Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 2 | * acpi-cpufreq.c - ACPI Processor P-States Driver ($Revision: 1.4 $) |
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 | f3f47a6 | 2008-11-23 16:49:58 -0800 | [diff] [blame] | 36 | #include <linux/ftrace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
| 38 | #include <linux/acpi.h> |
| 39 | #include <acpi/processor.h> |
| 40 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 41 | #include <asm/io.h> |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 42 | #include <asm/msr.h> |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 43 | #include <asm/processor.h> |
| 44 | #include <asm/cpufeature.h> |
| 45 | #include <asm/delay.h> |
| 46 | #include <asm/uaccess.h> |
| 47 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "acpi-cpufreq", msg) |
| 49 | |
| 50 | MODULE_AUTHOR("Paul Diefenbaugh, Dominik Brodowski"); |
| 51 | MODULE_DESCRIPTION("ACPI Processor P-States Driver"); |
| 52 | MODULE_LICENSE("GPL"); |
| 53 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 54 | enum { |
| 55 | UNDEFINED_CAPABLE = 0, |
| 56 | SYSTEM_INTEL_MSR_CAPABLE, |
| 57 | SYSTEM_IO_CAPABLE, |
| 58 | }; |
| 59 | |
| 60 | #define INTEL_MSR_RANGE (0xffff) |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 61 | #define CPUID_6_ECX_APERFMPERF_CAPABILITY (0x1) |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 62 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 63 | struct acpi_cpufreq_data { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 64 | struct acpi_processor_performance *acpi_data; |
| 65 | struct cpufreq_frequency_table *freq_table; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 66 | unsigned int max_freq; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 67 | unsigned int resume; |
| 68 | unsigned int cpu_feature; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | }; |
| 70 | |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 71 | static DEFINE_PER_CPU(struct acpi_cpufreq_data *, drv_data); |
| 72 | |
Fenghua Yu | 5010929 | 2007-08-07 18:40:30 -0400 | [diff] [blame] | 73 | /* acpi_perf_data is a pointer to percpu data. */ |
| 74 | static struct acpi_processor_performance *acpi_perf_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | |
| 76 | static struct cpufreq_driver acpi_cpufreq_driver; |
| 77 | |
Venkatesh Pallipadi | d395bf1 | 2005-08-25 15:59:00 -0400 | [diff] [blame] | 78 | static unsigned int acpi_pstate_strict; |
| 79 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 80 | static int check_est_cpu(unsigned int cpuid) |
| 81 | { |
Mike Travis | 92cb761 | 2007-10-19 20:35:04 +0200 | [diff] [blame] | 82 | struct cpuinfo_x86 *cpu = &cpu_data(cpuid); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 83 | |
| 84 | if (cpu->x86_vendor != X86_VENDOR_INTEL || |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 85 | !cpu_has(cpu, X86_FEATURE_EST)) |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 86 | return 0; |
| 87 | |
| 88 | return 1; |
| 89 | } |
| 90 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 91 | static unsigned extract_io(u32 value, struct acpi_cpufreq_data *data) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 92 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 93 | struct acpi_processor_performance *perf; |
| 94 | int i; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 95 | |
| 96 | perf = data->acpi_data; |
| 97 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 98 | for (i=0; i<perf->state_count; i++) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 99 | if (value == perf->states[i].status) |
| 100 | return data->freq_table[i].frequency; |
| 101 | } |
| 102 | return 0; |
| 103 | } |
| 104 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 105 | static unsigned extract_msr(u32 msr, struct acpi_cpufreq_data *data) |
| 106 | { |
| 107 | int i; |
Venkatesh Pallipadi | a6f6e6e6 | 2006-10-03 12:37:42 -0700 | [diff] [blame] | 108 | struct acpi_processor_performance *perf; |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 109 | |
| 110 | msr &= INTEL_MSR_RANGE; |
Venkatesh Pallipadi | a6f6e6e6 | 2006-10-03 12:37:42 -0700 | [diff] [blame] | 111 | perf = data->acpi_data; |
| 112 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 113 | for (i=0; data->freq_table[i].frequency != CPUFREQ_TABLE_END; i++) { |
Venkatesh Pallipadi | a6f6e6e6 | 2006-10-03 12:37:42 -0700 | [diff] [blame] | 114 | if (msr == perf->states[data->freq_table[i].index].status) |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 115 | return data->freq_table[i].frequency; |
| 116 | } |
| 117 | return data->freq_table[0].frequency; |
| 118 | } |
| 119 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 120 | static unsigned extract_freq(u32 val, struct acpi_cpufreq_data *data) |
| 121 | { |
| 122 | switch (data->cpu_feature) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 123 | case SYSTEM_INTEL_MSR_CAPABLE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 124 | return extract_msr(val, data); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 125 | case SYSTEM_IO_CAPABLE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 126 | return extract_io(val, data); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 127 | default: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 128 | return 0; |
| 129 | } |
| 130 | } |
| 131 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 132 | struct msr_addr { |
| 133 | u32 reg; |
| 134 | }; |
| 135 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 136 | struct io_addr { |
| 137 | u16 port; |
| 138 | u8 bit_width; |
| 139 | }; |
| 140 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 141 | typedef union { |
| 142 | struct msr_addr msr; |
| 143 | struct io_addr io; |
| 144 | } drv_addr_union; |
