blob: 4e04e1274388744efa6689da9fb7922974182999 [file] [log] [blame]
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
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -070054enum {
55 UNDEFINED_CAPABLE = 0,
56 SYSTEM_INTEL_MSR_CAPABLE,
57 SYSTEM_IO_CAPABLE,
58};
59
60#define INTEL_MSR_RANGE (0xffff)
61
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -070062struct acpi_cpufreq_data {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -070063 struct acpi_processor_performance *acpi_data;
64 struct cpufreq_frequency_table *freq_table;
65 unsigned int resume;
66 unsigned int cpu_feature;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067};
68
Tejun Heof1625062009-10-29 22:34:13 +090069static DEFINE_PER_CPU(struct acpi_cpufreq_data *, acfreq_data);
travis@sgi.comea348f32008-01-30 13:33:12 +010070
Fenghua Yu50109292007-08-07 18:40:30 -040071/* acpi_perf_data is a pointer to percpu data. */
Namhyung Kim3f6c4df2010-08-13 23:00:11 +090072static struct acpi_processor_performance __percpu *acpi_perf_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
74static struct cpufreq_driver acpi_cpufreq_driver;
75
Venkatesh Pallipadid395bf12005-08-25 15:59:00 -040076static unsigned int acpi_pstate_strict;
77
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -070078static int check_est_cpu(unsigned int cpuid)
79{
Mike Travis92cb7612007-10-19 20:35:04 +020080 struct cpuinfo_x86 *cpu = &cpu_data(cpuid);
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -070081
Harald Welte0de51082009-06-08 18:27:54 +080082 return cpu_has(cpu, X86_FEATURE_EST);
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -070083}
84
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -070085static unsigned extract_io(u32 value, struct acpi_cpufreq_data *data)
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -070086{
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -070087 struct acpi_processor_performance *perf;
88 int i;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -070089
90 perf = data->acpi_data;
91
Dave Jones3a58df32009-01-17 22:36:14 -050092 for (i = 0; i < perf->state_count; i++) {
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -070093 if (value == perf->states[i].status)
94 return data->freq_table[i].frequency;
95 }
96 return 0;
97}
98
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -070099static unsigned extract_msr(u32 msr, struct acpi_cpufreq_data *data)
100{
101 int i;
Venkatesh Pallipadia6f6e6e62006-10-03 12:37:42 -0700102 struct acpi_processor_performance *perf;
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700103
104 msr &= INTEL_MSR_RANGE;
Venkatesh Pallipadia6f6e6e62006-10-03 12:37:42 -0700105 perf = data->acpi_data;
106
Dave Jones3a58df32009-01-17 22:36:14 -0500107 for (i = 0; data->freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
Venkatesh Pallipadia6f6e6e62006-10-03 12:37:42 -0700108 if (msr == perf->states[data->freq_table[i].index].status)
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700109 return data->freq_table[i].frequency;
110 }
111 return data->freq_table[0].frequency;
112}
113
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700114static unsigned extract_freq(u32 val, struct acpi_cpufreq_data *data)
115{
116 switch (data->cpu_feature) {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700117 case SYSTEM_INTEL_MSR_CAPABLE:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700118 return extract_msr(val, data);
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700119 case SYSTEM_IO_CAPABLE:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700120 return extract_io(val, data);
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700121 default:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700122 return 0;
123 }
124}
125
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700126struct msr_addr {
127 u32 reg;
128};
129
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700130struct io_addr {
131 u16 port;
132 u8 bit_width;
133};
134
135struct drv_cmd {
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700136 unsigned int type;
Ingo Molnarbfa318a2009-01-15 15:46:08 +0100137 const struct cpumask *mask;
Dave Jones3a58df32009-01-17 22:36:14 -0500138 union {
139 struct msr_addr msr;
140 struct io_addr io;
141 } addr;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700142 u32 val;
143};
144
Andrew Morton01599fc2009-04-13 10:27:49 -0700145/* Called via smp_call_function_single(), on the target CPU */
146static void do_drv_read(void *_cmd)
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700147{
Mike Travis72859082009-01-16 15:31:15 -0800148 struct drv_cmd *cmd = _cmd;
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700149 u32 h;
150
151 switch (cmd->type) {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700152 case SYSTEM_INTEL_MSR_CAPABLE:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700153 rdmsr(cmd->addr.msr.reg, cmd->val, h);
154 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700155 case SYSTEM_IO_CAPABLE:
Venkatesh Pallipadi4e581ff2006-12-13 10:41:16 -0800156 acpi_os_read_port((acpi_io_address)cmd->addr.io.port,
157 &cmd->val,
158 (u32)cmd->addr.io.bit_width);
