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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#include <linux/string_helpers.h>
23#include <linux/platform_device.h>
24
25#include <linux/acpi.h>
26#include <linux/io.h>
27#include <linux/delay.h>
28#include <linux/uaccess.h>
29
30#include <acpi/processor.h>
31#include <acpi/cppc_acpi.h>
32
33#include <asm/msr.h>
34#include <asm/processor.h>
35#include <asm/cpufeature.h>
36#include <asm/cpu_device_id.h>
37
38MODULE_AUTHOR("Paul Diefenbaugh, Dominik Brodowski");
39MODULE_DESCRIPTION("ACPI Processor P-States Driver");
40MODULE_LICENSE("GPL");
41
42enum {
43 UNDEFINED_CAPABLE = 0,
44 SYSTEM_INTEL_MSR_CAPABLE,
45 SYSTEM_AMD_MSR_CAPABLE,
46 SYSTEM_IO_CAPABLE,
47};
48
49#define INTEL_MSR_RANGE (0xffff)
50#define AMD_MSR_RANGE (0x7)
51#define HYGON_MSR_RANGE (0x7)
52
53#define MSR_K7_HWCR_CPB_DIS (1ULL << 25)
54
55struct acpi_cpufreq_data {
56 unsigned int resume;
57 unsigned int cpu_feature;
58 unsigned int acpi_perf_cpu;
59 cpumask_var_t freqdomain_cpus;
60 void (*cpu_freq_write)(struct acpi_pct_register *reg, u32 val);
61 u32 (*cpu_freq_read)(struct acpi_pct_register *reg);
62};
63
64/* acpi_perf_data is a pointer to percpu data. */
65static struct acpi_processor_performance __percpu *acpi_perf_data;
66
67static inline struct acpi_processor_performance *to_perf_data(struct acpi_cpufreq_data *data)
68{
69 return per_cpu_ptr(acpi_perf_data, data->acpi_perf_cpu);
70}
71
72static struct cpufreq_driver acpi_cpufreq_driver;
73
74static unsigned int acpi_pstate_strict;
75
76static bool boost_state(unsigned int cpu)
77{
78 u32 lo, hi;
79 u64 msr;
80
81 switch (boot_cpu_data.x86_vendor) {
82 case X86_VENDOR_INTEL:
83 case X86_VENDOR_CENTAUR:
84 case X86_VENDOR_ZHAOXIN:
85 rdmsr_on_cpu(cpu, MSR_IA32_MISC_ENABLE, &lo, &hi);
86 msr = lo | ((u64)hi << 32);
87 return !(msr & MSR_IA32_MISC_ENABLE_TURBO_DISABLE);
88 case X86_VENDOR_HYGON:
89 case X86_VENDOR_AMD:
90 rdmsr_on_cpu(cpu, MSR_K7_HWCR, &lo, &hi);
91 msr = lo | ((u64)hi << 32);
92 return !(msr & MSR_K7_HWCR_CPB_DIS);
93 }
94 return false;
95}
96
97static int boost_set_msr(bool enable)
98{
99 u32 msr_addr;
100 u64 msr_mask, val;
101
102 switch (boot_cpu_data.x86_vendor) {
103 case X86_VENDOR_INTEL:
104 case X86_VENDOR_CENTAUR:
105 case X86_VENDOR_ZHAOXIN:
106 msr_addr = MSR_IA32_MISC_ENABLE;
107 msr_mask = MSR_IA32_MISC_ENABLE_TURBO_DISABLE;
108 break;
109 case X86_VENDOR_HYGON:
110 case X86_VENDOR_AMD:
111 msr_addr = MSR_K7_HWCR;
112 msr_mask = MSR_K7_HWCR_CPB_DIS;
113 break;
114 default:
115 return -EINVAL;
116 }
117
118 rdmsrl(msr_addr, val);
119
120 if (enable)
121 val &= ~msr_mask;
122 else
123 val |= msr_mask;
124
125 wrmsrl(msr_addr, val);
126 return 0;
127}
128
129static void boost_set_msr_each(void *p_en)
130{
131 bool enable = (bool) p_en;
132
133 boost_set_msr(enable);
134}
135
136static int set_boost(struct cpufreq_policy *policy, int val)
137{
138 on_each_cpu_mask(policy->cpus, boost_set_msr_each,
139 (void *)(long)val, 1);
140 pr_debug("CPU %*pbl: Core Boosting %s.\n",
141 cpumask_pr_args(policy->cpus), str_enabled_disabled(val));
142
143 return 0;
144}
145
146static ssize_t show_freqdomain_cpus(struct cpufreq_policy *policy, char *buf)
147{
148 struct acpi_cpufreq_data *data = policy->driver_data;
149
150 if (unlikely(!data))
151 return -ENODEV;
152
153 return cpufreq_show_cpus(data->freqdomain_cpus, buf);
154}
155
156cpufreq_freq_attr_ro(freqdomain_cpus);
157
158#ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
159static ssize_t store_cpb(struct cpufreq_policy *policy, const char *buf,
160 size_t count)
161{
162 int ret;
163 unsigned int val = 0;
164
165 if (!acpi_cpufreq_driver.set_boost)
166 return -EINVAL;
167
168 ret = kstrtouint(buf, 10, &val);
169 if (ret || val > 1)
170 return -EINVAL;
171
172 cpus_read_lock();
173 set_boost(policy, val);
174 cpus_read_unlock();
175
176 return count;
177}
178
179static ssize_t show_cpb(struct cpufreq_policy *policy, char *buf)
180{
181 return sprintf(buf, "%u\n", acpi_cpufreq_driver.boost_enabled);
182}
183
184cpufreq_freq_attr_rw(cpb);
185#endif
186
187static int check_est_cpu(unsigned int cpuid)
188{
189 struct cpuinfo_x86 *cpu = &cpu_data(cpuid);
190
191 return cpu_has(cpu, X86_FEATURE_EST);
192}
193
194static int check_amd_hwpstate_cpu(unsigned int cpuid)
195{
196 struct cpuinfo_x86 *cpu = &cpu_data(cpuid);
197
198 return cpu_has(cpu, X86_FEATURE_HW_PSTATE);
199}
200
201static unsigned extract_io(struct cpufreq_policy *policy, u32 value)
202{
203 struct acpi_cpufreq_data *data = policy->driver_data;
204 struct acpi_processor_performance *perf;
205 int i;
206
207 perf = to_perf_data(data);
208
209 for (i = 0; i < perf->state_count; i++) {
210 if (value == perf->states[i].status)
211 return policy->freq_table[i].frequency;
212 }
213 return 0;
214}
215
216static unsigned extract_msr(struct cpufreq_policy *policy, u32 msr)
217{
218 struct acpi_cpufreq_data *data = policy->driver_data;
219 struct cpufreq_frequency_table *pos;
220 struct acpi_processor_performance *perf;
221
222 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
223 msr &= AMD_MSR_RANGE;
224 else if (boot_cpu_data.x86_vendor == X86_VENDOR_HYGON)
225 msr &= HYGON_MSR_RANGE;
226 else
227 msr &= INTEL_MSR_RANGE;
228
229 perf = to_perf_data(data);
230
231 cpufreq_for_each_entry(pos, policy->freq_table)
232 if (msr == perf->states[pos->driver_data].status)
233 return pos->frequency;
234 return policy->freq_table[0].frequency;
235}
236
237static unsigned extract_freq(struct cpufreq_policy *policy, u32 val)
238{
239 struct acpi_cpufreq_data *data = policy->driver_data;
240
241 switch (data->cpu_feature) {
242 case SYSTEM_INTEL_MSR_CAPABLE:
243 case SYSTEM_AMD_MSR_CAPABLE:
244 return extract_msr(policy, val);
245 case SYSTEM_IO_CAPABLE:
246 return extract_io(policy, val);
247 default:
248 return 0;
249 }
250}
251
252static u32 cpu_freq_read_intel(struct acpi_pct_register *not_used)
253{
254 u32 val, dummy __always_unused;
255
256 rdmsr(MSR_IA32_PERF_CTL, val, dummy);
257 return val;
258}
259
260static void cpu_freq_write_intel(struct acpi_pct_register *not_used, u32 val)
261{
262 u32 lo, hi;
263
264 rdmsr(MSR_IA32_PERF_CTL, lo, hi);
265 lo = (lo & ~INTEL_MSR_RANGE) | (val & INTEL_MSR_RANGE);
266 wrmsr(MSR_IA32_PERF_CTL, lo, hi);
267}
268
269static u32 cpu_freq_read_amd(struct acpi_pct_register *not_used)
270{
271 u32 val, dummy __always_unused;
272
273 rdmsr(MSR_AMD_PERF_CTL, val, dummy);
274 return val;
275}
276
277static void cpu_freq_write_amd(struct acpi_pct_register *not_used, u32 val)
278{
279 wrmsr(MSR_AMD_PERF_CTL, val, 0);
280}
281
282static u32 cpu_freq_read_io(struct acpi_pct_register *reg)
283{
284 u32 val;
285
286 acpi_os_read_port(reg->address, &val, reg->bit_width);
287 return val;
288}
289