| 145 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 146 | struct drv_cmd { |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 147 | unsigned int type; |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 148 | cpumask_var_t mask; |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 149 | drv_addr_union addr; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 150 | u32 val; |
| 151 | }; |
| 152 | |
Mike Travis | 7503bfb | 2009-01-04 05:18:09 -0800 | [diff] [blame] | 153 | static long do_drv_read(void *_cmd) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 154 | { |
Mike Travis | 7503bfb | 2009-01-04 05:18:09 -0800 | [diff] [blame] | 155 | struct drv_cmd *cmd = _cmd; |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 156 | u32 h; |
| 157 | |
| 158 | switch (cmd->type) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 159 | case SYSTEM_INTEL_MSR_CAPABLE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 160 | rdmsr(cmd->addr.msr.reg, cmd->val, h); |
| 161 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 162 | case SYSTEM_IO_CAPABLE: |
Venkatesh Pallipadi | 4e581ff | 2006-12-13 10:41:16 -0800 | [diff] [blame] | 163 | acpi_os_read_port((acpi_io_address)cmd->addr.io.port, |
| 164 | &cmd->val, |
| 165 | (u32)cmd->addr.io.bit_width); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 166 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 167 | default: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 168 | break; |
| 169 | } |
Mike Travis | 7503bfb | 2009-01-04 05:18:09 -0800 | [diff] [blame] | 170 | return 0; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 171 | } |
| 172 | |
Mike Travis | 7503bfb | 2009-01-04 05:18:09 -0800 | [diff] [blame] | 173 | static long do_drv_write(void *_cmd) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 174 | { |
Mike Travis | 7503bfb | 2009-01-04 05:18:09 -0800 | [diff] [blame] | 175 | struct drv_cmd *cmd = _cmd; |
Venki Pallipadi | 13424f6 | 2007-05-23 15:42:13 -0700 | [diff] [blame] | 176 | u32 lo, hi; |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 177 | |
| 178 | switch (cmd->type) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 179 | case SYSTEM_INTEL_MSR_CAPABLE: |
Venki Pallipadi | 13424f6 | 2007-05-23 15:42:13 -0700 | [diff] [blame] | 180 | rdmsr(cmd->addr.msr.reg, lo, hi); |
| 181 | lo = (lo & ~INTEL_MSR_RANGE) | (cmd->val & INTEL_MSR_RANGE); |
| 182 | wrmsr(cmd->addr.msr.reg, lo, hi); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 183 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 184 | case SYSTEM_IO_CAPABLE: |
Venkatesh Pallipadi | 4e581ff | 2006-12-13 10:41:16 -0800 | [diff] [blame] | 185 | acpi_os_write_port((acpi_io_address)cmd->addr.io.port, |
| 186 | cmd->val, |
| 187 | (u32)cmd->addr.io.bit_width); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 188 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 189 | default: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 190 | break; |
| 191 | } |
Mike Travis | 7503bfb | 2009-01-04 05:18:09 -0800 | [diff] [blame] | 192 | return 0; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 193 | } |
| 194 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 195 | static void drv_read(struct drv_cmd *cmd) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 196 | { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 197 | cmd->val = 0; |
| 198 | |
Mike Travis | 7503bfb | 2009-01-04 05:18:09 -0800 | [diff] [blame] | 199 | work_on_cpu(cpumask_any(cmd->mask), do_drv_read, cmd); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 200 | } |
| 201 | |
| 202 | static void drv_write(struct drv_cmd *cmd) |
| 203 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 204 | unsigned int i; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 205 | |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 206 | for_each_cpu(i, cmd->mask) { |
Mike Travis | 7503bfb | 2009-01-04 05:18:09 -0800 | [diff] [blame] | 207 | work_on_cpu(i, do_drv_write, cmd); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 208 | } |
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 | |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 219 | switch (per_cpu(drv_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; |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 226 | perf = per_cpu(drv_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 | |
Mike Travis | 7503bfb | 2009-01-04 05:18:09 -0800 | [diff] [blame] | 234 | if (unlikely(!alloc_cpumask_var(&cmd.mask, GFP_KERNEL))) |
| 235 | return 0; |
| 236 | |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 237 | cpumask_copy(cmd.mask, mask); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 238 | |
| 239 | drv_read(&cmd); |
| 240 | |
Mike Travis | 7503bfb | 2009-01-04 05:18:09 -0800 | [diff] [blame] | 241 | free_cpumask_var(cmd.mask); |
| 242 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 243 | dprintk("get_cur_val = %u\n", cmd.val); |
| 244 | |
| 245 | return cmd.val; |
| 246 | } |
| 247 | |
Mike Travis | e39ad41 | 2009-01-04 05:18:10 -0800 | [diff] [blame^] | 248 | struct perf_cur { |
| 249 | union { |
| 250 | struct { |
| 251 | u32 lo; |
| 252 | u32 hi; |
| 253 | } split; |
| 254 | u64 whole; |
| 255 | } aperf_cur, mperf_cur; |
| 256 | }; |
| 257 | |
| 258 | |
| 259 | static long read_measured_perf_ctrs(void *_cur) |
| 260 | { |
| 261 | struct perf_cur *cur = _cur; |
| 262 | |
| 263 | rdmsr(MSR_IA32_APERF, cur->aperf_cur.split.lo, cur->aperf_cur.split.hi); |
| 264 | rdmsr(MSR_IA32_MPERF, cur->mperf_cur.split.lo, cur->mperf_cur.split.hi); |
| 265 | |
| 266 | wrmsr(MSR_IA32_APERF, 0, 0); |
| 267 | wrmsr(MSR_IA32_MPERF, 0, 0); |
| 268 | |
| 269 | return 0; |
| 270 | } |
| 271 | |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 272 | /* |
| 273 | * Return the measured active (C0) frequency on this CPU since last call |
