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cpufreq: Add module aliases for acpi-cpufreq
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1 /*
2  * acpi-cpufreq.c - ACPI Processor P-States Driver
3  *
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>
8  *
9  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10  *
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.
15  *
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.
20  *
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.
24  *
25  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
26  */
27
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>
37
38 #include <linux/acpi.h>
39 #include <linux/io.h>
40 #include <linux/delay.h>
41 #include <linux/uaccess.h>
42
43 #include <acpi/processor.h>
44
45 #include <asm/msr.h>
46 #include <asm/processor.h>
47 #include <asm/cpufeature.h>
48 #include "mperf.h"
49
50 MODULE_AUTHOR("Paul Diefenbaugh, Dominik Brodowski");
51 MODULE_DESCRIPTION("ACPI Processor P-States Driver");
52 MODULE_LICENSE("GPL");
53
54 #define PFX "acpi-cpufreq: "
55
56 enum {
57         UNDEFINED_CAPABLE = 0,
58         SYSTEM_INTEL_MSR_CAPABLE,
59         SYSTEM_AMD_MSR_CAPABLE,
60         SYSTEM_IO_CAPABLE,
61 };
62
63 #define INTEL_MSR_RANGE         (0xffff)
64 #define AMD_MSR_RANGE           (0x7)
65
66 #define MSR_K7_HWCR_CPB_DIS     (1ULL << 25)
67
68 struct acpi_cpufreq_data {
69         struct acpi_processor_performance *acpi_data;
70         struct cpufreq_frequency_table *freq_table;
71         unsigned int resume;
72         unsigned int cpu_feature;
73 };
74
75 static DEFINE_PER_CPU(struct acpi_cpufreq_data *, acfreq_data);
76
77 /* acpi_perf_data is a pointer to percpu data. */
78 static struct acpi_processor_performance __percpu *acpi_perf_data;
79
80 static struct cpufreq_driver acpi_cpufreq_driver;
81
82 static unsigned int acpi_pstate_strict;
83 static bool boost_enabled, boost_supported;
84 static struct msr __percpu *msrs;
85
86 static bool boost_state(unsigned int cpu)
87 {
88         u32 lo, hi;
89         u64 msr;
90
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);
96         case X86_VENDOR_AMD:
97                 rdmsr_on_cpu(cpu, MSR_K7_HWCR, &lo, &hi);
98                 msr = lo | ((u64)hi << 32);
99                 return !(msr & MSR_K7_HWCR_CPB_DIS);
100         }
101         return false;
102 }
103
104 static void boost_set_msrs(bool enable, const struct cpumask *cpumask)
105 {
106         u32 cpu;
107         u32 msr_addr;
108         u64 msr_mask;
109
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;
114                 break;
115         case X86_VENDOR_AMD:
116                 msr_addr = MSR_K7_HWCR;
117                 msr_mask = MSR_K7_HWCR_CPB_DIS;
118                 break;
119         default:
120                 return;
121         }
122
123         rdmsr_on_cpus(cpumask, msr_addr, msrs);
124
125         for_each_cpu(cpu, cpumask) {
126                 struct msr *reg = per_cpu_ptr(msrs, cpu);
127                 if (enable)
128                         reg->q &= ~msr_mask;
129                 else
130                         reg->q |= msr_mask;
131         }
132
133         wrmsr_on_cpus(cpumask, msr_addr, msrs);
134 }
135
136 static ssize_t _store_boost(const char *buf, size_t count)
137 {
138         int ret;
139         unsigned long val = 0;
140
141         if (!boost_supported)
142                 return -EINVAL;
143
144         ret = kstrtoul(buf, 10, &val);
145         if (ret || (val > 1))
146                 return -EINVAL;
147
148         if ((val && boost_enabled) || (!val && !boost_enabled))
149                 return count;
150
151         get_online_cpus();
152
153         boost_set_msrs(val, cpu_online_mask);
154
155         put_online_cpus();
156
157         boost_enabled = val;