290static void cpu_freq_write_io(struct acpi_pct_register *reg, u32 val)
291{
292 acpi_os_write_port(reg->address, val, reg->bit_width);
293}
294
295struct drv_cmd {
296 struct acpi_pct_register *reg;
297 u32 val;
298 union {
299 void (*write)(struct acpi_pct_register *reg, u32 val);
300 u32 (*read)(struct acpi_pct_register *reg);
301 } func;
302};
303
304/* Called via smp_call_function_single(), on the target CPU */
305static void do_drv_read(void *_cmd)
306{
307 struct drv_cmd *cmd = _cmd;
308
309 cmd->val = cmd->func.read(cmd->reg);
310}
311
312static u32 drv_read(struct acpi_cpufreq_data *data, const struct cpumask *mask)
313{
314 struct acpi_processor_performance *perf = to_perf_data(data);
315 struct drv_cmd cmd = {
316 .reg = &perf->control_register,
317 .func.read = data->cpu_freq_read,
318 };
319 int err;
320
321 err = smp_call_function_any(mask, do_drv_read, &cmd, 1);
322 WARN_ON_ONCE(err); /* smp_call_function_any() was buggy? */
323 return cmd.val;
324}
325
326/* Called via smp_call_function_many(), on the target CPUs */
327static void do_drv_write(void *_cmd)
328{
329 struct drv_cmd *cmd = _cmd;
330
331 cmd->func.write(cmd->reg, cmd->val);
332}
333
334static void drv_write(struct acpi_cpufreq_data *data,
335 const struct cpumask *mask, u32 val)
336{
337 struct acpi_processor_performance *perf = to_perf_data(data);
338 struct drv_cmd cmd = {
339 .reg = &perf->control_register,
340 .val = val,
341 .func.write = data->cpu_freq_write,
342 };
343 int this_cpu;
344
345 this_cpu = get_cpu();
346 if (cpumask_test_cpu(this_cpu, mask))
347 do_drv_write(&cmd);
348
349 smp_call_function_many(mask, do_drv_write, &cmd, 1);
350 put_cpu();
351}
352
353static u32 get_cur_val(const struct cpumask *mask, struct acpi_cpufreq_data *data)
354{
355 u32 val;
356
357 if (unlikely(cpumask_empty(mask)))
358 return 0;
359
360 val = drv_read(data, mask);
361
362 pr_debug("%s = %u\n", __func__, val);
363
364 return val;
365}
366
367static unsigned int get_cur_freq_on_cpu(unsigned int cpu)
368{
369 struct acpi_cpufreq_data *data;
370 struct cpufreq_policy *policy;
371 unsigned int freq;
372 unsigned int cached_freq;
373
374 pr_debug("%s (%d)\n", __func__, cpu);
375
376 policy = cpufreq_cpu_get_raw(cpu);
377 if (unlikely(!policy))
378 return 0;
379
380 data = policy->driver_data;
381 if (unlikely(!data || !policy->freq_table))
382 return 0;
383
384 cached_freq = policy->freq_table[to_perf_data(data)->state].frequency;
385 freq = extract_freq(policy, get_cur_val(cpumask_of(cpu), data));
386 if (freq != cached_freq) {
387 /*
388 * The dreaded BIOS frequency change behind our back.
389 * Force set the frequency on next target call.
390 */
391 data->resume = 1;
392 }
393
394 pr_debug("cur freq = %u\n", freq);
395
396 return freq;
397}
398
399static unsigned int check_freqs(struct cpufreq_policy *policy,
400 const struct cpumask *mask, unsigned int freq)
401{
402 struct acpi_cpufreq_data *data = policy->driver_data;
403 unsigned int cur_freq;
404 unsigned int i;
405
406 for (i = 0; i < 100; i++) {
407 cur_freq = extract_freq(policy, get_cur_val(mask, data));
408 if (cur_freq == freq)
409 return 1;
410 udelay(10);
411 }
412 return 0;
413}
414
415static int acpi_cpufreq_target(struct cpufreq_policy *policy,
416 unsigned int index)
417{
418 struct acpi_cpufreq_data *data = policy->driver_data;
419 struct acpi_processor_performance *perf;
420 const struct cpumask *mask;
421 unsigned int next_perf_state = 0; /* Index into perf table */
422 int result = 0;
423
424 if (unlikely(!data)) {
425 return -ENODEV;
426 }
427
428 perf = to_perf_data(data);
429 next_perf_state = policy->freq_table[index].driver_data;
430 if (perf->state == next_perf_state) {
431 if (unlikely(data->resume)) {
432 pr_debug("Called after resume, resetting to P%d\n",
433 next_perf_state);
434 data->resume = 0;
435 } else {
436 pr_debug("Already at target state (P%d)\n",
437 next_perf_state);
438 return 0;
439 }
440 }
441
442 /*
443 * The core won't allow CPUs to go away until the governor has been
444 * stopped, so we can rely on the stability of policy->cpus.
445 */
446 mask = policy->shared_type == CPUFREQ_SHARED_TYPE_ANY ?
447 cpumask_of(policy->cpu) : policy->cpus;
448
449 drv_write(data, mask, perf->states[next_perf_state].control);
450
451 if (acpi_pstate_strict) {
452 if (!check_freqs(policy, mask,
453 policy->freq_table[index].frequency)) {
454 pr_debug("%s (%d)\n", __func__, policy->cpu);
455 result = -EAGAIN;
456 }
457 }
458
459 if (!result)
460 perf->state = next_perf_state;
461
462 return result;
463}
464
465static unsigned int acpi_cpufreq_fast_switch(struct cpufreq_policy *policy,
466 unsigned int target_freq)
467{
468 struct acpi_cpufreq_data *data = policy->driver_data;
469 struct acpi_processor_performance *perf;
470 struct cpufreq_frequency_table *entry;
471 unsigned int next_perf_state, next_freq, index;
472
473 /*
474 * Find the closest frequency above target_freq.
475 */
476 if (policy->cached_target_freq == target_freq)
477 index = policy->cached_resolved_idx;
478 else
479 index = cpufreq_table_find_index_dl(policy, target_freq,
480 false);
481
482 entry = &policy->freq_table[index];
483 next_freq = entry->frequency;
484 next_perf_state = entry->driver_data;
485
486 perf = to_perf_data(data);
487 if (perf->state == next_perf_state) {
488 if (unlikely(data->resume))
489 data->resume = 0;
490 else
491 return next_freq;
492 }
493
494 data->cpu_freq_write(&perf->control_register,
495 perf->states[next_perf_state].control);
496 perf->state = next_perf_state;
497 return next_freq;
498}
499
500static unsigned long
501acpi_cpufreq_guess_freq(struct acpi_cpufreq_data *data, unsigned int cpu)
502{
503 struct acpi_processor_performance *perf;
504
505 perf = to_perf_data(data);
506 if (cpu_khz) {
507 /* search the closest match to cpu_khz */
508 unsigned int i;
509 unsigned long freq;
510 unsigned long freqn = perf->states[0].core_frequency * 1000;
511
512 for (i = 0; i < (perf->state_count-1); i++) {
513 freq = freqn;
514 freqn = perf->states[i+1].core_frequency * 1000;
515 if ((2 * cpu_khz) > (freqn + freq)) {
516 perf->state = i;
517 return freq;
518 }
519 }
520 perf->state = perf->state_count-1;
521 return freqn;
522 } else {
523 /* assume CPU is at P0... */
524 perf->state = 0;
525 return perf->states[0].core_frequency * 1000;
526 }
527}
528
529static void free_acpi_perf_data(void)
530{
531 unsigned int i;
532
533 /* Freeing a NULL pointer is OK, and alloc_percpu zeroes. */
534 for_each_possible_cpu(i)
535 free_cpumask_var(per_cpu_ptr(acpi_perf_data, i)
536 ->shared_cpu_map);
537 free_percpu(acpi_perf_data);
538}
539
540static int cpufreq_boost_down_prep(unsigned int cpu)
541{
542 /*
543 * Clear the boost-disable bit on the CPU_DOWN path so that
544 * this cpu cannot block the remaining ones from boosting.
