006 static void __exit
acpi_cpufreq_exit(void)
1008 pr_debug("acpi_cpufreq_exit\n");
1010 acpi_cpufreq_boost_exit();
1012 cpufreq_unregister_driver(&acpi_cpufreq_driver
);
1014 free_acpi_perf_data();
1017 module_param(acpi_pstate_strict
, uint
, 0644);
1018 MODULE_PARM_DESC(acpi_pstate_strict
,
1019 "value 0 or non-zero. non-zero -> strict ACPI checks are "
1020 "performed during frequency changes.");
1022 late_initcall(acpi_cpufreq_init
);
1023 module_exit(acpi_cpufreq_exit
);
1025 static const struct x86_cpu_id acpi_cpufreq_ids
[] = {
1026 X86_FEATURE_MATCH(X86_FEATURE_ACPI
),
1027 X86_FEATURE_MATCH(X86_FEATURE_HW_PSTATE
),
1030 MODULE_DEVICE_TABLE(x86cpu
, acpi_cpufreq_ids
);
1032 static const struct acpi_device_id processor_device_ids
[] = {
1033 {ACPI_PROCESSOR_OBJECT_HID
, },
1034 {ACPI_PROCESSOR_DEVICE_HID
, },
1037 MODULE_DEVICE_TABLE(acpi
, processor_device_ids
);
1039 MODULE_ALIAS("acpi");