| 274 | * to this function. |
| 275 | * Input: cpu number |
| 276 | * Return: Average CPU frequency in terms of max frequency (zero on error) |
| 277 | * |
| 278 | * We use IA32_MPERF and IA32_APERF MSRs to get the measured performance |
| 279 | * over a period of time, while CPU is in C0 state. |
| 280 | * IA32_MPERF counts at the rate of max advertised frequency |
| 281 | * IA32_APERF counts at the rate of actual CPU frequency |
| 282 | * Only IA32_APERF/IA32_MPERF ratio is architecturally defined and |
| 283 | * no meaning should be associated with absolute values of these MSRs. |
| 284 | */ |
venkatesh.pallipadi@intel.com | bf0b90e | 2008-08-04 11:59:07 -0700 | [diff] [blame] | 285 | static unsigned int get_measured_perf(struct cpufreq_policy *policy, |
| 286 | unsigned int cpu) |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 287 | { |
Mike Travis | e39ad41 | 2009-01-04 05:18:10 -0800 | [diff] [blame^] | 288 | struct perf_cur cur; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 289 | unsigned int perf_percent; |
| 290 | unsigned int retval; |
| 291 | |
Mike Travis | e39ad41 | 2009-01-04 05:18:10 -0800 | [diff] [blame^] | 292 | if (!work_on_cpu(cpu, read_measured_perf_ctrs, &cur)) |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 293 | return 0; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 294 | |
| 295 | #ifdef __i386__ |
| 296 | /* |
| 297 | * We dont want to do 64 bit divide with 32 bit kernel |
| 298 | * Get an approximate value. Return failure in case we cannot get |
| 299 | * an approximate value. |
| 300 | */ |
Mike Travis | e39ad41 | 2009-01-04 05:18:10 -0800 | [diff] [blame^] | 301 | if (unlikely(cur.aperf_cur.split.hi || cur.mperf_cur.split.hi)) { |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 302 | int shift_count; |
| 303 | u32 h; |
| 304 | |
Mike Travis | e39ad41 | 2009-01-04 05:18:10 -0800 | [diff] [blame^] | 305 | h = max_t(u32, cur.aperf_cur.split.hi, cur.mperf_cur.split.hi); |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 306 | shift_count = fls(h); |
| 307 | |
Mike Travis | e39ad41 | 2009-01-04 05:18:10 -0800 | [diff] [blame^] | 308 | cur.aperf_cur.whole >>= shift_count; |
| 309 | cur.mperf_cur.whole >>= shift_count; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 310 | } |
| 311 | |
Mike Travis | e39ad41 | 2009-01-04 05:18:10 -0800 | [diff] [blame^] | 312 | if (((unsigned long)(-1) / 100) < cur.aperf_cur.split.lo) { |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 313 | int shift_count = 7; |
Mike Travis | e39ad41 | 2009-01-04 05:18:10 -0800 | [diff] [blame^] | 314 | cur.aperf_cur.split.lo >>= shift_count; |
| 315 | cur.mperf_cur.split.lo >>= shift_count; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 316 | } |
| 317 | |
Mike Travis | e39ad41 | 2009-01-04 05:18:10 -0800 | [diff] [blame^] | 318 | if (cur.aperf_cur.split.lo && cur.mperf_cur.split.lo) |
| 319 | perf_percent = (cur.aperf_cur.split.lo * 100) / |
| 320 | cur.mperf_cur.split.lo; |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 321 | else |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 322 | perf_percent = 0; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 323 | |
| 324 | #else |
Mike Travis | e39ad41 | 2009-01-04 05:18:10 -0800 | [diff] [blame^] | 325 | if (unlikely(((unsigned long)(-1) / 100) < cur.aperf_cur.whole)) { |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 326 | int shift_count = 7; |
Mike Travis | e39ad41 | 2009-01-04 05:18:10 -0800 | [diff] [blame^] | 327 | cur.aperf_cur.whole >>= shift_count; |
| 328 | cur.mperf_cur.whole >>= shift_count; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 329 | } |
| 330 | |
Mike Travis | e39ad41 | 2009-01-04 05:18:10 -0800 | [diff] [blame^] | 331 | if (cur.aperf_cur.whole && cur.mperf_cur.whole) |
| 332 | perf_percent = (cur.aperf_cur.whole * 100) / |
| 333 | cur.mperf_cur.whole; |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 334 | else |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 335 | perf_percent = 0; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 336 | |
| 337 | #endif |
| 338 | |
venkatesh.pallipadi@intel.com | bf0b90e | 2008-08-04 11:59:07 -0700 | [diff] [blame] | 339 | retval = per_cpu(drv_data, policy->cpu)->max_freq * perf_percent / 100; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 340 | |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 341 | return retval; |
| 342 | } |
| 343 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 344 | static unsigned int get_cur_freq_on_cpu(unsigned int cpu) |
| 345 | { |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 346 | struct acpi_cpufreq_data *data = per_cpu(drv_data, cpu); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 347 | unsigned int freq; |
Venkatesh Pallipadi | e56a727 | 2008-04-28 15:13:43 -0400 | [diff] [blame] | 348 | unsigned int cached_freq; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 349 | |
| 350 | dprintk("get_cur_freq_on_cpu (%d)\n", cpu); |
| 351 | |
| 352 | if (unlikely(data == NULL || |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 353 | data->acpi_data == NULL || data->freq_table == NULL)) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 354 | return 0; |
| 355 | } |
| 356 | |
Venkatesh Pallipadi | e56a727 | 2008-04-28 15:13:43 -0400 | [diff] [blame] | 357 | cached_freq = data->freq_table[data->acpi_data->state].frequency; |
Mike Travis | e39ad41 | 2009-01-04 05:18:10 -0800 | [diff] [blame^] | 358 | freq = extract_freq(get_cur_val(cpumask_of(cpu)), data); |
Venkatesh Pallipadi | e56a727 | 2008-04-28 15:13:43 -0400 | [diff] [blame] | 359 | if (freq != cached_freq) { |
| 360 | /* |
| 361 | * The dreaded BIOS frequency change behind our back. |
| 362 | * Force set the frequency on next target call. |
