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> |
Frederic Weisbecker | 1292211 | 2009-02-07 22:16:12 +0100 | [diff] [blame] | 36 | #include <trace/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) |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 63 | #define CPUID_6_ECX_APERFMPERF_CAPABILITY (0x1) |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 64 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 65 | struct acpi_cpufreq_data { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 66 | struct acpi_processor_performance *acpi_data; |
| 67 | struct cpufreq_frequency_table *freq_table; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 68 | unsigned int max_freq; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 69 | unsigned int resume; |
| 70 | unsigned int cpu_feature; |
Venkatesh Pallipadi | 18b2646 | 2009-04-06 11:26:08 -0700 | [diff] [blame] | 71 | u64 saved_aperf, saved_mperf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | }; |
| 73 | |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 74 | static DEFINE_PER_CPU(struct acpi_cpufreq_data *, drv_data); |
| 75 | |
Jason Baron | b5f9fd0 | 2009-02-11 13:57:25 -0500 | [diff] [blame] | 76 | DEFINE_TRACE(power_mark); |
| 77 | |
Fenghua Yu | 5010929 | 2007-08-07 18:40:30 -0400 | [diff] [blame] | 78 | /* acpi_perf_data is a pointer to percpu data. */ |
| 79 | static struct acpi_processor_performance *acpi_perf_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | |
| 81 | static struct cpufreq_driver acpi_cpufreq_driver; |
| 82 | |
Venkatesh Pallipadi | d395bf1 | 2005-08-25 15:59:00 -0400 | [diff] [blame] | 83 | static unsigned int acpi_pstate_strict; |
| 84 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 85 | static int check_est_cpu(unsigned int cpuid) |
| 86 | { |
Mike Travis | 92cb761 | 2007-10-19 20:35:04 +0200 | [diff] [blame] | 87 | struct cpuinfo_x86 *cpu = &cpu_data(cpuid); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 88 | |
| 89 | if (cpu->x86_vendor != X86_VENDOR_INTEL || |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 90 | !cpu_has(cpu, X86_FEATURE_EST)) |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 91 | return 0; |
| 92 | |
| 93 | return 1; |
| 94 | } |
| 95 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 96 | static unsigned extract_io(u32 value, struct acpi_cpufreq_data *data) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 97 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 98 | struct acpi_processor_performance *perf; |
| 99 | int i; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 100 | |
| 101 | perf = data->acpi_data; |
| 102 | |
Dave Jones | 3a58df3 | 2009-01-17 22:36:14 -0500 | [diff] [blame] | 103 | for (i = 0; i < perf->state_count; i++) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 104 | if (value == perf->states[i].status) |
| 105 | return data->freq_table[i].frequency; |
| 106 | } |
| 107 | return 0; |
| 108 | } |
| 109 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 110 | static unsigned extract_msr(u32 msr, struct acpi_cpufreq_data *data) |
| 111 | { |
| 112 | int i; |
Venkatesh Pallipadi | a6f6e6e6 | 2006-10-03 12:37:42 -0700 | [diff] [blame] | 113 | struct acpi_processor_performance *perf; |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 114 | |
| 115 | msr &= INTEL_MSR_RANGE; |
Venkatesh Pallipadi | a6f6e6e6 | 2006-10-03 12:37:42 -0700 | [diff] [blame] | 116 | perf = data->acpi_data; |
| 117 | |
Dave Jones | 3a58df3 | 2009-01-17 22:36:14 -0500 | [diff] [blame] | 118 | for (i = 0; data->freq_table[i].frequency != CPUFREQ_TABLE_END; i++) { |
Venkatesh Pallipadi | a6f6e6e6 | 2006-10-03 12:37:42 -0700 | [diff] [blame] | 119 | if (msr == perf->states[data->freq_table[i].index].status) |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 120 | return data->freq_table[i].frequency; |
| 121 | } |
| 122 | return data->freq_table[0].frequency; |
| 123 | } |
| 124 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 125 | static unsigned extract_freq(u32 val, struct acpi_cpufreq_data *data) |
| 126 | { |
| 127 | switch (data->cpu_feature) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 128 | case SYSTEM_INTEL_MSR_CAPABLE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 129 | return extract_msr(val, data); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 130 | case SYSTEM_IO_CAPABLE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 131 | return extract_io(val, data); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 132 | default: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 133 | return 0; |
| 134 | } |
| 135 | } |
| 136 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 137 | struct msr_addr { |
| 138 | u32 reg; |
| 139 | }; |
| 140 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 141 | struct io_addr { |
| 142 | u16 port; |
| 143 | u8 bit_width; |
| 144 | }; |
| 145 | |
| 146 | struct drv_cmd { |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 147 | unsigned int type; |
Ingo Molnar | bfa318a | 2009-01-15 15:46:08 +0100 | [diff] [blame] | 148 | const struct cpumask *mask; |
Dave Jones | 3a58df3 | 2009-01-17 22:36:14 -0500 | [diff] [blame] | 149 | union { |
| 150 | struct msr_addr msr; |
| 151 | struct io_addr io; |
| 152 | } addr; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 153 | u32 val; |
| 154 | }; |
| 155 | |
Andrew Morton | 01599fc | 2009-04-13 10:27:49 -0700 | [diff] [blame^] | 156 | /* Called via smp_call_function_single(), on the target CPU */ |
| 157 | static void do_drv_read(void *_cmd) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 158 | { |
Mike Travis | 7285908 | 2009-01-16 15:31:15 -0800 | [diff] [blame] | 159 | struct drv_cmd *cmd = _cmd; |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 160 | u32 h; |
| 161 | |
| 162 | switch (cmd->type) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 163 | case SYSTEM_INTEL_MSR_CAPABLE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 164 | rdmsr(cmd->addr.msr.reg, cmd->val, h); |
