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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Dave Jones3a58df32009-01-17 22:36:14 -05002 * acpi-cpufreq.c - ACPI Processor P-States Driver
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 * Copyright (C) 2002 - 2004 Dominik Brodowski <linux@brodo.de>
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -07007 * Copyright (C) 2006 Denis Sadykov <denis.m.sadykov@intel.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
9 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or (at
14 * your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License along
22 * with this program; if not, write to the Free Software Foundation, Inc.,
23 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
24 *
25 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
26 */
27
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/kernel.h>
29#include <linux/module.h>
30#include <linux/init.h>
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -070031#include <linux/smp.h>
32#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <linux/cpufreq.h>
Venkatesh Pallipadid395bf12005-08-25 15:59:00 -040034#include <linux/compiler.h>
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -070035#include <linux/dmi.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090036#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
38#include <linux/acpi.h>
Dave Jones3a58df32009-01-17 22:36:14 -050039#include <linux/io.h>
40#include <linux/delay.h>
41#include <linux/uaccess.h>
42
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <acpi/processor.h>
44
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -070045#include <asm/msr.h>
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -070046#include <asm/processor.h>
47#include <asm/cpufeature.h>
Mark Langsdorfa2fed572010-03-18 18:41:46 +010048#include "mperf.h"
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -070049
Linus Torvalds1da177e2005-04-16 15:20:36 -070050MODULE_AUTHOR("Paul Diefenbaugh, Dominik Brodowski");
51MODULE_DESCRIPTION("ACPI Processor P-States Driver");
52MODULE_LICENSE("GPL");
53
Andre Przywaraacd31622012-09-04 08:28:03 +000054#define PFX "acpi-cpufreq: "
55
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -070056enum {
57 UNDEFINED_CAPABLE = 0,
58 SYSTEM_INTEL_MSR_CAPABLE,
Matthew Garrett3dc9a632012-09-04 08:28:02 +000059 SYSTEM_AMD_MSR_CAPABLE,
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -070060 SYSTEM_IO_CAPABLE,
61};
62
63#define INTEL_MSR_RANGE (0xffff)
Matthew Garrett3dc9a632012-09-04 08:28:02 +000064#define AMD_MSR_RANGE (0x7)
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -070065
Andre Przywara615b7302012-09-04 08:28:07 +000066#define MSR_K7_HWCR_CPB_DIS (1ULL << 25)
67
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -070068struct acpi_cpufreq_data {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -070069 struct acpi_processor_performance *acpi_data;
70 struct cpufreq_frequency_table *freq_table;
71 unsigned int resume;
72 unsigned int cpu_feature;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073};
74
Tejun Heof1625062009-10-29 22:34:13 +090075static DEFINE_PER_CPU(struct acpi_cpufreq_data *, acfreq_data);
travis@sgi.comea348f32008-01-30 13:33:12 +010076
Fenghua Yu50109292007-08-07 18:40:30 -040077/* acpi_perf_data is a pointer to percpu data. */
Namhyung Kim3f6c4df2010-08-13 23:00:11 +090078static struct acpi_processor_performance __percpu *acpi_perf_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
80static struct cpufreq_driver acpi_cpufreq_driver;
81
Venkatesh Pallipadid395bf12005-08-25 15:59:00 -040082static unsigned int acpi_pstate_strict;
Andre Przywara615b7302012-09-04 08:28:07 +000083static bool boost_enabled, boost_supported;
84static struct msr __percpu *msrs;
85
86static bool boost_state(unsigned int cpu)
87{
88 u32 lo, hi;
89 u64 msr;
90
91 switch (boot_cpu_data.x86_vendor) {
92 case X86_VENDOR_INTEL:
93 rdmsr_on_cpu(cpu, MSR_IA32_MISC_ENABLE, &lo, &hi);
94 msr = lo | ((u64)hi << 32);
95 return !(msr & MSR_IA32_MISC_ENABLE_TURBO_DISABLE);
96 case X86_VENDOR_AMD:
97 rdmsr_on_cpu(cpu, MSR_K7_HWCR, &lo, &hi);
98 msr = lo | ((u64)hi << 32);
99 return !(msr & MSR_K7_HWCR_CPB_DIS);
100 }
101 return false;
102}
103
104static void boost_set_msrs(bool enable, const struct cpumask *cpumask)
105{
106 u32 cpu;
107 u32 msr_addr;
108 u64 msr_mask;
109
110 switch (boot_cpu_data.x86_vendor) {
111 case X86_VENDOR_INTEL:
112 msr_addr = MSR_IA32_MISC_ENABLE;
113 msr_mask = MSR_IA32_MISC_ENABLE_TURBO_DISABLE;
114 break;
115 case X86_VENDOR_AMD:
116 msr_addr = MSR_K7_HWCR;
117 msr_mask = MSR_K7_HWCR_CPB_DIS;
118 break;
119 default:
120 return;
121 }
122
123 rdmsr_on_cpus(cpumask, msr_addr, msrs);
124
125 for_each_cpu(cpu, cpumask) {
126 struct msr *reg = per_cpu_ptr(msrs, cpu);
127 if (enable)
128 reg->q &= ~msr_mask;
129 else
130 reg->q |= msr_mask;
131 }
132
133 wrmsr_on_cpus(cpumask, msr_addr, msrs);
134}
135
Andre Przywara11269ff2012-09-04 08:28:08 +0000136static ssize_t _store_boost(const char *buf, size_t count)
Andre Przywara615b7302012-09-04 08:28:07 +0000137{
138 int ret;
139 unsigned long val = 0;
140
141 if (!boost_supported)
142 return -EINVAL;
143
144 ret = kstrtoul(buf, 10, &val);
145 if (ret || (val > 1))
146 return -EINVAL;
147
148 if ((val && boost_enabled) || (!val && !boost_enabled))
149 return count;
150
151 get_online_cpus();
152
153 boost_set_msrs(val, cpu_online_mask);
154
155 put_online_cpus();
156
157 boost_enabled = val;
158 pr_debug("Core Boosting %sabled.\n", val ? "en" : "dis");
159
160 return count;
161}
162