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700159 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700160 default:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700161 break;
162 }
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700163}
164
Andrew Morton01599fc2009-04-13 10:27:49 -0700165/* Called via smp_call_function_many(), on the target CPUs */
166static void do_drv_write(void *_cmd)
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700167{
Mike Travis72859082009-01-16 15:31:15 -0800168 struct drv_cmd *cmd = _cmd;
Venki Pallipadi13424f62007-05-23 15:42:13 -0700169 u32 lo, hi;
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700170
171 switch (cmd->type) {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700172 case SYSTEM_INTEL_MSR_CAPABLE:
Venki Pallipadi13424f62007-05-23 15:42:13 -0700173 rdmsr(cmd->addr.msr.reg, lo, hi);
174 lo = (lo & ~INTEL_MSR_RANGE) | (cmd->val & INTEL_MSR_RANGE);
175 wrmsr(cmd->addr.msr.reg, lo, hi);
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700176 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700177 case SYSTEM_IO_CAPABLE:
Venkatesh Pallipadi4e581ff2006-12-13 10:41:16 -0800178 acpi_os_write_port((acpi_io_address)cmd->addr.io.port,
179 cmd->val,
180 (u32)cmd->addr.io.bit_width);
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700181 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700182 default:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700183 break;
184 }
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700185}
186
Dave Jones95dd7222006-10-18 00:41:48 -0400187static void drv_read(struct drv_cmd *cmd)
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700188{
Andrew Morton4a283952009-12-21 16:19:58 -0800189 int err;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700190 cmd->val = 0;
191
Andrew Morton4a283952009-12-21 16:19:58 -0800192 err = smp_call_function_any(cmd->mask, do_drv_read, cmd, 1);
193 WARN_ON_ONCE(err); /* smp_call_function_any() was buggy? */
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700194}
195
196static void drv_write(struct drv_cmd *cmd)
197{
Linus Torvaldsea34f432009-04-15 08:05:13 -0700198 int this_cpu;
199
200 this_cpu = get_cpu();
201 if (cpumask_test_cpu(this_cpu, cmd->mask))
202 do_drv_write(cmd);
Andrew Morton01599fc2009-04-13 10:27:49 -0700203 smp_call_function_many(cmd->mask, do_drv_write, cmd, 1);
Linus Torvaldsea34f432009-04-15 08:05:13 -0700204 put_cpu();
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700205}
206
Mike Travis4d8bb532009-01-04 05:18:08 -0800207static u32 get_cur_val(const struct cpumask *mask)
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700208{
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700209 struct acpi_processor_performance *perf;
210 struct drv_cmd cmd;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700211
Mike Travis4d8bb532009-01-04 05:18:08 -0800212 if (unlikely(cpumask_empty(mask)))
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700213 return 0;
214
Tejun Heof1625062009-10-29 22:34:13 +0900215 switch (per_cpu(acfreq_data, cpumask_first(mask))->cpu_feature) {
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700216 case SYSTEM_INTEL_MSR_CAPABLE:
217 cmd.type = SYSTEM_INTEL_MSR_CAPABLE;
218 cmd.addr.msr.reg = MSR_IA32_PERF_STATUS;
219 break;
220 case SYSTEM_IO_CAPABLE:
221 cmd.type = SYSTEM_IO_CAPABLE;
Tejun Heof1625062009-10-29 22:34:13 +0900222 perf = per_cpu(acfreq_data, cpumask_first(mask))->acpi_data;
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700223 cmd.addr.io.port = perf->control_register.address;
224 cmd.addr.io.bit_width = perf->control_register.bit_width;
225 break;
226 default:
227 return 0;
228 }
229
Ingo Molnarbfa318a2009-01-15 15:46:08 +0100230 cmd.mask = mask;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700231 drv_read(&cmd);
232
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200233 pr_debug("get_cur_val = %u\n", cmd.val);
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700234
235 return cmd.val;
236}
237
238static unsigned int get_cur_freq_on_cpu(unsigned int cpu)
239{
Tejun Heof1625062009-10-29 22:34:13 +0900240 struct acpi_cpufreq_data *data = per_cpu(acfreq_data, cpu);
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700241 unsigned int freq;
Venkatesh Pallipadie56a7272008-04-28 15:13:43 -0400242 unsigned int cached_freq;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700243
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200244 pr_debug("get_cur_freq_on_cpu (%d)\n", cpu);
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700245
246 if (unlikely(data == NULL ||
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700247 data->acpi_data == NULL || data->freq_table == NULL)) {
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700248 return 0;
249 }
250
Venkatesh Pallipadie56a7272008-04-28 15:13:43 -0400251 cached_freq = data->freq_table[data->acpi_data->state].frequency;
Mike Travise39ad412009-01-04 05:18:10 -0800252 freq = extract_freq(get_cur_val(cpumask_of(cpu)), data);
Venkatesh Pallipadie56a7272008-04-28 15:13:43 -0400253 if (freq != cached_freq) {
254 /*
255 * The dreaded BIOS frequency change behind our back.
