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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | |
| 37 | #include <linux/acpi.h> |
| 38 | #include <acpi/processor.h> |
| 39 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 40 | #include <asm/io.h> |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 41 | #include <asm/msr.h> |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 42 | #include <asm/processor.h> |
| 43 | #include <asm/cpufeature.h> |
| 44 | #include <asm/delay.h> |
| 45 | #include <asm/uaccess.h> |
| 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "acpi-cpufreq", msg) |
| 48 | |
| 49 | MODULE_AUTHOR("Paul Diefenbaugh, Dominik Brodowski"); |
| 50 | MODULE_DESCRIPTION("ACPI Processor P-States Driver"); |
| 51 | MODULE_LICENSE("GPL"); |
| 52 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 53 | enum { |
| 54 | UNDEFINED_CAPABLE = 0, |
| 55 | SYSTEM_INTEL_MSR_CAPABLE, |
| 56 | SYSTEM_IO_CAPABLE, |
| 57 | }; |
| 58 | |
| 59 | #define INTEL_MSR_RANGE (0xffff) |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 60 | #define CPUID_6_ECX_APERFMPERF_CAPABILITY (0x1) |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 61 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 62 | struct acpi_cpufreq_data { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 63 | struct acpi_processor_performance *acpi_data; |
| 64 | struct cpufreq_frequency_table *freq_table; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 65 | unsigned int max_freq; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 66 | unsigned int resume; |
| 67 | unsigned int cpu_feature; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | }; |
| 69 | |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 70 | static DEFINE_PER_CPU(struct acpi_cpufreq_data *, drv_data); |
| 71 | |
Fenghua Yu | 5010929 | 2007-08-07 18:40:30 -0400 | [diff] [blame] | 72 | /* acpi_perf_data is a pointer to percpu data. */ |
| 73 | static struct acpi_processor_performance *acpi_perf_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | |
| 75 | static struct cpufreq_driver acpi_cpufreq_driver; |
| 76 | |
Venkatesh Pallipadi | d395bf1 | 2005-08-25 15:59:00 -0400 | [diff] [blame] | 77 | static unsigned int acpi_pstate_strict; |
| 78 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 79 | static int check_est_cpu(unsigned int cpuid) |
| 80 | { |
Mike Travis | 92cb761 | 2007-10-19 20:35:04 +0200 | [diff] [blame] | 81 | struct cpuinfo_x86 *cpu = &cpu_data(cpuid); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 82 | |
| 83 | if (cpu->x86_vendor != X86_VENDOR_INTEL || |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 84 | !cpu_has(cpu, X86_FEATURE_EST)) |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 85 | return 0; |
| 86 | |
| 87 | return 1; |
| 88 | } |
| 89 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 90 | static unsigned extract_io(u32 value, struct acpi_cpufreq_data *data) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 91 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 92 | struct acpi_processor_performance *perf; |
| 93 | int i; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 94 | |
| 95 | perf = data->acpi_data; |
| 96 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 97 | for (i=0; i<perf->state_count; i++) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 98 | if (value == perf->states[i].status) |
| 99 | return data->freq_table[i].frequency; |
| 100 | } |
| 101 | return 0; |
| 102 | } |
| 103 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 104 | static unsigned extract_msr(u32 msr, struct acpi_cpufreq_data *data) |
| 105 | { |
| 106 | int i; |
Venkatesh Pallipadi | a6f6e6e6 | 2006-10-03 12:37:42 -0700 | [diff] [blame] | 107 | struct acpi_processor_performance *perf; |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 108 | |
| 109 | msr &= INTEL_MSR_RANGE; |
Venkatesh Pallipadi | a6f6e6e6 | 2006-10-03 12:37:42 -0700 | [diff] [blame] | 110 | perf = data->acpi_data; |
| 111 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 112 | for (i=0; data->freq_table[i].frequency != CPUFREQ_TABLE_END; i++) { |