| 165 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 166 | case SYSTEM_IO_CAPABLE: |
Venkatesh Pallipadi | 4e581ff | 2006-12-13 10:41:16 -0800 | [diff] [blame] | 167 | acpi_os_read_port((acpi_io_address)cmd->addr.io.port, |
| 168 | &cmd->val, |
| 169 | (u32)cmd->addr.io.bit_width); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 170 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 171 | default: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 172 | break; |
| 173 | } |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 174 | } |
| 175 | |
Andrew Morton | 01599fc | 2009-04-13 10:27:49 -0700 | [diff] [blame^] | 176 | /* Called via smp_call_function_many(), on the target CPUs */ |
| 177 | static void do_drv_write(void *_cmd) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 178 | { |
Mike Travis | 7285908 | 2009-01-16 15:31:15 -0800 | [diff] [blame] | 179 | struct drv_cmd *cmd = _cmd; |
Venki Pallipadi | 13424f6 | 2007-05-23 15:42:13 -0700 | [diff] [blame] | 180 | u32 lo, hi; |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 181 | |
| 182 | switch (cmd->type) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 183 | case SYSTEM_INTEL_MSR_CAPABLE: |
Venki Pallipadi | 13424f6 | 2007-05-23 15:42:13 -0700 | [diff] [blame] | 184 | rdmsr(cmd->addr.msr.reg, lo, hi); |
| 185 | lo = (lo & ~INTEL_MSR_RANGE) | (cmd->val & INTEL_MSR_RANGE); |
| 186 | wrmsr(cmd->addr.msr.reg, lo, hi); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 187 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 188 | case SYSTEM_IO_CAPABLE: |
Venkatesh Pallipadi | 4e581ff | 2006-12-13 10:41:16 -0800 | [diff] [blame] | 189 | acpi_os_write_port((acpi_io_address)cmd->addr.io.port, |
| 190 | cmd->val, |
| 191 | (u32)cmd->addr.io.bit_width); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 192 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 193 | default: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 194 | break; |
| 195 | } |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 196 | } |
| 197 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 198 | static void drv_read(struct drv_cmd *cmd) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 199 | { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 200 | cmd->val = 0; |
| 201 | |
Andrew Morton | 01599fc | 2009-04-13 10:27:49 -0700 | [diff] [blame^] | 202 | smp_call_function_single(cpumask_any(cmd->mask), do_drv_read, cmd, 1); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 203 | } |
| 204 | |
| 205 | static void drv_write(struct drv_cmd *cmd) |
| 206 | { |
Andrew Morton | 01599fc | 2009-04-13 10:27:49 -0700 | [diff] [blame^] | 207 | smp_call_function_many(cmd->mask, do_drv_write, cmd, 1); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 208 | } |
| 209 | |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 210 | static u32 get_cur_val(const struct cpumask *mask) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 211 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 212 | struct acpi_processor_performance *perf; |
| 213 | struct drv_cmd cmd; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 214 | |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 215 | if (unlikely(cpumask_empty(mask))) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 216 | return 0; |
| 217 | |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 218 | switch (per_cpu(drv_data, cpumask_first(mask))->cpu_feature) { |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 219 | case SYSTEM_INTEL_MSR_CAPABLE: |
| 220 | cmd.type = SYSTEM_INTEL_MSR_CAPABLE; |
| 221 | cmd.addr.msr.reg = MSR_IA32_PERF_STATUS; |
| 222 | break; |
| 223 | case SYSTEM_IO_CAPABLE: |
| 224 | cmd.type = SYSTEM_IO_CAPABLE; |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 225 | perf = per_cpu(drv_data, cpumask_first(mask))->acpi_data; |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 226 | cmd.addr.io.port = perf->control_register.address; |
| 227 | cmd.addr.io.bit_width = perf->control_register.bit_width; |
| 228 | break; |
| 229 | default: |
| 230 | return 0; |
| 231 | } |
| 232 | |
Ingo Molnar | bfa318a | 2009-01-15 15:46:08 +0100 | [diff] [blame] | 233 | cmd.mask = mask; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 234 | drv_read(&cmd); |
| 235 | |
| 236 | dprintk("get_cur_val = %u\n", cmd.val); |
| 237 | |
| 238 | return cmd.val; |
| 239 | } |
| 240 | |
Venkatesh Pallipadi | e4f6937 | 2009-04-06 11:26:07 -0700 | [diff] [blame] | 241 | struct perf_pair { |
Mike Travis | e39ad41 | 2009-01-04 05:18:10 -0800 | [diff] [blame] | 242 | union { |
| 243 | struct { |
| 244 | u32 lo; |
| 245 | u32 hi; |
| 246 | } split; |
| 247 | u64 whole; |
Venkatesh Pallipadi | e4f6937 | 2009-04-06 11:26:07 -0700 | [diff] [blame] | 248 | } aperf, mperf; |
Mike Travis | e39ad41 | 2009-01-04 05:18:10 -0800 | [diff] [blame] | 249 | }; |
| 250 | |
Andrew Morton | 01599fc | 2009-04-13 10:27:49 -0700 | [diff] [blame^] | 251 | /* Called via smp_call_function_single(), on the target CPU */ |
| 252 | static void read_measured_perf_ctrs(void *_cur) |
Mike Travis | e39ad41 | 2009-01-04 05:18:10 -0800 | [diff] [blame] | 253 | { |
Venkatesh Pallipadi | e4f6937 | 2009-04-06 11:26:07 -0700 | [diff] [blame] | 254 | struct perf_pair *cur = _cur; |
Mike Travis | e39ad41 | 2009-01-04 05:18:10 -0800 | [diff] [blame] | 255 | |
Venkatesh Pallipadi | e4f6937 | 2009-04-06 11:26:07 -0700 | [diff] [blame] | 256 | rdmsr(MSR_IA32_APERF, cur->aperf.split.lo, cur->aperf.split.hi); |
| 257 | rdmsr(MSR_IA32_MPERF, cur->mperf.split.lo, cur->mperf.split.hi); |
Mike Travis | e39ad41 | 2009-01-04 05:18:10 -0800 | [diff] [blame] | 258 | } |
| 259 | |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 260 | /* |
| 261 | * Return the measured active (C0) frequency on this CPU since last call |
| 262 | * to this function. |
| 263 | * Input: cpu number |