158         pr_debug("Core Boosting %sabled.\n", val ? "en" : "dis");
159
160         return count;
161 }
162
163 static ssize_t store_global_boost(struct kobject *kobj, struct attribute *attr,
164                                   const char *buf, size_t count)
165 {
166         return _store_boost(buf, count);
167 }
168
169 static ssize_t show_global_boost(struct kobject *kobj,
170                                  struct attribute *attr, char *buf)
171 {
172         return sprintf(buf, "%u\n", boost_enabled);
173 }
174
175 static struct global_attr global_boost = __ATTR(boost, 0644,
176                                                 show_global_boost,
177                                                 store_global_boost);
178
179 #ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
180 static ssize_t store_cpb(struct cpufreq_policy *policy, const char *buf,
181                          size_t count)
182 {
183         return _store_boost(buf, count);
184 }
185
186 static ssize_t show_cpb(struct cpufreq_policy *policy, char *buf)
187 {
188         return sprintf(buf, "%u\n", boost_enabled);
189 }
190
191 static struct freq_attr cpb = __ATTR(cpb, 0644, show_cpb, store_cpb);
192 #endif
193
194 static int check_est_cpu(unsigned int cpuid)
195 {
196         struct cpuinfo_x86 *cpu = &cpu_data(cpuid);
197
198         return cpu_has(cpu, X86_FEATURE_EST);
199 }
200
201 static int check_amd_hwpstate_cpu(unsigned int cpuid)
202 {
203         struct cpuinfo_x86 *cpu = &cpu_data(cpuid);
204
205         return cpu_has(cpu, X86_FEATURE_HW_PSTATE);
206 }
207
208 static unsigned extract_io(u32 value, struct acpi_cpufreq_data *data)
209 {
210         struct acpi_processor_performance *perf;
211         int i;
212
213         perf = data->acpi_data;
214
215         for (i = 0; i < perf->state_count; i++) {
216                 if (value == perf->states[i].status)
217                         return data->freq_table[i].frequency;
218         }
219         return 0;
220 }
221
222 static unsigned extract_msr(u32 msr, struct acpi_cpufreq_data *data)
223 {
224         int i;
225         struct acpi_processor_performance *perf;
226
227         if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
228                 msr &= AMD_MSR_RANGE;
229         else
230                 msr &= INTEL_MSR_RANGE;
231
232         perf = data->acpi_data;
233
234         for (i = 0; data->freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
235                 if (msr == perf->states[data->freq_table[i].index].status)
236                         return data->freq_table[i].frequency;
237         }
238         return data->freq_table[0].frequency;
239 }
240
241 static unsigned extract_freq(u32 val, struct acpi_cpufreq_data *data)
242 {
243         switch (data->cpu_feature) {
244         case SYSTEM_INTEL_MSR_CAPABLE:
245         case SYSTEM_AMD_MSR_CAPABLE:
246                 return extract_msr(val, data);
247         case SYSTEM_IO_CAPABLE:
248                 return extract_io(val, data);
249         default:
250                 return 0;
251         }
252 }
253
254 struct msr_addr {
255         u32 reg;
256 };
257
258 struct io_addr {
259         u16 port;
260         u8 bit_width;
261 };
262
263 struct drv_cmd {
264         unsigned int type;
265         const struct cpumask *mask;
266         union {
267                 struct msr_addr msr;
268                 struct io_addr io;
269         } addr;
270         u32 val;
271 };
272
273 /* Called via smp_call_function_single(), on the target CPU */
274 static void do_drv_read(void *_cmd)
275 {
276         struct drv_cmd *cmd = _cmd;
277         u32 h;
278
279         switch (cmd->type) {
280         case SYSTEM_INTEL_MSR_CAPABLE:
281         case SYSTEM_AMD_MSR_CAPABLE:
282                 rdmsr(cmd->addr.msr.reg, cmd->val, h);
283                 break;
284         case SYSTEM_IO_CAPABLE:
285                 acpi_os_read_port((acpi_io_address)cmd->addr.io.port,
286                                 &cmd->val,
287                                 (u32)cmd->addr.io.bit_width);
288                 break;
289         default:
290                 break;
291         }
292 }
293
294 /* Called via smp_call_function_many(), on the target CPUs */
295 static void do_drv_write(void *_cmd)
296 {
297         struct drv_cmd *cmd = _cmd;
298         u32 lo, hi;
299
300         switch (cmd->type) {
301         case SYSTEM_INTEL_MSR_CAPABLE:
302                 rdmsr(cmd->addr.msr.reg, lo, hi);
303                 lo = (lo & ~INTEL_MSR_RANGE) | (cmd->val & INTEL_MSR_RANGE);
304                 wrmsr(cmd->addr.msr.reg, lo, hi);
305                 break;
306         case SYSTEM_AMD_MSR_CAPABLE:
307                 wrmsr(cmd->addr.msr.reg, cmd->val, 0);
308                 break;
309         case SYSTEM_IO_CAPABLE:
310                 acpi_os_write_port((acpi_io_address)cmd->addr.io.port,
311                                 cmd->val,
312                                 (u32)cmd->addr.io.bit_width);
313                 break;
314         default:
315                 break;
316         }
317 }
318
319 static void drv_read(struct drv_cmd *cmd)
320 {
321         int err;
322         cmd->val = 0;
323
324         err = smp_call_function_any(cmd->mask, do_drv_read, cmd, 1);
325         WARN_ON_ONCE(err);      /* smp_call_function_any() was buggy? */
326 }
327
328 static void drv_write(struct drv_cmd *cmd)
329 {
330         int this_cpu;
331
332         this_cpu = get_cpu();
333         if (cpumask_test_cpu(this_cpu, cmd->mask))
334                 do_drv_write(cmd);
335         smp_call_function_many(cmd->mask, do_drv_write, cmd, 1);
336         put_cpu();
337 }
338
339 static u32 get_cur_val(const struct cpumask *mask)
340 {
341         struct acpi_processor_performance *perf;
342         struct drv_cmd cmd;
343
344         if (unlikely(cpumask_empty(mask)))
345                 return 0;
346
347         switch (per_cpu(acfreq_data, cpumask_first(mask))->cpu_feature) {
348         case SYSTEM_INTEL_MSR_CAPABLE:
349                 cmd.type = SYSTEM_INTEL_MSR_CAPABLE;
350                 cmd.addr.msr.reg = MSR_IA32_PERF_STATUS;
351                 break;
352         case SYSTEM_AMD_MSR_CAPABLE:
353                 cmd.type = SYSTEM_AMD_MSR_CAPABLE;
354                 cmd.addr.msr.reg = MSR_AMD_PERF_STATUS;
355                 break;
356         case SYSTEM_IO_CAPABLE:
357                 cmd.type = SYSTEM_IO_CAPABLE;
358                 perf = per_cpu(acfreq_data, cpumask_first(mask))->acpi_data;
359                 cmd.addr.io.port = perf->control_register.address;
360                 cmd.addr.io.bit_width = perf->control_register.bit_width;
361                 break;
362         default:
363                 return 0;
364         }
365
366         cmd.mask = mask;
367         drv_read(&cmd);
368
369         pr_debug("get_cur_val = %u\n", cmd.val);
370
371         return cmd.val;
372 }
373
374 static unsigned int get_cur_freq_on_cpu(unsigned int cpu)
375 {
376         struct acpi_cpufreq_data *data = per_cpu(acfreq_data, cpu);
377         unsigned int freq;
378         unsigned int cached_freq;
379
380         pr_debug("get_cur_freq_on_cpu (%d)\n", cpu);
381
382         if (unlikely(data == NULL ||
383                      data->acpi_data == NULL || data->freq_table == NULL)) {
384                 return 0;
385         }
386
387         cached_freq = data->freq_table[data->acpi_data->state].frequency;
388         freq = extract_freq(get_cur_val(cpumask_of(cpu)), data);
389         if (freq != cached_freq) {
390                 /*
391                  * The dreaded BIOS frequency change behind our back.
392                  * Force set the frequency on next target call.