Venkatesh Pallipadi | a6f6e6e6 | 2006-10-03 12:37:42 -0700 | [diff] [blame] | 113 | if (msr == perf->states[data->freq_table[i].index].status) |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 114 | return data->freq_table[i].frequency; |
| 115 | } |
| 116 | return data->freq_table[0].frequency; |
| 117 | } |
| 118 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 119 | static unsigned extract_freq(u32 val, struct acpi_cpufreq_data *data) |
| 120 | { |
| 121 | switch (data->cpu_feature) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 122 | case SYSTEM_INTEL_MSR_CAPABLE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 123 | return extract_msr(val, data); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 124 | case SYSTEM_IO_CAPABLE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 125 | return extract_io(val, data); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 126 | default: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 127 | return 0; |
| 128 | } |
| 129 | } |
| 130 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 131 | struct msr_addr { |
| 132 | u32 reg; |
| 133 | }; |
| 134 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 135 | struct io_addr { |
| 136 | u16 port; |
| 137 | u8 bit_width; |
| 138 | }; |
| 139 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 140 | typedef union { |
| 141 | struct msr_addr msr; |
| 142 | struct io_addr io; |
| 143 | } drv_addr_union; |
| 144 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 145 | struct drv_cmd { |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 146 | unsigned int type; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 147 | cpumask_t mask; |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 148 | drv_addr_union addr; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 149 | u32 val; |
| 150 | }; |
| 151 | |
| 152 | static void do_drv_read(struct drv_cmd *cmd) |
| 153 | { |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 154 | u32 h; |
| 155 | |
| 156 | switch (cmd->type) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 157 | case SYSTEM_INTEL_MSR_CAPABLE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 158 | rdmsr(cmd->addr.msr.reg, cmd->val, h); |
| 159 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 160 | case SYSTEM_IO_CAPABLE: |
Venkatesh Pallipadi | 4e581ff | 2006-12-13 10:41:16 -0800 | [diff] [blame] | 161 | acpi_os_read_port((acpi_io_address)cmd->addr.io.port, |
| 162 | &cmd->val, |
| 163 | (u32)cmd->addr.io.bit_width); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 164 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 165 | default: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 166 | break; |
| 167 | } |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 168 | } |
| 169 | |
| 170 | static void do_drv_write(struct drv_cmd *cmd) |
| 171 | { |
Venki Pallipadi | 13424f6 | 2007-05-23 15:42:13 -0700 | [diff] [blame] | 172 | u32 lo, hi; |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 173 | |
| 174 | switch (cmd->type) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 175 | case SYSTEM_INTEL_MSR_CAPABLE: |
Venki Pallipadi | 13424f6 | 2007-05-23 15:42:13 -0700 | [diff] [blame] | 176 | rdmsr(cmd->addr.msr.reg, lo, hi); |
| 177 | lo = (lo & ~INTEL_MSR_RANGE) | (cmd->val & INTEL_MSR_RANGE); |
| 178 | wrmsr(cmd->addr.msr.reg, lo, hi); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 179 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 180 | case SYSTEM_IO_CAPABLE: |
Venkatesh Pallipadi | 4e581ff | 2006-12-13 10:41:16 -0800 | [diff] [blame] | 181 | acpi_os_write_port((acpi_io_address)cmd->addr.io.port, |
| 182 | cmd->val, |
| 183 | (u32)cmd->addr.io.bit_width); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 184 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 185 | default: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 186 | break; |
| 187 | } |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 188 | } |
| 189 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 190 | static void drv_read(struct drv_cmd *cmd) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 191 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 192 | cpumask_t saved_mask = current->cpus_allowed; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 193 | cmd->val = 0; |
| 194 | |