| 264 | * Return: Average CPU frequency in terms of max frequency (zero on error) |
| 265 | * |
| 266 | * We use IA32_MPERF and IA32_APERF MSRs to get the measured performance |
| 267 | * over a period of time, while CPU is in C0 state. |
| 268 | * IA32_MPERF counts at the rate of max advertised frequency |
| 269 | * IA32_APERF counts at the rate of actual CPU frequency |
| 270 | * Only IA32_APERF/IA32_MPERF ratio is architecturally defined and |
| 271 | * no meaning should be associated with absolute values of these MSRs. |
| 272 | */ |
venkatesh.pallipadi@intel.com | bf0b90e | 2008-08-04 11:59:07 -0700 | [diff] [blame] | 273 | static unsigned int get_measured_perf(struct cpufreq_policy *policy, |
| 274 | unsigned int cpu) |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 275 | { |
Venkatesh Pallipadi | 18b2646 | 2009-04-06 11:26:08 -0700 | [diff] [blame] | 276 | struct perf_pair readin, cur; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 277 | unsigned int perf_percent; |
| 278 | unsigned int retval; |
| 279 | |
Andrew Morton | 01599fc | 2009-04-13 10:27:49 -0700 | [diff] [blame^] | 280 | if (smp_call_function_single(cpu, read_measured_perf_ctrs, &cur, 1)) |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 281 | return 0; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 282 | |
Venkatesh Pallipadi | 18b2646 | 2009-04-06 11:26:08 -0700 | [diff] [blame] | 283 | cur.aperf.whole = readin.aperf.whole - |
| 284 | per_cpu(drv_data, cpu)->saved_aperf; |
| 285 | cur.mperf.whole = readin.mperf.whole - |
| 286 | per_cpu(drv_data, cpu)->saved_mperf; |
| 287 | per_cpu(drv_data, cpu)->saved_aperf = readin.aperf.whole; |
| 288 | per_cpu(drv_data, cpu)->saved_mperf = readin.mperf.whole; |
| 289 | |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 290 | #ifdef __i386__ |
| 291 | /* |
| 292 | * We dont want to do 64 bit divide with 32 bit kernel |
| 293 | * Get an approximate value. Return failure in case we cannot get |
| 294 | * an approximate value. |
| 295 | */ |
Venkatesh Pallipadi | e4f6937 | 2009-04-06 11:26:07 -0700 | [diff] [blame] | 296 | if (unlikely(cur.aperf.split.hi || cur.mperf.split.hi)) { |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 297 | int shift_count; |
| 298 | u32 h; |
| 299 | |
Venkatesh Pallipadi | e4f6937 | 2009-04-06 11:26:07 -0700 | [diff] [blame] | 300 | h = max_t(u32, cur.aperf.split.hi, cur.mperf.split.hi); |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 301 | shift_count = fls(h); |
| 302 | |
Venkatesh Pallipadi | e4f6937 | 2009-04-06 11:26:07 -0700 | [diff] [blame] | 303 | cur.aperf.whole >>= shift_count; |
| 304 | cur.mperf.whole >>= shift_count; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 305 | } |
| 306 | |
Venkatesh Pallipadi | e4f6937 | 2009-04-06 11:26:07 -0700 | [diff] [blame] | 307 | if (((unsigned long)(-1) / 100) < cur.aperf.split.lo) { |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 308 | int shift_count = 7; |
Venkatesh Pallipadi | e4f6937 | 2009-04-06 11:26:07 -0700 | [diff] [blame] | 309 | cur.aperf.split.lo >>= shift_count; |
| 310 | cur.mperf.split.lo >>= shift_count; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 311 | } |
| 312 | |
Venkatesh Pallipadi | e4f6937 | 2009-04-06 11:26:07 -0700 | [diff] [blame] | 313 | if (cur.aperf.split.lo && cur.mperf.split.lo) |
| 314 | perf_percent = (cur.aperf.split.lo * 100) / cur.mperf.split.lo; |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 315 | else |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 316 | perf_percent = 0; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 317 | |
| 318 | #else |
Venkatesh Pallipadi | e4f6937 | 2009-04-06 11:26:07 -0700 | [diff] [blame] | 319 | if (unlikely(((unsigned long)(-1) / 100) < cur.aperf.whole)) { |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 320 | int shift_count = 7; |
Venkatesh Pallipadi | e4f6937 | 2009-04-06 11:26:07 -0700 | [diff] [blame] | 321 | cur.aperf.whole >>= shift_count; |
| 322 | cur.mperf.whole >>= shift_count; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 323 | } |
| 324 | |
Venkatesh Pallipadi | e4f6937 | 2009-04-06 11:26:07 -0700 | [diff] [blame] | 325 | if (cur.aperf.whole && cur.mperf.whole) |
| 326 | perf_percent = (cur.aperf.whole * 100) / cur.mperf.whole; |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 327 | else |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 328 | perf_percent = 0; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 329 | |
| 330 | #endif |
| 331 | |
venkatesh.pallipadi@intel.com | bf0b90e | 2008-08-04 11:59:07 -0700 | [diff] [blame] | 332 | retval = per_cpu(drv_data, policy->cpu)->max_freq * perf_percent / 100; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 333 | |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 334 | return retval; |
| 335 | } |
| 336 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 337 | static unsigned int get_cur_freq_on_cpu(unsigned int cpu) |
| 338 | { |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 339 | struct acpi_cpufreq_data *data = per_cpu(drv_data, cpu); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 340 | unsigned int freq; |
Venkatesh Pallipadi | e56a727 | 2008-04-28 15:13:43 -0400 | [diff] [blame] | 341 | unsigned int cached_freq; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 342 | |
| 343 | dprintk("get_cur_freq_on_cpu (%d)\n", cpu); |
| 344 | |
| 345 | if (unlikely(data == NULL || |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 346 | data->acpi_data == NULL || data->freq_table == NULL)) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 347 | return 0; |
| 348 | } |
| 349 | |
Venkatesh Pallipadi | e56a727 | 2008-04-28 15:13:43 -0400 | [diff] [blame] | 350 | cached_freq = data->freq_table[data->acpi_data->state].frequency; |
Mike Travis | e39ad41 | 2009-01-04 05:18:10 -0800 | [diff] [blame] | 351 | freq = extract_freq(get_cur_val(cpumask_of(cpu)), data); |
Venkatesh Pallipadi | e56a727 | 2008-04-28 15:13:43 -0400 | [diff] [blame] | 352 | if (freq != cached_freq) { |