393                  */
394                 data->resume = 1;
395         }
396
397         pr_debug("cur freq = %u\n", freq);
398
399         return freq;
400 }
401
402 static unsigned int check_freqs(const struct cpumask *mask, unsigned int freq,
403                                 struct acpi_cpufreq_data *data)
404 {
405         unsigned int cur_freq;
406         unsigned int i;
407
408         for (i = 0; i < 100; i++) {
409                 cur_freq = extract_freq(get_cur_val(mask), data);
410                 if (cur_freq == freq)
411                         return 1;
412                 udelay(10);
413         }
414         return 0;
415 }
416
417 static int acpi_cpufreq_target(struct cpufreq_policy *policy,
418                                unsigned int target_freq, unsigned int relation)
419 {
420         struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
421         struct acpi_processor_performance *perf;
422         struct cpufreq_freqs freqs;
423         struct drv_cmd cmd;
424         unsigned int next_state = 0; /* Index into freq_table */
425         unsigned int next_perf_state = 0; /* Index into perf table */
426         unsigned int i;
427         int result = 0;
428
429         pr_debug("acpi_cpufreq_target %d (%d)\n", target_freq, policy->cpu);
430
431         if (unlikely(data == NULL ||
432              data->acpi_data == NULL || data->freq_table == NULL)) {
433                 return -ENODEV;
434         }
435
436         perf = data->acpi_data;
437         result = cpufreq_frequency_table_target(policy,
438                                                 data->freq_table,
439                                                 target_freq,
440                                                 relation, &next_state);
441         if (unlikely(result)) {
442                 result = -ENODEV;
443                 goto out;
444         }
445
446         next_perf_state = data->freq_table[next_state].index;
447         if (perf->state == next_perf_state) {
448                 if (unlikely(data->resume)) {
449                         pr_debug("Called after resume, resetting to P%d\n",
450                                 next_perf_state);
451                         data->resume = 0;
452                 } else {
453                         pr_debug("Already at target state (P%d)\n",
454                                 next_perf_state);
455                         goto out;
456                 }
457         }
458
459         switch (data->cpu_feature) {
460         case SYSTEM_INTEL_MSR_CAPABLE:
461                 cmd.type = SYSTEM_INTEL_MSR_CAPABLE;
462                 cmd.addr.msr.reg = MSR_IA32_PERF_CTL;
463                 cmd.val = (u32) perf->states[next_perf_state].control;
464                 break;
465         case SYSTEM_AMD_MSR_CAPABLE:
466                 cmd.type = SYSTEM_AMD_MSR_CAPABLE;
467                 cmd.addr.msr.reg = MSR_AMD_PERF_CTL;
468                 cmd.val = (u32) perf->states[next_perf_state].control;
469                 break;
470         case SYSTEM_IO_CAPABLE:
471                 cmd.type = SYSTEM_IO_CAPABLE;
472                 cmd.addr.io.port = perf->control_register.address;
473                 cmd.addr.io.bit_width = perf->control_register.bit_width;
474                 cmd.val = (u32) perf->states[next_perf_state].control;
475                 break;
476         default:
477                 result = -ENODEV;
478                 goto out;
479         }
480
481         /* cpufreq holds the hotplug lock, so we are safe from here on */
482         if (policy->shared_type != CPUFREQ_SHARED_TYPE_ANY)
483                 cmd.mask = policy->cpus;
484         else
485                 cmd.mask = cpumask_of(policy->cpu);
486
487         freqs.old = perf->states[perf->state].core_frequency * 1000;
488         freqs.new = data->freq_table[next_state].frequency;
489         for_each_cpu(i, policy->cpus) {
490                 freqs.cpu = i;
491                 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
492         }
493
494         drv_write(&cmd);
495
496         if (acpi_pstate_strict) {
497                 if (!check_freqs(cmd.mask, freqs.new, data)) {
498                         pr_debug("acpi_cpufreq_target failed (%d)\n",
499                                 policy->cpu);
500                         result = -EAGAIN;
501                         goto out;
502                 }
503         }
504
505         for_each_cpu(i, policy->cpus) {
506                 freqs.cpu = i;
507                 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
508         }
509         perf->state = next_perf_state;
510
511 out:
512         return result;
513 }
514
515 static int acpi_cpufreq_verify(struct cpufreq_policy *policy)
516 {
517         struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
518
519         pr_debug("acpi_cpufreq_verify\n");
520
521         return cpufreq_frequency_table_verify(policy, data->freq_table);
522 }
523
524 static unsigned long
525 acpi_cpufreq_guess_freq(struct acpi_cpufreq_data *data, unsigned int cpu)
526 {
527         struct acpi_processor_performance *perf = data->acpi_data;
528
529         if (cpu_khz) {
530                 /* search the closest match to cpu_khz */
531                 unsigned int i;
532                 unsigned long freq;
533                 unsigned long freqn = perf->states[0].core_frequency * 1000;
534
535                 for (i = 0; i < (perf->state_count-1); i++) {
536                         freq = freqn;
537                         freqn = perf->states[i+1].core_frequency * 1000;
538                         if ((2 * cpu_khz) > (freqn + freq)) {
539                                 perf->state = i;
540                                 return freq;
541                         }
542                 }
543                 perf->state = perf->state_count-1;
544                 return freqn;
545         } else {
546                 /* assume CPU is at P0... */
547                 perf->state = 0;
548                 return perf->states[0].core_frequency * 1000;
549         }
550 }
551
552 static void free_acpi_perf_data(void)
553 {
554         unsigned int i;
555
556         /* Freeing a NULL pointer is OK, and alloc_percpu zeroes. */
557         for_each_possible_cpu(i)
558                 free_cpumask_var(per_cpu_ptr(acpi_perf_data, i)
559                                  ->shared_cpu_map);
560         free_percpu(acpi_perf_data);
561 }
562
563 static int boost_notify(struct notifier_block *nb, unsigned long action,
564                       void *hcpu)
565 {
566         unsigned cpu = (long)hcpu;
567         const struct cpumask *cpumask;
568
569         cpumask = get_cpu_mask(cpu);
570
571         /*
572          * Clear the boost-disable bit on the CPU_DOWN path so that
573          * this cpu cannot block the remaining ones from boosting. On
574          * the CPU_UP path we simply keep the boost-disable flag in
575          * sync with the current global state.