Andre Przywara11269ff2012-09-04 08:28:08 +0000163static ssize_t store_global_boost(struct kobject *kobj, struct attribute *attr,
164 const char *buf, size_t count)
165{
166 return _store_boost(buf, count);
167}
168
Andre Przywara615b7302012-09-04 08:28:07 +0000169static ssize_t show_global_boost(struct kobject *kobj,
170 struct attribute *attr, char *buf)
171{
172 return sprintf(buf, "%u\n", boost_enabled);
173}
174
175static struct global_attr global_boost = __ATTR(boost, 0644,
176 show_global_boost,
177 store_global_boost);
Venkatesh Pallipadid395bf12005-08-25 15:59:00 -0400178
Andre Przywara11269ff2012-09-04 08:28:08 +0000179#ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
180static ssize_t store_cpb(struct cpufreq_policy *policy, const char *buf,
181 size_t count)
182{
183 return _store_boost(buf, count);
184}
185
186static ssize_t show_cpb(struct cpufreq_policy *policy, char *buf)
187{
188 return sprintf(buf, "%u\n", boost_enabled);
189}
190
191static struct freq_attr cpb = __ATTR(cpb, 0644, show_cpb, store_cpb);
192#endif
193
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700194static int check_est_cpu(unsigned int cpuid)
195{
Mike Travis92cb7612007-10-19 20:35:04 +0200196 struct cpuinfo_x86 *cpu = &cpu_data(cpuid);
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700197
Harald Welte0de51082009-06-08 18:27:54 +0800198 return cpu_has(cpu, X86_FEATURE_EST);
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700199}
200
Matthew Garrett3dc9a632012-09-04 08:28:02 +0000201static int check_amd_hwpstate_cpu(unsigned int cpuid)
202{
203 struct cpuinfo_x86 *cpu = &cpu_data(cpuid);
204
205 return cpu_has(cpu, X86_FEATURE_HW_PSTATE);
206}
207
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700208static unsigned extract_io(u32 value, struct acpi_cpufreq_data *data)
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700209{
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700210 struct acpi_processor_performance *perf;
211 int i;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700212
213 perf = data->acpi_data;
214
Dave Jones3a58df32009-01-17 22:36:14 -0500215 for (i = 0; i < perf->state_count; i++) {
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700216 if (value == perf->states[i].status)
217 return data->freq_table[i].frequency;
218 }
219 return 0;
220}
221
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700222static unsigned extract_msr(u32 msr, struct acpi_cpufreq_data *data)
223{
224 int i;
Venkatesh Pallipadia6f6e6e62006-10-03 12:37:42 -0700225 struct acpi_processor_performance *perf;
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700226
Matthew Garrett3dc9a632012-09-04 08:28:02 +0000227 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
228 msr &= AMD_MSR_RANGE;
229 else
230 msr &= INTEL_MSR_RANGE;
231
Venkatesh Pallipadia6f6e6e62006-10-03 12:37:42 -0700232 perf = data->acpi_data;
233
Dave Jones3a58df32009-01-17 22:36:14 -0500234 for (i = 0; data->freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
Venkatesh Pallipadia6f6e6e62006-10-03 12:37:42 -0700235 if (msr == perf->states[data->freq_table[i].index].status)
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700236 return data->freq_table[i].frequency;
237 }
238 return data->freq_table[0].frequency;
239}
240
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700241static unsigned extract_freq(u32 val, struct acpi_cpufreq_data *data)
242{
243 switch (data->cpu_feature) {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700244 case SYSTEM_INTEL_MSR_CAPABLE:
Matthew Garrett3dc9a632012-09-04 08:28:02 +0000245 case SYSTEM_AMD_MSR_CAPABLE:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700246 return extract_msr(val, data);
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700247 case SYSTEM_IO_CAPABLE:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700248 return extract_io(val, data);
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700249 default:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700250 return 0;
251 }
252}
253
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700254struct msr_addr {
255 u32 reg;
256};
257
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700258struct io_addr {
259 u16 port;
260 u8 bit_width;
261};
262
263struct drv_cmd {
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700264 unsigned int type;
Ingo Molnarbfa318a2009-01-15 15:46:08 +0100265 const struct cpumask *mask;
Dave Jones3a58df32009-01-17 22:36:14 -0500266 union {
267 struct msr_addr msr;
268 struct io_addr io;
269 } addr;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700270 u32 val;
271};
272
Andrew Morton01599fc2009-04-13 10:27:49 -0700273/* Called via smp_call_function_single(), on the target CPU */
274static void do_drv_read(void *_cmd)
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700275{
Mike Travis72859082009-01-16 15:31:15 -0800276 struct drv_cmd *cmd = _cmd;
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700277 u32 h;
278
279 switch (cmd->type) {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700280 case SYSTEM_INTEL_MSR_CAPABLE:
Matthew Garrett3dc9a632012-09-04 08:28:02 +0000281 case SYSTEM_AMD_MSR_CAPABLE:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700282 rdmsr(cmd->addr.msr.reg, cmd->val, h);
283 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700284 case SYSTEM_IO_CAPABLE:
Venkatesh Pallipadi4e581ff2006-12-13 10:41:16 -0800285 acpi_os_read_port((acpi_io_address)cmd->addr.io.port,
286 &cmd->val,
287 (u32)cmd->addr.io.bit_width);
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700288 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700289 default:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700290 break;
