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,
427 unsigned int target_freq, unsigned int relation)
429 struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
430 struct acpi_processor_performance *perf;
431 struct cpufreq_freqs freqs;
433 unsigned int next_state = 0; /* Index into freq_table */
434 unsigned int next_perf_state = 0; /* Index into perf table */
437 pr_debug("acpi_cpufreq_target %d (%d)\n", target_freq, policy->cpu);
439 if (unlikely(data == NULL ||
440 data->acpi_data == NULL || data->freq_table == NULL)) {
444 perf = data->acpi_data;
445 result = cpufreq_frequency_table_target(policy,
448 relation, &next_state);
449 if (unlikely(result)) {
454 next_perf_state = data->freq_table[next_state].driver_data;
455 if (perf->state == next_perf_state) {
456 if (unlikely(data->resume)) {
457 pr_debug("Called after resume, resetting to P%d\n",
461 pr_debug("Already at target state (P%d)\n",
467 switch (data->cpu_feature) {
468 case SYSTEM_INTEL_MSR_CAPABLE:
469 cmd.type = SYSTEM_INTEL_MSR_CAPABLE;
470 cmd.addr.msr.reg = MSR_IA32_PERF_CTL;
471 cmd.val = (u32) perf->states[next_perf_state].control;
473 case SYSTEM_AMD_MSR_CAPABLE:
474 cmd.type = SYSTEM_AMD_MSR_CAPABLE;
475 cmd.addr.msr.reg = MSR_AMD_PERF_CTL;
476 cmd.val = (u32) perf->states[next_perf_state].control;
478 case SYSTEM_IO_CAPABLE:
479 cmd.type = SYSTEM_IO_CAPABLE;
480 cmd.addr.io.port = perf->control_register.address;
481 cmd.addr.io.bit_width = perf->control_register.bit_width;
482 cmd.val = (u32) perf->states[next_perf_state].control;
489 /* cpufreq holds the hotplug lock, so we are safe from here on */
490 if (policy->shared_type != CPUFREQ_SHARED_TYPE_ANY)
491 cmd.mask = policy->cpus;
493 cmd.mask = cpumask_of(policy->cpu);
495 freqs.old = perf->states[perf->state].core_frequency * 1000;
496 freqs.new = data->freq_table[next_state].frequency;
497 cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
501 if (acpi_pstate_strict) {
502 if (!check_freqs(cmd.mask, freqs.new, data)) {
503 pr_debug("acpi_cpufreq_target failed (%d)\n",
506 freqs.new = freqs.old;
510 cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
513 perf->state = next_perf_state;
520 acpi_cpufreq_guess_freq(struct acpi_cpufreq_data *data, unsigned int cpu)
522 struct acpi_processor_performance *perf = data->acpi_data;
525 /* search the closest match to cpu_khz */
528 unsigned long freqn = perf->states[0].core_frequency * 1000;
530 for (i = 0; i < (perf->state_count-1); i++) {
532 freqn = perf->states[i+1].core_frequency * 1000;
533 if ((2 * cpu_khz) > (freqn + freq)) {
538 perf->state = perf->state_count-1;
541 /* assume CPU is at P0... */
543 return perf->states[0].core_frequency * 1000;
547 static void free_acpi_perf_data(void)
551 /* Freeing a NULL pointer is OK, and alloc_percpu zeroes. */
552 for_each_possible_cpu(i)
553 free_cpumask_var(per_cpu_ptr(acpi_perf_data, i)
555 free_percpu(acpi_perf_data);
558 static int boost_notify(struct notifier_block *nb, unsigned long action,
561 unsigned cpu = (long)hcpu;
562 const struct cpumask *cpumask;
564 cpumask = get_cpu_mask(cpu);
567 * Clear the boost-disable bit on the CPU_DOWN path so that
568 * this cpu cannot block the remaining ones from boosting. On
569 * the CPU_UP path we simply keep the boost-disable flag in
570 * sync with the current global state.
575 case CPU_UP_PREPARE_FROZEN:
576 boost_set_msrs(boost_enabled, cpumask);
579 case CPU_DOWN_PREPARE:
580 case CPU_DOWN_PREPARE_FROZEN:
581 boost_set_msrs(1, cpumask);
592 static struct notifier_block boost_nb = {
593 .notifier_call = boost_notify,
597 * acpi_cpufreq_early_init - initialize ACPI P-States library
599 * Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c)
600 * in order to determine correct frequency and voltage pairings. We can
601 * do _PDC and _PSD and find out the processor dependency for the
602 * actual init that will happen later...
