Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Dave Jones | 3a58df3 | 2009-01-17 22:36:14 -0500 | [diff] [blame] | 2 | * acpi-cpufreq.c - ACPI Processor P-States Driver |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> |
| 5 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> |
| 6 | * Copyright (C) 2002 - 2004 Dominik Brodowski <linux@brodo.de> |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 7 | * Copyright (C) 2006 Denis Sadykov <denis.m.sadykov@intel.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * |
| 9 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License as published by |
| 13 | * the Free Software Foundation; either version 2 of the License, or (at |
| 14 | * your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, but |
| 17 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 19 | * General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License along |
| 22 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 23 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
| 24 | * |
| 25 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 26 | */ |
| 27 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/kernel.h> |
| 29 | #include <linux/module.h> |
| 30 | #include <linux/init.h> |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 31 | #include <linux/smp.h> |
| 32 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <linux/cpufreq.h> |
Venkatesh Pallipadi | d395bf1 | 2005-08-25 15:59:00 -0400 | [diff] [blame] | 34 | #include <linux/compiler.h> |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 35 | #include <linux/dmi.h> |
Arjan van de Ven | 6161352 | 2009-09-17 16:11:28 +0200 | [diff] [blame] | 36 | #include <trace/events/power.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
| 38 | #include <linux/acpi.h> |
Dave Jones | 3a58df3 | 2009-01-17 22:36:14 -0500 | [diff] [blame] | 39 | #include <linux/io.h> |
| 40 | #include <linux/delay.h> |
| 41 | #include <linux/uaccess.h> |
| 42 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #include <acpi/processor.h> |
| 44 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 45 | #include <asm/msr.h> |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 46 | #include <asm/processor.h> |
| 47 | #include <asm/cpufeature.h> |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 48 | |
Dave Jones | 3a58df3 | 2009-01-17 22:36:14 -0500 | [diff] [blame] | 49 | #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, \ |
| 50 | "acpi-cpufreq", msg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
| 52 | MODULE_AUTHOR("Paul Diefenbaugh, Dominik Brodowski"); |
| 53 | MODULE_DESCRIPTION("ACPI Processor P-States Driver"); |
| 54 | MODULE_LICENSE("GPL"); |
| 55 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 56 | enum { |
| 57 | UNDEFINED_CAPABLE = 0, |
| 58 | SYSTEM_INTEL_MSR_CAPABLE, |
| 59 | SYSTEM_IO_CAPABLE, |
| 60 | }; |
| 61 | |
| 62 | #define INTEL_MSR_RANGE (0xffff) |
| 63 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 64 | struct acpi_cpufreq_data { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 65 | struct acpi_processor_performance *acpi_data; |
| 66 | struct cpufreq_frequency_table *freq_table; |
| 67 | unsigned int resume; |
| 68 | unsigned int cpu_feature; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | }; |
| 70 | |
Tejun Heo | f162506 | 2009-10-29 22:34:13 +0900 | [diff] [blame] | 71 | static DEFINE_PER_CPU(struct acpi_cpufreq_data *, acfreq_data); |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 72 | |
Tejun Heo | f162506 | 2009-10-29 22:34:13 +0900 | [diff] [blame] | 73 | static DEFINE_PER_CPU(struct aperfmperf, acfreq_old_perf); |
Pallipadi, Venkatesh | 093f13e | 2009-04-15 10:37:33 -0700 | [diff] [blame] | 74 | |
Fenghua Yu | 5010929 | 2007-08-07 18:40:30 -0400 | [diff] [blame] | 75 | /* acpi_perf_data is a pointer to percpu data. */ |
| 76 | static struct acpi_processor_performance *acpi_perf_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | |
| 78 | static struct cpufreq_driver acpi_cpufreq_driver; |
| 79 | |
Venkatesh Pallipadi | d395bf1 | 2005-08-25 15:59:00 -0400 | [diff] [blame] | 80 | static unsigned int acpi_pstate_strict; |
| 81 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 82 | static int check_est_cpu(unsigned int cpuid) |
| 83 | { |
Mike Travis | 92cb761 | 2007-10-19 20:35:04 +0200 | [diff] [blame] | 84 | struct cpuinfo_x86 *cpu = &cpu_data(cpuid); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 85 | |
Harald Welte | 0de5108 | 2009-06-08 18:27:54 +0800 | [diff] [blame] | 86 | return cpu_has(cpu, X86_FEATURE_EST); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 87 | } |
| 88 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 89 | static unsigned extract_io(u32 value, struct acpi_cpufreq_data *data) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 90 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 91 | struct acpi_processor_performance *perf; |
| 92 | int i; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 93 | |
| 94 | perf = data->acpi_data; |
| 95 | |
Dave Jones | 3a58df3 | 2009-01-17 22:36:14 -0500 | [diff] [blame] | 96 | for (i = 0; i < perf->state_count; i++) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 97 | if (value == perf->states[i].status) |
| 98 | return data->freq_table[i].frequency; |
| 99 | } |
| 100 | return 0; |
| 101 | } |
| 102 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 103 | static unsigned extract_msr(u32 msr, struct acpi_cpufreq_data *data) |
| 104 | { |
| 105 | int i; |
Venkatesh Pallipadi | a6f6e6e6 | 2006-10-03 12:37:42 -0700 | [diff] [blame] | 106 | struct acpi_processor_performance *perf; |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 107 | |
| 108 | msr &= INTEL_MSR_RANGE; |
Venkatesh Pallipadi | a6f6e6e6 | 2006-10-03 12:37:42 -0700 | [diff] [blame] | 109 | perf = data->acpi_data; |
| 110 | |
Dave Jones | 3a58df3 | 2009-01-17 22:36:14 -0500 | [diff] [blame] | 111 | for (i = 0; data->freq_table[i].frequency != CPUFREQ_TABLE_END; i++) { |
Venkatesh Pallipadi | a6f6e6e6 | 2006-10-03 12:37:42 -0700 | [diff] [blame] | 112 | if (msr == perf->states[data->freq_table[i].index].status) |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 113 | return data->freq_table[i].frequency; |