| 363 | */ |
| 364 | data->resume = 1; |
| 365 | } |
| 366 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 367 | dprintk("cur freq = %u\n", freq); |
| 368 | |
| 369 | return freq; |
| 370 | } |
| 371 | |
Mike Travis | fc0e474 | 2008-04-04 18:11:05 -0700 | [diff] [blame] | 372 | static unsigned int check_freqs(const cpumask_t *mask, unsigned int freq, |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 373 | struct acpi_cpufreq_data *data) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 374 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 375 | unsigned int cur_freq; |
| 376 | unsigned int i; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 377 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 378 | for (i=0; i<100; i++) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 379 | cur_freq = extract_freq(get_cur_val(mask), data); |
| 380 | if (cur_freq == freq) |
| 381 | return 1; |
| 382 | udelay(10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | } |
| 384 | return 0; |
| 385 | } |
| 386 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 387 | static int acpi_cpufreq_target(struct cpufreq_policy *policy, |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 388 | unsigned int target_freq, unsigned int relation) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | { |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 390 | struct acpi_cpufreq_data *data = per_cpu(drv_data, policy->cpu); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 391 | struct acpi_processor_performance *perf; |
| 392 | struct cpufreq_freqs freqs; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 393 | struct drv_cmd cmd; |
Venkatesh Pallipadi | 8edc59d9 | 2006-12-19 12:58:55 -0800 | [diff] [blame] | 394 | unsigned int next_state = 0; /* Index into freq_table */ |
| 395 | unsigned int next_perf_state = 0; /* Index into perf table */ |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 396 | unsigned int i; |
| 397 | int result = 0; |
Arjan van de Ven | f3f47a6 | 2008-11-23 16:49:58 -0800 | [diff] [blame] | 398 | struct power_trace it; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 400 | dprintk("acpi_cpufreq_target %d (%d)\n", target_freq, policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 402 | if (unlikely(data == NULL || |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 403 | data->acpi_data == NULL || data->freq_table == NULL)) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 404 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | } |
| 406 | |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 407 | if (unlikely(!alloc_cpumask_var(&cmd.mask, GFP_KERNEL))) |
| 408 | return -ENOMEM; |
| 409 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 410 | perf = data->acpi_data; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 411 | result = cpufreq_frequency_table_target(policy, |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 412 | data->freq_table, |
| 413 | target_freq, |
| 414 | relation, &next_state); |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 415 | if (unlikely(result)) { |
| 416 | result = -ENODEV; |
| 417 | goto out; |
| 418 | } |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 419 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 420 | next_perf_state = data->freq_table[next_state].index; |
Venkatesh Pallipadi | 7650b28 | 2006-10-03 12:36:30 -0700 | [diff] [blame] | 421 | if (perf->state == next_perf_state) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 422 | if (unlikely(data->resume)) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 423 | dprintk("Called after resume, resetting to P%d\n", |
| 424 | next_perf_state); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 425 | data->resume = 0; |
| 426 | } else { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 427 | dprintk("Already at target state (P%d)\n", |
| 428 | next_perf_state); |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 429 | goto out; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 430 | } |
| 431 | } |
| 432 | |
Arjan van de Ven | f3f47a6 | 2008-11-23 16:49:58 -0800 | [diff] [blame] | 433 | trace_power_mark(&it, POWER_PSTATE, next_perf_state); |
| 434 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 435 | switch (data->cpu_feature) { |
| 436 | case SYSTEM_INTEL_MSR_CAPABLE: |
| 437 | cmd.type = SYSTEM_INTEL_MSR_CAPABLE; |
| 438 | cmd.addr.msr.reg = MSR_IA32_PERF_CTL; |
Venki Pallipadi | 13424f6 | 2007-05-23 15:42:13 -0700 | [diff] [blame] | 439 | cmd.val = (u32) perf->states[next_perf_state].control; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 440 | break; |
| 441 | case SYSTEM_IO_CAPABLE: |
| 442 | cmd.type = SYSTEM_IO_CAPABLE; |
| 443 | cmd.addr.io.port = perf->control_register.address; |
| 444 | cmd.addr.io.bit_width = perf->control_register.bit_width; |
| 445 | cmd.val = (u32) perf->states[next_perf_state].control; |
| 446 | break; |
| 447 | default: |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 448 | result = -ENODEV; |
| 449 | goto out; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 450 | } |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 451 | |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 452 | /* cpufreq holds the hotplug lock, so we are safe from here on */ |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 453 | if (policy->shared_type != CPUFREQ_SHARED_TYPE_ANY) |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 454 | cpumask_and(cmd.mask, cpu_online_mask, policy->cpus); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 455 | else |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 456 | cpumask_copy(cmd.mask, cpumask_of(policy->cpu)); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 457 | |