576          */
577
578         switch (action) {
579         case CPU_UP_PREPARE:
580         case CPU_UP_PREPARE_FROZEN:
581                 boost_set_msrs(boost_enabled, cpumask);
582                 break;
583
584         case CPU_DOWN_PREPARE:
585         case CPU_DOWN_PREPARE_FROZEN:
586                 boost_set_msrs(1, cpumask);
587                 break;
588
589         default:
590                 break;
591         }
592
593         return NOTIFY_OK;
594 }
595
596
597 static struct notifier_block boost_nb = {
598         .notifier_call          = boost_notify,
599 };
600
601 /*
602  * acpi_cpufreq_early_init - initialize ACPI P-States library
603  *
604  * Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c)
605  * in order to determine correct frequency and voltage pairings. We can
606  * do _PDC and _PSD and find out the processor dependency for the
607  * actual init that will happen later...
608  */
609 static int __init acpi_cpufreq_early_init(void)
610 {
611         unsigned int i;
612         pr_debug("acpi_cpufreq_early_init\n");
613
614         acpi_perf_data = alloc_percpu(struct acpi_processor_performance);
615         if (!acpi_perf_data) {
616                 pr_debug("Memory allocation error for acpi_perf_data.\n");
617                 return -ENOMEM;
618         }
619         for_each_possible_cpu(i) {
620                 if (!zalloc_cpumask_var_node(
621                         &per_cpu_ptr(acpi_perf_data, i)->shared_cpu_map,
622                         GFP_KERNEL, cpu_to_node(i))) {
623
624                         /* Freeing a NULL pointer is OK: alloc_percpu zeroes. */
625                         free_acpi_perf_data();
626                         return -ENOMEM;
627                 }
628         }
629
630         /* Do initialization in ACPI core */
631         acpi_processor_preregister_performance(acpi_perf_data);
632         return 0;
633 }
634
635 #ifdef CONFIG_SMP
636 /*
637  * Some BIOSes do SW_ANY coordination internally, either set it up in hw
638  * or do it in BIOS firmware and won't inform about it to OS. If not
639  * detected, this has a side effect of making CPU run at a different speed
640  * than OS intended it to run at. Detect it and handle it cleanly.