| 353 | /* |
| 354 | * The dreaded BIOS frequency change behind our back. |
| 355 | * Force set the frequency on next target call. |
| 356 | */ |
| 357 | data->resume = 1; |
| 358 | } |
| 359 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 360 | dprintk("cur freq = %u\n", freq); |
| 361 | |
| 362 | return freq; |
| 363 | } |
| 364 | |
Mike Travis | 7285908 | 2009-01-16 15:31:15 -0800 | [diff] [blame] | 365 | static unsigned int check_freqs(const struct cpumask *mask, unsigned int freq, |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 366 | struct acpi_cpufreq_data *data) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 367 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 368 | unsigned int cur_freq; |
| 369 | unsigned int i; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 370 | |
Dave Jones | 3a58df3 | 2009-01-17 22:36:14 -0500 | [diff] [blame] | 371 | for (i = 0; i < 100; i++) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 372 | cur_freq = extract_freq(get_cur_val(mask), data); |
| 373 | if (cur_freq == freq) |
| 374 | return 1; |
| 375 | udelay(10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | } |
| 377 | return 0; |
| 378 | } |
| 379 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 380 | static int acpi_cpufreq_target(struct cpufreq_policy *policy, |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 381 | unsigned int target_freq, unsigned int relation) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | { |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 383 | struct acpi_cpufreq_data *data = per_cpu(drv_data, policy->cpu); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 384 | struct acpi_processor_performance *perf; |
| 385 | struct cpufreq_freqs freqs; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 386 | struct drv_cmd cmd; |
Venkatesh Pallipadi | 8edc59d9 | 2006-12-19 12:58:55 -0800 | [diff] [blame] | 387 | unsigned int next_state = 0; /* Index into freq_table */ |
| 388 | unsigned int next_perf_state = 0; /* Index into perf table */ |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 389 | unsigned int i; |
| 390 | int result = 0; |
Arjan van de Ven | f3f47a6 | 2008-11-23 16:49:58 -0800 | [diff] [blame] | 391 | struct power_trace it; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 393 | dprintk("acpi_cpufreq_target %d (%d)\n", target_freq, policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 395 | if (unlikely(data == NULL || |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 396 | data->acpi_data == NULL || data->freq_table == NULL)) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 397 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | } |
| 399 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 400 | perf = data->acpi_data; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 401 | result = cpufreq_frequency_table_target(policy, |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 402 | data->freq_table, |
| 403 | target_freq, |
| 404 | relation, &next_state); |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 405 | if (unlikely(result)) { |
| 406 | result = -ENODEV; |
| 407 | goto out; |
| 408 | } |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 409 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 410 | next_perf_state = data->freq_table[next_state].index; |
Venkatesh Pallipadi | 7650b28 | 2006-10-03 12:36:30 -0700 | [diff] [blame] | 411 | if (perf->state == next_perf_state) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 412 | if (unlikely(data->resume)) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 413 | dprintk("Called after resume, resetting to P%d\n", |
| 414 | next_perf_state); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 415 | data->resume = 0; |
| 416 | } else { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 417 | dprintk("Already at target state (P%d)\n", |
| 418 | next_perf_state); |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 419 | goto out; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 420 | } |
| 421 | } |
| 422 | |
Arjan van de Ven | f3f47a6 | 2008-11-23 16:49:58 -0800 | [diff] [blame] | 423 | trace_power_mark(&it, POWER_PSTATE, next_perf_state); |
| 424 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 425 | switch (data->cpu_feature) { |
| 426 | case SYSTEM_INTEL_MSR_CAPABLE: |
| 427 | cmd.type = SYSTEM_INTEL_MSR_CAPABLE; |
| 428 | cmd.addr.msr.reg = MSR_IA32_PERF_CTL; |
Venki Pallipadi | 13424f6 | 2007-05-23 15:42:13 -0700 | [diff] [blame] | 429 | cmd.val = (u32) perf->states[next_perf_state].control; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 430 | break; |
| 431 | case SYSTEM_IO_CAPABLE: |
| 432 | cmd.type = SYSTEM_IO_CAPABLE; |
| 433 | cmd.addr.io.port = perf->control_register.address; |
| 434 | cmd.addr.io.bit_width = perf->control_register.bit_width; |
| 435 | cmd.val = (u32) perf->states[next_perf_state].control; |
| 436 | break; |
| 437 | default: |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 438 | result = -ENODEV; |
| 439 | goto out; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 440 | } |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 441 | |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 442 | /* cpufreq holds the hotplug lock, so we are safe from here on */ |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 443 | if (policy->shared_type != CPUFREQ_SHARED_TYPE_ANY) |
Ingo Molnar | bfa318a | 2009-01-15 15:46:08 +0100 | [diff] [blame] | 444 | cmd.mask = policy->cpus; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 445 | else |
Ingo Molnar | bfa318a | 2009-01-15 15:46:08 +0100 | [diff] [blame] | 446 | cmd.mask = cpumask_of(policy->cpu); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 447 | |
Venkatesh Pallipadi | 8edc59d9 | 2006-12-19 12:58:55 -0800 | [diff] [blame] | 448 | freqs.old = perf->states[perf->state].core_frequency * 1000; |
