GNU Linux-libre 5.19-rc6-gnu
[releases.git] / drivers / cpufreq / acpi-cpufreq.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * acpi-cpufreq.c - ACPI Processor P-States Driver
4  *
5  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7  *  Copyright (C) 2002 - 2004 Dominik Brodowski <linux@brodo.de>
8  *  Copyright (C) 2006       Denis Sadykov <denis.m.sadykov@intel.com>
9  */
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/smp.h>
17 #include <linux/sched.h>
18 #include <linux/cpufreq.h>
19 #include <linux/compiler.h>
20 #include <linux/dmi.h>
21 #include <linux/slab.h>
22
23 #include <linux/acpi.h>
24 #include <linux/io.h>
25 #include <linux/delay.h>
26 #include <linux/uaccess.h>
27
28 #include <acpi/processor.h>
29 #include <acpi/cppc_acpi.h>
30
31 #include <asm/msr.h>
32 #include <asm/processor.h>
33 #include <asm/cpufeature.h>
34 #include <asm/cpu_device_id.h>
35
36 MODULE_AUTHOR("Paul Diefenbaugh, Dominik Brodowski");
37 MODULE_DESCRIPTION("ACPI Processor P-States Driver");
38 MODULE_LICENSE("GPL");
39
40 enum {
41         UNDEFINED_CAPABLE = 0,
42         SYSTEM_INTEL_MSR_CAPABLE,
43         SYSTEM_AMD_MSR_CAPABLE,
44         SYSTEM_IO_CAPABLE,
45 };
46
47 #define INTEL_MSR_RANGE         (0xffff)
48 #define AMD_MSR_RANGE           (0x7)
49 #define HYGON_MSR_RANGE         (0x7)
50
51 #define MSR_K7_HWCR_CPB_DIS     (1ULL << 25)
52
53 struct acpi_cpufreq_data {
54         unsigned int resume;
55         unsigned int cpu_feature;
56         unsigned int acpi_perf_cpu;
57         cpumask_var_t freqdomain_cpus;
58         void (*cpu_freq_write)(struct acpi_pct_register *reg, u32 val);
59         u32 (*cpu_freq_read)(struct acpi_pct_register *reg);
60 };
61
62 /* acpi_perf_data is a pointer to percpu data. */
63 static struct acpi_processor_performance __percpu *acpi_perf_data;
64
65 static inline struct acpi_processor_performance *to_perf_data(struct acpi_cpufreq_data *data)
66 {
67         return per_cpu_ptr(acpi_perf_data, data->acpi_perf_cpu);
68 }
69
70 static struct cpufreq_driver acpi_cpufreq_driver;
71
72 static unsigned int acpi_pstate_strict;
73
74 static bool boost_state(unsigned int cpu)
75 {
76         u32 lo, hi;
77         u64 msr;
78
79         switch (boot_cpu_data.x86_vendor) {
80         case X86_VENDOR_INTEL:
81                 rdmsr_on_cpu(cpu, MSR_IA32_MISC_ENABLE, &lo, &hi);
82                 msr = lo | ((u64)hi << 32);
83                 return !(msr & MSR_IA32_MISC_ENABLE_TURBO_DISABLE);
84         case X86_VENDOR_HYGON:
85         case X86_VENDOR_AMD:
86                 rdmsr_on_cpu(cpu, MSR_K7_HWCR, &lo, &hi);
87                 msr = lo | ((u64)hi << 32);
88                 return !(msr & MSR_K7_HWCR_CPB_DIS);
89         }
90         return false;
91 }
92
93 static int boost_set_msr(bool enable)
94 {
95         u32 msr_addr;
96         u64 msr_mask, val;
97
98         switch (boot_cpu_data.x86_vendor) {
99         case X86_VENDOR_INTEL:
100                 msr_addr = MSR_IA32_MISC_ENABLE;
101                 msr_mask = MSR_IA32_MISC_ENABLE_TURBO_DISABLE;
102                 break;
103         case X86_VENDOR_HYGON:
104         case X86_VENDOR_AMD:
105                 msr_addr = MSR_K7_HWCR;
106                 msr_mask = MSR_K7_HWCR_CPB_DIS;
107                 break;
108         default:
109                 return -EINVAL;
110         }
111
112         rdmsrl(msr_addr, val);
113
114         if (enable)
115                 val &= ~msr_mask;
116         else
117                 val |= msr_mask;
118
119         wrmsrl(msr_addr, val);
120         return 0;
121 }
122
123 static void boost_set_msr_each(void *p_en)
124 {
125         bool enable = (bool) p_en;
126
127         boost_set_msr(enable);
128 }
129
130 static int set_boost(struct cpufreq_policy *policy, int val)
131 {
132         on_each_cpu_mask(policy->cpus, boost_set_msr_each,
133                          (void *)(long)val, 1);
134         pr_debug("CPU %*pbl: Core Boosting %sabled.\n",
135                  cpumask_pr_args(policy->cpus), val ? "en" : "dis");
136
137         return 0;
138 }
139
140 static ssize_t show_freqdomain_cpus(struct cpufreq_policy *policy, char *buf)
141 {
142         struct acpi_cpufreq_data *data = policy->driver_data;
143
144         if (unlikely(!data))
145                 return -ENODEV;
146
147         return cpufreq_show_cpus(data->freqdomain_cpus, buf);
148 }
149
150 cpufreq_freq_attr_ro(freqdomain_cpus);
151
152 #ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
153 static ssize_t store_cpb(struct cpufreq_policy *policy, const char *buf,