291 }
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700292}
293
Andrew Morton01599fc2009-04-13 10:27:49 -0700294/* Called via smp_call_function_many(), on the target CPUs */
295static void do_drv_write(void *_cmd)
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700296{
Mike Travis72859082009-01-16 15:31:15 -0800297 struct drv_cmd *cmd = _cmd;
Venki Pallipadi13424f62007-05-23 15:42:13 -0700298 u32 lo, hi;
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700299
300 switch (cmd->type) {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700301 case SYSTEM_INTEL_MSR_CAPABLE:
Venki Pallipadi13424f62007-05-23 15:42:13 -0700302 rdmsr(cmd->addr.msr.reg, lo, hi);
303 lo = (lo & ~INTEL_MSR_RANGE) | (cmd->val & INTEL_MSR_RANGE);
304 wrmsr(cmd->addr.msr.reg, lo, hi);
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700305 break;
Matthew Garrett3dc9a632012-09-04 08:28:02 +0000306 case SYSTEM_AMD_MSR_CAPABLE:
307 wrmsr(cmd->addr.msr.reg, cmd->val, 0);
308 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700309 case SYSTEM_IO_CAPABLE:
Venkatesh Pallipadi4e581ff2006-12-13 10:41:16 -0800310 acpi_os_write_port((acpi_io_address)cmd->addr.io.port,
311 cmd->val,
312 (u32)cmd->addr.io.bit_width);
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700313 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700314 default:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700315 break;
316 }
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700317}
318
Dave Jones95dd7222006-10-18 00:41:48 -0400319static void drv_read(struct drv_cmd *cmd)
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700320{
Andrew Morton4a283952009-12-21 16:19:58 -0800321 int err;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700322 cmd->val = 0;
323
Andrew Morton4a283952009-12-21 16:19:58 -0800324 err = smp_call_function_any(cmd->mask, do_drv_read, cmd, 1);
325 WARN_ON_ONCE(err); /* smp_call_function_any() was buggy? */
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700326}
327
328static void drv_write(struct drv_cmd *cmd)
329{
Linus Torvaldsea34f432009-04-15 08:05:13 -0700330 int this_cpu;
331
332 this_cpu = get_cpu();
333 if (cpumask_test_cpu(this_cpu, cmd->mask))
334 do_drv_write(cmd);
Andrew Morton01599fc2009-04-13 10:27:49 -0700335 smp_call_function_many(cmd->mask, do_drv_write, cmd, 1);
Linus Torvaldsea34f432009-04-15 08:05:13 -0700336 put_cpu();
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700337}
338
Mike Travis4d8bb532009-01-04 05:18:08 -0800339static u32 get_cur_val(const struct cpumask *mask)
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700340{
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700341 struct acpi_processor_performance *perf;
342 struct drv_cmd cmd;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700343
Mike Travis4d8bb532009-01-04 05:18:08 -0800344 if (unlikely(cpumask_empty(mask)))
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700345 return 0;
346
Tejun Heof1625062009-10-29 22:34:13 +0900347 switch (per_cpu(acfreq_data, cpumask_first(mask))->cpu_feature) {
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700348 case SYSTEM_INTEL_MSR_CAPABLE:
349 cmd.type = SYSTEM_INTEL_MSR_CAPABLE;
Ross Lagerwall8673b832013-05-31 20:45:17 +0100350 cmd.addr.msr.reg = MSR_IA32_PERF_CTL;
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700351 break;
Matthew Garrett3dc9a632012-09-04 08:28:02 +0000352 case SYSTEM_AMD_MSR_CAPABLE:
353 cmd.type = SYSTEM_AMD_MSR_CAPABLE;
Ross Lagerwall8673b832013-05-31 20:45:17 +0100354 cmd.addr.msr.reg = MSR_AMD_PERF_CTL;
Matthew Garrett3dc9a632012-09-04 08:28:02 +0000355 break;
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700356 case SYSTEM_IO_CAPABLE:
357 cmd.type = SYSTEM_IO_CAPABLE;
Tejun Heof1625062009-10-29 22:34:13 +0900358 perf = per_cpu(acfreq_data, cpumask_first(mask))->acpi_data;
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700359 cmd.addr.io.port = perf->control_register.address;
360 cmd.addr.io.bit_width = perf->control_register.bit_width;
361 break;
362 default:
363 return 0;
364 }
365
Ingo Molnarbfa318a2009-01-15 15:46:08 +0100366 cmd.mask = mask;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700367 drv_read(&cmd);
368
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200369 pr_debug("get_cur_val = %u\n", cmd.val);
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700370
371 return cmd.val;
372}
373
374static unsigned int get_cur_freq_on_cpu(unsigned int cpu)
375{
Tejun Heof1625062009-10-29 22:34:13 +0900376 struct acpi_cpufreq_data *data = per_cpu(acfreq_data, cpu);
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700377 unsigned int freq;
Venkatesh Pallipadie56a7272008-04-28 15:13:43 -0400378 unsigned int cached_freq;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700379
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200380 pr_debug("get_cur_freq_on_cpu (%d)\n", cpu);
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700381
382 if (unlikely(data == NULL ||
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700383 data->acpi_data == NULL || data->freq_table == NULL)) {
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700384 return 0;
385 }
386
Venkatesh Pallipadie56a7272008-04-28 15:13:43 -0400387 cached_freq = data->freq_table[data->acpi_data->state].frequency;
Mike Travise39ad412009-01-04 05:18:10 -0800388 freq = extract_freq(get_cur_val(cpumask_of(cpu)), data);
Venkatesh Pallipadie56a7272008-04-28 15:13:43 -0400389 if (freq != cached_freq) {
390 /*
391 * The dreaded BIOS frequency change behind our back.
392 * Force set the frequency on next target call.