Mike Travis | fc0e474 | 2008-04-04 18:11:05 -0700 | [diff] [blame] | 195 | set_cpus_allowed_ptr(current, &cmd->mask); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 196 | do_drv_read(cmd); |
Mike Travis | fc0e474 | 2008-04-04 18:11:05 -0700 | [diff] [blame] | 197 | set_cpus_allowed_ptr(current, &saved_mask); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 198 | } |
| 199 | |
| 200 | static void drv_write(struct drv_cmd *cmd) |
| 201 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 202 | cpumask_t saved_mask = current->cpus_allowed; |
| 203 | unsigned int i; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 204 | |
Mike Travis | 334ef7a | 2008-05-12 21:21:13 +0200 | [diff] [blame] | 205 | for_each_cpu_mask_nr(i, cmd->mask) { |
Mike Travis | 0bc3cc0 | 2008-07-24 18:21:31 -0700 | [diff] [blame] | 206 | set_cpus_allowed_ptr(current, &cpumask_of_cpu(i)); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 207 | do_drv_write(cmd); |
| 208 | } |
| 209 | |
Mike Travis | fc0e474 | 2008-04-04 18:11:05 -0700 | [diff] [blame] | 210 | set_cpus_allowed_ptr(current, &saved_mask); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 211 | return; |
| 212 | } |
| 213 | |
Mike Travis | fc0e474 | 2008-04-04 18:11:05 -0700 | [diff] [blame] | 214 | static u32 get_cur_val(const cpumask_t *mask) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 215 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 216 | struct acpi_processor_performance *perf; |
| 217 | struct drv_cmd cmd; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 218 | |
Mike Travis | fc0e474 | 2008-04-04 18:11:05 -0700 | [diff] [blame] | 219 | if (unlikely(cpus_empty(*mask))) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 220 | return 0; |
| 221 | |
Mike Travis | fc0e474 | 2008-04-04 18:11:05 -0700 | [diff] [blame] | 222 | switch (per_cpu(drv_data, first_cpu(*mask))->cpu_feature) { |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 223 | case SYSTEM_INTEL_MSR_CAPABLE: |
| 224 | cmd.type = SYSTEM_INTEL_MSR_CAPABLE; |
| 225 | cmd.addr.msr.reg = MSR_IA32_PERF_STATUS; |
| 226 | break; |
| 227 | case SYSTEM_IO_CAPABLE: |
| 228 | cmd.type = SYSTEM_IO_CAPABLE; |
Mike Travis | fc0e474 | 2008-04-04 18:11:05 -0700 | [diff] [blame] | 229 | perf = per_cpu(drv_data, first_cpu(*mask))->acpi_data; |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 230 | cmd.addr.io.port = perf->control_register.address; |
| 231 | cmd.addr.io.bit_width = perf->control_register.bit_width; |
| 232 | break; |
| 233 | default: |
| 234 | return 0; |
| 235 | } |
| 236 | |
Mike Travis | fc0e474 | 2008-04-04 18:11:05 -0700 | [diff] [blame] | 237 | cmd.mask = *mask; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 238 | |
| 239 | drv_read(&cmd); |
| 240 | |
| 241 | dprintk("get_cur_val = %u\n", cmd.val); |
| 242 | |
| 243 | return cmd.val; |
| 244 | } |
| 245 | |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 246 | /* |
| 247 | * Return the measured active (C0) frequency on this CPU since last call |
| 248 | * to this function. |
| 249 | * Input: cpu number |
| 250 | * Return: Average CPU frequency in terms of max frequency (zero on error) |
| 251 | * |
| 252 | * We use IA32_MPERF and IA32_APERF MSRs to get the measured performance |
| 253 | * over a period of time, while CPU is in C0 state. |
| 254 | * IA32_MPERF counts at the rate of max advertised frequency |
| 255 | * IA32_APERF counts at the rate of actual CPU frequency |
| 256 | * Only IA32_APERF/IA32_MPERF ratio is architecturally defined and |
| 257 | * no meaning should be associated with absolute values of these MSRs. |
| 258 | */ |
| 259 | static unsigned int get_measured_perf(unsigned int cpu) |
| 260 | { |
| 261 | union { |
| 262 | struct { |
| 263 | u32 lo; |
| 264 | u32 hi; |
| 265 | } split; |
| 266 | u64 whole; |
| 267 | } aperf_cur, mperf_cur; |
| 268 | |
| 269 | cpumask_t saved_mask; |
| 270 | unsigned int perf_percent; |
| 271 | unsigned int retval; |
| 272 | |
| 273 | saved_mask = current->cpus_allowed; |
Mike Travis | 0bc3cc0 | 2008-07-24 18:21:31 -0700 | [diff] [blame] | 274 | set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu)); |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 275 | if (get_cpu() != cpu) { |
| 276 | /* We were not able to run on requested processor */ |