| 114 | } |
| 115 | return data->freq_table[0].frequency; |
| 116 | } |
| 117 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 118 | static unsigned extract_freq(u32 val, struct acpi_cpufreq_data *data) |
| 119 | { |
| 120 | switch (data->cpu_feature) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 121 | case SYSTEM_INTEL_MSR_CAPABLE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 122 | return extract_msr(val, data); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 123 | case SYSTEM_IO_CAPABLE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 124 | return extract_io(val, data); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 125 | default: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 126 | return 0; |
| 127 | } |
| 128 | } |
| 129 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 130 | struct msr_addr { |
| 131 | u32 reg; |
| 132 | }; |
| 133 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 134 | struct io_addr { |
| 135 | u16 port; |
| 136 | u8 bit_width; |
| 137 | }; |
| 138 | |
| 139 | struct drv_cmd { |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 140 | unsigned int type; |
Ingo Molnar | bfa318a | 2009-01-15 15:46:08 +0100 | [diff] [blame] | 141 | const struct cpumask *mask; |
Dave Jones | 3a58df3 | 2009-01-17 22:36:14 -0500 | [diff] [blame] | 142 | union { |
| 143 | struct msr_addr msr; |
| 144 | struct io_addr io; |
| 145 | } addr; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 146 | u32 val; |
| 147 | }; |
| 148 | |
Andrew Morton | 01599fc | 2009-04-13 10:27:49 -0700 | [diff] [blame] | 149 | /* Called via smp_call_function_single(), on the target CPU */ |
| 150 | static void do_drv_read(void *_cmd) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 151 | { |
Mike Travis | 7285908 | 2009-01-16 15:31:15 -0800 | [diff] [blame] | 152 | struct drv_cmd *cmd = _cmd; |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 153 | u32 h; |
| 154 | |
| 155 | switch (cmd->type) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 156 | case SYSTEM_INTEL_MSR_CAPABLE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 157 | rdmsr(cmd->addr.msr.reg, cmd->val, h); |
| 158 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 159 | case SYSTEM_IO_CAPABLE: |
Venkatesh Pallipadi | 4e581ff | 2006-12-13 10:41:16 -0800 | [diff] [blame] | 160 | acpi_os_read_port((acpi_io_address)cmd->addr.io.port, |
| 161 | &cmd->val, |
| 162 | (u32)cmd->addr.io.bit_width); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 163 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 164 | default: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 165 | break; |
| 166 | } |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 167 | } |
| 168 | |
Andrew Morton | 01599fc | 2009-04-13 10:27:49 -0700 | [diff] [blame] | 169 | /* Called via smp_call_function_many(), on the target CPUs */ |
| 170 | static void do_drv_write(void *_cmd) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 171 | { |
Mike Travis | 7285908 | 2009-01-16 15:31:15 -0800 | [diff] [blame] | 172 | struct drv_cmd *cmd = _cmd; |
Venki Pallipadi | 13424f6 | 2007-05-23 15:42:13 -0700 | [diff] [blame] | 173 | u32 lo, hi; |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 174 | |
| 175 | switch (cmd->type) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 176 | case SYSTEM_INTEL_MSR_CAPABLE: |
Venki Pallipadi | 13424f6 | 2007-05-23 15:42:13 -0700 | [diff] [blame] | 177 | rdmsr(cmd->addr.msr.reg, lo, hi); |
| 178 | lo = (lo & ~INTEL_MSR_RANGE) | (cmd->val & INTEL_MSR_RANGE); |
| 179 | wrmsr(cmd->addr.msr.reg, lo, hi); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 180 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 181 | case SYSTEM_IO_CAPABLE: |
Venkatesh Pallipadi | 4e581ff | 2006-12-13 10:41:16 -0800 | [diff] [blame] | 182 | acpi_os_write_port((acpi_io_address)cmd->addr.io.port, |
| 183 | cmd->val, |
| 184 | (u32)cmd->addr.io.bit_width); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 185 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 186 | default: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 187 | break; |
| 188 | } |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 189 | } |
| 190 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 191 | static void drv_read(struct drv_cmd *cmd) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 192 | { |
Andrew Morton | 4a28395 | 2009-12-21 16:19:58 -0800 | [diff] [blame^] | 193 | int err; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 194 | cmd->val = 0; |
| 195 | |
Andrew Morton | 4a28395 | 2009-12-21 16:19:58 -0800 | [diff] [blame^] | 196 | err = smp_call_function_any(cmd->mask, do_drv_read, cmd, 1); |
| 197 | WARN_ON_ONCE(err); /* smp_call_function_any() was buggy? */ |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 198 | } |
| 199 | |
| 200 | static void drv_write(struct drv_cmd *cmd) |
| 201 | { |
Linus Torvalds | ea34f43 | 2009-04-15 08:05:13 -0700 | [diff] [blame] | 202 | int this_cpu; |
| 203 | |
| 204 | this_cpu = get_cpu(); |
| 205 | if (cpumask_test_cpu(this_cpu, cmd->mask)) |
| 206 | do_drv_write(cmd); |
Andrew Morton | 01599fc | 2009-04-13 10:27:49 -0700 | [diff] [blame] | 207 | smp_call_function_many(cmd->mask, do_drv_write, cmd, 1); |
Linus Torvalds | ea34f43 | 2009-04-15 08:05:13 -0700 | [diff] [blame] | 208 | put_cpu(); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 209 | } |
| 210 | |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 211 | static u32 get_cur_val(const struct cpumask *mask) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 212 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 213 | struct acpi_processor_performance *perf; |
| 214 | struct drv_cmd cmd; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 215 | |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 216 | if (unlikely(cpumask_empty(mask))) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 217 | return 0; |
| 218 | |