154                          size_t count)
155 {
156         int ret;
157         unsigned int val = 0;
158
159         if (!acpi_cpufreq_driver.set_boost)
160                 return -EINVAL;
161
162         ret = kstrtouint(buf, 10, &val);
163         if (ret || val > 1)
164                 return -EINVAL;
165
166         cpus_read_lock();
167         set_boost(policy, val);
168         cpus_read_unlock();
169
170         return count;
171 }
172
173 static ssize_t show_cpb(struct cpufreq_policy *policy, char *buf)
174 {
175         return sprintf(buf, "%u\n", acpi_cpufreq_driver.boost_enabled);
176 }
177
178 cpufreq_freq_attr_rw(cpb);
179 #endif
180
181 static int check_est_cpu(unsigned int cpuid)
182 {
183         struct cpuinfo_x86 *cpu = &cpu_data(cpuid);
184
185         return cpu_has(cpu, X86_FEATURE_EST);
186 }
187
188 static int check_amd_hwpstate_cpu(unsigned int cpuid)
189 {
190         struct cpuinfo_x86 *cpu = &cpu_data(cpuid);
191
192         return cpu_has(cpu, X86_FEATURE_HW_PSTATE);
193 }
194
195 static unsigned extract_io(struct cpufreq_policy *policy, u32 value)
196 {
197         struct acpi_cpufreq_data *data = policy->driver_data;
198         struct acpi_processor_performance *perf;
199         int i;
200
201         perf = to_perf_data(data);
202
203         for (i = 0; i < perf->state_count; i++) {
204                 if (value == perf->states[i].status)
205                         return policy->freq_table[i].frequency;
206         }
207         return 0;
208 }
209
210 static unsigned extract_msr(struct cpufreq_policy *policy, u32 msr)
211 {
212         struct acpi_cpufreq_data *data = policy->driver_data;
213         struct cpufreq_frequency_table *pos;
214         struct acpi_processor_performance *perf;
215
216         if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
217                 msr &= AMD_MSR_RANGE;
218         else if (boot_cpu_data.x86_vendor == X86_VENDOR_HYGON)
219                 msr &= HYGON_MSR_RANGE;
220         else
221                 msr &= INTEL_MSR_RANGE;
222
223         perf = to_perf_data(data);
224
225         cpufreq_for_each_entry(pos, policy->freq_table)
226                 if (msr == perf->states[pos->driver_data].status)
227                         return pos->frequency;
228         return policy->freq_table[0].frequency;
229 }
230
231 static unsigned extract_freq(struct cpufreq_policy *policy, u32 val)
232 {
233         struct acpi_cpufreq_data *data = policy->driver_data;
234
235         switch (data->cpu_feature) {
236         case SYSTEM_INTEL_MSR_CAPABLE:
237         case SYSTEM_AMD_MSR_CAPABLE:
238                 return extract_msr(policy, val);
239         case SYSTEM_IO_CAPABLE:
240                 return extract_io(policy, val);
241         default:
242                 return 0;
243         }
244 }
245
246 static u32 cpu_freq_read_intel(struct acpi_pct_register *not_used)
247 {
248         u32 val, dummy __always_unused;
249
250         rdmsr(MSR_IA32_PERF_CTL, val, dummy);
251         return val;
252 }
253
254 static void cpu_freq_write_intel(struct acpi_pct_register *not_used, u32 val)
255 {
256         u32 lo, hi;
257
258         rdmsr(MSR_IA32_PERF_CTL, lo, hi);
259         lo = (lo & ~INTEL_MSR_RANGE) | (val & INTEL_MSR_RANGE);
260         wrmsr(MSR_IA32_PERF_CTL, lo, hi);
261 }
262
263 static u32 cpu_freq_read_amd(struct acpi_pct_register *not_used)
264 {
265         u32 val, dummy __always_unused;
266
267         rdmsr(MSR_AMD_PERF_CTL, val, dummy);
268         return val;
269 }
270
271 static void cpu_freq_write_amd(struct acpi_pct_register *not_used, u32 val)
272 {
273         wrmsr(MSR_AMD_PERF_CTL, val, 0);
274 }
275
276 static u32 cpu_freq_read_io(struct acpi_pct_register *reg)
277 {
278         u32 val;
279
280         acpi_os_read_port(reg->address, &val, reg->bit_width);
281         return val;
282 }
283
284 static void cpu_freq_write_io(struct acpi_pct_register *reg, u32 val)
285 {
286         acpi_os_write_port(reg->address, val, reg->bit_width);
287 }
288
289 struct drv_cmd {
290         struct acpi_pct_register *reg;
291         u32 val;
292         union {
293                 void (*write)(struct acpi_pct_register *reg, u32 val);
294                 u32 (*read)(struct acpi_pct_register *reg);
295         } func;
296 };
297
298 /* Called via smp_call_function_single(), on the target CPU */
299 static void do_drv_read(void *_cmd)
300 {
301         struct drv_cmd *cmd = _cmd;
302
303         cmd->val = cmd->func.read(cmd->reg);
304 }
305
306 static u32 drv_read(struct acpi_cpufreq_data *data, const struct cpumask *mask)