256 * Force set the frequency on next target call.
257 */
258 data->resume = 1;
259 }
260
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200261 pr_debug("cur freq = %u\n", freq);
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700262
263 return freq;
264}
265
Mike Travis72859082009-01-16 15:31:15 -0800266static unsigned int check_freqs(const struct cpumask *mask, unsigned int freq,
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700267 struct acpi_cpufreq_data *data)
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700268{
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700269 unsigned int cur_freq;
270 unsigned int i;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700271
Dave Jones3a58df32009-01-17 22:36:14 -0500272 for (i = 0; i < 100; i++) {
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700273 cur_freq = extract_freq(get_cur_val(mask), data);
274 if (cur_freq == freq)
275 return 1;
276 udelay(10);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 }
278 return 0;
279}
280
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700281static int acpi_cpufreq_target(struct cpufreq_policy *policy,
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700282 unsigned int target_freq, unsigned int relation)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283{
Tejun Heof1625062009-10-29 22:34:13 +0900284 struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700285 struct acpi_processor_performance *perf;
286 struct cpufreq_freqs freqs;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700287 struct drv_cmd cmd;
Venkatesh Pallipadi8edc59d92006-12-19 12:58:55 -0800288 unsigned int next_state = 0; /* Index into freq_table */
289 unsigned int next_perf_state = 0; /* Index into perf table */
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700290 unsigned int i;
291 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200293 pr_debug("acpi_cpufreq_target %d (%d)\n", target_freq, policy->cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700295 if (unlikely(data == NULL ||
Dave Jones95dd7222006-10-18 00:41:48 -0400296 data->acpi_data == NULL || data->freq_table == NULL)) {
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700297 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 }
299
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500300 perf = data->acpi_data;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700301 result = cpufreq_frequency_table_target(policy,
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700302 data->freq_table,
303 target_freq,
304 relation, &next_state);
Mike Travis4d8bb532009-01-04 05:18:08 -0800305 if (unlikely(result)) {
306 result = -ENODEV;
307 goto out;
308 }
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500309
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700310 next_perf_state = data->freq_table[next_state].index;
Venkatesh Pallipadi7650b282006-10-03 12:36:30 -0700311 if (perf->state == next_perf_state) {
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700312 if (unlikely(data->resume)) {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200313 pr_debug("Called after resume, resetting to P%d\n",
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700314 next_perf_state);
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700315 data->resume = 0;
316 } else {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200317 pr_debug("Already at target state (P%d)\n",
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700318 next_perf_state);
Mike Travis4d8bb532009-01-04 05:18:08 -0800319 goto out;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700320 }
321 }
322
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700323 switch (data->cpu_feature) {
324 case SYSTEM_INTEL_MSR_CAPABLE:
325 cmd.type = SYSTEM_INTEL_MSR_CAPABLE;
326 cmd.addr.msr.reg = MSR_IA32_PERF_CTL;
Venki Pallipadi13424f62007-05-23 15:42:13 -0700327 cmd.val = (u32) perf->states[next_perf_state].control;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700328 break;
329 case SYSTEM_IO_CAPABLE:
330 cmd.type = SYSTEM_IO_CAPABLE;
331 cmd.addr.io.port = perf->control_register.address;
332 cmd.addr.io.bit_width = perf->control_register.bit_width;
333 cmd.val = (u32) perf->states[next_perf_state].control;
334 break;
335 default:
Mike Travis4d8bb532009-01-04 05:18:08 -0800336 result = -ENODEV;
337 goto out;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700338 }
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700339
Mike Travis4d8bb532009-01-04 05:18:08 -0800340 /* cpufreq holds the hotplug lock, so we are safe from here on */
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700341 if (policy->shared_type != CPUFREQ_SHARED_TYPE_ANY)
Ingo Molnarbfa318a2009-01-15 15:46:08 +0100342 cmd.mask = policy->cpus;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700343 else