641  */
642 static int bios_with_sw_any_bug;
643
644 static int sw_any_bug_found(const struct dmi_system_id *d)
645 {
646         bios_with_sw_any_bug = 1;
647         return 0;
648 }
649
650 static const struct dmi_system_id sw_any_bug_dmi_table[] = {
651         {
652                 .callback = sw_any_bug_found,
653                 .ident = "Supermicro Server X6DLP",
654                 .matches = {
655                         DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
656                         DMI_MATCH(DMI_BIOS_VERSION, "080010"),
657                         DMI_MATCH(DMI_PRODUCT_NAME, "X6DLP"),
658                 },
659         },
660         { }
661 };
662
663 static int acpi_cpufreq_blacklist(struct cpuinfo_x86 *c)
664 {
665         /* Intel Xeon Processor 7100 Series Specification Update
666          * http://www.intel.com/Assets/PDF/specupdate/314554.pdf
667          * AL30: A Machine Check Exception (MCE) Occurring during an
668          * Enhanced Intel SpeedStep Technology Ratio Change May Cause
669          * Both Processor Cores to Lock Up. */
670         if (c->x86_vendor == X86_VENDOR_INTEL) {
671                 if ((c->x86 == 15) &&
672                     (c->x86_model == 6) &&
673                     (c->x86_mask == 8)) {
674                         printk(KERN_INFO "acpi-cpufreq: Intel(R) "
675                             "Xeon(R) 7100 Errata AL30, processors may "
676                             "lock up on frequency changes: disabling "
677                             "acpi-cpufreq.\n");
678                         return -ENODEV;
679                     }
680                 }
681         return 0;
682 }
683 #endif
684
685 static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
686 {
687         unsigned int i;
688         unsigned int valid_states = 0;
689         unsigned int cpu = policy->cpu;
690         struct acpi_cpufreq_data *data;
691         unsigned int result = 0;
692         struct cpuinfo_x86 *c = &cpu_data(policy->cpu);
693         struct acpi_processor_performance *perf;
694 #ifdef CONFIG_SMP
695         static int blacklisted;
696 #endif
697
698         pr_debug("acpi_cpufreq_cpu_init\n");
699
700 #ifdef CONFIG_SMP
701         if (blacklisted)
702                 return blacklisted;
703         blacklisted = acpi_cpufreq_blacklist(c);
704         if (blacklisted)
705                 return blacklisted;
706 #endif
707
708         data = kzalloc(sizeof(struct acpi_cpufreq_data), GFP_KERNEL);
709         if (!data)
710                 return -ENOMEM;
711
712         data->acpi_data = per_cpu_ptr(acpi_perf_data, cpu);
713         per_cpu(acfreq_data, cpu) = data;
714
715         if (cpu_has(c, X86_FEATURE_CONSTANT_TSC))
716                 acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS;
717
718         result = acpi_processor_register_performance(data->acpi_data, cpu);
719         if (result)
720                 goto err_free;
721
722         perf = data->acpi_data;
723         policy->shared_type = perf->shared_type;
724
725         /*
726          * Will let policy->cpus know about dependency only when software
727          * coordination is required.
728          */
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);
732         }
733         cpumask_copy(policy->related_cpus, perf->shared_cpu_map);
734
735 #ifdef CONFIG_SMP
736         dmi_check_system(sw_any_bug_dmi_table);
737         if (bios_with_sw_any_bug && cpumask_weight(policy->cpus) == 1) {
738                 policy->shared_type = CPUFREQ_SHARED_TYPE_ALL;
739                 cpumask_copy(policy->cpus, cpu_core_mask(cpu));
740         }
741
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(policy->related_cpus, cpu_sibling_mask(cpu));
746                 policy->shared_type = CPUFREQ_SHARED_TYPE_HW;
747                 pr_info_once(PFX "overriding BIOS provided _PSD data\n");
748         }
749 #endif
750
751         /* capability check */
752         if (perf->state_count <= 1) {
753                 pr_debug("No P-States\n");
754                 result = -ENODEV;
755                 goto err_unreg;
756         }
757
758         if (perf->control_register.space_id != perf->status_register.space_id) {
759                 result = -ENODEV;
760                 goto err_unreg;
761         }
762
763         switch (perf->control_register.space_id) {
764         case ACPI_ADR_SPACE_SYSTEM_IO:
765                 pr_debug("SYSTEM IO addr space\n");
766                 data->cpu_feature = SYSTEM_IO_CAPABLE;
767                 break;
768         case ACPI_ADR_SPACE_FIXED_HARDWARE:
769                 pr_debug("HARDWARE addr space\n");
770                 if (check_est_cpu(cpu)) {
771                         data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE;
772                         break;
773                 }
774                 if (check_amd_hwpstate_cpu(cpu)) {
775                         data->cpu_feature = SYSTEM_AMD_MSR_CAPABLE;
776                         break;
777                 }
778                 result = -ENODEV;
779                 goto err_unreg;
780         default:
781                 pr_debug("Unknown addr space %d\n",
782                         (u32) (perf->control_register.space_id));
783                 result = -ENODEV;
784                 goto err_unreg;
785         }
786
787         data->freq_table = kmalloc(sizeof(struct cpufreq_frequency_table) *
788                     (perf->state_count+1), GFP_KERNEL);
789         if (!data->freq_table) {
790                 result = -ENOMEM;
791                 goto err_unreg;
792         }
793
794         /* detect transition latency */
795         policy->cpuinfo.transition_latency = 0;
796         for (i = 0; i < perf->state_count; i++) {
797                 if ((perf->states[i].transition_latency * 1000) >
798                     policy->cpuinfo.transition_latency)