307 {
308         struct acpi_processor_performance *perf = to_perf_data(data);
309         struct drv_cmd cmd = {
310                 .reg = &perf->control_register,
311                 .func.read = data->cpu_freq_read,
312         };
313         int err;
314
315         err = smp_call_function_any(mask, do_drv_read, &cmd, 1);
316         WARN_ON_ONCE(err);      /* smp_call_function_any() was buggy? */
317         return cmd.val;
318 }
319
320 /* Called via smp_call_function_many(), on the target CPUs */
321 static void do_drv_write(void *_cmd)
322 {
323         struct drv_cmd *cmd = _cmd;
324
325         cmd->func.write(cmd->reg, cmd->val);
326 }
327
328 static void drv_write(struct acpi_cpufreq_data *data,
329                       const struct cpumask *mask, u32 val)
330 {
331         struct acpi_processor_performance *perf = to_perf_data(data);
332         struct drv_cmd cmd = {
333                 .reg = &perf->control_register,
334                 .val = val,
335                 .func.write = data->cpu_freq_write,
336         };
337         int this_cpu;
338
339         this_cpu = get_cpu();
340         if (cpumask_test_cpu(this_cpu, mask))
341                 do_drv_write(&cmd);
342
343         smp_call_function_many(mask, do_drv_write, &cmd, 1);
344         put_cpu();
345 }
346
347 static u32 get_cur_val(const struct cpumask *mask, struct acpi_cpufreq_data *data)
348 {
349         u32 val;
350
351         if (unlikely(cpumask_empty(mask)))
352                 return 0;
353
354         val = drv_read(data, mask);
355
356         pr_debug("%s = %u\n", __func__, val);
357
358         return val;
359 }
360
361 static unsigned int get_cur_freq_on_cpu(unsigned int cpu)
362 {
363         struct acpi_cpufreq_data *data;
364         struct cpufreq_policy *policy;
365         unsigned int freq;
366         unsigned int cached_freq;
367
368         pr_debug("%s (%d)\n", __func__, cpu);
369
370         policy = cpufreq_cpu_get_raw(cpu);
371         if (unlikely(!policy))
372                 return 0;
373
374         data = policy->driver_data;
375         if (unlikely(!data || !policy->freq_table))
376                 return 0;
377
378         cached_freq = policy->freq_table[to_perf_data(data)->state].frequency;
379         freq = extract_freq(policy, get_cur_val(cpumask_of(cpu), data));
380         if (freq != cached_freq) {
381                 /*
382                  * The dreaded BIOS frequency change behind our back.
383                  * Force set the frequency on next target call.
384                  */
385                 data->resume = 1;
386         }
387
388         pr_debug("cur freq = %u\n", freq);
389
390         return freq;
391 }
392
393 static unsigned int check_freqs(struct cpufreq_policy *policy,
394                                 const struct cpumask *mask, unsigned int freq)
395 {
396         struct acpi_cpufreq_data *data = policy->driver_data;
397         unsigned int cur_freq;
398         unsigned int i;
399
400         for (i = 0; i < 100; i++) {
401                 cur_freq = extract_freq(policy, get_cur_val(mask, data));
402                 if (cur_freq == freq)
403                         return 1;
404                 udelay(10);
405         }
406         return 0;
407 }
408
409 static int acpi_cpufreq_target(struct cpufreq_policy *policy,
410                                unsigned int index)
411 {
412         struct acpi_cpufreq_data *data = policy->driver_data;
413         struct acpi_processor_performance *perf;
414         const struct cpumask *mask;
415         unsigned int next_perf_state = 0; /* Index into perf table */
416         int result = 0;
417
418         if (unlikely(!data)) {
419                 return -ENODEV;
420         }
421
422         perf = to_perf_data(data);
423         next_perf_state = policy->freq_table[index].driver_data;
424         if (perf->state == next_perf_state) {
425                 if (unlikely(data->resume)) {
426                         pr_debug("Called after resume, resetting to P%d\n",
427                                 next_perf_state);
428                         data->resume = 0;
429                 } else {
430                         pr_debug("Already at target state (P%d)\n",
431                                 next_perf_state);
432                         return 0;
433                 }
434         }
435
436         /*
437          * The core won't allow CPUs to go away until the governor has been
438          * stopped, so we can rely on the stability of policy->cpus.