Ingo Molnarbfa318a2009-01-15 15:46:08 +0100344 cmd.mask = cpumask_of(policy->cpu);
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700345
Venkatesh Pallipadi8edc59d92006-12-19 12:58:55 -0800346 freqs.old = perf->states[perf->state].core_frequency * 1000;
347 freqs.new = data->freq_table[next_state].frequency;
Thomas Renninger6b72e392010-04-20 13:17:35 +0200348 for_each_cpu(i, policy->cpus) {
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700349 freqs.cpu = i;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500350 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
351 }
352
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700353 drv_write(&cmd);
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500354
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700355 if (acpi_pstate_strict) {
Mike Travis4d8bb532009-01-04 05:18:08 -0800356 if (!check_freqs(cmd.mask, freqs.new, data)) {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200357 pr_debug("acpi_cpufreq_target failed (%d)\n",
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700358 policy->cpu);
Mike Travis4d8bb532009-01-04 05:18:08 -0800359 result = -EAGAIN;
360 goto out;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500361 }
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500362 }
363
Thomas Renninger6b72e392010-04-20 13:17:35 +0200364 for_each_cpu(i, policy->cpus) {
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700365 freqs.cpu = i;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500366 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
367 }
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700368 perf->state = next_perf_state;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500369
Mike Travis4d8bb532009-01-04 05:18:08 -0800370out:
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700371 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372}
373
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700374static int acpi_cpufreq_verify(struct cpufreq_policy *policy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375{
Tejun Heof1625062009-10-29 22:34:13 +0900376 struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200378 pr_debug("acpi_cpufreq_verify\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700380 return cpufreq_frequency_table_verify(policy, data->freq_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381}
382
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383static unsigned long
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700384acpi_cpufreq_guess_freq(struct acpi_cpufreq_data *data, unsigned int cpu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385{
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700386 struct acpi_processor_performance *perf = data->acpi_data;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500387
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 if (cpu_khz) {
389 /* search the closest match to cpu_khz */
390 unsigned int i;
391 unsigned long freq;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500392 unsigned long freqn = perf->states[0].core_frequency * 1000;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
Dave Jones3a58df32009-01-17 22:36:14 -0500394 for (i = 0; i < (perf->state_count-1); i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 freq = freqn;
Dave Jones95dd7222006-10-18 00:41:48 -0400396 freqn = perf->states[i+1].core_frequency * 1000;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 if ((2 * cpu_khz) > (freqn + freq)) {
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500398 perf->state = i;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700399 return freq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 }
401 }
Dave Jones95dd7222006-10-18 00:41:48 -0400402 perf->state = perf->state_count-1;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700403 return freqn;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500404 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 /* assume CPU is at P0... */
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500406 perf->state = 0;
407 return perf->states[0].core_frequency * 1000;
408 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409}
410
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800411static void free_acpi_perf_data(void)
412{
413 unsigned int i;
414
415 /* Freeing a NULL pointer is OK, and alloc_percpu zeroes. */
416 for_each_possible_cpu(i)
417 free_cpumask_var(per_cpu_ptr(acpi_perf_data, i)
418 ->shared_cpu_map);
419 free_percpu(acpi_perf_data);
420}
421
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500422/*
423 * acpi_cpufreq_early_init - initialize ACPI P-States library
424 *
425 * Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c)
426 * in order to determine correct frequency and voltage pairings. We can
427 * do _PDC and _PSD and find out the processor dependency for the
428 * actual init that will happen later...