799                         policy->cpuinfo.transition_latency =
800                             perf->states[i].transition_latency * 1000;
801         }
802
803         /* Check for high latency (>20uS) from buggy BIOSes, like on T42 */
804         if (perf->control_register.space_id == ACPI_ADR_SPACE_FIXED_HARDWARE &&
805             policy->cpuinfo.transition_latency > 20 * 1000) {
806                 policy->cpuinfo.transition_latency = 20 * 1000;
807                 printk_once(KERN_INFO
808                             "P-state transition latency capped at 20 uS\n");
809         }
810
811         /* table init */
812         for (i = 0; i < perf->state_count; i++) {
813                 if (i > 0 && perf->states[i].core_frequency >=
814                     data->freq_table[valid_states-1].frequency / 1000)
815                         continue;
816
817                 data->freq_table[valid_states].index = i;
818                 data->freq_table[valid_states].frequency =
819                     perf->states[i].core_frequency * 1000;
820                 valid_states++;
821         }
822         data->freq_table[valid_states].frequency = CPUFREQ_TABLE_END;
823         perf->state = 0;
824
825         result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table);
826         if (result)
827                 goto err_freqfree;
828
829         if (perf->states[0].core_frequency * 1000 != policy->cpuinfo.max_freq)
830                 printk(KERN_WARNING FW_WARN "P-state 0 is not max freq\n");
831
832         switch (perf->control_register.space_id) {
833         case ACPI_ADR_SPACE_SYSTEM_IO:
834                 /* Current speed is unknown and not detectable by IO port */
835                 policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu);
836                 break;
837         case ACPI_ADR_SPACE_FIXED_HARDWARE:
838                 acpi_cpufreq_driver.get = get_cur_freq_on_cpu;
839                 policy->cur = get_cur_freq_on_cpu(cpu);
840                 break;
841         default:
842                 break;
843         }
844
845         /* notify BIOS that we exist */
846         acpi_processor_notify_smm(THIS_MODULE);
847
848         /* Check for APERF/MPERF support in hardware */
849         if (boot_cpu_has(X86_FEATURE_APERFMPERF))
850                 acpi_cpufreq_driver.getavg = cpufreq_get_measured_perf;
851
852         pr_debug("CPU%u - ACPI performance management activated.\n", cpu);
853         for (i = 0; i < perf->state_count; i++)
854                 pr_debug("     %cP%d: %d MHz, %d mW, %d uS\n",
855                         (i == perf->state ? '*' : ' '), i,
856                         (u32) perf->states[i].core_frequency,
857                         (u32) perf->states[i].power,
858                         (u32) perf->states[i].transition_latency);
859
860         cpufreq_frequency_table_get_attr(data->freq_table, policy->cpu);
861
862         /*
863          * the first call to ->target() should result in us actually
864          * writing something to the appropriate registers.
865          */
866         data->resume = 1;
867
868         return result;
869
870 err_freqfree:
871         kfree(data->freq_table);
872 err_unreg:
873         acpi_processor_unregister_performance(perf, cpu);
874 err_free:
875         kfree(data);
876         per_cpu(acfreq_data, cpu) = NULL;
877
878         return result;
879 }
880
881 static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy)
882 {
883         struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
884
885         pr_debug("acpi_cpufreq_cpu_exit\n");
886
887         if (data) {
888                 cpufreq_frequency_table_put_attr(policy->cpu);
889                 per_cpu(acfreq_data, policy->cpu) = NULL;
890                 acpi_processor_unregister_performance(data->acpi_data,
891                                                       policy->cpu);
892                 kfree(data->freq_table);
893                 kfree(data);
894         }
895
896         return 0;
897 }
898
899 static int acpi_cpufreq_resume(struct cpufreq_policy *policy)
900 {
901         struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
902
903         pr_debug("acpi_cpufreq_resume\n");
904
905         data->resume = 1;
906
907         return 0;
908 }
909
910 static struct freq_attr *acpi_cpufreq_attr[] = {
911         &cpufreq_freq_attr_scaling_available_freqs,
912         NULL,   /* this is a placeholder for cpb, do not remove */
913         NULL,
914 };
915
916 static struct cpufreq_driver acpi_cpufreq_driver = {
917         .verify         = acpi_cpufreq_verify,
918         .target         = acpi_cpufreq_target,
919         .bios_limit     = acpi_processor_get_bios_limit,
920         .init           = acpi_cpufreq_cpu_init,
921         .exit           = acpi_cpufreq_cpu_exit,
922         .resume         = acpi_cpufreq_resume,
923         .name           = "acpi-cpufreq",
924         .owner          = THIS_MODULE,
925         .attr           = acpi_cpufreq_attr,
926 };
927
928 static void __init acpi_cpufreq_boost_init(void)
929 {
930         if (boot_cpu_has(X86_FEATURE_CPB) || boot_cpu_has(X86_FEATURE_IDA)) {
931                 msrs = msrs_alloc();
932
933                 if (!msrs)
934                         return;
935
936                 boost_supported = true;
937                 boost_enabled = boost_state(0);
938
939                 get_online_cpus();
940
941                 /* Force all MSRs to the same value */
942                 boost_set_msrs(boost_enabled, cpu_online_mask);
943
944                 register_cpu_notifier(&boost_nb);
945
946                 put_online_cpus();
947         } else
948                 global_boost.attr.mode = 0444;
949
950         /* We create the boost file in any case, though for systems without
951          * hardware support it will be read-only and hardwired to return 0.