439          */
440         mask = policy->shared_type == CPUFREQ_SHARED_TYPE_ANY ?
441                 cpumask_of(policy->cpu) : policy->cpus;
442
443         drv_write(data, mask, perf->states[next_perf_state].control);
444
445         if (acpi_pstate_strict) {
446                 if (!check_freqs(policy, mask,
447                                  policy->freq_table[index].frequency)) {
448                         pr_debug("%s (%d)\n", __func__, policy->cpu);
449                         result = -EAGAIN;
450                 }
451         }
452
453         if (!result)
454                 perf->state = next_perf_state;
455
456         return result;
457 }
458
459 static unsigned int acpi_cpufreq_fast_switch(struct cpufreq_policy *policy,
460                                              unsigned int target_freq)
461 {
462         struct acpi_cpufreq_data *data = policy->driver_data;
463         struct acpi_processor_performance *perf;
464         struct cpufreq_frequency_table *entry;
465         unsigned int next_perf_state, next_freq, index;
466
467         /*
468          * Find the closest frequency above target_freq.
469          */
470         if (policy->cached_target_freq == target_freq)
471                 index = policy->cached_resolved_idx;
472         else
473                 index = cpufreq_table_find_index_dl(policy, target_freq,
474                                                     false);
475
476         entry = &policy->freq_table[index];
477         next_freq = entry->frequency;
478         next_perf_state = entry->driver_data;
479
480         perf = to_perf_data(data);
481         if (perf->state == next_perf_state) {
482                 if (unlikely(data->resume))
483                         data->resume = 0;
484                 else
485                         return next_freq;
486         }
487
488         data->cpu_freq_write(&perf->control_register,
489                              perf->states[next_perf_state].control);
490         perf->state = next_perf_state;
491         return next_freq;
492 }
493
494 static unsigned long
495 acpi_cpufreq_guess_freq(struct acpi_cpufreq_data *data, unsigned int cpu)
496 {
497         struct acpi_processor_performance *perf;
498
499         perf = to_perf_data(data);
500         if (cpu_khz) {
501                 /* search the closest match to cpu_khz */
502                 unsigned int i;
503                 unsigned long freq;
504                 unsigned long freqn = perf->states[0].core_frequency * 1000;
505
506                 for (i = 0; i < (perf->state_count-1); i++) {
507                         freq = freqn;
508                         freqn = perf->states[i+1].core_frequency * 1000;
509                         if ((2 * cpu_khz) > (freqn + freq)) {
510                                 perf->state = i;
511                                 return freq;
512                         }
513                 }
514                 perf->state = perf->state_count-1;
515                 return freqn;
516         } else {
517                 /* assume CPU is at P0... */
518                 perf->state = 0;
519                 return perf->states[0].core_frequency * 1000;
520         }
521 }
522
523 static void free_acpi_perf_data(void)
524 {
525         unsigned int i;
526
527         /* Freeing a NULL pointer is OK, and alloc_percpu zeroes. */
528         for_each_possible_cpu(i)
529                 free_cpumask_var(per_cpu_ptr(acpi_perf_data, i)
530                                  ->shared_cpu_map);
531         free_percpu(acpi_perf_data);
532 }
533
534 static int cpufreq_boost_online(unsigned int cpu)
535 {
536         /*
537          * On the CPU_UP path we simply keep the boost-disable flag
538          * in sync with the current global state.
539          */
540         return boost_set_msr(acpi_cpufreq_driver.boost_enabled);
541 }
542
543 static int cpufreq_boost_down_prep(unsigned int cpu)
544 {
545         /*
546          * Clear the boost-disable bit on the CPU_DOWN path so that
547          * this cpu cannot block the remaining ones from boosting.
548          */
549         return boost_set_msr(1);
550 }
551
552 /*
553  * acpi_cpufreq_early_init - initialize ACPI P-States library
554  *
555  * Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c)
556  * in order to determine correct frequency and voltage pairings. We can
557  * do _PDC and _PSD and find out the processor dependency for the
558  * actual init that will happen later...