545 */
546 return boost_set_msr(1);
547}
548
549/*
550 * acpi_cpufreq_early_init - initialize ACPI P-States library
551 *
552 * Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c)
553 * in order to determine correct frequency and voltage pairings. We can
554 * do _PDC and _PSD and find out the processor dependency for the
555 * actual init that will happen later...
556 */
557static int __init acpi_cpufreq_early_init(void)
558{
559 unsigned int i;
560 pr_debug("%s\n", __func__);
561
562 acpi_perf_data = alloc_percpu(struct acpi_processor_performance);
563 if (!acpi_perf_data) {
564 pr_debug("Memory allocation error for acpi_perf_data.\n");
565 return -ENOMEM;
566 }
567 for_each_possible_cpu(i) {
568 if (!zalloc_cpumask_var_node(
569 &per_cpu_ptr(acpi_perf_data, i)->shared_cpu_map,
570 GFP_KERNEL, cpu_to_node(i))) {
571
572 /* Freeing a NULL pointer is OK: alloc_percpu zeroes. */
573 free_acpi_perf_data();
574 return -ENOMEM;
575 }
576 }
577
578 /* Do initialization in ACPI core */
579 acpi_processor_preregister_performance(acpi_perf_data);
580 return 0;
581}
582
583#ifdef CONFIG_SMP
584/*
585 * Some BIOSes do SW_ANY coordination internally, either set it up in hw
586 * or do it in BIOS firmware and won't inform about it to OS. If not
587 * detected, this has a side effect of making CPU run at a different speed
588 * than OS intended it to run at. Detect it and handle it cleanly.
589 */
590static int bios_with_sw_any_bug;
591
592static int sw_any_bug_found(const struct dmi_system_id *d)
593{
594 bios_with_sw_any_bug = 1;
595 return 0;
596}
597
598static const struct dmi_system_id sw_any_bug_dmi_table[] = {
599 {
600 .callback = sw_any_bug_found,
601 .ident = "Supermicro Server X6DLP",
602 .matches = {
603 DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
604 DMI_MATCH(DMI_BIOS_VERSION, "080010"),
605 DMI_MATCH(DMI_PRODUCT_NAME, "X6DLP"),
606 },
607 },
608 { }
609};
610
611static int acpi_cpufreq_blacklist(struct cpuinfo_x86 *c)
612{
613 /* Intel Xeon Processor 7100 Series Specification Update
614 * https://www.intel.com/Assets/PDF/specupdate/314554.pdf
615 * AL30: A Machine Check Exception (MCE) Occurring during an
616 * Enhanced Intel SpeedStep Technology Ratio Change May Cause
617 * Both Processor Cores to Lock Up. */
618 if (c->x86_vendor == X86_VENDOR_INTEL) {
619 if ((c->x86 == 15) &&
620 (c->x86_model == 6) &&
621 (c->x86_stepping == 8)) {
622 pr_info("Intel(R) Xeon(R) 7100 Errata AL30, processors may lock up on frequency changes: disabling acpi-cpufreq\n");
623 return -ENODEV;
624 }
625 }
626 return 0;
627}
628#endif
629
630#ifdef CONFIG_ACPI_CPPC_LIB
631static u64 get_max_boost_ratio(unsigned int cpu)
632{
633 struct cppc_perf_caps perf_caps;
634 u64 highest_perf, nominal_perf;
635 int ret;
636
637 if (acpi_pstate_strict)
638 return 0;
639
640 ret = cppc_get_perf_caps(cpu, &perf_caps);
641 if (ret) {
642 pr_debug("CPU%d: Unable to get performance capabilities (%d)\n",
643 cpu, ret);
644 return 0;
645 }
646
647 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
648 highest_perf = amd_get_highest_perf();
649 else
650 highest_perf = perf_caps.highest_perf;
651
652 nominal_perf = perf_caps.nominal_perf;
653
654 if (!highest_perf || !nominal_perf) {
655 pr_debug("CPU%d: highest or nominal performance missing\n", cpu);
656 return 0;
657 }
658
659 if (highest_perf < nominal_perf) {
660 pr_debug("CPU%d: nominal performance above highest\n", cpu);
661 return 0;
662 }
663
664 return div_u64(highest_perf << SCHED_CAPACITY_SHIFT, nominal_perf);
665}
666#else
667static inline u64 get_max_boost_ratio(unsigned int cpu) { return 0; }
668#endif
669
670static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
671{
672 struct cpufreq_frequency_table *freq_table;
673 struct acpi_processor_performance *perf;
674 struct acpi_cpufreq_data *data;
675 unsigned int cpu = policy->cpu;
676 struct cpuinfo_x86 *c = &cpu_data(cpu);
677 unsigned int valid_states = 0;
678 unsigned int result = 0;
679 u64 max_boost_ratio;
680 unsigned int i;
681#ifdef CONFIG_SMP
682 static int blacklisted;
683#endif
684
685 pr_debug("%s\n", __func__);
686
687#ifdef CONFIG_SMP
688 if (blacklisted)
689 return blacklisted;
690 blacklisted = acpi_cpufreq_blacklist(c);
691 if (blacklisted)
692 return blacklisted;
693#endif
694
695 data = kzalloc(sizeof(*data), GFP_KERNEL);
696 if (!data)
697 return -ENOMEM;
698
699 if (!zalloc_cpumask_var(&data->freqdomain_cpus, GFP_KERNEL)) {
700 result = -ENOMEM;
701 goto err_free;
702 }
703
704 perf = per_cpu_ptr(acpi_perf_data, cpu);
705 data->acpi_perf_cpu = cpu;
706 policy->driver_data = data;
707
708 if (cpu_has(c, X86_FEATURE_CONSTANT_TSC))
709 acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS;
710
711 result = acpi_processor_register_performance(perf, cpu);
712 if (result)
713 goto err_free_mask;
714
715 policy->shared_type = perf->shared_type;
716
717 /*
718 * Will let policy->cpus know about dependency only when software
719 * coordination is required.
720 */
721 if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL ||
722 policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) {
723 cpumask_copy(policy->cpus, perf->shared_cpu_map);
724 }
725 cpumask_copy(data->freqdomain_cpus, perf->shared_cpu_map);
726
727#ifdef CONFIG_SMP
728 dmi_check_system(sw_any_bug_dmi_table);
729 if (bios_with_sw_any_bug && !policy_is_shared(policy)) {
730 policy->shared_type = CPUFREQ_SHARED_TYPE_ALL;
731 cpumask_copy(policy->cpus, topology_core_cpumask(cpu));
732 }
733
734 if (check_amd_hwpstate_cpu(cpu) && boot_cpu_data.x86 < 0x19 &&
735 !acpi_pstate_strict) {
736 cpumask_clear(policy->cpus);
737 cpumask_set_cpu(cpu, policy->cpus);
738 cpumask_copy(data->freqdomain_cpus,
739 topology_sibling_cpumask(cpu));
740 policy->shared_type = CPUFREQ_SHARED_TYPE_HW;
741 pr_info_once("overriding BIOS provided _PSD data\n");
742 }
743#endif
744
745 /* capability check */
746 if (perf->state_count <= 1) {
747 pr_debug("No P-States\n");
748 result = -ENODEV;
749 goto err_unreg;
750 }
751
752 if (perf->control_register.space_id != perf->status_register.space_id) {
753 result = -ENODEV;
754 goto err_unreg;
755 }
756
757 switch (perf->control_register.space_id) {
758 case ACPI_ADR_SPACE_SYSTEM_IO:
759 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
760 boot_cpu_data.x86 == 0xf) {
761 pr_debug("AMD K8 systems must use native drivers.\n");
762 result = -ENODEV;
763 goto err_unreg;
764 }
765 pr_debug("SYSTEM IO addr space\n");
766 data->cpu_feature = SYSTEM_IO_CAPABLE;
767 data->cpu_freq_read = cpu_freq_read_io;
768 data->cpu_freq_write = cpu_freq_write_io;
769 break;
770 case ACPI_ADR_SPACE_FIXED_HARDWARE:
771 pr_debug("HARDWARE addr space\n");
772 if (check_est_cpu(cpu)) {
773 data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE;
774 data->cpu_freq_read = cpu_freq_read_intel;
775 data->cpu_freq_write = cpu_freq_write_intel;
776 break;
777 }
778 if (check_amd_hwpstate_cpu(cpu)) {
779 data->cpu_feature = SYSTEM_AMD_MSR_CAPABLE;
780 data->cpu_freq_read = cpu_freq_read_amd;
781 data->cpu_freq_write = cpu_freq_write_amd;
782 break;
783 }
784 result = -ENODEV;
785 goto err_unreg;
786 default:
787 pr_debug("Unknown addr space %d\n",
788 (u32) (perf->control_register.space_id));
789 result = -ENODEV;
790 goto err_unreg;
791 }
792
793 freq_table = kcalloc(perf->state_count + 1, sizeof(*freq_table),
794 GFP_KERNEL);
795 if (!freq_table) {
796 result = -ENOMEM;
797 goto err_unreg;
798 }
799
800 /* detect transition latency */
801 policy->cpuinfo.transition_latency = 0;
802 for (i = 0; i < perf->state_count; i++) {
803 if ((perf->states[i].transition_latency * 1000) >
804 policy->cpuinfo.transition_latency)
805 policy->cpuinfo.transition_latency =
806 perf->states[i].transition_latency * 1000;
807 }
808
809 /* Check for high latency (>20uS) from buggy BIOSes, like on T42 */
810 if (perf->control_register.space_id == ACPI_ADR_SPACE_FIXED_HARDWARE &&
811 policy->cpuinfo.transition_latency > 20 * 1000) {
812 policy->cpuinfo.transition_latency = 20 * 1000;
813 pr_info_once("P-state transition latency capped at 20 uS\n");
814 }
815
816 /* table init */
817 for (i = 0; i < perf->state_count; i++) {
818 if (i > 0 && perf->states[i].core_frequency >=
819 freq_table[valid_states-1].frequency / 1000)
820 continue;
821
822 freq_table[valid_states].driver_data = i;
823 freq_table[valid_states].frequency =
824 perf->states[i].core_frequency * 1000;
825 valid_states++;
826 }
827 freq_table[valid_states].frequency = CPUFREQ_TABLE_END;
828
829 max_boost_ratio = get_max_boost_ratio(cpu);
830 if (max_boost_ratio) {
831 unsigned int freq = freq_table[0].frequency;
832
833 /*
834 * Because the loop above sorts the freq_table entries in the
835 * descending order, freq is the maximum frequency in the table.