Venkatesh Pallipadi | 8edc59d9 | 2006-12-19 12:58:55 -0800 | [diff] [blame] | 458 | freqs.old = perf->states[perf->state].core_frequency * 1000; |
| 459 | freqs.new = data->freq_table[next_state].frequency; |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 460 | for_each_cpu(i, cmd.mask) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 461 | freqs.cpu = i; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 462 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); |
| 463 | } |
| 464 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 465 | drv_write(&cmd); |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 466 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 467 | if (acpi_pstate_strict) { |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 468 | if (!check_freqs(cmd.mask, freqs.new, data)) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 469 | dprintk("acpi_cpufreq_target failed (%d)\n", |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 470 | policy->cpu); |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 471 | result = -EAGAIN; |
| 472 | goto out; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 473 | } |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 474 | } |
| 475 | |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 476 | for_each_cpu(i, cmd.mask) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 477 | freqs.cpu = i; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 478 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); |
| 479 | } |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 480 | perf->state = next_perf_state; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 481 | |
Mike Travis | 4d8bb53 | 2009-01-04 05:18:08 -0800 | [diff] [blame] | 482 | out: |
| 483 | free_cpumask_var(cmd.mask); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 484 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | } |
| 486 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 487 | static int acpi_cpufreq_verify(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | { |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 489 | struct acpi_cpufreq_data *data = per_cpu(drv_data, policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | |
| 491 | dprintk("acpi_cpufreq_verify\n"); |
| 492 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 493 | return cpufreq_frequency_table_verify(policy, data->freq_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | } |
| 495 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | static unsigned long |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 497 | acpi_cpufreq_guess_freq(struct acpi_cpufreq_data *data, unsigned int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 499 | struct acpi_processor_performance *perf = data->acpi_data; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 500 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | if (cpu_khz) { |
| 502 | /* search the closest match to cpu_khz */ |
| 503 | unsigned int i; |
| 504 | unsigned long freq; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 505 | unsigned long freqn = perf->states[0].core_frequency * 1000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 507 | for (i=0; i<(perf->state_count-1); i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | freq = freqn; |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 509 | freqn = perf->states[i+1].core_frequency * 1000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | if ((2 * cpu_khz) > (freqn + freq)) { |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 511 | perf->state = i; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 512 | return freq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | } |
| 514 | } |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 515 | perf->state = perf->state_count-1; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 516 | return freqn; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 517 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | /* assume CPU is at P0... */ |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 519 | perf->state = 0; |
| 520 | return perf->states[0].core_frequency * 1000; |
| 521 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | } |
| 523 | |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 524 | static void free_acpi_perf_data(void) |
| 525 | { |
| 526 | unsigned int i; |
| 527 | |
| 528 | /* Freeing a NULL pointer is OK, and alloc_percpu zeroes. */ |
| 529 | for_each_possible_cpu(i) |
| 530 | free_cpumask_var(per_cpu_ptr(acpi_perf_data, i) |
| 531 | ->shared_cpu_map); |
| 532 | free_percpu(acpi_perf_data); |
| 533 | } |
| 534 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 535 | /* |
| 536 | * acpi_cpufreq_early_init - initialize ACPI P-States library |
| 537 | * |
| 538 | * Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c) |
| 539 | * in order to determine correct frequency and voltage pairings. We can |
| 540 | * do _PDC and _PSD and find out the processor dependency for the |
| 541 | * actual init that will happen later... |
| 542 | */ |
Fenghua Yu | 5010929 | 2007-08-07 18:40:30 -0400 | [diff] [blame] | 543 | static int __init acpi_cpufreq_early_init(void) |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 544 | { |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 545 | unsigned int i; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 546 | dprintk("acpi_cpufreq_early_init\n"); |
| 547 | |
Fenghua Yu | 5010929 | 2007-08-07 18:40:30 -0400 | [diff] [blame] | 548 | acpi_perf_data = alloc_percpu(struct acpi_processor_performance); |
| 549 | if (!acpi_perf_data) { |
| 550 | dprintk("Memory allocation error for acpi_perf_data.\n"); |
| 551 | return -ENOMEM; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 552 | } |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 553 | for_each_possible_cpu(i) { |