559  */
560 static int __init acpi_cpufreq_early_init(void)
561 {
562         unsigned int i;
563         pr_debug("%s\n", __func__);
564
565         acpi_perf_data = alloc_percpu(struct acpi_processor_performance);
566         if (!acpi_perf_data) {
567                 pr_debug("Memory allocation error for acpi_perf_data.\n");
568                 return -ENOMEM;
569         }
570         for_each_possible_cpu(i) {
571                 if (!zalloc_cpumask_var_node(
572                         &per_cpu_ptr(acpi_perf_data, i)->shared_cpu_map,
573                         GFP_KERNEL, cpu_to_node(i))) {
574
575                         /* Freeing a NULL pointer is OK: alloc_percpu zeroes. */
576                         free_acpi_perf_data();
577                         return -ENOMEM;
578                 }
579         }
580
581         /* Do initialization in ACPI core */
582         acpi_processor_preregister_performance(acpi_perf_data);
583         return 0;
584 }
585
586 #ifdef CONFIG_SMP
587 /*
588  * Some BIOSes do SW_ANY coordination internally, either set it up in hw
589  * or do it in BIOS firmware and won't inform about it to OS. If not
590  * detected, this has a side effect of making CPU run at a different speed
591  * than OS intended it to run at. Detect it and handle it cleanly.
592  */
593 static int bios_with_sw_any_bug;
594
595 static int sw_any_bug_found(const struct dmi_system_id *d)
596 {
597         bios_with_sw_any_bug = 1;
598         return 0;
599 }
600
601 static const struct dmi_system_id sw_any_bug_dmi_table[] = {
602         {
603                 .callback = sw_any_bug_found,
604                 .ident = "Supermicro Server X6DLP",
605                 .matches = {
606                         DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
607                         DMI_MATCH(DMI_BIOS_VERSION, "080010"),
608                         DMI_MATCH(DMI_PRODUCT_NAME, "X6DLP"),
609                 },
610         },
611         { }
612 };
613
614 static int acpi_cpufreq_blacklist(struct cpuinfo_x86 *c)
615 {
616         /* Intel Xeon Processor 7100 Series Specification Update
617          * https://www.intel.com/Assets/PDF/specupdate/314554.pdf
618          * AL30: A Machine Check Exception (MCE) Occurring during an
619          * Enhanced Intel SpeedStep Technology Ratio Change May Cause
620          * Both Processor Cores to Lock Up. */
621         if (c->x86_vendor == X86_VENDOR_INTEL) {
622                 if ((c->x86 == 15) &&
623                     (c->x86_model == 6) &&
624                     (c->x86_stepping == 8)) {
625                         pr_info("Intel(R) Xeon(R) 7100 Errata AL30, processors may lock up on frequency changes: disabling acpi-cpufreq\n");
626                         return -ENODEV;
627                     }
628                 }
629         return 0;
630 }
631 #endif
632
633 #ifdef CONFIG_ACPI_CPPC_LIB
634 static u64 get_max_boost_ratio(unsigned int cpu)
635 {
636         struct cppc_perf_caps perf_caps;
637         u64 highest_perf, nominal_perf;
638         int ret;
639
640         if (acpi_pstate_strict)
641                 return 0;
642
643         ret = cppc_get_perf_caps(cpu, &perf_caps);
644         if (ret) {
645                 pr_debug("CPU%d: Unable to get performance capabilities (%d)\n",
646                          cpu, ret);
647                 return 0;
648         }
649
650         if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
651                 highest_perf = amd_get_highest_perf();
652         else
653                 highest_perf = perf_caps.highest_perf;
654
655         nominal_perf = perf_caps.nominal_perf;
656
657         if (!highest_perf || !nominal_perf) {
658                 pr_debug("CPU%d: highest or nominal performance missing\n", cpu);
659                 return 0;
660         }
661
662         if (highest_perf < nominal_perf) {
663                 pr_debug("CPU%d: nominal performance above highest\n", cpu);
664                 return 0;
665         }
666
667         return div_u64(highest_perf << SCHED_CAPACITY_SHIFT, nominal_perf);
668 }
669 #else
670 static inline u64 get_max_boost_ratio(unsigned int cpu) { return 0; }
671 #endif
672
673 static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
674 {
675         struct cpufreq_frequency_table *freq_table;
676         struct acpi_processor_performance *perf;
677         struct acpi_cpufreq_data *data;
678         unsigned int cpu = policy->cpu;
679         struct cpuinfo_x86 *c = &cpu_data(cpu);
680         unsigned int valid_states = 0;
681         unsigned int result = 0;
682         u64 max_boost_ratio;
683         unsigned int i;
684 #ifdef CONFIG_SMP
685         static int blacklisted;
686 #endif
687
688         pr_debug("%s\n", __func__);
689
690 #ifdef CONFIG_SMP
691         if (blacklisted)
692                 return blacklisted;
693         blacklisted = acpi_cpufreq_blacklist(c);
694         if (blacklisted)
695                 return blacklisted;
696 #endif
697
698         data = kzalloc(sizeof(*data), GFP_KERNEL);
699         if (!data)
700                 return -ENOMEM;
701
702         if (!zalloc_cpumask_var(&data->freqdomain_cpus, GFP_KERNEL)) {
703                 result = -ENOMEM;
704                 goto err_free;
705         }
706
707         perf = per_cpu_ptr(acpi_perf_data, cpu);
708         data->acpi_perf_cpu = cpu;
709         policy->driver_data = data;
710
711         if (cpu_has(c, X86_FEATURE_CONSTANT_TSC))
712                 acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS;
713
714         result = acpi_processor_register_performance(perf, cpu);
715         if (result)
716                 goto err_free_mask;
717
718         policy->shared_type = perf->shared_type;
719
720         /*
721          * Will let policy->cpus know about dependency only when software
722          * coordination is required.