836 * Assume that it corresponds to the CPPC nominal frequency and
837 * use it to set cpuinfo.max_freq.
838 */
839 policy->cpuinfo.max_freq = freq * max_boost_ratio >> SCHED_CAPACITY_SHIFT;
840 } else {
841 /*
842 * If the maximum "boost" frequency is unknown, ask the arch
843 * scale-invariance code to use the "nominal" performance for
844 * CPU utilization scaling so as to prevent the schedutil
845 * governor from selecting inadequate CPU frequencies.
846 */
847 arch_set_max_freq_ratio(true);
848 }
849
850 policy->freq_table = freq_table;
851 perf->state = 0;
852
853 switch (perf->control_register.space_id) {
854 case ACPI_ADR_SPACE_SYSTEM_IO:
855 /*
856 * The core will not set policy->cur, because
857 * cpufreq_driver->get is NULL, so we need to set it here.
858 * However, we have to guess it, because the current speed is
859 * unknown and not detectable via IO ports.
860 */
861 policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu);
862 break;
863 case ACPI_ADR_SPACE_FIXED_HARDWARE:
864 acpi_cpufreq_driver.get = get_cur_freq_on_cpu;
865 break;
866 default:
867 break;
868 }
869
870 /* notify BIOS that we exist */
871 acpi_processor_notify_smm(THIS_MODULE);
872
873 pr_debug("CPU%u - ACPI performance management activated.\n", cpu);
874 for (i = 0; i < perf->state_count; i++)
875 pr_debug(" %cP%d: %d MHz, %d mW, %d uS\n",
876 (i == perf->state ? '*' : ' '), i,
877 (u32) perf->states[i].core_frequency,
878 (u32) perf->states[i].power,
879 (u32) perf->states[i].transition_latency);
880
881 /*
882 * the first call to ->target() should result in us actually
883 * writing something to the appropriate registers.
884 */
885 data->resume = 1;
886
887 policy->fast_switch_possible = !acpi_pstate_strict &&
888 !(policy_is_shared(policy) && policy->shared_type != CPUFREQ_SHARED_TYPE_ANY);
889
890 if (perf->states[0].core_frequency * 1000 != freq_table[0].frequency)
891 pr_warn(FW_WARN "P-state 0 is not max freq\n");
892
893 if (acpi_cpufreq_driver.set_boost)
894 set_boost(policy, acpi_cpufreq_driver.boost_enabled);
895
896 return result;
897
898err_unreg:
899 acpi_processor_unregister_performance(cpu);
900err_free_mask:
901 free_cpumask_var(data->freqdomain_cpus);
902err_free:
903 kfree(data);
904 policy->driver_data = NULL;
905
906 return result;
907}
908
909static 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 cpufreq_boost_down_prep(policy->cpu);
916 policy->fast_switch_possible = false;
917 policy->driver_data = NULL;
918 acpi_processor_unregister_performance(data->acpi_perf_cpu);
919 free_cpumask_var(data->freqdomain_cpus);
920 kfree(policy->freq_table);
921 kfree(data);
922
923 return 0;
924}
925
926static int acpi_cpufreq_resume(struct cpufreq_policy *policy)
927{
928 struct acpi_cpufreq_data *data = policy->driver_data;
929
930 pr_debug("%s\n", __func__);
931
932 data->resume = 1;
933
934 return 0;
935}
936
937static struct freq_attr *acpi_cpufreq_attr[] = {
938 &cpufreq_freq_attr_scaling_available_freqs,
939 &freqdomain_cpus,
940#ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
941 &cpb,
942#endif
943 NULL,
944};
945
946static struct cpufreq_driver acpi_cpufreq_driver = {
947 .verify = cpufreq_generic_frequency_table_verify,
948 .target_index = acpi_cpufreq_target,
949 .fast_switch = acpi_cpufreq_fast_switch,
950 .bios_limit = acpi_processor_get_bios_limit,
951 .init = acpi_cpufreq_cpu_init,
952 .exit = acpi_cpufreq_cpu_exit,
953 .resume = acpi_cpufreq_resume,
954 .name = "acpi-cpufreq",
955 .attr = acpi_cpufreq_attr,
956};
957
958static void __init acpi_cpufreq_boost_init(void)
959{
960 if (!(boot_cpu_has(X86_FEATURE_CPB) || boot_cpu_has(X86_FEATURE_IDA))) {
961 pr_debug("Boost capabilities not present in the processor\n");
962 return;
963 }
964
965 acpi_cpufreq_driver.set_boost = set_boost;
966 acpi_cpufreq_driver.boost_enabled = boost_state(0);
967}
968
969static int __init acpi_cpufreq_probe(struct platform_device *pdev)
970{
971 int ret;
972
973 if (acpi_disabled)
974 return -ENODEV;
975
976 /* don't keep reloading if cpufreq_driver exists */
977 if (cpufreq_get_current_driver())
978 return -ENODEV;
979
980 pr_debug("%s\n", __func__);
981
982 ret = acpi_cpufreq_early_init();
983 if (ret)
984 return ret;
985
986#ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
987 /* this is a sysfs file with a strange name and an even stranger
988 * semantic - per CPU instantiation, but system global effect.
989 * Lets enable it only on AMD CPUs for compatibility reasons and
990 * only if configured. This is considered legacy code, which
991 * will probably be removed at some point in the future.