429 */
Fenghua Yu50109292007-08-07 18:40:30 -0400430static int __init acpi_cpufreq_early_init(void)
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500431{
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800432 unsigned int i;
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200433 pr_debug("acpi_cpufreq_early_init\n");
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500434
Fenghua Yu50109292007-08-07 18:40:30 -0400435 acpi_perf_data = alloc_percpu(struct acpi_processor_performance);
436 if (!acpi_perf_data) {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200437 pr_debug("Memory allocation error for acpi_perf_data.\n");
Fenghua Yu50109292007-08-07 18:40:30 -0400438 return -ENOMEM;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500439 }
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800440 for_each_possible_cpu(i) {
Yinghai Lueaa95842009-06-06 14:51:36 -0700441 if (!zalloc_cpumask_var_node(
Mike Travis80855f72008-12-31 18:08:47 -0800442 &per_cpu_ptr(acpi_perf_data, i)->shared_cpu_map,
443 GFP_KERNEL, cpu_to_node(i))) {
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800444
445 /* Freeing a NULL pointer is OK: alloc_percpu zeroes. */
446 free_acpi_perf_data();
447 return -ENOMEM;
448 }
449 }
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500450
451 /* Do initialization in ACPI core */
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700452 acpi_processor_preregister_performance(acpi_perf_data);
453 return 0;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500454}
455
Dave Jones95625b82006-10-21 01:37:39 -0400456#ifdef CONFIG_SMP
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700457/*
458 * Some BIOSes do SW_ANY coordination internally, either set it up in hw
459 * or do it in BIOS firmware and won't inform about it to OS. If not
460 * detected, this has a side effect of making CPU run at a different speed
461 * than OS intended it to run at. Detect it and handle it cleanly.
462 */
463static int bios_with_sw_any_bug;
464
Jeff Garzik18552562007-10-03 15:15:40 -0400465static int sw_any_bug_found(const struct dmi_system_id *d)
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700466{
467 bios_with_sw_any_bug = 1;
468 return 0;
469}
470
Jeff Garzik18552562007-10-03 15:15:40 -0400471static const struct dmi_system_id sw_any_bug_dmi_table[] = {
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700472 {
473 .callback = sw_any_bug_found,
474 .ident = "Supermicro Server X6DLP",
475 .matches = {
476 DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
477 DMI_MATCH(DMI_BIOS_VERSION, "080010"),
478 DMI_MATCH(DMI_PRODUCT_NAME, "X6DLP"),
479 },
480 },
481 { }
482};
Prarit Bhargava1a8e42f2009-08-26 13:19:37 -0400483
484static int acpi_cpufreq_blacklist(struct cpuinfo_x86 *c)
485{
John Villalovos293afe42009-09-25 13:30:08 -0400486 /* Intel Xeon Processor 7100 Series Specification Update
487 * http://www.intel.com/Assets/PDF/specupdate/314554.pdf
Prarit Bhargava1a8e42f2009-08-26 13:19:37 -0400488 * AL30: A Machine Check Exception (MCE) Occurring during an
489 * Enhanced Intel SpeedStep Technology Ratio Change May Cause
John Villalovos293afe42009-09-25 13:30:08 -0400490 * Both Processor Cores to Lock Up. */
Prarit Bhargava1a8e42f2009-08-26 13:19:37 -0400491 if (c->x86_vendor == X86_VENDOR_INTEL) {
492 if ((c->x86 == 15) &&
493 (c->x86_model == 6) &&
John Villalovos293afe42009-09-25 13:30:08 -0400494 (c->x86_mask == 8)) {
495 printk(KERN_INFO "acpi-cpufreq: Intel(R) "
496 "Xeon(R) 7100 Errata AL30, processors may "
497 "lock up on frequency changes: disabling "
498 "acpi-cpufreq.\n");
Prarit Bhargava1a8e42f2009-08-26 13:19:37 -0400499 return -ENODEV;
John Villalovos293afe42009-09-25 13:30:08 -0400500 }
Prarit Bhargava1a8e42f2009-08-26 13:19:37 -0400501 }
502 return 0;
503}
Dave Jones95625b82006-10-21 01:37:39 -0400504#endif
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700505
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700506static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507{
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700508 unsigned int i;
509 unsigned int valid_states = 0;
510 unsigned int cpu = policy->cpu;
511 struct acpi_cpufreq_data *data;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700512 unsigned int result = 0;
Mike Travis92cb7612007-10-19 20:35:04 +0200513 struct cpuinfo_x86 *c = &cpu_data(policy->cpu);
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700514 struct acpi_processor_performance *perf;
John Villalovos293afe42009-09-25 13:30:08 -0400515#ifdef CONFIG_SMP
516 static int blacklisted;
517#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200519 pr_debug("acpi_cpufreq_cpu_init\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520