723          */
724         if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL ||
725             policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) {
726                 cpumask_copy(policy->cpus, perf->shared_cpu_map);
727         }
728         cpumask_copy(data->freqdomain_cpus, perf->shared_cpu_map);
729
730 #ifdef CONFIG_SMP
731         dmi_check_system(sw_any_bug_dmi_table);
732         if (bios_with_sw_any_bug && !policy_is_shared(policy)) {
733                 policy->shared_type = CPUFREQ_SHARED_TYPE_ALL;
734                 cpumask_copy(policy->cpus, topology_core_cpumask(cpu));
735         }
736
737         if (check_amd_hwpstate_cpu(cpu) && boot_cpu_data.x86 < 0x19 &&
738             !acpi_pstate_strict) {
739                 cpumask_clear(policy->cpus);
740                 cpumask_set_cpu(cpu, policy->cpus);
741                 cpumask_copy(data->freqdomain_cpus,
742                              topology_sibling_cpumask(cpu));
743                 policy->shared_type = CPUFREQ_SHARED_TYPE_HW;
744                 pr_info_once("overriding BIOS provided _PSD data\n");
745         }
746 #endif
747
748         /* capability check */
749         if (perf->state_count <= 1) {
750                 pr_debug("No P-States\n");
751                 result = -ENODEV;
752                 goto err_unreg;
753         }
754
755         if (perf->control_register.space_id != perf->status_register.space_id) {
756                 result = -ENODEV;
757                 goto err_unreg;
758         }
759
760         switch (perf->control_register.space_id) {
761         case ACPI_ADR_SPACE_SYSTEM_IO:
762                 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
763                     boot_cpu_data.x86 == 0xf) {
764                         pr_debug("AMD K8 systems must use native drivers.\n");
765                         result = -ENODEV;
766                         goto err_unreg;
767                 }
768                 pr_debug("SYSTEM IO addr space\n");
769                 data->cpu_feature = SYSTEM_IO_CAPABLE;
770                 data->cpu_freq_read = cpu_freq_read_io;
771                 data->cpu_freq_write = cpu_freq_write_io;
772                 break;
773         case ACPI_ADR_SPACE_FIXED_HARDWARE:
774                 pr_debug("HARDWARE addr space\n");
775                 if (check_est_cpu(cpu)) {
776                         data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE;
777                         data->cpu_freq_read = cpu_freq_read_intel;
778                         data->cpu_freq_write = cpu_freq_write_intel;
779                         break;
780                 }
781                 if (check_amd_hwpstate_cpu(cpu)) {
782                         data->cpu_feature = SYSTEM_AMD_MSR_CAPABLE;
783                         data->cpu_freq_read = cpu_freq_read_amd;
784                         data->cpu_freq_write = cpu_freq_write_amd;
785                         break;
786                 }
787                 result = -ENODEV;
788                 goto err_unreg;
789         default:
790                 pr_debug("Unknown addr space %d\n",
791                         (u32) (perf->control_register.space_id));
792                 result = -ENODEV;
793                 goto err_unreg;
794         }
795
796         freq_table = kcalloc(perf->state_count + 1, sizeof(*freq_table),
797                              GFP_KERNEL);
798         if (!freq_table) {
799                 result = -ENOMEM;
800                 goto err_unreg;
801         }
802
803         /* detect transition latency */
804         policy->cpuinfo.transition_latency = 0;
805         for (i = 0; i < perf->state_count; i++) {
806                 if ((perf->states[i].transition_latency * 1000) >
807                     policy->cpuinfo.transition_latency)
808                         policy->cpuinfo.transition_latency =
809                             perf->states[i].transition_latency * 1000;
810         }
811
812         /* Check for high latency (>20uS) from buggy BIOSes, like on T42 */
813         if (perf->control_register.space_id == ACPI_ADR_SPACE_FIXED_HARDWARE &&
814             policy->cpuinfo.transition_latency > 20 * 1000) {
815                 policy->cpuinfo.transition_latency = 20 * 1000;
816                 pr_info_once("P-state transition latency capped at 20 uS\n");
817         }
818
819         /* table init */
820         for (i = 0; i < perf->state_count; i++) {
821                 if (i > 0 && perf->states[i].core_frequency >=
822                     freq_table[valid_states-1].frequency / 1000)
823                         continue;
824
825                 freq_table[valid_states].driver_data = i;
826                 freq_table[valid_states].frequency =
827                     perf->states[i].core_frequency * 1000;
828                 valid_states++;
829         }
830         freq_table[valid_states].frequency = CPUFREQ_TABLE_END;
831
832         max_boost_ratio = get_max_boost_ratio(cpu);
833         if (max_boost_ratio) {
834                 unsigned int freq = freq_table[0].frequency;
835
836                 /*
837                  * Because the loop above sorts the freq_table entries in the
838                  * descending order, freq is the maximum frequency in the table.