992 */
993 if (!check_amd_hwpstate_cpu(0)) {
994 struct freq_attr **attr;
995
996 pr_debug("CPB unsupported, do not expose it\n");
997
998 for (attr = acpi_cpufreq_attr; *attr; attr++)
999 if (*attr == &cpb) {
1000 *attr = NULL;
1001 break;
1002 }
1003 }
1004#endif
1005 acpi_cpufreq_boost_init();
1006
1007 ret = cpufreq_register_driver(&acpi_cpufreq_driver);
1008 if (ret) {
1009 free_acpi_perf_data();
1010 }
1011 return ret;
1012}
1013
1014static void acpi_cpufreq_remove(struct platform_device *pdev)
1015{
1016 pr_debug("%s\n", __func__);
1017
1018 cpufreq_unregister_driver(&acpi_cpufreq_driver);
1019
1020 free_acpi_perf_data();
1021}
1022
1023static struct platform_driver acpi_cpufreq_platdrv = {
1024 .driver = {
1025 .name = "acpi-cpufreq",
1026 },
1027 .remove_new = acpi_cpufreq_remove,
1028};
1029
1030static int __init acpi_cpufreq_init(void)
1031{
1032 return platform_driver_probe(&acpi_cpufreq_platdrv, acpi_cpufreq_probe);
1033}
1034
1035static void __exit acpi_cpufreq_exit(void)
1036{
1037 platform_driver_unregister(&acpi_cpufreq_platdrv);
1038}
1039
1040module_param(acpi_pstate_strict, uint, 0644);
1041MODULE_PARM_DESC(acpi_pstate_strict,
1042 "value 0 or non-zero. non-zero -> strict ACPI checks are "
1043 "performed during frequency changes.");
1044
1045late_initcall(acpi_cpufreq_init);
1046module_exit(acpi_cpufreq_exit);
1047
1048MODULE_ALIAS("platform:acpi-cpufreq");
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#include <linux/string_helpers.h>
23
24#include <linux/acpi.h>
25#include <linux/io.h>
26#include <linux/delay.h>
27#include <linux/uaccess.h>
28
29#include <acpi/processor.h>
30#include <acpi/cppc_acpi.h>
31
32#include <asm/msr.h>
33#include <asm/processor.h>
34#include <asm/cpufeature.h>
35#include <asm/cpu_device_id.h>
36
37MODULE_AUTHOR("Paul Diefenbaugh, Dominik Brodowski");
38MODULE_DESCRIPTION("ACPI Processor P-States Driver");
39MODULE_LICENSE("GPL");
40
41enum {
42 UNDEFINED_CAPABLE = 0,
43 SYSTEM_INTEL_MSR_CAPABLE,
44 SYSTEM_AMD_MSR_CAPABLE,
45 SYSTEM_IO_CAPABLE,
46};
47
48#define INTEL_MSR_RANGE (0xffff)
49#define AMD_MSR_RANGE (0x7)
50#define HYGON_MSR_RANGE (0x7)
51
52#define MSR_K7_HWCR_CPB_DIS (1ULL << 25)
53
54struct acpi_cpufreq_data {
55 unsigned int resume;
56 unsigned int cpu_feature;
57 unsigned int acpi_perf_cpu;
58 cpumask_var_t freqdomain_cpus;
59 void (*cpu_freq_write)(struct acpi_pct_register *reg, u32 val);
60 u32 (*cpu_freq_read)(struct acpi_pct_register *reg);
61};
62
63/* acpi_perf_data is a pointer to percpu data. */
64static struct acpi_processor_performance __percpu *acpi_perf_data;
65
66static inline struct acpi_processor_performance *to_perf_data(struct acpi_cpufreq_data *data)
67{
68 return per_cpu_ptr(acpi_perf_data, data->acpi_perf_cpu);
69}
70
71static struct cpufreq_driver acpi_cpufreq_driver;
72
73static unsigned int acpi_pstate_strict;
74
75static bool boost_state(unsigned int cpu)
76{
77 u32 lo, hi;
78 u64 msr;
79
80 switch (boot_cpu_data.x86_vendor) {
81 case X86_VENDOR_INTEL:
82 case X86_VENDOR_CENTAUR:
83 case X86_VENDOR_ZHAOXIN:
84 rdmsr_on_cpu(cpu, MSR_IA32_MISC_ENABLE, &lo, &hi);
85 msr = lo | ((u64)hi << 32);
86 return !(msr & MSR_IA32_MISC_ENABLE_TURBO_DISABLE);
87 case X86_VENDOR_HYGON:
88 case X86_VENDOR_AMD:
89 rdmsr_on_cpu(cpu, MSR_K7_HWCR, &lo, &hi);
90 msr = lo | ((u64)hi << 32);
91 return !(msr & MSR_K7_HWCR_CPB_DIS);
92 }
93 return false;
94}
95
96static int boost_set_msr(bool enable)
97{
98 u32 msr_addr;
99 u64 msr_mask, val;
100
101 switch (boot_cpu_data.x86_vendor) {
102 case X86_VENDOR_INTEL:
103 case X86_VENDOR_CENTAUR:
104 case X86_VENDOR_ZHAOXIN:
105 msr_addr = MSR_IA32_MISC_ENABLE;
106 msr_mask = MSR_IA32_MISC_ENABLE_TURBO_DISABLE;
107 break;
108 case X86_VENDOR_HYGON:
109 case X86_VENDOR_AMD:
110 msr_addr = MSR_K7_HWCR;
111 msr_mask = MSR_K7_HWCR_CPB_DIS;
112 break;
113 default:
114 return -EINVAL;
115 }
116
117 rdmsrl(msr_addr, val);
118
119 if (enable)
120 val &= ~msr_mask;
121 else
122 val |= msr_mask;
123
124 wrmsrl(msr_addr, val);
125 return 0;
126}
127
128static void boost_set_msr_each(void *p_en)
129{
130 bool enable = (bool) p_en;
131
132 boost_set_msr(enable);
133}
134
135static int set_boost(struct cpufreq_policy *policy, int val)
136{
137 on_each_cpu_mask(policy->cpus, boost_set_msr_each,
138 (void *)(long)val, 1);
139 pr_debug("CPU %*pbl: Core Boosting %s.\n",
140 cpumask_pr_args(policy->cpus), str_enabled_disabled(val));
141
142 return 0;
143}
144
145static ssize_t show_freqdomain_cpus(struct cpufreq_policy *policy, char *buf)
146{
147 struct acpi_cpufreq_data *data = policy->driver_data;
148
149 if (unlikely(!data))
150 return -ENODEV;
151
152 return cpufreq_show_cpus(data->freqdomain_cpus, buf);
153}
154
155cpufreq_freq_attr_ro(freqdomain_cpus);
156
157#ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
158static ssize_t store_cpb(struct cpufreq_policy *policy, const char *buf,
159 size_t count)
160{
161 int ret;
162 unsigned int val = 0;
163
164 if (!acpi_cpufreq_driver.set_boost)
165 return -EINVAL;
166
167 ret = kstrtouint(buf, 10, &val);
168 if (ret || val > 1)
169 return -EINVAL;
170
171 cpus_read_lock();
172 set_boost(policy, val);
173 cpus_read_unlock();
174
175 return count;
176}
177
178static ssize_t show_cpb(struct cpufreq_policy *policy, char *buf)
179{
180 return sprintf(buf, "%u\n", acpi_cpufreq_driver.boost_enabled);
181}
182
183cpufreq_freq_attr_rw(cpb);
184#endif
185
186static int check_est_cpu(unsigned int cpuid)
187{
188 struct cpuinfo_x86 *cpu = &cpu_data(cpuid);
189
190 return cpu_has(cpu, X86_FEATURE_EST);
191}
192
193static int check_amd_hwpstate_cpu(unsigned int cpuid)
194{
195 struct cpuinfo_x86 *cpu = &cpu_data(cpuid);
196
197 return cpu_has(cpu, X86_FEATURE_HW_PSTATE);
198}
199
200static unsigned extract_io(struct cpufreq_policy *policy, u32 value)
201{
202 struct acpi_cpufreq_data *data = policy->driver_data;
203 struct acpi_processor_performance *perf;
204 int i;
205
206 perf = to_perf_data(data);
207
208 for (i = 0; i < perf->state_count; i++) {
209 if (value == perf->states[i].status)
210 return policy->freq_table[i].frequency;
211 }
212 return 0;
213}
214
215static unsigned extract_msr(struct cpufreq_policy *policy, u32 msr)
216{
217 struct acpi_cpufreq_data *data = policy->driver_data;
218 struct cpufreq_frequency_table *pos;
219 struct acpi_processor_performance *perf;
220
221 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
222 msr &= AMD_MSR_RANGE;
223 else if (boot_cpu_data.x86_vendor == X86_VENDOR_HYGON)
224 msr &= HYGON_MSR_RANGE;
225 else
226 msr &= INTEL_MSR_RANGE;
227
228 perf = to_perf_data(data);
229
230 cpufreq_for_each_entry(pos, policy->freq_table)
231 if (msr == perf->states[pos->driver_data].status)
232 return pos->frequency;
233 return policy->freq_table[0].frequency;
234}
235
236static unsigned extract_freq(struct cpufreq_policy *policy, u32 val)
237{
238 struct acpi_cpufreq_data *data = policy->driver_data;
239
240 switch (data->cpu_feature) {
241 case SYSTEM_INTEL_MSR_CAPABLE:
242 case SYSTEM_AMD_MSR_CAPABLE:
243 return extract_msr(policy, val);
244 case SYSTEM_IO_CAPABLE:
245 return extract_io(policy, val);
246 default:
247 return 0;
248 }
249}
250
251static u32 cpu_freq_read_intel(struct acpi_pct_register *not_used)
252{
253 u32 val, dummy __always_unused;
254
255 rdmsr(MSR_IA32_PERF_CTL, val, dummy);
256 return val;
257}
258
259static void cpu_freq_write_intel(struct acpi_pct_register *not_used, u32 val)