604 static int __init acpi_cpufreq_early_init(void)
607 pr_debug("acpi_cpufreq_early_init\n");
609 acpi_perf_data = alloc_percpu(struct acpi_processor_performance);
610 if (!acpi_perf_data) {
611 pr_debug("Memory allocation error for acpi_perf_data.\n");
614 for_each_possible_cpu(i) {
615 if (!zalloc_cpumask_var_node(
616 &per_cpu_ptr(acpi_perf_data, i)->shared_cpu_map,
617 GFP_KERNEL, cpu_to_node(i))) {
619 /* Freeing a NULL pointer is OK: alloc_percpu zeroes. */
620 free_acpi_perf_data();
625 /* Do initialization in ACPI core */
626 acpi_processor_preregister_performance(acpi_perf_data);
632 * Some BIOSes do SW_ANY coordination internally, either set it up in hw
633 * or do it in BIOS firmware and won't inform about it to OS. If not
634 * detected, this has a side effect of making CPU run at a different speed
635 * than OS intended it to run at. Detect it and handle it cleanly.
637 static int bios_with_sw_any_bug;
639 static int sw_any_bug_found(const struct dmi_system_id *d)
641 bios_with_sw_any_bug = 1;
645 static const struct dmi_system_id sw_any_bug_dmi_table[] = {
647 .callback = sw_any_bug_found,
648 .ident = "Supermicro Server X6DLP",
650 DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
651 DMI_MATCH(DMI_BIOS_VERSION, "080010"),
652 DMI_MATCH(DMI_PRODUCT_NAME, "X6DLP"),
658 static int acpi_cpufreq_blacklist(struct cpuinfo_x86 *c)
660 /* Intel Xeon Processor 7100 Series Specification Update
661 * http://www.intel.com/Assets/PDF/specupdate/314554.pdf
662 * AL30: A Machine Check Exception (MCE) Occurring during an
663 * Enhanced Intel SpeedStep Technology Ratio Change May Cause
664 * Both Processor Cores to Lock Up. */
665 if (c->x86_vendor == X86_VENDOR_INTEL) {
666 if ((c->x86 == 15) &&
667 (c->x86_model == 6) &&
668 (c->x86_mask == 8)) {
669 printk(KERN_INFO "acpi-cpufreq: Intel(R) "
670 "Xeon(R) 7100 Errata AL30, processors may "
671 "lock up on frequency changes: disabling "
680 static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
683 unsigned int valid_states = 0;
684 unsigned int cpu = policy->cpu;
685 struct acpi_cpufreq_data *data;
686 unsigned int result = 0;
687 struct cpuinfo_x86 *c = &cpu_data(policy->cpu);
688 struct acpi_processor_performance *perf;
690 static int blacklisted;
693 pr_debug("acpi_cpufreq_cpu_init\n");
698 blacklisted = acpi_cpufreq_blacklist(c);
703 data = kzalloc(sizeof(*data), GFP_KERNEL);
707 if (!zalloc_cpumask_var(&data->freqdomain_cpus, GFP_KERNEL)) {
712 data->acpi_data = per_cpu_ptr(acpi_perf_data, cpu);
713 per_cpu(acfreq_data, cpu) = data;
715 if (cpu_has(c, X86_FEATURE_CONSTANT_TSC))
716 acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS;
718 result = acpi_processor_register_performance(data->acpi_data, cpu);
722 perf = data->acpi_data;
723 policy->shared_type = perf->shared_type;
726 * Will let policy->cpus know about dependency only when software
727 * coordination is required.