Tejun Heo | f162506 | 2009-10-29 22:34:13 +0900 | [diff] [blame] | 219 | switch (per_cpu(acfreq_data, cpumask_first(mask))->cpu_feature) { |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 220 | case SYSTEM_INTEL_MSR_CAPABLE: |
| 221 | cmd.type = SYSTEM_INTEL_MSR_CAPABLE; |
| 222 | cmd.addr.msr.reg = MSR_IA32_PERF_STATUS; |
| 223 | break; |
| 224 | case SYSTEM_IO_CAPABLE: |
| 225 | cmd.type = SYSTEM_IO_CAPABLE; |
Tejun Heo | f162506 | 2009-10-29 22:34:13 +0900 | [diff] [blame] | 226 | perf = per_cpu(acfreq_data, cpumask_first(mask))->acpi_data; |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 227 | cmd.addr.io.port = perf->control_register.address; |
| 228 | cmd.addr.io.bit_width = perf->control_register.bit_width; |
| 229 | break; |
| 230 | default: |
| 231 | return 0; |
| 232 | } |
| 233 | |
Ingo Molnar | bfa318a | 2009-01-15 15:46:08 +0100 | [diff] [blame] | 234 | cmd.mask = mask; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 235 | drv_read(&cmd); |
| 236 | |
| 237 | dprintk("get_cur_val = %u\n", cmd.val); |
| 238 | |
| 239 | return cmd.val; |
| 240 | } |
| 241 | |
Andrew Morton | 01599fc | 2009-04-13 10:27:49 -0700 | [diff] [blame] | 242 | /* Called via smp_call_function_single(), on the target CPU */ |
| 243 | static void read_measured_perf_ctrs(void *_cur) |
Mike Travis | e39ad41 | 2009-01-04 05:18:10 -0800 | [diff] [blame] | 244 | { |
Peter Zijlstra | 5cbc19a | 2009-09-02 11:49:52 +0200 | [diff] [blame] | 245 | struct aperfmperf *am = _cur; |
Mike Travis | e39ad41 | 2009-01-04 05:18:10 -0800 | [diff] [blame] | 246 | |
Peter Zijlstra | 5cbc19a | 2009-09-02 11:49:52 +0200 | [diff] [blame] | 247 | get_aperfmperf(am); |
Mike Travis | e39ad41 | 2009-01-04 05:18:10 -0800 | [diff] [blame] | 248 | } |
| 249 | |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 250 | /* |
| 251 | * Return the measured active (C0) frequency on this CPU since last call |
| 252 | * to this function. |
| 253 | * Input: cpu number |
| 254 | * Return: Average CPU frequency in terms of max frequency (zero on error) |
| 255 | * |
| 256 | * We use IA32_MPERF and IA32_APERF MSRs to get the measured performance |
| 257 | * over a period of time, while CPU is in C0 state. |
| 258 | * IA32_MPERF counts at the rate of max advertised frequency |
| 259 | * IA32_APERF counts at the rate of actual CPU frequency |
| 260 | * Only IA32_APERF/IA32_MPERF ratio is architecturally defined and |
| 261 | * no meaning should be associated with absolute values of these MSRs. |
| 262 | */ |
venkatesh.pallipadi@intel.com | bf0b90e | 2008-08-04 11:59:07 -0700 | [diff] [blame] | 263 | static unsigned int get_measured_perf(struct cpufreq_policy *policy, |
| 264 | unsigned int cpu) |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 265 | { |
Peter Zijlstra | 5cbc19a | 2009-09-02 11:49:52 +0200 | [diff] [blame] | 266 | struct aperfmperf perf; |
| 267 | unsigned long ratio; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 268 | unsigned int retval; |
| 269 | |
Peter Zijlstra | 5cbc19a | 2009-09-02 11:49:52 +0200 | [diff] [blame] | 270 | if (smp_call_function_single(cpu, read_measured_perf_ctrs, &perf, 1)) |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 271 | return 0; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 272 | |
Tejun Heo | f162506 | 2009-10-29 22:34:13 +0900 | [diff] [blame] | 273 | ratio = calc_aperfmperf_ratio(&per_cpu(acfreq_old_perf, cpu), &perf); |
| 274 | per_cpu(acfreq_old_perf, cpu) = perf; |
Venkatesh Pallipadi | 18b2646 | 2009-04-06 11:26:08 -0700 | [diff] [blame] | 275 | |
Peter Zijlstra | 5cbc19a | 2009-09-02 11:49:52 +0200 | [diff] [blame] | 276 | retval = (policy->cpuinfo.max_freq * ratio) >> APERFMPERF_SHIFT; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 277 | |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 278 | return retval; |
| 279 | } |
| 280 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 281 | static unsigned int get_cur_freq_on_cpu(unsigned int cpu) |
| 282 | { |
Tejun Heo | f162506 | 2009-10-29 22:34:13 +0900 | [diff] [blame] | 283 | struct acpi_cpufreq_data *data = per_cpu(acfreq_data, cpu); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 284 | unsigned int freq; |
Venkatesh Pallipadi | e56a727 | 2008-04-28 15:13:43 -0400 | [diff] [blame] | 285 | unsigned int cached_freq; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 286 | |
| 287 | dprintk("get_cur_freq_on_cpu (%d)\n", cpu); |
| 288 | |
| 289 | if (unlikely(data == NULL || |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 290 | data->acpi_data == NULL || data->freq_table == NULL)) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 291 | return 0; |
| 292 | } |
| 293 | |
Venkatesh Pallipadi | e56a727 | 2008-04-28 15:13:43 -0400 | [diff] [blame] | 294 | cached_freq = data->freq_table[data->acpi_data->state].frequency; |
Mike Travis | e39ad41 | 2009-01-04 05:18:10 -0800 | [diff] [blame] | 295 | freq = extract_freq(get_cur_val(cpumask_of(cpu)), data); |
Venkatesh Pallipadi | e56a727 | 2008-04-28 15:13:43 -0400 | [diff] [blame] | 296 | if (freq != cached_freq) { |
| 297 | /* |
| 298 | * The dreaded BIOS frequency change behind our back. |
| 299 | * Force set the frequency on next target call. |
| 300 | */ |
| 301 | data->resume = 1; |
| 302 | } |
| 303 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 304 | dprintk("cur freq = %u\n", freq); |
| 305 | |
| 306 | return freq; |
| 307 | } |
| 308 | |
Mike Travis | 7285908 | 2009-01-16 15:31:15 -0800 | [diff] [blame] | 309 | static unsigned int check_freqs(const struct cpumask *mask, unsigned int freq, |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 310 | struct acpi_cpufreq_data *data) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 311 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 312 | unsigned int cur_freq; |
| 313 | unsigned int i; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 314 | |
Dave Jones | 3a58df3 | 2009-01-17 22:36:14 -0500 | [diff] [blame] | 315 | for (i = 0; i < 100; i++) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 316 | cur_freq = extract_freq(get_cur_val(mask), data); |
| 317 | if (cur_freq == freq) |
| 318 | return 1; |
| 319 | udelay(10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | } |
| 321 | return 0; |
| 322 | } |
| 323 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 324 | static int acpi_cpufreq_target(struct cpufreq_policy *policy, |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 325 | unsigned int target_freq, unsigned int relation) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | { |
Tejun Heo | f162506 | 2009-10-29 22:34:13 +0900 | [diff] [blame] | 327 | struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 328 | struct acpi_processor_performance *perf; |
| 329 | struct cpufreq_freqs freqs; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 330 | struct drv_cmd cmd; |
Venkatesh Pallipadi | 8edc59d9 | 2006-12-19 12:58:55 -0800 | [diff] [blame] | 331 | unsigned int next_state = 0; /* Index into freq_table */ |
| 332 | unsigned int next_perf_state = 0; /* Index into perf table */ |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 333 | unsigned int i; |
| 334 | int result = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 336 | dprintk("acpi_cpufreq_target %d (%d)\n", target_freq, policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 338 | if (unlikely(data == NULL || |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 339 | data->acpi_data == NULL || data->freq_table == NULL)) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 340 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | } |
| 342 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 343 | perf = data->acpi_data; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 344 | result = cpufreq_frequency_table_target(policy, |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 345 | data->freq_table, |
| 346 | target_freq, |
| 347 | relation, &next_state); |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 348 | if (unlikely(result)) { |
| 349 | result = -ENODEV; |
| 350 | goto out; |
| 351 | } |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 352 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 353 | next_perf_state = data->freq_table[next_state].index; |
Venkatesh Pallipadi | 7650b28 | 2006-10-03 12:36:30 -0700 | [diff] [blame] | 354 | if (perf->state == next_perf_state) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 355 | if (unlikely(data->resume)) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 356 | dprintk("Called after resume, resetting to P%d\n", |
| 357 | next_perf_state); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 358 | data->resume = 0; |
| 359 | } else { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 360 | dprintk("Already at target state (P%d)\n", |
| 361 | next_perf_state); |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 362 | goto out; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 363 | } |
| 364 | } |
| 365 | |
Arjan van de Ven | 6161352 | 2009-09-17 16:11:28 +0200 | [diff] [blame] | 366 | trace_power_frequency(POWER_PSTATE, data->freq_table[next_state].frequency); |
Arjan van de Ven | f3f47a6 | 2008-11-23 16:49:58 -0800 | [diff] [blame] | 367 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 368 | switch (data->cpu_feature) { |
| 369 | case SYSTEM_INTEL_MSR_CAPABLE: |
| 370 | cmd.type = SYSTEM_INTEL_MSR_CAPABLE; |
| 371 | cmd.addr.msr.reg = MSR_IA32_PERF_CTL; |
Venki Pallipadi | 13424f6 | 2007-05-23 15:42:13 -0700 | [diff] [blame] | 372 | cmd.val = (u32) perf->states[next_perf_state].control; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 373 | break; |
| 374 | case SYSTEM_IO_CAPABLE: |
| 375 | cmd.type = SYSTEM_IO_CAPABLE; |
| 376 | cmd.addr.io.port = perf->control_register.address; |
| 377 | cmd.addr.io.bit_width = perf->control_register.bit_width; |
| 378 | cmd.val = (u32) perf->states[next_perf_state].control; |
| 379 | break; |
| 380 | default: |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 381 | result = -ENODEV; |
| 382 | goto out; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 383 | } |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 384 | |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 385 | /* cpufreq holds the hotplug lock, so we are safe from here on */ |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 386 | if (policy->shared_type != CPUFREQ_SHARED_TYPE_ANY) |
Ingo Molnar | bfa318a | 2009-01-15 15:46:08 +0100 | [diff] [blame] | 387 | cmd.mask = policy->cpus; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 388 | else |
Ingo Molnar | bfa318a | 2009-01-15 15:46:08 +0100 | [diff] [blame] | 389 | cmd.mask = cpumask_of(policy->cpu); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 390 | |
Venkatesh Pallipadi | 8edc59d9 | 2006-12-19 12:58:55 -0800 | [diff] [blame] | 391 | freqs.old = perf->states[perf->state].core_frequency * 1000; |
| 392 | freqs.new = data->freq_table[next_state].frequency; |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 393 | for_each_cpu(i, cmd.mask) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 394 | freqs.cpu = i; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 395 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); |
| 396 | } |
| 397 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 398 | drv_write(&cmd); |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 399 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 400 | if (acpi_pstate_strict) { |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 401 | if (!check_freqs(cmd.mask, freqs.new, data)) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 402 | dprintk("acpi_cpufreq_target failed (%d)\n", |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 403 | policy->cpu); |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 404 | result = -EAGAIN; |
| 405 | goto out; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 406 | } |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 407 | } |
| 408 | |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 409 | for_each_cpu(i, cmd.mask) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 410 | freqs.cpu = i; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 411 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); |