| 277 | put_cpu(); |
| 278 | return 0; |
| 279 | } |
| 280 | |
| 281 | rdmsr(MSR_IA32_APERF, aperf_cur.split.lo, aperf_cur.split.hi); |
| 282 | rdmsr(MSR_IA32_MPERF, mperf_cur.split.lo, mperf_cur.split.hi); |
| 283 | |
| 284 | wrmsr(MSR_IA32_APERF, 0,0); |
| 285 | wrmsr(MSR_IA32_MPERF, 0,0); |
| 286 | |
| 287 | #ifdef __i386__ |
| 288 | /* |
| 289 | * We dont want to do 64 bit divide with 32 bit kernel |
| 290 | * Get an approximate value. Return failure in case we cannot get |
| 291 | * an approximate value. |
| 292 | */ |
| 293 | if (unlikely(aperf_cur.split.hi || mperf_cur.split.hi)) { |
| 294 | int shift_count; |
| 295 | u32 h; |
| 296 | |
| 297 | h = max_t(u32, aperf_cur.split.hi, mperf_cur.split.hi); |
| 298 | shift_count = fls(h); |
| 299 | |
| 300 | aperf_cur.whole >>= shift_count; |
| 301 | mperf_cur.whole >>= shift_count; |
| 302 | } |
| 303 | |
| 304 | if (((unsigned long)(-1) / 100) < aperf_cur.split.lo) { |
| 305 | int shift_count = 7; |
| 306 | aperf_cur.split.lo >>= shift_count; |
| 307 | mperf_cur.split.lo >>= shift_count; |
| 308 | } |
| 309 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 310 | if (aperf_cur.split.lo && mperf_cur.split.lo) |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 311 | perf_percent = (aperf_cur.split.lo * 100) / mperf_cur.split.lo; |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 312 | else |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 313 | perf_percent = 0; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 314 | |
| 315 | #else |
| 316 | if (unlikely(((unsigned long)(-1) / 100) < aperf_cur.whole)) { |
| 317 | int shift_count = 7; |
| 318 | aperf_cur.whole >>= shift_count; |
| 319 | mperf_cur.whole >>= shift_count; |
| 320 | } |
| 321 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 322 | if (aperf_cur.whole && mperf_cur.whole) |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 323 | perf_percent = (aperf_cur.whole * 100) / mperf_cur.whole; |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 324 | else |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 325 | perf_percent = 0; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 326 | |
| 327 | #endif |
| 328 | |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 329 | retval = per_cpu(drv_data, cpu)->max_freq * perf_percent / 100; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 330 | |
| 331 | put_cpu(); |
Mike Travis | fc0e474 | 2008-04-04 18:11:05 -0700 | [diff] [blame] | 332 | set_cpus_allowed_ptr(current, &saved_mask); |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 333 | |
| 334 | dprintk("cpu %d: performance percent %d\n", cpu, perf_percent); |
| 335 | return retval; |
| 336 | } |
| 337 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 338 | static unsigned int get_cur_freq_on_cpu(unsigned int cpu) |
| 339 | { |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 340 | struct acpi_cpufreq_data *data = per_cpu(drv_data, cpu); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 341 | unsigned int freq; |
Venkatesh Pallipadi | e56a727 | 2008-04-28 15:13:43 -0400 | [diff] [blame] | 342 | unsigned int cached_freq; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 343 | |
| 344 | dprintk("get_cur_freq_on_cpu (%d)\n", cpu); |
| 345 | |
| 346 | if (unlikely(data == NULL || |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 347 | data->acpi_data == NULL || data->freq_table == NULL)) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 348 | return 0; |
| 349 | } |
| 350 | |
Venkatesh Pallipadi | e56a727 | 2008-04-28 15:13:43 -0400 | [diff] [blame] | 351 | cached_freq = data->freq_table[data->acpi_data->state].frequency; |
Mike Travis | 0bc3cc0 | 2008-07-24 18:21:31 -0700 | [diff] [blame] | 352 | freq = extract_freq(get_cur_val(&cpumask_of_cpu(cpu)), data); |
Venkatesh Pallipadi | e56a727 | 2008-04-28 15:13:43 -0400 | [diff] [blame] | 353 | if (freq != cached_freq) { |
| 354 | /* |
| 355 | * The dreaded BIOS frequency change behind our back. |
| 356 | * Force set the frequency on next target call. |
| 357 | */ |
| 358 | data->resume = 1; |
| 359 | } |
| 360 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 361 | dprintk("cur freq = %u\n", freq); |
| 362 | |
| 363 | return freq; |