393 */
394 data->resume = 1;
395 }
396
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200397 pr_debug("cur freq = %u\n", freq);
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700398
399 return freq;
400}
401
Mike Travis72859082009-01-16 15:31:15 -0800402static unsigned int check_freqs(const struct cpumask *mask, unsigned int freq,
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700403 struct acpi_cpufreq_data *data)
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700404{
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700405 unsigned int cur_freq;
406 unsigned int i;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700407
Dave Jones3a58df32009-01-17 22:36:14 -0500408 for (i = 0; i < 100; i++) {
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700409 cur_freq = extract_freq(get_cur_val(mask), data);
410 if (cur_freq == freq)
411 return 1;
412 udelay(10);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 }
414 return 0;
415}
416
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700417static int acpi_cpufreq_target(struct cpufreq_policy *policy,
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700418 unsigned int target_freq, unsigned int relation)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419{
Tejun Heof1625062009-10-29 22:34:13 +0900420 struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700421 struct acpi_processor_performance *perf;
422 struct cpufreq_freqs freqs;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700423 struct drv_cmd cmd;
Venkatesh Pallipadi8edc59d92006-12-19 12:58:55 -0800424 unsigned int next_state = 0; /* Index into freq_table */
425 unsigned int next_perf_state = 0; /* Index into perf table */
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700426 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200428 pr_debug("acpi_cpufreq_target %d (%d)\n", target_freq, policy->cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700430 if (unlikely(data == NULL ||
Dave Jones95dd7222006-10-18 00:41:48 -0400431 data->acpi_data == NULL || data->freq_table == NULL)) {
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700432 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 }
434
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500435 perf = data->acpi_data;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700436 result = cpufreq_frequency_table_target(policy,
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700437 data->freq_table,
438 target_freq,
439 relation, &next_state);
Mike Travis4d8bb532009-01-04 05:18:08 -0800440 if (unlikely(result)) {
441 result = -ENODEV;
442 goto out;
443 }
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500444
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700445 next_perf_state = data->freq_table[next_state].index;
Venkatesh Pallipadi7650b282006-10-03 12:36:30 -0700446 if (perf->state == next_perf_state) {
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700447 if (unlikely(data->resume)) {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200448 pr_debug("Called after resume, resetting to P%d\n",
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700449 next_perf_state);
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700450 data->resume = 0;
451 } else {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200452 pr_debug("Already at target state (P%d)\n",
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700453 next_perf_state);
Mike Travis4d8bb532009-01-04 05:18:08 -0800454 goto out;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700455 }
456 }
457
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700458 switch (data->cpu_feature) {
459 case SYSTEM_INTEL_MSR_CAPABLE:
460 cmd.type = SYSTEM_INTEL_MSR_CAPABLE;
461 cmd.addr.msr.reg = MSR_IA32_PERF_CTL;
Venki Pallipadi13424f62007-05-23 15:42:13 -0700462 cmd.val = (u32) perf->states[next_perf_state].control;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700463 break;
Matthew Garrett3dc9a632012-09-04 08:28:02 +0000464 case SYSTEM_AMD_MSR_CAPABLE:
465 cmd.type = SYSTEM_AMD_MSR_CAPABLE;
466 cmd.addr.msr.reg = MSR_AMD_PERF_CTL;
467 cmd.val = (u32) perf->states[next_perf_state].control;
468 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700469 case SYSTEM_IO_CAPABLE:
470 cmd.type = SYSTEM_IO_CAPABLE;
471 cmd.addr.io.port = perf->control_register.address;
472 cmd.addr.io.bit_width = perf->control_register.bit_width;
473 cmd.val = (u32) perf->states[next_perf_state].control;
474 break;
475 default:
Mike Travis4d8bb532009-01-04 05:18:08 -0800476 result = -ENODEV;
477 goto out;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700478 }
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700479
Mike Travis4d8bb532009-01-04 05:18:08 -0800480 /* cpufreq holds the hotplug lock, so we are safe from here on */
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700481 if (policy->shared_type != CPUFREQ_SHARED_TYPE_ANY)
Ingo Molnarbfa318a2009-01-15 15:46:08 +0100482 cmd.mask = policy->cpus;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700483 else
Ingo Molnarbfa318a2009-01-15 15:46:08 +0100484 cmd.mask = cpumask_of(policy->cpu);
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700485
Venkatesh Pallipadi8edc59d92006-12-19 12:58:55 -0800486 freqs.old = perf->states[perf->state].core_frequency * 1000;
487 freqs.new = data->freq_table[next_state].frequency;
Viresh Kumarb43a7ff2013-03-24 11:56:43 +0530488 cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500489
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700490 drv_write(&cmd);
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500491
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700492 if (acpi_pstate_strict) {
Mike Travis4d8bb532009-01-04 05:18:08 -0800493 if (!check_freqs(cmd.mask, freqs.new, data)) {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200494 pr_debug("acpi_cpufreq_target failed (%d)\n",
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700495 policy->cpu);
Mike Travis4d8bb532009-01-04 05:18:08 -0800496 result = -EAGAIN;
497 goto out;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500498 }
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500499 }
500
Viresh Kumarb43a7ff2013-03-24 11:56:43 +0530501 cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700502 perf->state = next_perf_state;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500503
Mike Travis4d8bb532009-01-04 05:18:08 -0800504out:
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700505 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506}
507
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700508static int acpi_cpufreq_verify(struct cpufreq_policy *policy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509{
Tejun Heof1625062009-10-29 22:34:13 +0900510 struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200512 pr_debug("acpi_cpufreq_verify\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700514 return cpufreq_frequency_table_verify(policy, data->freq_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515}
516
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517static unsigned long
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700518acpi_cpufreq_guess_freq(struct acpi_cpufreq_data *data, unsigned int cpu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519{
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700520 struct acpi_processor_performance *perf = data->acpi_data;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500521
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 if (cpu_khz) {
523 /* search the closest match to cpu_khz */
524 unsigned int i;
525 unsigned long freq;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500526 unsigned long freqn = perf->states[0].core_frequency * 1000;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527
Dave Jones3a58df32009-01-17 22:36:14 -0500528 for (i = 0; i < (perf->state_count-1); i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 freq = freqn;
Dave Jones95dd7222006-10-18 00:41:48 -0400530 freqn = perf->states[i+1].core_frequency * 1000;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 if ((2 * cpu_khz) > (freqn + freq)) {
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500532 perf->state = i;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700533 return freq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 }
535 }
Dave Jones95dd7222006-10-18 00:41:48 -0400536 perf->state = perf->state_count-1;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700537 return freqn;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500538 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 /* assume CPU is at P0... */
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500540 perf->state = 0;
541 return perf->states[0].core_frequency * 1000;
542 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543}
544
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800545static void free_acpi_perf_data(void)
546{
547 unsigned int i;
548
549 /* Freeing a NULL pointer is OK, and alloc_percpu zeroes. */
550 for_each_possible_cpu(i)
551 free_cpumask_var(per_cpu_ptr(acpi_perf_data, i)
552 ->shared_cpu_map);
553 free_percpu(acpi_perf_data);
554}
555
Andre Przywara615b7302012-09-04 08:28:07 +0000556static int boost_notify(struct notifier_block *nb, unsigned long action,
557 void *hcpu)
558{
559 unsigned cpu = (long)hcpu;
560 const struct cpumask *cpumask;
561
562 cpumask = get_cpu_mask(cpu);
563
564 /*
565 * Clear the boost-disable bit on the CPU_DOWN path so that
566 * this cpu cannot block the remaining ones from boosting. On
567 * the CPU_UP path we simply keep the boost-disable flag in
568 * sync with the current global state.