| 449 | freqs.new = data->freq_table[next_state].frequency; |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 450 | for_each_cpu(i, cmd.mask) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 451 | freqs.cpu = i; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 452 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); |
| 453 | } |
| 454 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 455 | drv_write(&cmd); |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 456 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 457 | if (acpi_pstate_strict) { |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 458 | if (!check_freqs(cmd.mask, freqs.new, data)) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 459 | dprintk("acpi_cpufreq_target failed (%d)\n", |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 460 | policy->cpu); |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 461 | result = -EAGAIN; |
| 462 | goto out; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 463 | } |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 464 | } |
| 465 | |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 466 | for_each_cpu(i, cmd.mask) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 467 | freqs.cpu = i; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 468 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); |
| 469 | } |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 470 | perf->state = next_perf_state; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 471 | |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 472 | out: |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 473 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | } |
| 475 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 476 | static int acpi_cpufreq_verify(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | { |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 478 | struct acpi_cpufreq_data *data = per_cpu(drv_data, policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | |
| 480 | dprintk("acpi_cpufreq_verify\n"); |
| 481 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 482 | return cpufreq_frequency_table_verify(policy, data->freq_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | } |
| 484 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | static unsigned long |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 486 | acpi_cpufreq_guess_freq(struct acpi_cpufreq_data *data, unsigned int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 488 | struct acpi_processor_performance *perf = data->acpi_data; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 489 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | if (cpu_khz) { |
| 491 | /* search the closest match to cpu_khz */ |
| 492 | unsigned int i; |
| 493 | unsigned long freq; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 494 | unsigned long freqn = perf->states[0].core_frequency * 1000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | |
Dave Jones | 3a58df3 | 2009-01-17 22:36:14 -0500 | [diff] [blame] | 496 | for (i = 0; i < (perf->state_count-1); i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | freq = freqn; |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 498 | freqn = perf->states[i+1].core_frequency * 1000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | if ((2 * cpu_khz) > (freqn + freq)) { |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 500 | perf->state = i; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 501 | return freq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | } |
| 503 | } |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 504 | perf->state = perf->state_count-1; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 505 | return freqn; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 506 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | /* assume CPU is at P0... */ |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 508 | perf->state = 0; |
| 509 | return perf->states[0].core_frequency * 1000; |
| 510 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | } |
| 512 | |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 513 | static void free_acpi_perf_data(void) |
| 514 | { |
| 515 | unsigned int i; |
| 516 | |
| 517 | /* Freeing a NULL pointer is OK, and alloc_percpu zeroes. */ |
| 518 | for_each_possible_cpu(i) |
| 519 | free_cpumask_var(per_cpu_ptr(acpi_perf_data, i) |
| 520 | ->shared_cpu_map); |
| 521 | free_percpu(acpi_perf_data); |
| 522 | } |
| 523 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 524 | /* |
| 525 | * acpi_cpufreq_early_init - initialize ACPI P-States library |
| 526 | * |
| 527 | * Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c) |
| 528 | * in order to determine correct frequency and voltage pairings. We can |
| 529 | * do _PDC and _PSD and find out the processor dependency for the |
| 530 | * actual init that will happen later... |
| 531 | */ |
Fenghua Yu | 5010929 | 2007-08-07 18:40:30 -0400 | [diff] [blame] | 532 | static int __init acpi_cpufreq_early_init(void) |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 533 | { |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 534 | unsigned int i; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 535 | dprintk("acpi_cpufreq_early_init\n"); |
| 536 | |
Fenghua Yu | 5010929 | 2007-08-07 18:40:30 -0400 | [diff] [blame] | 537 | acpi_perf_data = alloc_percpu(struct acpi_processor_performance); |
| 538 | if (!acpi_perf_data) { |
| 539 | dprintk("Memory allocation error for acpi_perf_data.\n"); |
| 540 | return -ENOMEM; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 541 | } |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 542 | for_each_possible_cpu(i) { |
Mike Travis | 80855f7 | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 543 | if (!alloc_cpumask_var_node( |
| 544 | &per_cpu_ptr(acpi_perf_data, i)->shared_cpu_map, |