Prarit Bhargava1a8e42f2009-08-26 13:19:37 -0400521#ifdef CONFIG_SMP
John Villalovos293afe42009-09-25 13:30:08 -0400522 if (blacklisted)
523 return blacklisted;
524 blacklisted = acpi_cpufreq_blacklist(c);
525 if (blacklisted)
526 return blacklisted;
Prarit Bhargava1a8e42f2009-08-26 13:19:37 -0400527#endif
528
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700529 data = kzalloc(sizeof(struct acpi_cpufreq_data), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 if (!data)
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700531 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532
Rusty Russellb36128c2009-02-20 16:29:08 +0900533 data->acpi_data = per_cpu_ptr(acpi_perf_data, cpu);
Tejun Heof1625062009-10-29 22:34:13 +0900534 per_cpu(acfreq_data, cpu) = data;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700535
Dave Jones95dd7222006-10-18 00:41:48 -0400536 if (cpu_has(c, X86_FEATURE_CONSTANT_TSC))
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700537 acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500539 result = acpi_processor_register_performance(data->acpi_data, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 if (result)
541 goto err_free;
542
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500543 perf = data->acpi_data;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500544 policy->shared_type = perf->shared_type;
Dave Jones95dd7222006-10-18 00:41:48 -0400545
Venkatesh Pallipadi46f18e32006-06-26 00:34:43 -0400546 /*
Dave Jones95dd7222006-10-18 00:41:48 -0400547 * Will let policy->cpus know about dependency only when software
Venkatesh Pallipadi46f18e32006-06-26 00:34:43 -0400548 * coordination is required.
549 */
550 if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL ||
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700551 policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) {
Rusty Russell835481d2009-01-04 05:18:06 -0800552 cpumask_copy(policy->cpus, perf->shared_cpu_map);
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700553 }
Rusty Russell835481d2009-01-04 05:18:06 -0800554 cpumask_copy(policy->related_cpus, perf->shared_cpu_map);
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700555
556#ifdef CONFIG_SMP
557 dmi_check_system(sw_any_bug_dmi_table);
Rusty Russell835481d2009-01-04 05:18:06 -0800558 if (bios_with_sw_any_bug && cpumask_weight(policy->cpus) == 1) {
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700559 policy->shared_type = CPUFREQ_SHARED_TYPE_ALL;
Rusty Russell835481d2009-01-04 05:18:06 -0800560 cpumask_copy(policy->cpus, cpu_core_mask(cpu));
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700561 }
562#endif
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500563
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 /* capability check */
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500565 if (perf->state_count <= 1) {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200566 pr_debug("No P-States\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 result = -ENODEV;
568 goto err_unreg;
569 }
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500570
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700571 if (perf->control_register.space_id != perf->status_register.space_id) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 result = -ENODEV;
573 goto err_unreg;
574 }
575
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700576 switch (perf->control_register.space_id) {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700577 case ACPI_ADR_SPACE_SYSTEM_IO:
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200578 pr_debug("SYSTEM IO addr space\n");
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700579 data->cpu_feature = SYSTEM_IO_CAPABLE;
580 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700581 case ACPI_ADR_SPACE_FIXED_HARDWARE:
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200582 pr_debug("HARDWARE addr space\n");
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700583 if (!check_est_cpu(cpu)) {
584 result = -ENODEV;
585 goto err_unreg;
586 }
587 data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700588 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700589 default:
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200590 pr_debug("Unknown addr space %d\n",
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700591 (u32) (perf->control_register.space_id));
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700592 result = -ENODEV;
593 goto err_unreg;
594 }
595
Dave Jones95dd7222006-10-18 00:41:48 -0400596 data->freq_table = kmalloc(sizeof(struct cpufreq_frequency_table) *
597 (perf->state_count+1), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 if (!data->freq_table) {
599 result = -ENOMEM;