Mike Travis | 80855f7 | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 554 | if (!alloc_cpumask_var_node( |
| 555 | &per_cpu_ptr(acpi_perf_data, i)->shared_cpu_map, |
| 556 | GFP_KERNEL, cpu_to_node(i))) { |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 557 | |
| 558 | /* Freeing a NULL pointer is OK: alloc_percpu zeroes. */ |
| 559 | free_acpi_perf_data(); |
| 560 | return -ENOMEM; |
| 561 | } |
| 562 | } |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 563 | |
| 564 | /* Do initialization in ACPI core */ |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 565 | acpi_processor_preregister_performance(acpi_perf_data); |
| 566 | return 0; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 567 | } |
| 568 | |
Dave Jones | 95625b8 | 2006-10-21 01:37:39 -0400 | [diff] [blame] | 569 | #ifdef CONFIG_SMP |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 570 | /* |
| 571 | * Some BIOSes do SW_ANY coordination internally, either set it up in hw |
| 572 | * or do it in BIOS firmware and won't inform about it to OS. If not |
| 573 | * detected, this has a side effect of making CPU run at a different speed |
| 574 | * than OS intended it to run at. Detect it and handle it cleanly. |
| 575 | */ |
| 576 | static int bios_with_sw_any_bug; |
| 577 | |
Jeff Garzik | 1855256 | 2007-10-03 15:15:40 -0400 | [diff] [blame] | 578 | static int sw_any_bug_found(const struct dmi_system_id *d) |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 579 | { |
| 580 | bios_with_sw_any_bug = 1; |
| 581 | return 0; |
| 582 | } |
| 583 | |
Jeff Garzik | 1855256 | 2007-10-03 15:15:40 -0400 | [diff] [blame] | 584 | static const struct dmi_system_id sw_any_bug_dmi_table[] = { |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 585 | { |
| 586 | .callback = sw_any_bug_found, |
| 587 | .ident = "Supermicro Server X6DLP", |
| 588 | .matches = { |
| 589 | DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"), |
| 590 | DMI_MATCH(DMI_BIOS_VERSION, "080010"), |
| 591 | DMI_MATCH(DMI_PRODUCT_NAME, "X6DLP"), |
| 592 | }, |
| 593 | }, |
| 594 | { } |
| 595 | }; |
Dave Jones | 95625b8 | 2006-10-21 01:37:39 -0400 | [diff] [blame] | 596 | #endif |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 597 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 598 | static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 600 | unsigned int i; |
| 601 | unsigned int valid_states = 0; |
| 602 | unsigned int cpu = policy->cpu; |
| 603 | struct acpi_cpufreq_data *data; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 604 | unsigned int result = 0; |
Mike Travis | 92cb761 | 2007-10-19 20:35:04 +0200 | [diff] [blame] | 605 | struct cpuinfo_x86 *c = &cpu_data(policy->cpu); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 606 | struct acpi_processor_performance *perf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | dprintk("acpi_cpufreq_cpu_init\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 610 | data = kzalloc(sizeof(struct acpi_cpufreq_data), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | if (!data) |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 612 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | |
Fenghua Yu | 5010929 | 2007-08-07 18:40:30 -0400 | [diff] [blame] | 614 | data->acpi_data = percpu_ptr(acpi_perf_data, cpu); |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 615 | per_cpu(drv_data, cpu) = data; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 616 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 617 | if (cpu_has(c, X86_FEATURE_CONSTANT_TSC)) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 618 | acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 620 | result = acpi_processor_register_performance(data->acpi_data, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | if (result) |
| 622 | goto err_free; |
| 623 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 624 | perf = data->acpi_data; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 625 | policy->shared_type = perf->shared_type; |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 626 | |
Venkatesh Pallipadi | 46f18e3 | 2006-06-26 00:34:43 -0400 | [diff] [blame] | 627 | /* |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 628 | * Will let policy->cpus know about dependency only when software |
Venkatesh Pallipadi | 46f18e3 | 2006-06-26 00:34:43 -0400 | [diff] [blame] | 629 | * coordination is required. |
| 630 | */ |
| 631 | if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL || |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 632 | policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) { |
Rusty Russell | 835481d | 2009-01-04 05:18:06 -0800 | [diff] [blame] | 633 | cpumask_copy(policy->cpus, perf->shared_cpu_map); |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 634 | } |
Rusty Russell | 835481d | 2009-01-04 05:18:06 -0800 | [diff] [blame] | 635 | cpumask_copy(policy->related_cpus, perf->shared_cpu_map); |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 636 | |
| 637 | #ifdef CONFIG_SMP |
| 638 | dmi_check_system(sw_any_bug_dmi_table); |
Rusty Russell | 835481d | 2009-01-04 05:18:06 -0800 | [diff] [blame] | 639 | if (bios_with_sw_any_bug && cpumask_weight(policy->cpus) == 1) { |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 640 | policy->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
Rusty Russell | 835481d | 2009-01-04 05:18:06 -0800 | [diff] [blame] | 641 | cpumask_copy(policy->cpus, cpu_core_mask(cpu)); |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 642 | } |
| 643 | #endif |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 644 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | /* capability check */ |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 646 | if (perf->state_count <= 1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | dprintk("No P-States\n"); |