952          */
953         if (sysfs_create_file(cpufreq_global_kobject, &(global_boost.attr)))
954                 pr_warn(PFX "could not register global boost sysfs file\n");
955         else
956                 pr_debug("registered global boost sysfs file\n");
957 }
958
959 static void __exit acpi_cpufreq_boost_exit(void)
960 {
961         sysfs_remove_file(cpufreq_global_kobject, &(global_boost.attr));
962
963         if (msrs) {
964                 unregister_cpu_notifier(&boost_nb);
965
966                 msrs_free(msrs);
967                 msrs = NULL;
968         }
969 }
970
971 static int __init acpi_cpufreq_init(void)
972 {
973         int ret;
974
975         if (acpi_disabled)
976                 return 0;
977
978         pr_debug("acpi_cpufreq_init\n");
979
980         ret = acpi_cpufreq_early_init();
981         if (ret)
982                 return ret;
983
984 #ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
985         /* this is a sysfs file with a strange name and an even stranger
986          * semantic - per CPU instantiation, but system global effect.
987          * Lets enable it only on AMD CPUs for compatibility reasons and
988          * only if configured. This is considered legacy code, which
989          * will probably be removed at some point in the future.
990          */
991         if (check_amd_hwpstate_cpu(0)) {
992                 struct freq_attr **iter;
993
994                 pr_debug("adding sysfs entry for cpb\n");
995
996                 for (iter = acpi_cpufreq_attr; *iter != NULL; iter++)
997                         ;
998
999                 /* make sure there is a terminator behind it */
1000                 if (iter[1] == NULL)
1001                         *iter = &cpb;
1002         }
1003 #endif
1004
1005         ret = cpufreq_register_driver(&acpi_cpufreq_driver);
1006         if (ret)
1007                 free_acpi_perf_data();
1008         else
1009                 acpi_cpufreq_boost_init();
1010
1011         return ret;
1012 }
1013
1014 static void __exit acpi_cpufreq_exit(void)
1015 {
1016         pr_debug("acpi_cpufreq_exit\n");
1017
1018         acpi_cpufreq_boost_exit();
1019
1020         cpufreq_unregister_driver(&acpi_cpufreq_driver);
1021
1022         free_acpi_perf_data();
1023 }
1024
1025 module_param(acpi_pstate_strict, uint, 0644);
1026 MODULE_PARM_DESC(acpi_pstate_strict,
1027         "value 0 or non-zero. non-zero -> strict ACPI checks are "
1028         "performed during frequency changes.");
1029
1030 late_initcall(acpi_cpufreq_init);
1031 module_exit(acpi_cpufreq_exit);
1032
1033 static const struct x86_cpu_id acpi_cpufreq_ids[] = {
1034         X86_FEATURE_MATCH(X86_FEATURE_ACPI),
1035         X86_FEATURE_MATCH(X86_FEATURE_HW_PSTATE),
1036         {}
1037 };
1038 MODULE_DEVICE_TABLE(x86cpu, acpi_cpufreq_ids);
1039
1040 MODULE_ALIAS("acpi");