| 364 | } |
| 365 | |
Mike Travis | fc0e474 | 2008-04-04 18:11:05 -0700 | [diff] [blame] | 366 | static unsigned int check_freqs(const cpumask_t *mask, unsigned int freq, |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 367 | struct acpi_cpufreq_data *data) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 368 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 369 | unsigned int cur_freq; |
| 370 | unsigned int i; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 371 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 372 | for (i=0; i<100; i++) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 373 | cur_freq = extract_freq(get_cur_val(mask), data); |
| 374 | if (cur_freq == freq) |
| 375 | return 1; |
| 376 | udelay(10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | } |
| 378 | return 0; |
| 379 | } |
| 380 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 381 | static int acpi_cpufreq_target(struct cpufreq_policy *policy, |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 382 | unsigned int target_freq, unsigned int relation) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | { |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 384 | struct acpi_cpufreq_data *data = per_cpu(drv_data, policy->cpu); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 385 | struct acpi_processor_performance *perf; |
| 386 | struct cpufreq_freqs freqs; |
| 387 | cpumask_t online_policy_cpus; |
| 388 | struct drv_cmd cmd; |
Venkatesh Pallipadi | 8edc59d9 | 2006-12-19 12:58:55 -0800 | [diff] [blame] | 389 | unsigned int next_state = 0; /* Index into freq_table */ |
| 390 | unsigned int next_perf_state = 0; /* Index into perf table */ |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 391 | unsigned int i; |
| 392 | int result = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 394 | dprintk("acpi_cpufreq_target %d (%d)\n", target_freq, policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 396 | if (unlikely(data == NULL || |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 397 | data->acpi_data == NULL || data->freq_table == NULL)) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 398 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | } |
| 400 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 401 | perf = data->acpi_data; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 402 | result = cpufreq_frequency_table_target(policy, |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 403 | data->freq_table, |
| 404 | target_freq, |
| 405 | relation, &next_state); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 406 | if (unlikely(result)) |
| 407 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | |
Andrew Morton | 7e1f19e | 2006-03-28 17:03:00 -0500 | [diff] [blame] | 409 | #ifdef CONFIG_HOTPLUG_CPU |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 410 | /* cpufreq holds the hotplug lock, so we are safe from here on */ |
| 411 | cpus_and(online_policy_cpus, cpu_online_map, policy->cpus); |
Andrew Morton | 7e1f19e | 2006-03-28 17:03:00 -0500 | [diff] [blame] | 412 | #else |
| 413 | online_policy_cpus = policy->cpus; |
| 414 | #endif |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 415 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 416 | next_perf_state = data->freq_table[next_state].index; |
Venkatesh Pallipadi | 7650b28 | 2006-10-03 12:36:30 -0700 | [diff] [blame] | 417 | if (perf->state == next_perf_state) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 418 | if (unlikely(data->resume)) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 419 | dprintk("Called after resume, resetting to P%d\n", |
| 420 | next_perf_state); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 421 | data->resume = 0; |
| 422 | } else { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 423 | dprintk("Already at target state (P%d)\n", |
| 424 | next_perf_state); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 425 | return 0; |
| 426 | } |
| 427 | } |
| 428 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 429 | switch (data->cpu_feature) { |
| 430 | case SYSTEM_INTEL_MSR_CAPABLE: |
| 431 | cmd.type = SYSTEM_INTEL_MSR_CAPABLE; |
| 432 | cmd.addr.msr.reg = MSR_IA32_PERF_CTL; |