| 648 | result = -ENODEV; |
| 649 | goto err_unreg; |
| 650 | } |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 651 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 652 | if (perf->control_register.space_id != perf->status_register.space_id) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | result = -ENODEV; |
| 654 | goto err_unreg; |
| 655 | } |
| 656 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 657 | switch (perf->control_register.space_id) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 658 | case ACPI_ADR_SPACE_SYSTEM_IO: |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 659 | dprintk("SYSTEM IO addr space\n"); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 660 | data->cpu_feature = SYSTEM_IO_CAPABLE; |
| 661 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 662 | case ACPI_ADR_SPACE_FIXED_HARDWARE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 663 | dprintk("HARDWARE addr space\n"); |
| 664 | if (!check_est_cpu(cpu)) { |
| 665 | result = -ENODEV; |
| 666 | goto err_unreg; |
| 667 | } |
| 668 | data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 669 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 670 | default: |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 671 | dprintk("Unknown addr space %d\n", |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 672 | (u32) (perf->control_register.space_id)); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 673 | result = -ENODEV; |
| 674 | goto err_unreg; |
| 675 | } |
| 676 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 677 | data->freq_table = kmalloc(sizeof(struct cpufreq_frequency_table) * |
| 678 | (perf->state_count+1), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | if (!data->freq_table) { |
| 680 | result = -ENOMEM; |
| 681 | goto err_unreg; |
| 682 | } |
| 683 | |
| 684 | /* detect transition latency */ |
| 685 | policy->cpuinfo.transition_latency = 0; |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 686 | for (i=0; i<perf->state_count; i++) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 687 | if ((perf->states[i].transition_latency * 1000) > |
| 688 | policy->cpuinfo.transition_latency) |
| 689 | policy->cpuinfo.transition_latency = |
| 690 | perf->states[i].transition_latency * 1000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 693 | data->max_freq = perf->states[0].core_frequency * 1000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | /* table init */ |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 695 | for (i=0; i<perf->state_count; i++) { |
Zhang Rui | 3cdf552 | 2007-06-13 21:24:02 -0400 | [diff] [blame] | 696 | if (i>0 && perf->states[i].core_frequency >= |
| 697 | data->freq_table[valid_states-1].frequency / 1000) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 698 | continue; |
| 699 | |
| 700 | data->freq_table[valid_states].index = i; |
| 701 | data->freq_table[valid_states].frequency = |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 702 | perf->states[i].core_frequency * 1000; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 703 | valid_states++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | } |
Venkatesh Pallipadi | 3d4a7ef | 2006-11-13 17:47:44 -0800 | [diff] [blame] | 705 | data->freq_table[valid_states].frequency = CPUFREQ_TABLE_END; |
Venkatesh Pallipadi | 8edc59d9 | 2006-12-19 12:58:55 -0800 | [diff] [blame] | 706 | perf->state = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | |
| 708 | result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table); |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 709 | if (result) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | goto err_freqfree; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | |
Mattia Dongili | a507ac4 | 2006-12-15 19:52:45 +0100 | [diff] [blame] | 712 | switch (perf->control_register.space_id) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 713 | case ACPI_ADR_SPACE_SYSTEM_IO: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 714 | /* Current speed is unknown and not detectable by IO port */ |
| 715 | policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu); |
| 716 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 717 | case ACPI_ADR_SPACE_FIXED_HARDWARE: |
Venkatesh Pallipadi | 7650b28 | 2006-10-03 12:36:30 -0700 | [diff] [blame] | 718 | acpi_cpufreq_driver.get = get_cur_freq_on_cpu; |
Mattia Dongili | a507ac4 | 2006-12-15 19:52:45 +0100 | [diff] [blame] | 719 | policy->cur = get_cur_freq_on_cpu(cpu); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 720 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 721 | default: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 722 | break; |
| 723 | } |
| 724 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | /* notify BIOS that we exist */ |
| 726 | acpi_processor_notify_smm(THIS_MODULE); |
| 727 | |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 728 | /* Check for APERF/MPERF support in hardware */ |
| 729 | if (c->x86_vendor == X86_VENDOR_INTEL && c->cpuid_level >= 6) { |
| 730 | unsigned int ecx; |
| 731 | ecx = cpuid_ecx(6); |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 732 | if (ecx & CPUID_6_ECX_APERFMPERF_CAPABILITY) |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 733 | acpi_cpufreq_driver.getavg = get_measured_perf; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 734 | } |
| 735 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 736 | dprintk("CPU%u - ACPI performance management activated.\n", cpu); |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 737 | for (i = 0; i < perf->state_count; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | dprintk(" %cP%d: %d MHz, %d mW, %d uS\n", |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 739 | (i == perf->state ? '*' : ' '), i, |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 740 | (u32) perf->states[i].core_frequency, |