260{
261 u32 lo, hi;
262
263 rdmsr(MSR_IA32_PERF_CTL, lo, hi);
264 lo = (lo & ~INTEL_MSR_RANGE) | (val & INTEL_MSR_RANGE);
265 wrmsr(MSR_IA32_PERF_CTL, lo, hi);
266}
267
268static u32 cpu_freq_read_amd(struct acpi_pct_register *not_used)
269{
270 u32 val, dummy __always_unused;
271
272 rdmsr(MSR_AMD_PERF_CTL, val, dummy);
273 return val;
274}
275
276static void cpu_freq_write_amd(struct acpi_pct_register *not_used, u32 val)
277{
278 wrmsr(MSR_AMD_PERF_CTL, val, 0);
279}
280
281static u32 cpu_freq_read_io(struct acpi_pct_register *reg)
282{
283 u32 val;
284
285 acpi_os_read_port(reg->address, &val, reg->bit_width);
286 return val;
287}
288
289static void cpu_freq_write_io(struct acpi_pct_register *reg, u32 val)
290{
291 acpi_os_write_port(reg->address, val, reg->bit_width);
292}
293
294struct drv_cmd {
295 struct acpi_pct_register *reg;
296 u32 val;
297 union {
298 void (*write)(struct acpi_pct_register *reg, u32 val);
299 u32 (*read)(struct acpi_pct_register *reg);
300 } func;
301};
302
303/* Called via smp_call_function_single(), on the target CPU */
304static void do_drv_read(void *_cmd)
305{
306 struct drv_cmd *cmd = _cmd;
307
308 cmd->val = cmd->func.read(cmd->reg);
309}
310
311static u32 drv_read(struct acpi_cpufreq_data *data, const struct cpumask *mask)
312{
313 struct acpi_processor_performance *perf = to_perf_data(data);
314 struct drv_cmd cmd = {
315 .reg = &perf->control_register,
316 .func.read = data->cpu_freq_read,
317 };
318 int err;
319
320 err = smp_call_function_any(mask, do_drv_read, &cmd, 1);
321 WARN_ON_ONCE(err); /* smp_call_function_any() was buggy? */
322 return cmd.val;
323}
324
325/* Called via smp_call_function_many(), on the target CPUs */
326static void do_drv_write(void *_cmd)
327{
328 struct drv_cmd *cmd = _cmd;
329
330 cmd->func.write(cmd->reg, cmd->val);
331}
332
333static void drv_write(struct acpi_cpufreq_data *data,
334 const struct cpumask *mask, u32 val)
335{
336 struct acpi_processor_performance *perf = to_perf_data(data);
337 struct drv_cmd cmd = {
338 .reg = &perf->control_register,
339 .val = val,
340 .func.write = data->cpu_freq_write,
341 };
342 int this_cpu;
343
344 this_cpu = get_cpu();
345 if (cpumask_test_cpu(this_cpu, mask))
346 do_drv_write(&cmd);
347
348 smp_call_function_many(mask, do_drv_write, &cmd, 1);
349 put_cpu();
350}
351
352static u32 get_cur_val(const struct cpumask *mask, struct acpi_cpufreq_data *data)
353{
354 u32 val;
355
356 if (unlikely(cpumask_empty(mask)))
357 return 0;
358
359 val = drv_read(data, mask);
360
361 pr_debug("%s = %u\n", __func__, val);
362
363 return val;
364}
365
366static unsigned int get_cur_freq_on_cpu(unsigned int cpu)
367{
368 struct acpi_cpufreq_data *data;
369 struct cpufreq_policy *policy;
370 unsigned int freq;
371 unsigned int cached_freq;
372
373 pr_debug("%s (%d)\n", __func__, cpu);
374
375 policy = cpufreq_cpu_get_raw(cpu);
376 if (unlikely(!policy))
377 return 0;
378
379 data = policy->driver_data;
380 if (unlikely(!data || !policy->freq_table))
381 return 0;
382
383 cached_freq = policy->freq_table[to_perf_data(data)->state].frequency;
384 freq = extract_freq(policy, get_cur_val(cpumask_of(cpu), data));
385 if (freq != cached_freq) {
386 /*
387 * The dreaded BIOS frequency change behind our back.
388 * Force set the frequency on next target call.
389 */
390 data->resume = 1;
391 }
392
393 pr_debug("cur freq = %u\n", freq);
394
395 return freq;
396}
397
398static unsigned int check_freqs(struct cpufreq_policy *policy,
399 const struct cpumask *mask, unsigned int freq)
400{
401 struct acpi_cpufreq_data *data = policy->driver_data;
402 unsigned int cur_freq;
403 unsigned int i;
404
405 for (i = 0; i < 100; i++) {
406 cur_freq = extract_freq(policy, get_cur_val(mask, data));
407 if (cur_freq == freq)
408 return 1;
409 udelay(10);
410 }
411 return 0;
412}
413
414static int acpi_cpufreq_target(struct cpufreq_policy *policy,
415 unsigned int index)
416{
417 struct acpi_cpufreq_data *data = policy->driver_data;
418 struct acpi_processor_performance *perf;
419 const struct cpumask *mask;
420 unsigned int next_perf_state = 0; /* Index into perf table */
421 int result = 0;
422
423 if (unlikely(!data)) {
424 return -ENODEV;
425 }
426
427 perf = to_perf_data(data);
428 next_perf_state = policy->freq_table[index].driver_data;
429 if (perf->state == next_perf_state) {
430 if (unlikely(data->resume)) {
431 pr_debug("Called after resume, resetting to P%d\n",
432 next_perf_state);
433 data->resume = 0;
434 } else {
435 pr_debug("Already at target state (P%d)\n",
436 next_perf_state);
437 return 0;
438 }
439 }
440
441 /*
442 * The core won't allow CPUs to go away until the governor has been
443 * stopped, so we can rely on the stability of policy->cpus.
444 */
445 mask = policy->shared_type == CPUFREQ_SHARED_TYPE_ANY ?
446 cpumask_of(policy->cpu) : policy->cpus;
447
448 drv_write(data, mask, perf->states[next_perf_state].control);
449
450 if (acpi_pstate_strict) {
451 if (!check_freqs(policy, mask,
452 policy->freq_table[index].frequency)) {
453 pr_debug("%s (%d)\n", __func__, policy->cpu);
454 result = -EAGAIN;
455 }
456 }
457
458 if (!result)
459 perf->state = next_perf_state;
460
461 return result;
462}
463
464static unsigned int acpi_cpufreq_fast_switch(struct cpufreq_policy *policy,
465 unsigned int target_freq)
466{
467 struct acpi_cpufreq_data *data = policy->driver_data;
468 struct acpi_processor_performance *perf;
469 struct cpufreq_frequency_table *entry;
470 unsigned int next_perf_state, next_freq, index;
471
472 /*
473 * Find the closest frequency above target_freq.
474 */
475 if (policy->cached_target_freq == target_freq)
476 index = policy->cached_resolved_idx;
477 else
478 index = cpufreq_table_find_index_dl(policy, target_freq,
479 false);
480
481 entry = &policy->freq_table[index];
482 next_freq = entry->frequency;
483 next_perf_state = entry->driver_data;
484
485 perf = to_perf_data(data);
486 if (perf->state == next_perf_state) {
487 if (unlikely(data->resume))
488 data->resume = 0;
489 else
490 return next_freq;
491 }
492
493 data->cpu_freq_write(&perf->control_register,
494 perf->states[next_perf_state].control);
495 perf->state = next_perf_state;
496 return next_freq;
497}
498
499static unsigned long
500acpi_cpufreq_guess_freq(struct acpi_cpufreq_data *data, unsigned int cpu)
501{
502 struct acpi_processor_performance *perf;
503
504 perf = to_perf_data(data);
505 if (cpu_khz) {
506 /* search the closest match to cpu_khz */
507 unsigned int i;
508 unsigned long freq;
509 unsigned long freqn = perf->states[0].core_frequency * 1000;
510
511 for (i = 0; i < (perf->state_count-1); i++) {
512 freq = freqn;
513 freqn = perf->states[i+1].core_frequency * 1000;
514 if ((2 * cpu_khz) > (freqn + freq)) {
515 perf->state = i;
516 return freq;
517 }
518 }
519 perf->state = perf->state_count-1;
520 return freqn;
521 } else {
522 /* assume CPU is at P0... */
523 perf->state = 0;
524 return perf->states[0].core_frequency * 1000;
525 }
526}
527
528static void free_acpi_perf_data(void)
529{
530 unsigned int i;
531
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)
535 ->shared_cpu_map);
536 free_percpu(acpi_perf_data);
537}
538
539static int cpufreq_boost_down_prep(unsigned int cpu)
540{
541 /*
542 * Clear the boost-disable bit on the CPU_DOWN path so that
543 * this cpu cannot block the remaining ones from boosting.