600 goto err_unreg;
601 }
602
603 /* detect transition latency */
604 policy->cpuinfo.transition_latency = 0;
Dave Jones3a58df32009-01-17 22:36:14 -0500605 for (i = 0; i < perf->state_count; i++) {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700606 if ((perf->states[i].transition_latency * 1000) >
607 policy->cpuinfo.transition_latency)
608 policy->cpuinfo.transition_latency =
609 perf->states[i].transition_latency * 1000;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611
Pallipadi, Venkatesha59d1632009-03-19 14:41:40 -0700612 /* Check for high latency (>20uS) from buggy BIOSes, like on T42 */
613 if (perf->control_register.space_id == ACPI_ADR_SPACE_FIXED_HARDWARE &&
614 policy->cpuinfo.transition_latency > 20 * 1000) {
Pallipadi, Venkatesha59d1632009-03-19 14:41:40 -0700615 policy->cpuinfo.transition_latency = 20 * 1000;
Joe Perches61c8c672009-05-26 14:58:39 -0700616 printk_once(KERN_INFO
617 "P-state transition latency capped at 20 uS\n");
Pallipadi, Venkatesha59d1632009-03-19 14:41:40 -0700618 }
619
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 /* table init */
Dave Jones3a58df32009-01-17 22:36:14 -0500621 for (i = 0; i < perf->state_count; i++) {
622 if (i > 0 && perf->states[i].core_frequency >=
Zhang Rui3cdf5522007-06-13 21:24:02 -0400623 data->freq_table[valid_states-1].frequency / 1000)
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700624 continue;
625
626 data->freq_table[valid_states].index = i;
627 data->freq_table[valid_states].frequency =
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700628 perf->states[i].core_frequency * 1000;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700629 valid_states++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 }
Venkatesh Pallipadi3d4a7ef2006-11-13 17:47:44 -0800631 data->freq_table[valid_states].frequency = CPUFREQ_TABLE_END;
Venkatesh Pallipadi8edc59d92006-12-19 12:58:55 -0800632 perf->state = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633
634 result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table);
Dave Jones95dd7222006-10-18 00:41:48 -0400635 if (result)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 goto err_freqfree;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637
Thomas Renningerd876dfb2009-04-17 16:22:08 +0200638 if (perf->states[0].core_frequency * 1000 != policy->cpuinfo.max_freq)
639 printk(KERN_WARNING FW_WARN "P-state 0 is not max freq\n");
640
Mattia Dongilia507ac42006-12-15 19:52:45 +0100641 switch (perf->control_register.space_id) {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700642 case ACPI_ADR_SPACE_SYSTEM_IO:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700643 /* Current speed is unknown and not detectable by IO port */
644 policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu);
645 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700646 case ACPI_ADR_SPACE_FIXED_HARDWARE:
Venkatesh Pallipadi7650b282006-10-03 12:36:30 -0700647 acpi_cpufreq_driver.get = get_cur_freq_on_cpu;
Mattia Dongilia507ac42006-12-15 19:52:45 +0100648 policy->cur = get_cur_freq_on_cpu(cpu);
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700649 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700650 default:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700651 break;
652 }
653
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 /* notify BIOS that we exist */
655 acpi_processor_notify_smm(THIS_MODULE);
656
Venkatesh Pallipadidfde5d62006-10-03 12:38:45 -0700657 /* Check for APERF/MPERF support in hardware */
Peter Zijlstraa8303aa2009-09-02 10:56:56 +0200658 if (cpu_has(c, X86_FEATURE_APERFMPERF))
Mark Langsdorfa2fed572010-03-18 18:41:46 +0100659 acpi_cpufreq_driver.getavg = cpufreq_get_measured_perf;
Venkatesh Pallipadidfde5d62006-10-03 12:38:45 -0700660
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200661 pr_debug("CPU%u - ACPI performance management activated.\n", cpu);
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500662 for (i = 0; i < perf->state_count; i++)
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200663 pr_debug(" %cP%d: %d MHz, %d mW, %d uS\n",
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700664 (i == perf->state ? '*' : ' '), i,
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500665 (u32) perf->states[i].core_frequency,
666 (u32) perf->states[i].power,
667 (u32) perf->states[i].transition_latency);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668
669 cpufreq_frequency_table_get_attr(data->freq_table, policy->cpu);
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700670
Dominik Brodowski4b31e772005-05-18 13:49:00 -0400671 /*
672 * the first call to ->target() should result in us actually
673 * writing something to the appropriate registers.