| 545 | GFP_KERNEL, cpu_to_node(i))) { |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 546 | |
| 547 | /* Freeing a NULL pointer is OK: alloc_percpu zeroes. */ |
| 548 | free_acpi_perf_data(); |
| 549 | return -ENOMEM; |
| 550 | } |
| 551 | } |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 552 | |
| 553 | /* Do initialization in ACPI core */ |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 554 | acpi_processor_preregister_performance(acpi_perf_data); |
| 555 | return 0; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 556 | } |
| 557 | |
Dave Jones | 95625b8 | 2006-10-21 01:37:39 -0400 | [diff] [blame] | 558 | #ifdef CONFIG_SMP |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 559 | /* |
| 560 | * Some BIOSes do SW_ANY coordination internally, either set it up in hw |
| 561 | * or do it in BIOS firmware and won't inform about it to OS. If not |
| 562 | * detected, this has a side effect of making CPU run at a different speed |
| 563 | * than OS intended it to run at. Detect it and handle it cleanly. |
| 564 | */ |
| 565 | static int bios_with_sw_any_bug; |
| 566 | |
Jeff Garzik | 1855256 | 2007-10-03 15:15:40 -0400 | [diff] [blame] | 567 | static int sw_any_bug_found(const struct dmi_system_id *d) |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 568 | { |
| 569 | bios_with_sw_any_bug = 1; |
| 570 | return 0; |
| 571 | } |
| 572 | |
Jeff Garzik | 1855256 | 2007-10-03 15:15:40 -0400 | [diff] [blame] | 573 | static const struct dmi_system_id sw_any_bug_dmi_table[] = { |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 574 | { |
| 575 | .callback = sw_any_bug_found, |
| 576 | .ident = "Supermicro Server X6DLP", |
| 577 | .matches = { |
| 578 | DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"), |
| 579 | DMI_MATCH(DMI_BIOS_VERSION, "080010"), |
| 580 | DMI_MATCH(DMI_PRODUCT_NAME, "X6DLP"), |
| 581 | }, |
| 582 | }, |
| 583 | { } |
| 584 | }; |
Dave Jones | 95625b8 | 2006-10-21 01:37:39 -0400 | [diff] [blame] | 585 | #endif |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 586 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 587 | static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 589 | unsigned int i; |
| 590 | unsigned int valid_states = 0; |
| 591 | unsigned int cpu = policy->cpu; |
| 592 | struct acpi_cpufreq_data *data; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 593 | unsigned int result = 0; |
Mike Travis | 92cb761 | 2007-10-19 20:35:04 +0200 | [diff] [blame] | 594 | struct cpuinfo_x86 *c = &cpu_data(policy->cpu); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 595 | struct acpi_processor_performance *perf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | dprintk("acpi_cpufreq_cpu_init\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 599 | data = kzalloc(sizeof(struct acpi_cpufreq_data), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | if (!data) |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 601 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | |
Rusty Russell | b36128c | 2009-02-20 16:29:08 +0900 | [diff] [blame] | 603 | data->acpi_data = per_cpu_ptr(acpi_perf_data, cpu); |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 604 | per_cpu(drv_data, cpu) = data; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 605 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 606 | if (cpu_has(c, X86_FEATURE_CONSTANT_TSC)) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 607 | acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 609 | result = acpi_processor_register_performance(data->acpi_data, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | if (result) |
| 611 | goto err_free; |
| 612 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 613 | perf = data->acpi_data; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 614 | policy->shared_type = perf->shared_type; |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 615 | |
Venkatesh Pallipadi | 46f18e3 | 2006-06-26 00:34:43 -0400 | [diff] [blame] | 616 | /* |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 617 | * Will let policy->cpus know about dependency only when software |
Venkatesh Pallipadi | 46f18e3 | 2006-06-26 00:34:43 -0400 | [diff] [blame] | 618 | * coordination is required. |
| 619 | */ |
| 620 | if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL || |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 621 | policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) { |
Rusty Russell | 835481d | 2009-01-04 05:18:06 -0800 | [diff] [blame] | 622 | cpumask_copy(policy->cpus, perf->shared_cpu_map); |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 623 | } |
Rusty Russell | 835481d | 2009-01-04 05:18:06 -0800 | [diff] [blame] | 624 | cpumask_copy(policy->related_cpus, perf->shared_cpu_map); |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 625 | |
| 626 | #ifdef CONFIG_SMP |
| 627 | dmi_check_system(sw_any_bug_dmi_table); |
Rusty Russell | 835481d | 2009-01-04 05:18:06 -0800 | [diff] [blame] | 628 | if (bios_with_sw_any_bug && cpumask_weight(policy->cpus) == 1) { |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 629 | policy->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
Rusty Russell | 835481d | 2009-01-04 05:18:06 -0800 | [diff] [blame] | 630 | cpumask_copy(policy->cpus, cpu_core_mask(cpu)); |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 631 | } |
| 632 | #endif |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 633 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | /* capability check */ |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 635 | if (perf->state_count <= 1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | dprintk("No P-States\n"); |
| 637 | result = -ENODEV; |
| 638 | goto err_unreg; |
| 639 | } |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 640 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 641 | if (perf->control_register.space_id != perf->status_register.space_id) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | result = -ENODEV; |