544 */
545 return boost_set_msr(1);
546}
547
548/*
549 * acpi_cpufreq_early_init - initialize ACPI P-States library
550 *
551 * Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c)
552 * in order to determine correct frequency and voltage pairings. We can
553 * do _PDC and _PSD and find out the processor dependency for the
554 * actual init that will happen later...
555 */
556static int __init acpi_cpufreq_early_init(void)
557{
558 unsigned int i;
559 pr_debug("%s\n", __func__);
560
561 acpi_perf_data = alloc_percpu(struct acpi_processor_performance);
562 if (!acpi_perf_data) {
563 pr_debug("Memory allocation error for acpi_perf_data.\n");
564 return -ENOMEM;
565 }
566 for_each_possible_cpu(i) {
567 if (!zalloc_cpumask_var_node(
568 &per_cpu_ptr(acpi_perf_data, i)->shared_cpu_map,
569 GFP_KERNEL, cpu_to_node(i))) {
570
571 /* Freeing a NULL pointer is OK: alloc_percpu zeroes. */
572 free_acpi_perf_data();
573 return -ENOMEM;
574 }
575 }
576
577 /* Do initialization in ACPI core */
578 acpi_processor_preregister_performance(acpi_perf_data);
579 return 0;
580}
581
582#ifdef CONFIG_SMP
583/*
584 * Some BIOSes do SW_ANY coordination internally, either set it up in hw
585 * or do it in BIOS firmware and won't inform about it to OS. If not
586 * detected, this has a side effect of making CPU run at a different speed
587 * than OS intended it to run at. Detect it and handle it cleanly.
588 */
589static int bios_with_sw_any_bug;
590
591static int sw_any_bug_found(const struct dmi_system_id *d)
592{
593 bios_with_sw_any_bug = 1;
594 return 0;
595}
596
597static const struct dmi_system_id sw_any_bug_dmi_table[] = {
598 {
599 .callback = sw_any_bug_found,
600 .ident = "Supermicro Server X6DLP",
601 .matches = {
602 DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
603 DMI_MATCH(DMI_BIOS_VERSION, "080010"),
604 DMI_MATCH(DMI_PRODUCT_NAME, "X6DLP"),
605 },
606 },
607 { }
608};
609
610static int acpi_cpufreq_blacklist(struct cpuinfo_x86 *c)
611{
612 /* Intel Xeon Processor 7100 Series Specification Update
613 * https://www.intel.com/Assets/PDF/specupdate/314554.pdf
614 * AL30: A Machine Check Exception (MCE) Occurring during an
615 * Enhanced Intel SpeedStep Technology Ratio Change May Cause
616 * Both Processor Cores to Lock Up. */
617 if (c->x86_vendor == X86_VENDOR_INTEL) {
618 if ((c->x86 == 15) &&
619 (c->x86_model == 6) &&
620 (c->x86_stepping == 8)) {
621 pr_info("Intel(R) Xeon(R) 7100 Errata AL30, processors may lock up on frequency changes: disabling acpi-cpufreq\n");
622 return -ENODEV;
623 }
624 }
625 return 0;
626}
627#endif
628
629#ifdef CONFIG_ACPI_CPPC_LIB
630static u64 get_max_boost_ratio(unsigned int cpu)
631{
632 struct cppc_perf_caps perf_caps;
633 u64 highest_perf, nominal_perf;
634 int ret;
635
636 if (acpi_pstate_strict)
637 return 0;
638
639 ret = cppc_get_perf_caps(cpu, &perf_caps);
640 if (ret) {
641 pr_debug("CPU%d: Unable to get performance capabilities (%d)\n",
642 cpu, ret);
643 return 0;
644 }
645
646 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
647 highest_perf = amd_get_highest_perf();
648 else
649 highest_perf = perf_caps.highest_perf;
650
651 nominal_perf = perf_caps.nominal_perf;
652
653 if (!highest_perf || !nominal_perf) {
654 pr_debug("CPU%d: highest or nominal performance missing\n", cpu);
655 return 0;
656 }
657
658 if (highest_perf < nominal_perf) {
659 pr_debug("CPU%d: nominal performance above highest\n", cpu);
660 return 0;
661 }
662
663 return div_u64(highest_perf << SCHED_CAPACITY_SHIFT, nominal_perf);
664}
665#else
666static inline u64 get_max_boost_ratio(unsigned int cpu) { return 0; }
667#endif
668
669static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
670{
671 struct cpufreq_frequency_table *freq_table;
672 struct acpi_processor_performance *perf;
673 struct acpi_cpufreq_data *data;
674 unsigned int cpu = policy->cpu;
675 struct cpuinfo_x86 *c = &cpu_data(cpu);
676 unsigned int valid_states = 0;
677 unsigned int result = 0;
678 u64 max_boost_ratio;
679 unsigned int i;
680#ifdef CONFIG_SMP
681 static int blacklisted;
682#endif
683
684 pr_debug("%s\n", __func__);
685
686#ifdef CONFIG_SMP
687 if (blacklisted)
688 return blacklisted;
689 blacklisted = acpi_cpufreq_blacklist(c);
690 if (blacklisted)
691 return blacklisted;
692#endif
693
694 data = kzalloc(sizeof(*data), GFP_KERNEL);
695 if (!data)
696 return -ENOMEM;
697
698 if (!zalloc_cpumask_var(&data->freqdomain_cpus, GFP_KERNEL)) {
699 result = -ENOMEM;
700 goto err_free;
701 }
702
703 perf = per_cpu_ptr(acpi_perf_data, cpu);
704 data->acpi_perf_cpu = cpu;
705 policy->driver_data = data;
706
707 if (cpu_has(c, X86_FEATURE_CONSTANT_TSC))
708 acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS;
709
710 result = acpi_processor_register_performance(perf, cpu);
711 if (result)
712 goto err_free_mask;
713
714 policy->shared_type = perf->shared_type;
715
716 /*
717 * Will let policy->cpus know about dependency only when software
718 * coordination is required.