729 if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL ||
730 policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) {
731 cpumask_copy(policy->cpus, perf->shared_cpu_map);
733 cpumask_copy(data->freqdomain_cpus, perf->shared_cpu_map);
736 dmi_check_system(sw_any_bug_dmi_table);
737 if (bios_with_sw_any_bug && !policy_is_shared(policy)) {
738 policy->shared_type = CPUFREQ_SHARED_TYPE_ALL;
739 cpumask_copy(policy->cpus, cpu_core_mask(cpu));
742 if (check_amd_hwpstate_cpu(cpu) && !acpi_pstate_strict) {
743 cpumask_clear(policy->cpus);
744 cpumask_set_cpu(cpu, policy->cpus);
745 cpumask_copy(data->freqdomain_cpus, cpu_sibling_mask(cpu));
746 policy->shared_type = CPUFREQ_SHARED_TYPE_HW;
747 pr_info_once(PFX "overriding BIOS provided _PSD data\n");
751 /* capability check */
752 if (perf->state_count <= 1) {
753 pr_debug("No P-States\n");
758 if (perf->control_register.space_id != perf->status_register.space_id) {
763 switch (perf->control_register.space_id) {
764 case ACPI_ADR_SPACE_SYSTEM_IO:
765 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
766 boot_cpu_data.x86 == 0xf) {
767 pr_debug("AMD K8 systems must use native drivers.\n");
771 pr_debug("SYSTEM IO addr space\n");
772 data->cpu_feature = SYSTEM_IO_CAPABLE;
774 case ACPI_ADR_SPACE_FIXED_HARDWARE:
775 pr_debug("HARDWARE addr space\n");
776 if (check_est_cpu(cpu)) {
777 data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE;
780 if (check_amd_hwpstate_cpu(cpu)) {
781 data->cpu_feature = SYSTEM_AMD_MSR_CAPABLE;
787 pr_debug("Unknown addr space %d\n",
788 (u32) (perf->control_register.space_id));
793 data->freq_table = kmalloc(sizeof(*data->freq_table) *
794 (perf->state_count+1), GFP_KERNEL);
795 if (!data->freq_table) {
800 /* detect transition latency */
801 policy->cpuinfo.transition_latency = 0;
802 for (i = 0; i < perf->state_count; i++) {
803 if ((perf->states[i].transition_latency * 1000) >
804 policy->cpuinfo.transition_latency)
805 policy->cpuinfo.transition_latency =
806 perf->states[i].transition_latency * 1000;
809 /* Check for high latency (>20uS) from buggy BIOSes, like on T42 */
810 if (perf->control_register.space_id == ACPI_ADR_SPACE_FIXED_HARDWARE &&
811 policy->cpuinfo.transition_latency > 20 * 1000) {
812 policy->cpuinfo.transition_latency = 20 * 1000;
813 printk_once(KERN_INFO
814 "P-state transition latency capped at 20 uS\n");
818 for (i = 0; i < perf->state_count; i++) {
819 if (i > 0 && perf->states[i].core_frequency >=
820 data->freq_table[valid_states-1].frequency / 1000)
823 data->freq_table[valid_states].driver_data = i;
824 data->freq_table[valid_states].frequency =
825 perf->states[i].core_frequency * 1000;
828 data->freq_table[valid_states].frequency = CPUFREQ_TABLE_END;
831 result = cpufreq_table_validate_and_show(policy, data->freq_table);
835 if (perf->states[0].core_frequency * 1000 != policy->cpuinfo.max_freq)
836 printk(KERN_WARNING FW_WARN "P-state 0 is not max freq\n");
838 switch (perf->control_register.space_id) {
839 case ACPI_ADR_SPACE_SYSTEM_IO:
841 * The core will not set policy->cur, because
842 * cpufreq_driver->get is NULL, so we need to set it here.
843 * However, we have to guess it, because the current speed is
844 * unknown and not detectable via IO ports.
846 policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu);
848 case ACPI_ADR_SPACE_FIXED_HARDWARE:
849 acpi_cpufreq_driver.get = get_cur_freq_on_cpu;
855 /* notify BIOS that we exist */
856 acpi_processor_notify_smm(THIS_MODULE);
858 pr_debug("CPU%u - ACPI performance management activated.\n", cpu);
859 for (i = 0; i < perf->state_count; i++)
860 pr_debug(" %cP%d: %d MHz, %d mW, %d uS\n",
861 (i == perf->state ? '*' : ' '), i,
862 (u32) perf->states[i].core_frequency,
863 (u32) perf->states[i].power,
864 (u32) perf->states[i].transition_latency);
867 * the first call to ->target() should result in us actually
868 * writing something to the appropriate registers.