| 643 | goto err_unreg; |
| 644 | } |
| 645 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 646 | switch (perf->control_register.space_id) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 647 | case ACPI_ADR_SPACE_SYSTEM_IO: |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 648 | dprintk("SYSTEM IO addr space\n"); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 649 | data->cpu_feature = SYSTEM_IO_CAPABLE; |
| 650 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 651 | case ACPI_ADR_SPACE_FIXED_HARDWARE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 652 | dprintk("HARDWARE addr space\n"); |
| 653 | if (!check_est_cpu(cpu)) { |
| 654 | result = -ENODEV; |
| 655 | goto err_unreg; |
| 656 | } |
| 657 | data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 658 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 659 | default: |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 660 | dprintk("Unknown addr space %d\n", |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 661 | (u32) (perf->control_register.space_id)); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 662 | result = -ENODEV; |
| 663 | goto err_unreg; |
| 664 | } |
| 665 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 666 | data->freq_table = kmalloc(sizeof(struct cpufreq_frequency_table) * |
| 667 | (perf->state_count+1), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | if (!data->freq_table) { |
| 669 | result = -ENOMEM; |
| 670 | goto err_unreg; |
| 671 | } |
| 672 | |
| 673 | /* detect transition latency */ |
| 674 | policy->cpuinfo.transition_latency = 0; |
Dave Jones | 3a58df3 | 2009-01-17 22:36:14 -0500 | [diff] [blame] | 675 | for (i = 0; i < perf->state_count; i++) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 676 | if ((perf->states[i].transition_latency * 1000) > |
| 677 | policy->cpuinfo.transition_latency) |
| 678 | policy->cpuinfo.transition_latency = |
| 679 | perf->states[i].transition_latency * 1000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | |
Pallipadi, Venkatesh | a59d163 | 2009-03-19 14:41:40 -0700 | [diff] [blame] | 682 | /* Check for high latency (>20uS) from buggy BIOSes, like on T42 */ |
| 683 | if (perf->control_register.space_id == ACPI_ADR_SPACE_FIXED_HARDWARE && |
| 684 | policy->cpuinfo.transition_latency > 20 * 1000) { |
| 685 | static int print_once; |
| 686 | policy->cpuinfo.transition_latency = 20 * 1000; |
| 687 | if (!print_once) { |
| 688 | print_once = 1; |
| 689 | printk(KERN_INFO "Capping off P-state tranision latency" |
| 690 | " at 20 uS\n"); |
| 691 | } |
| 692 | } |
| 693 | |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 694 | data->max_freq = perf->states[0].core_frequency * 1000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | /* table init */ |
Dave Jones | 3a58df3 | 2009-01-17 22:36:14 -0500 | [diff] [blame] | 696 | for (i = 0; i < perf->state_count; i++) { |
| 697 | if (i > 0 && perf->states[i].core_frequency >= |
Zhang Rui | 3cdf552 | 2007-06-13 21:24:02 -0400 | [diff] [blame] | 698 | data->freq_table[valid_states-1].frequency / 1000) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 699 | continue; |
| 700 | |
| 701 | data->freq_table[valid_states].index = i; |
| 702 | data->freq_table[valid_states].frequency = |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 703 | perf->states[i].core_frequency * 1000; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 704 | valid_states++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | } |
Venkatesh Pallipadi | 3d4a7ef | 2006-11-13 17:47:44 -0800 | [diff] [blame] | 706 | data->freq_table[valid_states].frequency = CPUFREQ_TABLE_END; |
Venkatesh Pallipadi | 8edc59d9 | 2006-12-19 12:58:55 -0800 | [diff] [blame] | 707 | perf->state = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | |
| 709 | result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table); |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 710 | if (result) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | goto err_freqfree; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | |
Mattia Dongili | a507ac4 | 2006-12-15 19:52:45 +0100 | [diff] [blame] | 713 | switch (perf->control_register.space_id) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 714 | case ACPI_ADR_SPACE_SYSTEM_IO: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 715 | /* Current speed is unknown and not detectable by IO port */ |
| 716 | policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu); |
| 717 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 718 | case ACPI_ADR_SPACE_FIXED_HARDWARE: |
Venkatesh Pallipadi | 7650b28 | 2006-10-03 12:36:30 -0700 | [diff] [blame] | 719 | acpi_cpufreq_driver.get = get_cur_freq_on_cpu; |
Mattia Dongili | a507ac4 | 2006-12-15 19:52:45 +0100 | [diff] [blame] | 720 | policy->cur = get_cur_freq_on_cpu(cpu); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 721 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 722 | default: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 723 | break; |
| 724 | } |
| 725 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | /* notify BIOS that we exist */ |
| 727 | acpi_processor_notify_smm(THIS_MODULE); |
| 728 | |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 729 | /* Check for APERF/MPERF support in hardware */ |
| 730 | if (c->x86_vendor == X86_VENDOR_INTEL && c->cpuid_level >= 6) { |
| 731 | unsigned int ecx; |
| 732 | ecx = cpuid_ecx(6); |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 733 | if (ecx & CPUID_6_ECX_APERFMPERF_CAPABILITY) |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 734 | acpi_cpufreq_driver.getavg = get_measured_perf; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 735 | } |