| 412 | } |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 413 | perf->state = next_perf_state; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 414 | |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 415 | out: |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 416 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | } |
| 418 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 419 | static int acpi_cpufreq_verify(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | { |
Tejun Heo | f162506 | 2009-10-29 22:34:13 +0900 | [diff] [blame] | 421 | struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | |
| 423 | dprintk("acpi_cpufreq_verify\n"); |
| 424 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 425 | return cpufreq_frequency_table_verify(policy, data->freq_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | } |
| 427 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | static unsigned long |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 429 | acpi_cpufreq_guess_freq(struct acpi_cpufreq_data *data, unsigned int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 431 | struct acpi_processor_performance *perf = data->acpi_data; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 432 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | if (cpu_khz) { |
| 434 | /* search the closest match to cpu_khz */ |
| 435 | unsigned int i; |
| 436 | unsigned long freq; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 437 | unsigned long freqn = perf->states[0].core_frequency * 1000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | |
Dave Jones | 3a58df3 | 2009-01-17 22:36:14 -0500 | [diff] [blame] | 439 | for (i = 0; i < (perf->state_count-1); i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | freq = freqn; |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 441 | freqn = perf->states[i+1].core_frequency * 1000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | if ((2 * cpu_khz) > (freqn + freq)) { |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 443 | perf->state = i; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 444 | return freq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | } |
| 446 | } |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 447 | perf->state = perf->state_count-1; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 448 | return freqn; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 449 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | /* assume CPU is at P0... */ |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 451 | perf->state = 0; |
| 452 | return perf->states[0].core_frequency * 1000; |
| 453 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | } |
| 455 | |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 456 | static void free_acpi_perf_data(void) |
| 457 | { |
| 458 | unsigned int i; |
| 459 | |
| 460 | /* Freeing a NULL pointer is OK, and alloc_percpu zeroes. */ |
| 461 | for_each_possible_cpu(i) |
| 462 | free_cpumask_var(per_cpu_ptr(acpi_perf_data, i) |
| 463 | ->shared_cpu_map); |
| 464 | free_percpu(acpi_perf_data); |
| 465 | } |
| 466 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 467 | /* |
| 468 | * acpi_cpufreq_early_init - initialize ACPI P-States library |
| 469 | * |
| 470 | * Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c) |
| 471 | * in order to determine correct frequency and voltage pairings. We can |
| 472 | * do _PDC and _PSD and find out the processor dependency for the |
| 473 | * actual init that will happen later... |
| 474 | */ |
Fenghua Yu | 5010929 | 2007-08-07 18:40:30 -0400 | [diff] [blame] | 475 | static int __init acpi_cpufreq_early_init(void) |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 476 | { |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 477 | unsigned int i; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 478 | dprintk("acpi_cpufreq_early_init\n"); |
| 479 | |
Fenghua Yu | 5010929 | 2007-08-07 18:40:30 -0400 | [diff] [blame] | 480 | acpi_perf_data = alloc_percpu(struct acpi_processor_performance); |
| 481 | if (!acpi_perf_data) { |
| 482 | dprintk("Memory allocation error for acpi_perf_data.\n"); |
| 483 | return -ENOMEM; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 484 | } |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 485 | for_each_possible_cpu(i) { |
Yinghai Lu | eaa9584 | 2009-06-06 14:51:36 -0700 | [diff] [blame] | 486 | if (!zalloc_cpumask_var_node( |
Mike Travis | 80855f7 | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 487 | &per_cpu_ptr(acpi_perf_data, i)->shared_cpu_map, |
| 488 | GFP_KERNEL, cpu_to_node(i))) { |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 489 | |
| 490 | /* Freeing a NULL pointer is OK: alloc_percpu zeroes. */ |
| 491 | free_acpi_perf_data(); |
| 492 | return -ENOMEM; |
| 493 | } |
| 494 | } |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 495 | |
| 496 | /* Do initialization in ACPI core */ |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 497 | acpi_processor_preregister_performance(acpi_perf_data); |
| 498 | return 0; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 499 | } |
| 500 | |
Dave Jones | 95625b8 | 2006-10-21 01:37:39 -0400 | [diff] [blame] | 501 | #ifdef CONFIG_SMP |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 502 | /* |
| 503 | * Some BIOSes do SW_ANY coordination internally, either set it up in hw |
| 504 | * or do it in BIOS firmware and won't inform about it to OS. If not |
| 505 | * detected, this has a side effect of making CPU run at a different speed |
| 506 | * than OS intended it to run at. Detect it and handle it cleanly. |
| 507 | */ |
| 508 | static int bios_with_sw_any_bug; |
| 509 | |
Jeff Garzik | 1855256 | 2007-10-03 15:15:40 -0400 | [diff] [blame] | 510 | static int sw_any_bug_found(const struct dmi_system_id *d) |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 511 | { |
| 512 | bios_with_sw_any_bug = 1; |
| 513 | return 0; |
| 514 | } |
| 515 | |
Jeff Garzik | 1855256 | 2007-10-03 15:15:40 -0400 | [diff] [blame] | 516 | static const struct dmi_system_id sw_any_bug_dmi_table[] = { |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 517 | { |