| 741 | (u32) perf->states[i].power, |
| 742 | (u32) perf->states[i].transition_latency); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | |
| 744 | cpufreq_frequency_table_get_attr(data->freq_table, policy->cpu); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 745 | |
Dominik Brodowski | 4b31e77 | 2005-05-18 13:49:00 -0400 | [diff] [blame] | 746 | /* |
| 747 | * the first call to ->target() should result in us actually |
| 748 | * writing something to the appropriate registers. |
| 749 | */ |
| 750 | data->resume = 1; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 751 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 752 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 754 | err_freqfree: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | kfree(data->freq_table); |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 756 | err_unreg: |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 757 | acpi_processor_unregister_performance(perf, cpu); |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 758 | err_free: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | kfree(data); |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 760 | per_cpu(drv_data, cpu) = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 762 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | } |
| 764 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 765 | static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | { |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 767 | struct acpi_cpufreq_data *data = per_cpu(drv_data, policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | dprintk("acpi_cpufreq_cpu_exit\n"); |
| 770 | |
| 771 | if (data) { |
| 772 | cpufreq_frequency_table_put_attr(policy->cpu); |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 773 | per_cpu(drv_data, policy->cpu) = NULL; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 774 | acpi_processor_unregister_performance(data->acpi_data, |
| 775 | policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | kfree(data); |
| 777 | } |
| 778 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 779 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | } |
| 781 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 782 | static int acpi_cpufreq_resume(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | { |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 784 | struct acpi_cpufreq_data *data = per_cpu(drv_data, policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | dprintk("acpi_cpufreq_resume\n"); |
| 787 | |
| 788 | data->resume = 1; |
| 789 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 790 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | } |
| 792 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 793 | static struct freq_attr *acpi_cpufreq_attr[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | &cpufreq_freq_attr_scaling_available_freqs, |
| 795 | NULL, |
| 796 | }; |
| 797 | |
| 798 | static struct cpufreq_driver acpi_cpufreq_driver = { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 799 | .verify = acpi_cpufreq_verify, |
| 800 | .target = acpi_cpufreq_target, |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 801 | .init = acpi_cpufreq_cpu_init, |
| 802 | .exit = acpi_cpufreq_cpu_exit, |
| 803 | .resume = acpi_cpufreq_resume, |
| 804 | .name = "acpi-cpufreq", |
| 805 | .owner = THIS_MODULE, |
| 806 | .attr = acpi_cpufreq_attr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | }; |
| 808 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 809 | static int __init acpi_cpufreq_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | { |
Fenghua Yu | 5010929 | 2007-08-07 18:40:30 -0400 | [diff] [blame] | 811 | int ret; |
| 812 | |
Yinghai Lu | ee29753 | 2008-09-24 19:04:31 -0700 | [diff] [blame] | 813 | if (acpi_disabled) |
| 814 | return 0; |
| 815 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | dprintk("acpi_cpufreq_init\n"); |
| 817 | |
Fenghua Yu | 5010929 | 2007-08-07 18:40:30 -0400 | [diff] [blame] | 818 | ret = acpi_cpufreq_early_init(); |
| 819 | if (ret) |
| 820 | return ret; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 821 | |
Akinobu Mita | 847aef6 | 2008-07-14 11:59:44 +0900 | [diff] [blame] | 822 | ret = cpufreq_register_driver(&acpi_cpufreq_driver); |
| 823 | if (ret) |
Rusty Russell | 2fdf66b | 2008-12-31 18:08:47 -0800 | [diff] [blame] | 824 | free_acpi_perf_data(); |
Akinobu Mita | 847aef6 | 2008-07-14 11:59:44 +0900 | [diff] [blame] | 825 | |
| 826 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | } |
| 828 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 829 | static void __exit acpi_cpufreq_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | { |
| 831 | dprintk("acpi_cpufreq_exit\n"); |
| 832 | |
| 833 | cpufreq_unregister_driver(&acpi_cpufreq_driver); |
| 834 | |
Fenghua Yu | 5010929 | 2007-08-07 18:40:30 -0400 | [diff] [blame] | 835 | free_percpu(acpi_perf_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | } |
| 837 | |
Venkatesh Pallipadi | d395bf1 | 2005-08-25 15:59:00 -0400 | [diff] [blame] | 838 | module_param(acpi_pstate_strict, uint, 0644); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 839 | MODULE_PARM_DESC(acpi_pstate_strict, |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 840 | "value 0 or non-zero. non-zero -> strict ACPI checks are " |
| 841 | "performed during frequency changes."); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | |
| 843 | late_initcall(acpi_cpufreq_init); |
| 844 | module_exit(acpi_cpufreq_exit); |
| 845 | |
| 846 | MODULE_ALIAS("acpi"); |