875 kfree(data->freq_table);
877 acpi_processor_unregister_performance(perf, cpu);
879 free_cpumask_var(data->freqdomain_cpus);
882 per_cpu(acfreq_data, cpu) = NULL;
887 static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy)
889 struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
891 pr_debug("acpi_cpufreq_cpu_exit\n");
894 cpufreq_frequency_table_put_attr(policy->cpu);
895 per_cpu(acfreq_data, policy->cpu) = NULL;
896 acpi_processor_unregister_performance(data->acpi_data,
898 free_cpumask_var(data->freqdomain_cpus);
899 kfree(data->freq_table);
906 static int acpi_cpufreq_resume(struct cpufreq_policy *policy)
908 struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
910 pr_debug("acpi_cpufreq_resume\n");
917 static struct freq_attr *acpi_cpufreq_attr[] = {
918 &cpufreq_freq_attr_scaling_available_freqs,
920 NULL, /* this is a placeholder for cpb, do not remove */
924 static struct cpufreq_driver acpi_cpufreq_driver = {
925 .verify = cpufreq_generic_frequency_table_verify,
926 .target = acpi_cpufreq_target,
927 .bios_limit = acpi_processor_get_bios_limit,
928 .init = acpi_cpufreq_cpu_init,
929 .exit = acpi_cpufreq_cpu_exit,
930 .resume = acpi_cpufreq_resume,
931 .name = "acpi-cpufreq",
932 .attr = acpi_cpufreq_attr,
935 static void __init acpi_cpufreq_boost_init(void)
937 if (boot_cpu_has(X86_FEATURE_CPB) || boot_cpu_has(X86_FEATURE_IDA)) {
943 boost_supported = true;
944 boost_enabled = boost_state(0);
948 /* Force all MSRs to the same value */
949 boost_set_msrs(boost_enabled, cpu_online_mask);
951 register_cpu_notifier(&boost_nb);
955 global_boost.attr.mode = 0444;
957 /* We create the boost file in any case, though for systems without
958 * hardware support it will be read-only and hardwired to return 0.
960 if (cpufreq_sysfs_create_file(&(global_boost.attr)))
961 pr_warn(PFX "could not register global boost sysfs file\n");
963 pr_debug("registered global boost sysfs file\n");
966 static void __exit acpi_cpufreq_boost_exit(void)
968 cpufreq_sysfs_remove_file(&(global_boost.attr));
971 unregister_cpu_notifier(&boost_nb);
978 static int __init acpi_cpufreq_init(void)
982 /* don't keep reloading if cpufreq_driver exists */
983 if (cpufreq_get_current_driver())
989 pr_debug("acpi_cpufreq_init\n");
991 ret = acpi_cpufreq_early_init();
995 #ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
996 /* this is a sysfs file with a strange name and an even stranger
997 * semantic - per CPU instantiation, but system global effect.
998 * Lets enable it only on AMD CPUs for compatibility reasons and
999 * only if configured. This is considered legacy code, which
1000 * will probably be removed at some point in the future.
1002 if (check_amd_hwpstate_cpu(0)) {
1003 struct freq_attr **iter;
1005 pr_debug("adding sysfs entry for cpb\n");
1007 for (iter = acpi_cpufreq_attr; *iter != NULL; iter++)
1010 /* make sure there is a terminator behind it */
1011 if (iter[1] == NULL)
1016 ret = cpufreq_register_driver(&acpi_cpufreq_driver);
1018 free_acpi_perf_data();
1020 acpi_cpufreq_boost_init();
1025 static void __exit acpi_cpufreq_exit(void)
1027 pr_debug("acpi_cpufreq_exit\n");
1029 acpi_cpufreq_boost_exit();
1031 cpufreq_unregister_driver(&acpi_cpufreq_driver);
1033 free_acpi_perf_data();
1036 module_param(acpi_pstate_strict, uint, 0644);
1037 MODULE_PARM_DESC(acpi_pstate_strict,
1038 "value 0 or non-zero. non-zero -> strict ACPI checks are "
1039 "performed during frequency changes.");
1041 late_initcall(acpi_cpufreq_init);
1042 module_exit(acpi_cpufreq_exit);
1044 static const struct x86_cpu_id acpi_cpufreq_ids[] = {
1045 X86_FEATURE_MATCH(X86_FEATURE_ACPI),
1046 X86_FEATURE_MATCH(X86_FEATURE_HW_PSTATE),
1049 MODULE_DEVICE_TABLE(x86cpu, acpi_cpufreq_ids);
1051 static const struct acpi_device_id processor_device_ids[] = {
1052 {ACPI_PROCESSOR_OBJECT_HID, },
1053 {ACPI_PROCESSOR_DEVICE_HID, },
1056 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
1058 MODULE_ALIAS("acpi");