| 518 | .callback = sw_any_bug_found, |
| 519 | .ident = "Supermicro Server X6DLP", |
| 520 | .matches = { |
| 521 | DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"), |
| 522 | DMI_MATCH(DMI_BIOS_VERSION, "080010"), |
| 523 | DMI_MATCH(DMI_PRODUCT_NAME, "X6DLP"), |
| 524 | }, |
| 525 | }, |
| 526 | { } |
| 527 | }; |
Prarit Bhargava | 1a8e42f | 2009-08-26 13:19:37 -0400 | [diff] [blame] | 528 | |
| 529 | static int acpi_cpufreq_blacklist(struct cpuinfo_x86 *c) |
| 530 | { |
John Villalovos | 293afe4 | 2009-09-25 13:30:08 -0400 | [diff] [blame] | 531 | /* Intel Xeon Processor 7100 Series Specification Update |
| 532 | * http://www.intel.com/Assets/PDF/specupdate/314554.pdf |
Prarit Bhargava | 1a8e42f | 2009-08-26 13:19:37 -0400 | [diff] [blame] | 533 | * AL30: A Machine Check Exception (MCE) Occurring during an |
| 534 | * Enhanced Intel SpeedStep Technology Ratio Change May Cause |
John Villalovos | 293afe4 | 2009-09-25 13:30:08 -0400 | [diff] [blame] | 535 | * Both Processor Cores to Lock Up. */ |
Prarit Bhargava | 1a8e42f | 2009-08-26 13:19:37 -0400 | [diff] [blame] | 536 | if (c->x86_vendor == X86_VENDOR_INTEL) { |
| 537 | if ((c->x86 == 15) && |
| 538 | (c->x86_model == 6) && |
John Villalovos | 293afe4 | 2009-09-25 13:30:08 -0400 | [diff] [blame] | 539 | (c->x86_mask == 8)) { |
| 540 | printk(KERN_INFO "acpi-cpufreq: Intel(R) " |
| 541 | "Xeon(R) 7100 Errata AL30, processors may " |
| 542 | "lock up on frequency changes: disabling " |
| 543 | "acpi-cpufreq.\n"); |
Prarit Bhargava | 1a8e42f | 2009-08-26 13:19:37 -0400 | [diff] [blame] | 544 | return -ENODEV; |
John Villalovos | 293afe4 | 2009-09-25 13:30:08 -0400 | [diff] [blame] | 545 | } |
Prarit Bhargava | 1a8e42f | 2009-08-26 13:19:37 -0400 | [diff] [blame] | 546 | } |
| 547 | return 0; |
| 548 | } |
Dave Jones | 95625b8 | 2006-10-21 01:37:39 -0400 | [diff] [blame] | 549 | #endif |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 550 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 551 | static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 553 | unsigned int i; |
| 554 | unsigned int valid_states = 0; |
| 555 | unsigned int cpu = policy->cpu; |
| 556 | struct acpi_cpufreq_data *data; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 557 | unsigned int result = 0; |
Mike Travis | 92cb761 | 2007-10-19 20:35:04 +0200 | [diff] [blame] | 558 | struct cpuinfo_x86 *c = &cpu_data(policy->cpu); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 559 | struct acpi_processor_performance *perf; |
John Villalovos | 293afe4 | 2009-09-25 13:30:08 -0400 | [diff] [blame] | 560 | #ifdef CONFIG_SMP |
| 561 | static int blacklisted; |
| 562 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | dprintk("acpi_cpufreq_cpu_init\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | |
Prarit Bhargava | 1a8e42f | 2009-08-26 13:19:37 -0400 | [diff] [blame] | 566 | #ifdef CONFIG_SMP |
John Villalovos | 293afe4 | 2009-09-25 13:30:08 -0400 | [diff] [blame] | 567 | if (blacklisted) |
| 568 | return blacklisted; |
| 569 | blacklisted = acpi_cpufreq_blacklist(c); |
| 570 | if (blacklisted) |
| 571 | return blacklisted; |
Prarit Bhargava | 1a8e42f | 2009-08-26 13:19:37 -0400 | [diff] [blame] | 572 | #endif |
| 573 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 574 | data = kzalloc(sizeof(struct acpi_cpufreq_data), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | if (!data) |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 576 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | |
Rusty Russell | b36128c | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 578 | data->acpi_data = per_cpu_ptr(acpi_perf_data, cpu); |
Tejun Heo | f162506 | 2009-10-29 22:34:13 +0900 | [diff] [blame] | 579 | per_cpu(acfreq_data, cpu) = data; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 580 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 581 | if (cpu_has(c, X86_FEATURE_CONSTANT_TSC)) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 582 | acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 584 | result = acpi_processor_register_performance(data->acpi_data, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | if (result) |
| 586 | goto err_free; |
| 587 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 588 | perf = data->acpi_data; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 589 | policy->shared_type = perf->shared_type; |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 590 | |
Venkatesh Pallipadi | 46f18e3 | 2006-06-26 00:34:43 -0400 | [diff] [blame] | 591 | /* |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 592 | * Will let policy->cpus know about dependency only when software |
Venkatesh Pallipadi | 46f18e3 | 2006-06-26 00:34:43 -0400 | [diff] [blame] | 593 | * coordination is required. |
| 594 | */ |
| 595 | if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL || |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 596 | policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) { |
Rusty Russell | 835481d | 2009-01-04 05:18:06 -0800 | [diff] [blame] | 597 | cpumask_copy(policy->cpus, perf->shared_cpu_map); |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 598 | } |
Rusty Russell | 835481d | 2009-01-04 05:18:06 -0800 | [diff] [blame] | 599 | cpumask_copy(policy->related_cpus, perf->shared_cpu_map); |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 600 | |
| 601 | #ifdef CONFIG_SMP |
| 602 | dmi_check_system(sw_any_bug_dmi_table); |
Rusty Russell | 835481d | 2009-01-04 05:18:06 -0800 | [diff] [blame] | 603 | if (bios_with_sw_any_bug && cpumask_weight(policy->cpus) == 1) { |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 604 | policy->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
Rusty Russell | 835481d | 2009-01-04 05:18:06 -0800 | [diff] [blame] | 605 | cpumask_copy(policy->cpus, cpu_core_mask(cpu)); |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 606 | } |
| 607 | #endif |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 608 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | /* capability check */ |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 610 | if (perf->state_count <= 1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | dprintk("No P-States\n"); |