839                  * Assume that it corresponds to the CPPC nominal frequency and
840                  * use it to set cpuinfo.max_freq.
841                  */
842                 policy->cpuinfo.max_freq = freq * max_boost_ratio >> SCHED_CAPACITY_SHIFT;
843         } else {
844                 /*
845                  * If the maximum "boost" frequency is unknown, ask the arch
846                  * scale-invariance code to use the "nominal" performance for
847                  * CPU utilization scaling so as to prevent the schedutil
848                  * governor from selecting inadequate CPU frequencies.
849                  */
850                 arch_set_max_freq_ratio(true);
851         }
852
853         policy->freq_table = freq_table;
854         perf->state = 0;
855
856         switch (perf->control_register.space_id) {
857         case ACPI_ADR_SPACE_SYSTEM_IO:
858                 /*
859                  * The core will not set policy->cur, because
860                  * cpufreq_driver->get is NULL, so we need to set it here.
861                  * However, we have to guess it, because the current speed is
862                  * unknown and not detectable via IO ports.
863                  */
864                 policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu);
865                 break;
866         case ACPI_ADR_SPACE_FIXED_HARDWARE:
867                 acpi_cpufreq_driver.get = get_cur_freq_on_cpu;
868                 break;
869         default:
870                 break;
871         }
872
873         /* notify BIOS that we exist */
874         acpi_processor_notify_smm(THIS_MODULE);
875
876         pr_debug("CPU%u - ACPI performance management activated.\n", cpu);
877         for (i = 0; i < perf->state_count; i++)
878                 pr_debug("     %cP%d: %d MHz, %d mW, %d uS\n",
879                         (i == perf->state ? '*' : ' '), i,
880                         (u32) perf->states[i].core_frequency,
881                         (u32) perf->states[i].power,
882                         (u32) perf->states[i].transition_latency);
883
884         /*
885          * the first call to ->target() should result in us actually
886          * writing something to the appropriate registers.
887          */
888         data->resume = 1;
889
890         policy->fast_switch_possible = !acpi_pstate_strict &&
891                 !(policy_is_shared(policy) && policy->shared_type != CPUFREQ_SHARED_TYPE_ANY);
892
893         if (perf->states[0].core_frequency * 1000 != freq_table[0].frequency)
894                 pr_warn(FW_WARN "P-state 0 is not max freq\n");
895
896         return result;
897
898 err_unreg:
899         acpi_processor_unregister_performance(cpu);
900 err_free_mask:
901         free_cpumask_var(data->freqdomain_cpus);
902 err_free:
903         kfree(data);
904         policy->driver_data = NULL;
905
906         return result;
907 }
908
909 static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy)
910 {
911         struct acpi_cpufreq_data *data = policy->driver_data;
912
913         pr_debug("%s\n", __func__);
914
915         policy->fast_switch_possible = false;
916         policy->driver_data = NULL;
917         acpi_processor_unregister_performance(data->acpi_perf_cpu);
918         free_cpumask_var(data->freqdomain_cpus);
919         kfree(policy->freq_table);
920         kfree(data);
921
922         return 0;
923 }
924
925 static int acpi_cpufreq_resume(struct cpufreq_policy *policy)
926 {
927         struct acpi_cpufreq_data *data = policy->driver_data;
928
929         pr_debug("%s\n", __func__);
930
931         data->resume = 1;
932
933         return 0;
934 }
935
936 static struct freq_attr *acpi_cpufreq_attr[] = {
937         &cpufreq_freq_attr_scaling_available_freqs,
938         &freqdomain_cpus,
939 #ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
940         &cpb,
941 #endif
942         NULL,
943 };
944
945 static struct cpufreq_driver acpi_cpufreq_driver = {
946         .verify         = cpufreq_generic_frequency_table_verify,
947         .target_index   = acpi_cpufreq_target,
948         .fast_switch    = acpi_cpufreq_fast_switch,
949         .bios_limit     = acpi_processor_get_bios_limit,
950         .init           = acpi_cpufreq_cpu_init,
951         .exit           = acpi_cpufreq_cpu_exit,
952         .resume         = acpi_cpufreq_resume,
953         .name           = "acpi-cpufreq",
954         .attr           = acpi_cpufreq_attr,
955 };
956
957 static enum cpuhp_state acpi_cpufreq_online;
958
959 static void __init acpi_cpufreq_boost_init(void)
960 {
961         int ret;
962
963         if (!(boot_cpu_has(X86_FEATURE_CPB) || boot_cpu_has(X86_FEATURE_IDA))) {
964                 pr_debug("Boost capabilities not present in the processor\n");
965                 return;
966         }
967
968         acpi_cpufreq_driver.set_boost = set_boost;
969         acpi_cpufreq_driver.boost_enabled = boost_state(0);
970
971         /*
972          * This calls the online callback on all online cpu and forces all
973          * MSRs to the same value.
