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");