| 612 | result = -ENODEV; |
| 613 | goto err_unreg; |
| 614 | } |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 615 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 616 | if (perf->control_register.space_id != perf->status_register.space_id) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | result = -ENODEV; |
| 618 | goto err_unreg; |
| 619 | } |
| 620 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 621 | switch (perf->control_register.space_id) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 622 | case ACPI_ADR_SPACE_SYSTEM_IO: |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 623 | dprintk("SYSTEM IO addr space\n"); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 624 | data->cpu_feature = SYSTEM_IO_CAPABLE; |
| 625 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 626 | case ACPI_ADR_SPACE_FIXED_HARDWARE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 627 | dprintk("HARDWARE addr space\n"); |
| 628 | if (!check_est_cpu(cpu)) { |
| 629 | result = -ENODEV; |
| 630 | goto err_unreg; |
| 631 | } |
| 632 | data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 633 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 634 | default: |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 635 | dprintk("Unknown addr space %d\n", |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 636 | (u32) (perf->control_register.space_id)); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 637 | result = -ENODEV; |
| 638 | goto err_unreg; |
| 639 | } |
| 640 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 641 | data->freq_table = kmalloc(sizeof(struct cpufreq_frequency_table) * |
| 642 | (perf->state_count+1), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | if (!data->freq_table) { |
| 644 | result = -ENOMEM; |
| 645 | goto err_unreg; |
| 646 | } |
| 647 | |
| 648 | /* detect transition latency */ |
| 649 | policy->cpuinfo.transition_latency = 0; |
Dave Jones | 3a58df3 | 2009-01-17 22:36:14 -0500 | [diff] [blame] | 650 | for (i = 0; i < perf->state_count; i++) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 651 | if ((perf->states[i].transition_latency * 1000) > |
| 652 | policy->cpuinfo.transition_latency) |
| 653 | policy->cpuinfo.transition_latency = |
| 654 | perf->states[i].transition_latency * 1000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | |
Pallipadi, Venkatesh | a59d163 | 2009-03-19 14:41:40 -0700 | [diff] [blame] | 657 | /* Check for high latency (>20uS) from buggy BIOSes, like on T42 */ |
| 658 | if (perf->control_register.space_id == ACPI_ADR_SPACE_FIXED_HARDWARE && |
| 659 | policy->cpuinfo.transition_latency > 20 * 1000) { |
Pallipadi, Venkatesh | a59d163 | 2009-03-19 14:41:40 -0700 | [diff] [blame] | 660 | policy->cpuinfo.transition_latency = 20 * 1000; |
Joe Perches | 61c8c67 | 2009-05-26 14:58:39 -0700 | [diff] [blame] | 661 | printk_once(KERN_INFO |
| 662 | "P-state transition latency capped at 20 uS\n"); |
Pallipadi, Venkatesh | a59d163 | 2009-03-19 14:41:40 -0700 | [diff] [blame] | 663 | } |
| 664 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | /* table init */ |
Dave Jones | 3a58df3 | 2009-01-17 22:36:14 -0500 | [diff] [blame] | 666 | for (i = 0; i < perf->state_count; i++) { |
| 667 | if (i > 0 && perf->states[i].core_frequency >= |
Zhang Rui | 3cdf552 | 2007-06-13 21:24:02 -0400 | [diff] [blame] | 668 | data->freq_table[valid_states-1].frequency / 1000) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 669 | continue; |
| 670 | |
| 671 | data->freq_table[valid_states].index = i; |
| 672 | data->freq_table[valid_states].frequency = |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 673 | perf->states[i].core_frequency * 1000; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 674 | valid_states++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | } |
Venkatesh Pallipadi | 3d4a7ef | 2006-11-13 17:47:44 -0800 | [diff] [blame] | 676 | data->freq_table[valid_states].frequency = CPUFREQ_TABLE_END; |
Venkatesh Pallipadi | 8edc59d9 | 2006-12-19 12:58:55 -0800 | [diff] [blame] | 677 | perf->state = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | |
| 679 | result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table); |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 680 | if (result) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | goto err_freqfree; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | |
Thomas Renninger | d876dfb | 2009-04-17 16:22:08 +0200 | [diff] [blame] | 683 | if (perf->states[0].core_frequency * 1000 != policy->cpuinfo.max_freq) |
| 684 | printk(KERN_WARNING FW_WARN "P-state 0 is not max freq\n"); |
| 685 | |
Mattia Dongili | a507ac4 | 2006-12-15 19:52:45 +0100 | [diff] [blame] | 686 | switch (perf->control_register.space_id) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 687 | case ACPI_ADR_SPACE_SYSTEM_IO: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 688 | /* Current speed is unknown and not detectable by IO port */ |
| 689 | policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu); |
| 690 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 691 | case ACPI_ADR_SPACE_FIXED_HARDWARE: |
Venkatesh Pallipadi | 7650b28 | 2006-10-03 12:36:30 -0700 | [diff] [blame] | 692 | acpi_cpufreq_driver.get = get_cur_freq_on_cpu; |
Mattia Dongili | a507ac4 | 2006-12-15 19:52:45 +0100 | [diff] [blame] | 693 | policy->cur = get_cur_freq_on_cpu(cpu); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 694 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 695 | default: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 696 | break; |
| 697 | } |
| 698 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | /* notify BIOS that we exist */ |
| 700 | acpi_processor_notify_smm(THIS_MODULE); |
| 701 | |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 702 | /* Check for APERF/MPERF support in hardware */ |
Peter Zijlstra | a8303aa | 2009-09-02 10:56:56 +0200 | [diff] [blame] | 703 | if (cpu_has(c, X86_FEATURE_APERFMPERF)) |