974          */
975         ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "cpufreq/acpi:online",
976                                 cpufreq_boost_online, cpufreq_boost_down_prep);
977         if (ret < 0) {
978                 pr_err("acpi_cpufreq: failed to register hotplug callbacks\n");
979                 return;
980         }
981         acpi_cpufreq_online = ret;
982 }
983
984 static void acpi_cpufreq_boost_exit(void)
985 {
986         if (acpi_cpufreq_online > 0)
987                 cpuhp_remove_state_nocalls(acpi_cpufreq_online);
988 }
989
990 static int __init acpi_cpufreq_init(void)
991 {
992         int ret;
993
994         if (acpi_disabled)
995                 return -ENODEV;
996
997         /* don't keep reloading if cpufreq_driver exists */
998         if (cpufreq_get_current_driver())
999                 return -EEXIST;
1000
1001         pr_debug("%s\n", __func__);
1002
1003         ret = acpi_cpufreq_early_init();
1004         if (ret)
1005                 return ret;
1006
1007 #ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
1008         /* this is a sysfs file with a strange name and an even stranger
1009          * semantic - per CPU instantiation, but system global effect.
1010          * Lets enable it only on AMD CPUs for compatibility reasons and
1011          * only if configured. This is considered legacy code, which
1012          * will probably be removed at some point in the future.
1013          */
1014         if (!check_amd_hwpstate_cpu(0)) {
1015                 struct freq_attr **attr;
1016
1017                 pr_debug("CPB unsupported, do not expose it\n");
1018
1019                 for (attr = acpi_cpufreq_attr; *attr; attr++)
1020                         if (*attr == &cpb) {
1021                                 *attr = NULL;
1022                                 break;
1023                         }
1024         }
1025 #endif
1026         acpi_cpufreq_boost_init();
1027
1028         ret = cpufreq_register_driver(&acpi_cpufreq_driver);
1029         if (ret) {
1030                 free_acpi_perf_data();
1031                 acpi_cpufreq_boost_exit();
1032         }
1033         return ret;
1034 }
1035
1036 static void __exit acpi_cpufreq_exit(void)
1037 {
1038         pr_debug("%s\n", __func__);
1039
1040         acpi_cpufreq_boost_exit();
1041
1042         cpufreq_unregister_driver(&acpi_cpufreq_driver);
1043
1044         free_acpi_perf_data();
1045 }
1046
1047 module_param(acpi_pstate_strict, uint, 0644);
1048 MODULE_PARM_DESC(acpi_pstate_strict,
1049         "value 0 or non-zero. non-zero -> strict ACPI checks are "
1050         "performed during frequency changes.");
1051
1052 late_initcall(acpi_cpufreq_init);
1053 module_exit(acpi_cpufreq_exit);
1054
1055 static const struct x86_cpu_id __maybe_unused acpi_cpufreq_ids[] = {
1056         X86_MATCH_FEATURE(X86_FEATURE_ACPI, NULL),
1057         X86_MATCH_FEATURE(X86_FEATURE_HW_PSTATE, NULL),
1058         {}
1059 };
1060 MODULE_DEVICE_TABLE(x86cpu, acpi_cpufreq_ids);
1061
1062 static const struct acpi_device_id __maybe_unused processor_device_ids[] = {
1063         {ACPI_PROCESSOR_OBJECT_HID, },
1064         {ACPI_PROCESSOR_DEVICE_HID, },
1065         {},
1066 };
1067 MODULE_DEVICE_TABLE(acpi, processor_device_ids);
1068
1069 MODULE_ALIAS("acpi");