674 */
675 data->resume = 1;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700676
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700677 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678
Dave Jones95dd7222006-10-18 00:41:48 -0400679err_freqfree:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680 kfree(data->freq_table);
Dave Jones95dd7222006-10-18 00:41:48 -0400681err_unreg:
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500682 acpi_processor_unregister_performance(perf, cpu);
Dave Jones95dd7222006-10-18 00:41:48 -0400683err_free:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 kfree(data);
Tejun Heof1625062009-10-29 22:34:13 +0900685 per_cpu(acfreq_data, cpu) = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700687 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688}
689
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700690static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691{
Tejun Heof1625062009-10-29 22:34:13 +0900692 struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200694 pr_debug("acpi_cpufreq_cpu_exit\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695
696 if (data) {
697 cpufreq_frequency_table_put_attr(policy->cpu);
Tejun Heof1625062009-10-29 22:34:13 +0900698 per_cpu(acfreq_data, policy->cpu) = NULL;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700699 acpi_processor_unregister_performance(data->acpi_data,
700 policy->cpu);
Zhang Ruidab5fff2010-10-12 09:09:37 +0800701 kfree(data->freq_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 kfree(data);
703 }
704
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700705 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706}
707
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700708static int acpi_cpufreq_resume(struct cpufreq_policy *policy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709{
Tejun Heof1625062009-10-29 22:34:13 +0900710 struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200712 pr_debug("acpi_cpufreq_resume\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713
714 data->resume = 1;
715
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700716 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717}
718
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700719static struct freq_attr *acpi_cpufreq_attr[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 &cpufreq_freq_attr_scaling_available_freqs,
721 NULL,
722};
723
724static struct cpufreq_driver acpi_cpufreq_driver = {
Thomas Renningere2f74f32009-11-19 12:31:01 +0100725 .verify = acpi_cpufreq_verify,
726 .target = acpi_cpufreq_target,
727 .bios_limit = acpi_processor_get_bios_limit,
728 .init = acpi_cpufreq_cpu_init,
729 .exit = acpi_cpufreq_cpu_exit,
730 .resume = acpi_cpufreq_resume,
731 .name = "acpi-cpufreq",
732 .owner = THIS_MODULE,
733 .attr = acpi_cpufreq_attr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734};
735
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700736static int __init acpi_cpufreq_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737{
Fenghua Yu50109292007-08-07 18:40:30 -0400738 int ret;
739
Yinghai Luee297532008-09-24 19:04:31 -0700740 if (acpi_disabled)
741 return 0;
742
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200743 pr_debug("acpi_cpufreq_init\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744
Fenghua Yu50109292007-08-07 18:40:30 -0400745 ret = acpi_cpufreq_early_init();
746 if (ret)
747 return ret;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500748
Akinobu Mita847aef62008-07-14 11:59:44 +0900749 ret = cpufreq_register_driver(&acpi_cpufreq_driver);
750 if (ret)
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800751 free_acpi_perf_data();
Akinobu Mita847aef62008-07-14 11:59:44 +0900752
753 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754}
755
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700756static void __exit acpi_cpufreq_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757{
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200758 pr_debug("acpi_cpufreq_exit\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759
760 cpufreq_unregister_driver(&acpi_cpufreq_driver);
761
Fenghua Yu50109292007-08-07 18:40:30 -0400762 free_percpu(acpi_perf_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763}
764
Venkatesh Pallipadid395bf12005-08-25 15:59:00 -0400765module_param(acpi_pstate_strict, uint, 0644);
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700766MODULE_PARM_DESC(acpi_pstate_strict,
Dave Jones95dd7222006-10-18 00:41:48 -0400767 "value 0 or non-zero. non-zero -> strict ACPI checks are "
768 "performed during frequency changes.");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769
770late_initcall(acpi_cpufreq_init);
771module_exit(acpi_cpufreq_exit);
772
773MODULE_ALIAS("acpi");