| 704 | acpi_cpufreq_driver.getavg = get_measured_perf; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 705 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 706 | dprintk("CPU%u - ACPI performance management activated.\n", cpu); |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 707 | for (i = 0; i < perf->state_count; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | dprintk(" %cP%d: %d MHz, %d mW, %d uS\n", |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 709 | (i == perf->state ? '*' : ' '), i, |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 710 | (u32) perf->states[i].core_frequency, |
| 711 | (u32) perf->states[i].power, |
| 712 | (u32) perf->states[i].transition_latency); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | |
| 714 | cpufreq_frequency_table_get_attr(data->freq_table, policy->cpu); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 715 | |
Dominik Brodowski | 4b31e77 | 2005-05-18 13:49:00 -0400 | [diff] [blame] | 716 | /* |
| 717 | * the first call to ->target() should result in us actually |
| 718 | * writing something to the appropriate registers. |
| 719 | */ |
| 720 | data->resume = 1; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 721 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 722 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 724 | err_freqfree: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | kfree(data->freq_table); |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 726 | err_unreg: |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 727 | acpi_processor_unregister_performance(perf, cpu); |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 728 | err_free: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | kfree(data); |
Tejun Heo | f162506 | 2009-10-29 22:34:13 +0900 | [diff] [blame] | 730 | per_cpu(acfreq_data, cpu) = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 732 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | } |
| 734 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 735 | static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | { |
Tejun Heo | f162506 | 2009-10-29 22:34:13 +0900 | [diff] [blame] | 737 | struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | dprintk("acpi_cpufreq_cpu_exit\n"); |
| 740 | |
| 741 | if (data) { |
| 742 | cpufreq_frequency_table_put_attr(policy->cpu); |
Tejun Heo | f162506 | 2009-10-29 22:34:13 +0900 | [diff] [blame] | 743 | per_cpu(acfreq_data, policy->cpu) = NULL; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 744 | acpi_processor_unregister_performance(data->acpi_data, |
| 745 | policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | kfree(data); |
| 747 | } |
| 748 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 749 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | } |
| 751 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 752 | static int acpi_cpufreq_resume(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | { |
Tejun Heo | f162506 | 2009-10-29 22:34:13 +0900 | [diff] [blame] | 754 | struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | dprintk("acpi_cpufreq_resume\n"); |
| 757 | |
| 758 | data->resume = 1; |
| 759 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 760 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | } |
| 762 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 763 | static struct freq_attr *acpi_cpufreq_attr[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | &cpufreq_freq_attr_scaling_available_freqs, |
| 765 | NULL, |
| 766 | }; |
| 767 | |
| 768 | static struct cpufreq_driver acpi_cpufreq_driver = { |
Thomas Renninger | e2f74f3 | 2009-11-19 12:31:01 +0100 | [diff] [blame] | 769 | .verify = acpi_cpufreq_verify, |
| 770 | .target = acpi_cpufreq_target, |
| 771 | .bios_limit = acpi_processor_get_bios_limit, |
| 772 | .init = acpi_cpufreq_cpu_init, |
| 773 | .exit = acpi_cpufreq_cpu_exit, |
| 774 | .resume = acpi_cpufreq_resume, |
| 775 | .name = "acpi-cpufreq", |
| 776 | .owner = THIS_MODULE, |
| 777 | .attr = acpi_cpufreq_attr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | }; |
| 779 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 780 | static int __init acpi_cpufreq_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | { |
Fenghua Yu | 5010929 | 2007-08-07 18:40:30 -0400 | [diff] [blame] | 782 | int ret; |
| 783 | |
Yinghai Lu | ee29753 | 2008-09-24 19:04:31 -0700 | [diff] [blame] | 784 | if (acpi_disabled) |
| 785 | return 0; |
| 786 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | dprintk("acpi_cpufreq_init\n"); |
| 788 | |
Fenghua Yu | 5010929 | 2007-08-07 18:40:30 -0400 | [diff] [blame] | 789 | ret = acpi_cpufreq_early_init(); |
| 790 | if (ret) |
| 791 | return ret; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 792 | |
Akinobu Mita | 847aef6 | 2008-07-14 11:59:44 +0900 | [diff] [blame] | 793 | ret = cpufreq_register_driver(&acpi_cpufreq_driver); |
| 794 | if (ret) |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 795 | free_acpi_perf_data(); |
Akinobu Mita | 847aef6 | 2008-07-14 11:59:44 +0900 | [diff] [blame] | 796 | |
| 797 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | } |
| 799 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 800 | static void __exit acpi_cpufreq_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | { |
| 802 | dprintk("acpi_cpufreq_exit\n"); |
| 803 | |
| 804 | cpufreq_unregister_driver(&acpi_cpufreq_driver); |
| 805 | |
Fenghua Yu | 5010929 | 2007-08-07 18:40:30 -0400 | [diff] [blame] | 806 | free_percpu(acpi_perf_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | } |
| 808 | |
Venkatesh Pallipadi | d395bf1 | 2005-08-25 15:59:00 -0400 | [diff] [blame] | 809 | module_param(acpi_pstate_strict, uint, 0644); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 810 | MODULE_PARM_DESC(acpi_pstate_strict, |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 811 | "value 0 or non-zero. non-zero -> strict ACPI checks are " |
| 812 | "performed during frequency changes."); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | |
| 814 | late_initcall(acpi_cpufreq_init); |
| 815 | module_exit(acpi_cpufreq_exit); |
| 816 | |
| 817 | MODULE_ALIAS("acpi"); |