| 736 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 737 | dprintk("CPU%u - ACPI performance management activated.\n", cpu); |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 738 | for (i = 0; i < perf->state_count; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | dprintk(" %cP%d: %d MHz, %d mW, %d uS\n", |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 740 | (i == perf->state ? '*' : ' '), i, |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 741 | (u32) perf->states[i].core_frequency, |
| 742 | (u32) perf->states[i].power, |
| 743 | (u32) perf->states[i].transition_latency); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | |
| 745 | cpufreq_frequency_table_get_attr(data->freq_table, policy->cpu); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 746 | |
Dominik Brodowski | 4b31e77 | 2005-05-18 13:49:00 -0400 | [diff] [blame] | 747 | /* |
| 748 | * the first call to ->target() should result in us actually |
| 749 | * writing something to the appropriate registers. |
| 750 | */ |
| 751 | data->resume = 1; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 752 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 753 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 755 | err_freqfree: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | kfree(data->freq_table); |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 757 | err_unreg: |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 758 | acpi_processor_unregister_performance(perf, cpu); |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 759 | err_free: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | kfree(data); |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 761 | per_cpu(drv_data, cpu) = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 763 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | } |
| 765 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 766 | static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | { |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 768 | struct acpi_cpufreq_data *data = per_cpu(drv_data, policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | dprintk("acpi_cpufreq_cpu_exit\n"); |
| 771 | |
| 772 | if (data) { |
| 773 | cpufreq_frequency_table_put_attr(policy->cpu); |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 774 | per_cpu(drv_data, policy->cpu) = NULL; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 775 | acpi_processor_unregister_performance(data->acpi_data, |
| 776 | policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | kfree(data); |
| 778 | } |
| 779 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 780 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | } |
| 782 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 783 | static int acpi_cpufreq_resume(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | { |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 785 | struct acpi_cpufreq_data *data = per_cpu(drv_data, policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | dprintk("acpi_cpufreq_resume\n"); |
| 788 | |
| 789 | data->resume = 1; |
| 790 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 791 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | } |
| 793 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 794 | static struct freq_attr *acpi_cpufreq_attr[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | &cpufreq_freq_attr_scaling_available_freqs, |
| 796 | NULL, |
| 797 | }; |
| 798 | |
| 799 | static struct cpufreq_driver acpi_cpufreq_driver = { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 800 | .verify = acpi_cpufreq_verify, |
| 801 | .target = acpi_cpufreq_target, |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 802 | .init = acpi_cpufreq_cpu_init, |
| 803 | .exit = acpi_cpufreq_cpu_exit, |
| 804 | .resume = acpi_cpufreq_resume, |
| 805 | .name = "acpi-cpufreq", |
| 806 | .owner = THIS_MODULE, |
| 807 | .attr = acpi_cpufreq_attr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | }; |
| 809 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 810 | static int __init acpi_cpufreq_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | { |
Fenghua Yu | 5010929 | 2007-08-07 18:40:30 -0400 | [diff] [blame] | 812 | int ret; |
| 813 | |
Yinghai Lu | ee29753 | 2008-09-24 19:04:31 -0700 | [diff] [blame] | 814 | if (acpi_disabled) |
| 815 | return 0; |
| 816 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | dprintk("acpi_cpufreq_init\n"); |
| 818 | |
Fenghua Yu | 5010929 | 2007-08-07 18:40:30 -0400 | [diff] [blame] | 819 | ret = acpi_cpufreq_early_init(); |
| 820 | if (ret) |
| 821 | return ret; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 822 | |
Akinobu Mita | 847aef6 | 2008-07-14 11:59:44 +0900 | [diff] [blame] | 823 | ret = cpufreq_register_driver(&acpi_cpufreq_driver); |
| 824 | if (ret) |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 825 | free_acpi_perf_data(); |
Akinobu Mita | 847aef6 | 2008-07-14 11:59:44 +0900 | [diff] [blame] | 826 | |
| 827 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | } |
| 829 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 830 | static void __exit acpi_cpufreq_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | { |
| 832 | dprintk("acpi_cpufreq_exit\n"); |
| 833 | |
| 834 | cpufreq_unregister_driver(&acpi_cpufreq_driver); |
| 835 | |
Fenghua Yu | 5010929 | 2007-08-07 18:40:30 -0400 | [diff] [blame] | 836 | free_percpu(acpi_perf_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | } |
| 838 | |
Venkatesh Pallipadi | d395bf1 | 2005-08-25 15:59:00 -0400 | [diff] [blame] | 839 | module_param(acpi_pstate_strict, uint, 0644); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 840 | MODULE_PARM_DESC(acpi_pstate_strict, |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 841 | "value 0 or non-zero. non-zero -> strict ACPI checks are " |
| 842 | "performed during frequency changes."); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | |
| 844 | late_initcall(acpi_cpufreq_init); |
| 845 | module_exit(acpi_cpufreq_exit); |
| 846 | |
| 847 | MODULE_ALIAS("acpi"); |