569 */
570
571 switch (action) {
572 case CPU_UP_PREPARE:
573 case CPU_UP_PREPARE_FROZEN:
574 boost_set_msrs(boost_enabled, cpumask);
575 break;
576
577 case CPU_DOWN_PREPARE:
578 case CPU_DOWN_PREPARE_FROZEN:
579 boost_set_msrs(1, cpumask);
580 break;
581
582 default:
583 break;
584 }
585
586 return NOTIFY_OK;
587}
588
589
590static struct notifier_block boost_nb = {
591 .notifier_call = boost_notify,
592};
593
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500594/*
595 * acpi_cpufreq_early_init - initialize ACPI P-States library
596 *
597 * Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c)
598 * in order to determine correct frequency and voltage pairings. We can
599 * do _PDC and _PSD and find out the processor dependency for the
600 * actual init that will happen later...
601 */
Fenghua Yu50109292007-08-07 18:40:30 -0400602static int __init acpi_cpufreq_early_init(void)
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500603{
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800604 unsigned int i;
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200605 pr_debug("acpi_cpufreq_early_init\n");
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500606
Fenghua Yu50109292007-08-07 18:40:30 -0400607 acpi_perf_data = alloc_percpu(struct acpi_processor_performance);
608 if (!acpi_perf_data) {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200609 pr_debug("Memory allocation error for acpi_perf_data.\n");
Fenghua Yu50109292007-08-07 18:40:30 -0400610 return -ENOMEM;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500611 }
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800612 for_each_possible_cpu(i) {
Yinghai Lueaa95842009-06-06 14:51:36 -0700613 if (!zalloc_cpumask_var_node(
Mike Travis80855f72008-12-31 18:08:47 -0800614 &per_cpu_ptr(acpi_perf_data, i)->shared_cpu_map,
615 GFP_KERNEL, cpu_to_node(i))) {
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800616
617 /* Freeing a NULL pointer is OK: alloc_percpu zeroes. */
618 free_acpi_perf_data();
619 return -ENOMEM;
620 }
621 }
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500622
623 /* Do initialization in ACPI core */
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700624 acpi_processor_preregister_performance(acpi_perf_data);
625 return 0;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500626}
627
Dave Jones95625b82006-10-21 01:37:39 -0400628#ifdef CONFIG_SMP
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700629/*
630 * Some BIOSes do SW_ANY coordination internally, either set it up in hw
631 * or do it in BIOS firmware and won't inform about it to OS. If not
632 * detected, this has a side effect of making CPU run at a different speed
633 * than OS intended it to run at. Detect it and handle it cleanly.