719 */
720 if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL ||
721 policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) {
722 cpumask_copy(policy->cpus, perf->shared_cpu_map);
723 }
724 cpumask_copy(data->freqdomain_cpus, perf->shared_cpu_map);
725
726#ifdef CONFIG_SMP
727 dmi_check_system(sw_any_bug_dmi_table);
728 if (bios_with_sw_any_bug && !policy_is_shared(policy)) {
729 policy->shared_type = CPUFREQ_SHARED_TYPE_ALL;
730 cpumask_copy(policy->cpus, topology_core_cpumask(cpu));
731 }
732
733 if (check_amd_hwpstate_cpu(cpu) && boot_cpu_data.x86 < 0x19 &&
734 !acpi_pstate_strict) {
735 cpumask_clear(policy->cpus);
736 cpumask_set_cpu(cpu, policy->cpus);
737 cpumask_copy(data->freqdomain_cpus,
738 topology_sibling_cpumask(cpu));
739 policy->shared_type = CPUFREQ_SHARED_TYPE_HW;
740 pr_info_once("overriding BIOS provided _PSD data\n");
741 }
742#endif
743
744 /* capability check */
745 if (perf->state_count <= 1) {
746 pr_debug("No P-States\n");
747 result = -ENODEV;
748 goto err_unreg;
749 }
750
751 if (perf->control_register.space_id != perf->status_register.space_id) {
752 result = -ENODEV;
753 goto err_unreg;
754 }
755
756 switch (perf->control_register.space_id) {
757 case ACPI_ADR_SPACE_SYSTEM_IO:
758 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
759 boot_cpu_data.x86 == 0xf) {
760 pr_debug("AMD K8 systems must use native drivers.\n");
761 result = -ENODEV;
762 goto err_unreg;
763 }
764 pr_debug("SYSTEM IO addr space\n");
765 data->cpu_feature = SYSTEM_IO_CAPABLE;
766 data->cpu_freq_read = cpu_freq_read_io;
767 data->cpu_freq_write = cpu_freq_write_io;
768 break;
769 case ACPI_ADR_SPACE_FIXED_HARDWARE:
770 pr_debug("HARDWARE addr space\n");
771 if (check_est_cpu(cpu)) {
772 data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE;
773 data->cpu_freq_read = cpu_freq_read_intel;
774 data->cpu_freq_write = cpu_freq_write_intel;
775 break;
776 }
777 if (check_amd_hwpstate_cpu(cpu)) {
778 data->cpu_feature = SYSTEM_AMD_MSR_CAPABLE;
779 data->cpu_freq_read = cpu_freq_read_amd;
780 data->cpu_freq_write = cpu_freq_write_amd;
781 break;
782 }
783 result = -ENODEV;
784 goto err_unreg;
785 default:
786 pr_debug("Unknown addr space %d\n",
787 (u32) (perf->control_register.space_id));
788 result = -ENODEV;
789 goto err_unreg;
790 }
791
792 freq_table = kcalloc(perf->state_count + 1, sizeof(*freq_table),
793 GFP_KERNEL);
794 if (!freq_table) {
795 result = -ENOMEM;
796 goto err_unreg;
797 }
798
799 /* detect transition latency */
800 policy->cpuinfo.transition_latency = 0;
801 for (i = 0; i < perf->state_count; i++) {
802 if ((perf->states[i].transition_latency * 1000) >
803 policy->cpuinfo.transition_latency)
804 policy->cpuinfo.transition_latency =
805 perf->states[i].transition_latency * 1000;
806 }
807
808 /* Check for high latency (>20uS) from buggy BIOSes, like on T42 */
809 if (perf->control_register.space_id == ACPI_ADR_SPACE_FIXED_HARDWARE &&
810 policy->cpuinfo.transition_latency > 20 * 1000) {
811 policy->cpuinfo.transition_latency = 20 * 1000;
812 pr_info_once("P-state transition latency capped at 20 uS\n");
813 }
814
815 /* table init */
816 for (i = 0; i < perf->state_count; i++) {
817 if (i > 0 && perf->states[i].core_frequency >=
818 freq_table[valid_states-1].frequency / 1000)
819 continue;
820
821 freq_table[valid_states].driver_data = i;
822 freq_table[valid_states].frequency =
823 perf->states[i].core_frequency * 1000;
824 valid_states++;
825 }
826 freq_table[valid_states].frequency = CPUFREQ_TABLE_END;
827
828 max_boost_ratio = get_max_boost_ratio(cpu);
829 if (max_boost_ratio) {
830 unsigned int freq = freq_table[0].frequency;
831
832 /*
833 * Because the loop above sorts the freq_table entries in the
834 * descending order, freq is the maximum frequency in the table.
835 * Assume that it corresponds to the CPPC nominal frequency and
836 * use it to set cpuinfo.max_freq.
837 */
838 policy->cpuinfo.max_freq = freq * max_boost_ratio >> SCHED_CAPACITY_SHIFT;
839 } else {
840 /*
841 * If the maximum "boost" frequency is unknown, ask the arch
842 * scale-invariance code to use the "nominal" performance for
843 * CPU utilization scaling so as to prevent the schedutil
844 * governor from selecting inadequate CPU frequencies.
845 */
846 arch_set_max_freq_ratio(true);
847 }
848
849 policy->freq_table = freq_table;
850 perf->state = 0;
851
852 switch (perf->control_register.space_id) {
853 case ACPI_ADR_SPACE_SYSTEM_IO:
854 /*
855 * The core will not set policy->cur, because
856 * cpufreq_driver->get is NULL, so we need to set it here.
857 * However, we have to guess it, because the current speed is
858 * unknown and not detectable via IO ports.
859 */
860 policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu);
861 break;
862 case ACPI_ADR_SPACE_FIXED_HARDWARE:
863 acpi_cpufreq_driver.get = get_cur_freq_on_cpu;
864 break;
865 default:
866 break;
867 }
868
869 /* notify BIOS that we exist */
870 acpi_processor_notify_smm(THIS_MODULE);
871
872 pr_debug("CPU%u - ACPI performance management activated.\n", cpu);
873 for (i = 0; i < perf->state_count; i++)
874 pr_debug(" %cP%d: %d MHz, %d mW, %d uS\n",
875 (i == perf->state ? '*' : ' '), i,
876 (u32) perf->states[i].core_frequency,
877 (u32) perf->states[i].power,
878 (u32) perf->states[i].transition_latency);
879
880 /*
881 * the first call to ->target() should result in us actually
882 * writing something to the appropriate registers.
883 */
884 data->resume = 1;
885
886 policy->fast_switch_possible = !acpi_pstate_strict &&
887 !(policy_is_shared(policy) && policy->shared_type != CPUFREQ_SHARED_TYPE_ANY);
888
889 if (perf->states[0].core_frequency * 1000 != freq_table[0].frequency)
890 pr_warn(FW_WARN "P-state 0 is not max freq\n");
891
892 if (acpi_cpufreq_driver.set_boost)
893 set_boost(policy, acpi_cpufreq_driver.boost_enabled);
894
895 return result;
896
897err_unreg:
898 acpi_processor_unregister_performance(cpu);
899err_free_mask:
900 free_cpumask_var(data->freqdomain_cpus);
901err_free:
902 kfree(data);
903 policy->driver_data = NULL;
904
905 return result;
906}
907
908static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy)
909{
910 struct acpi_cpufreq_data *data = policy->driver_data;
911
912 pr_debug("%s\n", __func__);
913
914 cpufreq_boost_down_prep(policy->cpu);
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
925static 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
936static 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
945static 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
957static void __init acpi_cpufreq_boost_init(void)
958{
959 if (!(boot_cpu_has(X86_FEATURE_CPB) || boot_cpu_has(X86_FEATURE_IDA))) {
960 pr_debug("Boost capabilities not present in the processor\n");
961 return;
962 }
963
964 acpi_cpufreq_driver.set_boost = set_boost;
965 acpi_cpufreq_driver.boost_enabled = boost_state(0);
966}
967
968static int __init acpi_cpufreq_init(void)
969{
970 int ret;
971
972 if (acpi_disabled)
973 return -ENODEV;
974
975 /* don't keep reloading if cpufreq_driver exists */
976 if (cpufreq_get_current_driver())
977 return -EEXIST;
978
979 pr_debug("%s\n", __func__);
980
981 ret = acpi_cpufreq_early_init();
982 if (ret)
983 return ret;
984
985#ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
986 /* this is a sysfs file with a strange name and an even stranger
987 * semantic - per CPU instantiation, but system global effect.
988 * Lets enable it only on AMD CPUs for compatibility reasons and
989 * only if configured. This is considered legacy code, which
990 * will probably be removed at some point in the future.
991 */
992 if (!check_amd_hwpstate_cpu(0)) {
993 struct freq_attr **attr;
994
995 pr_debug("CPB unsupported, do not expose it\n");
996
997 for (attr = acpi_cpufreq_attr; *attr; attr++)
998 if (*attr == &cpb) {
999 *attr = NULL;
1000 break;
1001 }
1002 }
1003#endif
1004 acpi_cpufreq_boost_init();
1005
1006 ret = cpufreq_register_driver(&acpi_cpufreq_driver);
1007 if (ret) {
1008 free_acpi_perf_data();
1009 }
1010 return ret;
1011}
1012
1013static void __exit acpi_cpufreq_exit(void)
1014{
1015 pr_debug("%s\n", __func__);
1016
1017 cpufreq_unregister_driver(&acpi_cpufreq_driver);
1018
1019 free_acpi_perf_data();
1020}
1021
1022module_param(acpi_pstate_strict, uint, 0644);
1023MODULE_PARM_DESC(acpi_pstate_strict,
1024 "value 0 or non-zero. non-zero -> strict ACPI checks are "
1025 "performed during frequency changes.");
1026
1027late_initcall(acpi_cpufreq_init);
1028module_exit(acpi_cpufreq_exit);
1029
1030static const struct x86_cpu_id __maybe_unused acpi_cpufreq_ids[] = {
1031 X86_MATCH_FEATURE(X86_FEATURE_ACPI, NULL),
1032 X86_MATCH_FEATURE(X86_FEATURE_HW_PSTATE, NULL),
1033 {}
1034};
1035MODULE_DEVICE_TABLE(x86cpu, acpi_cpufreq_ids);
1036
1037static const struct acpi_device_id __maybe_unused processor_device_ids[] = {
1038 {ACPI_PROCESSOR_OBJECT_HID, },
1039 {ACPI_PROCESSOR_DEVICE_HID, },
1040 {},
1041};
1042MODULE_DEVICE_TABLE(acpi, processor_device_ids);
1043
1044MODULE_ALIAS("acpi");