634 */
635static int bios_with_sw_any_bug;
636
Jeff Garzik18552562007-10-03 15:15:40 -0400637static int sw_any_bug_found(const struct dmi_system_id *d)
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700638{
639 bios_with_sw_any_bug = 1;
640 return 0;
641}
642
Jeff Garzik18552562007-10-03 15:15:40 -0400643static const struct dmi_system_id sw_any_bug_dmi_table[] = {
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700644 {
645 .callback = sw_any_bug_found,
646 .ident = "Supermicro Server X6DLP",
647 .matches = {
648 DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
649 DMI_MATCH(DMI_BIOS_VERSION, "080010"),
650 DMI_MATCH(DMI_PRODUCT_NAME, "X6DLP"),
651 },
652 },
653 { }
654};
Prarit Bhargava1a8e42f2009-08-26 13:19:37 -0400655
656static int acpi_cpufreq_blacklist(struct cpuinfo_x86 *c)
657{
John Villalovos293afe42009-09-25 13:30:08 -0400658 /* Intel Xeon Processor 7100 Series Specification Update
659 * http://www.intel.com/Assets/PDF/specupdate/314554.pdf
Prarit Bhargava1a8e42f2009-08-26 13:19:37 -0400660 * AL30: A Machine Check Exception (MCE) Occurring during an
661 * Enhanced Intel SpeedStep Technology Ratio Change May Cause
John Villalovos293afe42009-09-25 13:30:08 -0400662 * Both Processor Cores to Lock Up. */
Prarit Bhargava1a8e42f2009-08-26 13:19:37 -0400663 if (c->x86_vendor == X86_VENDOR_INTEL) {
664 if ((c->x86 == 15) &&
665 (c->x86_model == 6) &&
John Villalovos293afe42009-09-25 13:30:08 -0400666 (c->x86_mask == 8)) {
667 printk(KERN_INFO "acpi-cpufreq: Intel(R) "
668 "Xeon(R) 7100 Errata AL30, processors may "
669 "lock up on frequency changes: disabling "
670 "acpi-cpufreq.\n");
Prarit Bhargava1a8e42f2009-08-26 13:19:37 -0400671 return -ENODEV;
John Villalovos293afe42009-09-25 13:30:08 -0400672 }
Prarit Bhargava1a8e42f2009-08-26 13:19:37 -0400673 }
674 return 0;
675}
Dave Jones95625b82006-10-21 01:37:39 -0400676#endif
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700677
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700678static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679{
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700680 unsigned int i;
681 unsigned int valid_states = 0;
682 unsigned int cpu = policy->cpu;
683 struct acpi_cpufreq_data *data;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700684 unsigned int result = 0;
Mike Travis92cb7612007-10-19 20:35:04 +0200685 struct cpuinfo_x86 *c = &cpu_data(policy->cpu);
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700686 struct acpi_processor_performance *perf;
John Villalovos293afe42009-09-25 13:30:08 -0400687#ifdef CONFIG_SMP
688 static int blacklisted;
689#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200691 pr_debug("acpi_cpufreq_cpu_init\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692
Prarit Bhargava1a8e42f2009-08-26 13:19:37 -0400693#ifdef CONFIG_SMP
John Villalovos293afe42009-09-25 13:30:08 -0400694 if (blacklisted)
695 return blacklisted;
696 blacklisted = acpi_cpufreq_blacklist(c);
697 if (blacklisted)
698 return blacklisted;
Prarit Bhargava1a8e42f2009-08-26 13:19:37 -0400699#endif
700
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700701 data = kzalloc(sizeof(struct acpi_cpufreq_data), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 if (!data)
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700703 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704
Rusty Russellb36128c2009-02-20 16:29:08 +0900705 data->acpi_data = per_cpu_ptr(acpi_perf_data, cpu);
Tejun Heof1625062009-10-29 22:34:13 +0900706 per_cpu(acfreq_data, cpu) = data;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700707
Dave Jones95dd7222006-10-18 00:41:48 -0400708 if (cpu_has(c, X86_FEATURE_CONSTANT_TSC))
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700709 acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500711 result = acpi_processor_register_performance(data->acpi_data, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 if (result)
713 goto err_free;
714
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500715 perf = data->acpi_data;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500716 policy->shared_type = perf->shared_type;
Dave Jones95dd7222006-10-18 00:41:48 -0400717
Venkatesh Pallipadi46f18e32006-06-26 00:34:43 -0400718 /*
Dave Jones95dd7222006-10-18 00:41:48 -0400719 * Will let policy->cpus know about dependency only when software
Venkatesh Pallipadi46f18e32006-06-26 00:34:43 -0400720 * coordination is required.
721 */
722 if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL ||
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700723 policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) {
Rusty Russell835481d2009-01-04 05:18:06 -0800724 cpumask_copy(policy->cpus, perf->shared_cpu_map);
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700725 }
726
727#ifdef CONFIG_SMP
728 dmi_check_system(sw_any_bug_dmi_table);
Fabio Baltieri2624f902013-01-31 09:44:40 +0000729 if (bios_with_sw_any_bug && !policy_is_shared(policy)) {
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700730 policy->shared_type = CPUFREQ_SHARED_TYPE_ALL;
Rusty Russell835481d2009-01-04 05:18:06 -0800731 cpumask_copy(policy->cpus, cpu_core_mask(cpu));
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700732 }
Andre Przywaraacd31622012-09-04 08:28:03 +0000733
734 if (check_amd_hwpstate_cpu(cpu) && !acpi_pstate_strict) {
735 cpumask_clear(policy->cpus);
736 cpumask_set_cpu(cpu, policy->cpus);
Andre Przywaraacd31622012-09-04 08:28:03 +0000737 policy->shared_type = CPUFREQ_SHARED_TYPE_HW;
738 pr_info_once(PFX "overriding BIOS provided _PSD data\n");
739 }
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700740#endif
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500741
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 /* capability check */
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500743 if (perf->state_count <= 1) {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200744 pr_debug("No P-States\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 result = -ENODEV;
746 goto err_unreg;
747 }
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500748
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700749 if (perf->control_register.space_id != perf->status_register.space_id) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 result = -ENODEV;
751 goto err_unreg;
752 }
753
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700754 switch (perf->control_register.space_id) {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700755 case ACPI_ADR_SPACE_SYSTEM_IO:
Matthew Garrettc40a4512013-01-20 10:24:26 +0000756 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
757 boot_cpu_data.x86 == 0xf) {
758 pr_debug("AMD K8 systems must use native drivers.\n");
759 result = -ENODEV;
760 goto err_unreg;
761 }
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200762 pr_debug("SYSTEM IO addr space\n");
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700763 data->cpu_feature = SYSTEM_IO_CAPABLE;
764 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700765 case ACPI_ADR_SPACE_FIXED_HARDWARE:
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200766 pr_debug("HARDWARE addr space\n");
Matthew Garrett3dc9a632012-09-04 08:28:02 +0000767 if (check_est_cpu(cpu)) {
768 data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE;
769 break;
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700770 }
Matthew Garrett3dc9a632012-09-04 08:28:02 +0000771 if (check_amd_hwpstate_cpu(cpu)) {
772 data->cpu_feature = SYSTEM_AMD_MSR_CAPABLE;
773 break;
774 }
775 result = -ENODEV;
776 goto err_unreg;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700777 default:
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200778 pr_debug("Unknown addr space %d\n",
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700779 (u32) (perf->control_register.space_id));
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700780 result = -ENODEV;
781 goto err_unreg;
782 }
783
Dave Jones95dd7222006-10-18 00:41:48 -0400784 data->freq_table = kmalloc(sizeof(struct cpufreq_frequency_table) *
785 (perf->state_count+1), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 if (!data->freq_table) {
787 result = -ENOMEM;
788 goto err_unreg;
789 }
790
791 /* detect transition latency */
792 policy->cpuinfo.transition_latency = 0;
Dave Jones3a58df32009-01-17 22:36:14 -0500793 for (i = 0; i < perf->state_count; i++) {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700794 if ((perf->states[i].transition_latency * 1000) >
795 policy->cpuinfo.transition_latency)
796 policy->cpuinfo.transition_latency =
797 perf->states[i].transition_latency * 1000;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799
Pallipadi, Venkatesha59d1632009-03-19 14:41:40 -0700800 /* Check for high latency (>20uS) from buggy BIOSes, like on T42 */
801 if (perf->control_register.space_id == ACPI_ADR_SPACE_FIXED_HARDWARE &&
802 policy->cpuinfo.transition_latency > 20 * 1000) {
Pallipadi, Venkatesha59d1632009-03-19 14:41:40 -0700803 policy->cpuinfo.transition_latency = 20 * 1000;
Joe Perches61c8c672009-05-26 14:58:39 -0700804 printk_once(KERN_INFO
805 "P-state transition latency capped at 20 uS\n");
Pallipadi, Venkatesha59d1632009-03-19 14:41:40 -0700806 }
807
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 /* table init */
Dave Jones3a58df32009-01-17 22:36:14 -0500809 for (i = 0; i < perf->state_count; i++) {
810 if (i > 0 && perf->states[i].core_frequency >=
Zhang Rui3cdf5522007-06-13 21:24:02 -0400811 data->freq_table[valid_states-1].frequency / 1000)
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700812 continue;
813
814 data->freq_table[valid_states].index = i;
815 data->freq_table[valid_states].frequency =
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700816 perf->states[i].core_frequency * 1000;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700817 valid_states++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 }
Venkatesh Pallipadi3d4a7ef2006-11-13 17:47:44 -0800819 data->freq_table[valid_states].frequency = CPUFREQ_TABLE_END;
Venkatesh Pallipadi8edc59d92006-12-19 12:58:55 -0800820 perf->state = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821
822 result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table);
Dave Jones95dd7222006-10-18 00:41:48 -0400823 if (result)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824 goto err_freqfree;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825
Thomas Renningerd876dfb2009-04-17 16:22:08 +0200826 if (perf->states[0].core_frequency * 1000 != policy->cpuinfo.max_freq)
827 printk(KERN_WARNING FW_WARN "P-state 0 is not max freq\n");
828
Mattia Dongilia507ac42006-12-15 19:52:45 +0100829 switch (perf->control_register.space_id) {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700830 case ACPI_ADR_SPACE_SYSTEM_IO:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700831 /* Current speed is unknown and not detectable by IO port */
832 policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu);
833 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700834 case ACPI_ADR_SPACE_FIXED_HARDWARE:
Venkatesh Pallipadi7650b282006-10-03 12:36:30 -0700835 acpi_cpufreq_driver.get = get_cur_freq_on_cpu;
Mattia Dongilia507ac42006-12-15 19:52:45 +0100836 policy->cur = get_cur_freq_on_cpu(cpu);
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700837 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700838 default:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700839 break;
840 }
841
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 /* notify BIOS that we exist */
843 acpi_processor_notify_smm(THIS_MODULE);
844
Venkatesh Pallipadidfde5d62006-10-03 12:38:45 -0700845 /* Check for APERF/MPERF support in hardware */
Matthew Garrett92e03c42011-07-13 17:58:32 -0400846 if (boot_cpu_has(X86_FEATURE_APERFMPERF))
Mark Langsdorfa2fed572010-03-18 18:41:46 +0100847 acpi_cpufreq_driver.getavg = cpufreq_get_measured_perf;
Venkatesh Pallipadidfde5d62006-10-03 12:38:45 -0700848
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200849 pr_debug("CPU%u - ACPI performance management activated.\n", cpu);
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500850 for (i = 0; i < perf->state_count; i++)
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200851 pr_debug(" %cP%d: %d MHz, %d mW, %d uS\n",
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700852 (i == perf->state ? '*' : ' '), i,
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500853 (u32) perf->states[i].core_frequency,
854 (u32) perf->states[i].power,
855 (u32) perf->states[i].transition_latency);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856
857 cpufreq_frequency_table_get_attr(data->freq_table, policy->cpu);
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700858
Dominik Brodowski4b31e772005-05-18 13:49:00 -0400859 /*
860 * the first call to ->target() should result in us actually
861 * writing something to the appropriate registers.
862 */
863 data->resume = 1;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700864
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700865 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866
Dave Jones95dd7222006-10-18 00:41:48 -0400867err_freqfree:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 kfree(data->freq_table);
Dave Jones95dd7222006-10-18 00:41:48 -0400869err_unreg:
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500870 acpi_processor_unregister_performance(perf, cpu);
Dave Jones95dd7222006-10-18 00:41:48 -0400871err_free:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 kfree(data);
Tejun Heof1625062009-10-29 22:34:13 +0900873 per_cpu(acfreq_data, cpu) = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700875 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876}
877
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700878static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879{
Tejun Heof1625062009-10-29 22:34:13 +0900880 struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200882 pr_debug("acpi_cpufreq_cpu_exit\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883
884 if (data) {
885 cpufreq_frequency_table_put_attr(policy->cpu);
Tejun Heof1625062009-10-29 22:34:13 +0900886 per_cpu(acfreq_data, policy->cpu) = NULL;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700887 acpi_processor_unregister_performance(data->acpi_data,
888 policy->cpu);
Zhang Ruidab5fff2010-10-12 09:09:37 +0800889 kfree(data->freq_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 kfree(data);
891 }
892
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700893 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894}
895
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700896static int acpi_cpufreq_resume(struct cpufreq_policy *policy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897{
Tejun Heof1625062009-10-29 22:34:13 +0900898 struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200900 pr_debug("acpi_cpufreq_resume\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901
902 data->resume = 1;
903
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700904 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905}
906
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700907static struct freq_attr *acpi_cpufreq_attr[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 &cpufreq_freq_attr_scaling_available_freqs,
Andre Przywara11269ff2012-09-04 08:28:08 +0000909 NULL, /* this is a placeholder for cpb, do not remove */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910 NULL,
911};
912
913static struct cpufreq_driver acpi_cpufreq_driver = {
Thomas Renningere2f74f32009-11-19 12:31:01 +0100914 .verify = acpi_cpufreq_verify,
915 .target = acpi_cpufreq_target,
916 .bios_limit = acpi_processor_get_bios_limit,
917 .init = acpi_cpufreq_cpu_init,
918 .exit = acpi_cpufreq_cpu_exit,
919 .resume = acpi_cpufreq_resume,
920 .name = "acpi-cpufreq",
921 .owner = THIS_MODULE,
922 .attr = acpi_cpufreq_attr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923};
924
Andre Przywara615b7302012-09-04 08:28:07 +0000925static void __init acpi_cpufreq_boost_init(void)
926{
927 if (boot_cpu_has(X86_FEATURE_CPB) || boot_cpu_has(X86_FEATURE_IDA)) {
928 msrs = msrs_alloc();
929
930 if (!msrs)
931 return;
932
933 boost_supported = true;
934 boost_enabled = boost_state(0);
935
936 get_online_cpus();
937
938 /* Force all MSRs to the same value */
939 boost_set_msrs(boost_enabled, cpu_online_mask);
940
941 register_cpu_notifier(&boost_nb);
942
943 put_online_cpus();
944 } else
945 global_boost.attr.mode = 0444;
946
947 /* We create the boost file in any case, though for systems without
948 * hardware support it will be read-only and hardwired to return 0.
949 */
950 if (sysfs_create_file(cpufreq_global_kobject, &(global_boost.attr)))
951 pr_warn(PFX "could not register global boost sysfs file\n");
952 else
953 pr_debug("registered global boost sysfs file\n");
954}
955
956static void __exit acpi_cpufreq_boost_exit(void)
957{
958 sysfs_remove_file(cpufreq_global_kobject, &(global_boost.attr));
959
960 if (msrs) {
961 unregister_cpu_notifier(&boost_nb);
962
963 msrs_free(msrs);
964 msrs = NULL;
965 }
966}
967
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700968static int __init acpi_cpufreq_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969{
Fenghua Yu50109292007-08-07 18:40:30 -0400970 int ret;
971
Yinghai Luee297532008-09-24 19:04:31 -0700972 if (acpi_disabled)
973 return 0;
974
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200975 pr_debug("acpi_cpufreq_init\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976
Fenghua Yu50109292007-08-07 18:40:30 -0400977 ret = acpi_cpufreq_early_init();
978 if (ret)
979 return ret;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500980
Andre Przywara11269ff2012-09-04 08:28:08 +0000981#ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
982 /* this is a sysfs file with a strange name and an even stranger
983 * semantic - per CPU instantiation, but system global effect.
984 * Lets enable it only on AMD CPUs for compatibility reasons and
985 * only if configured. This is considered legacy code, which
986 * will probably be removed at some point in the future.
987 */
988 if (check_amd_hwpstate_cpu(0)) {
989 struct freq_attr **iter;
990
991 pr_debug("adding sysfs entry for cpb\n");
992
993 for (iter = acpi_cpufreq_attr; *iter != NULL; iter++)
994 ;
995
996 /* make sure there is a terminator behind it */
997 if (iter[1] == NULL)
998 *iter = &cpb;
999 }
1000#endif
1001
Akinobu Mita847aef62008-07-14 11:59:44 +09001002 ret = cpufreq_register_driver(&acpi_cpufreq_driver);
1003 if (ret)
Rusty Russell2fdf66b2008-12-31 18:08:47 -08001004 free_acpi_perf_data();
Andre Przywara615b7302012-09-04 08:28:07 +00001005 else
1006 acpi_cpufreq_boost_init();
Akinobu Mita847aef62008-07-14 11:59:44 +09001007
1008 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009}
1010
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -07001011static void __exit acpi_cpufreq_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012{
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +02001013 pr_debug("acpi_cpufreq_exit\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014
Andre Przywara615b7302012-09-04 08:28:07 +00001015 acpi_cpufreq_boost_exit();
1016
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 cpufreq_unregister_driver(&acpi_cpufreq_driver);
1018
Luming Yu50f4ddd2011-07-08 16:37:44 -04001019 free_acpi_perf_data();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020}
1021
Venkatesh Pallipadid395bf12005-08-25 15:59:00 -04001022module_param(acpi_pstate_strict, uint, 0644);
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -07001023MODULE_PARM_DESC(acpi_pstate_strict,
Dave Jones95dd7222006-10-18 00:41:48 -04001024 "value 0 or non-zero. non-zero -> strict ACPI checks are "
1025 "performed during frequency changes.");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026
1027late_initcall(acpi_cpufreq_init);
1028module_exit(acpi_cpufreq_exit);
1029
Matthew Garrettefa17192013-01-22 22:33:46 +01001030static const struct x86_cpu_id acpi_cpufreq_ids[] = {
1031 X86_FEATURE_MATCH(X86_FEATURE_ACPI),
1032 X86_FEATURE_MATCH(X86_FEATURE_HW_PSTATE),
1033 {}
1034};
1035MODULE_DEVICE_TABLE(x86cpu, acpi_cpufreq_ids);
1036
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037MODULE_ALIAS("acpi");