Venki Pallipadi | 13424f6 | 2007-05-23 15:42:13 -0700 | [diff] [blame] | 433 | cmd.val = (u32) perf->states[next_perf_state].control; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 434 | break; |
| 435 | case SYSTEM_IO_CAPABLE: |
| 436 | cmd.type = SYSTEM_IO_CAPABLE; |
| 437 | cmd.addr.io.port = perf->control_register.address; |
| 438 | cmd.addr.io.bit_width = perf->control_register.bit_width; |
| 439 | cmd.val = (u32) perf->states[next_perf_state].control; |
| 440 | break; |
| 441 | default: |
| 442 | return -ENODEV; |
| 443 | } |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 444 | |
| 445 | cpus_clear(cmd.mask); |
| 446 | |
| 447 | if (policy->shared_type != CPUFREQ_SHARED_TYPE_ANY) |
| 448 | cmd.mask = online_policy_cpus; |
| 449 | else |
| 450 | cpu_set(policy->cpu, cmd.mask); |
| 451 | |
Venkatesh Pallipadi | 8edc59d9 | 2006-12-19 12:58:55 -0800 | [diff] [blame] | 452 | freqs.old = perf->states[perf->state].core_frequency * 1000; |
| 453 | freqs.new = data->freq_table[next_state].frequency; |
Mike Travis | 334ef7a | 2008-05-12 21:21:13 +0200 | [diff] [blame] | 454 | for_each_cpu_mask_nr(i, cmd.mask) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 455 | freqs.cpu = i; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 456 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); |
| 457 | } |
| 458 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 459 | drv_write(&cmd); |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 460 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 461 | if (acpi_pstate_strict) { |
Mike Travis | fc0e474 | 2008-04-04 18:11:05 -0700 | [diff] [blame] | 462 | if (!check_freqs(&cmd.mask, freqs.new, data)) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 463 | dprintk("acpi_cpufreq_target failed (%d)\n", |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 464 | policy->cpu); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 465 | return -EAGAIN; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 466 | } |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 467 | } |
| 468 | |
Mike Travis | 334ef7a | 2008-05-12 21:21:13 +0200 | [diff] [blame] | 469 | for_each_cpu_mask_nr(i, cmd.mask) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 470 | freqs.cpu = i; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 471 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); |
| 472 | } |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 473 | perf->state = next_perf_state; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 474 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 475 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | } |
| 477 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 478 | static int acpi_cpufreq_verify(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | { |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 480 | struct acpi_cpufreq_data *data = per_cpu(drv_data, policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | |
| 482 | dprintk("acpi_cpufreq_verify\n"); |
| 483 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 484 | return cpufreq_frequency_table_verify(policy, data->freq_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | } |
| 486 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | static unsigned long |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 488 | acpi_cpufreq_guess_freq(struct acpi_cpufreq_data *data, unsigned int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 490 | struct acpi_processor_performance *perf = data->acpi_data; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 491 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | if (cpu_khz) { |
| 493 | /* search the closest match to cpu_khz */ |
| 494 | unsigned int i; |
| 495 | unsigned long freq; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 496 | unsigned long freqn = perf->states[0].core_frequency * 1000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 498 | for (i=0; i<(perf->state_count-1); i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | freq = freqn; |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 500 | freqn = perf->states[i+1].core_frequency * 1000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | if ((2 * cpu_khz) > (freqn + freq)) { |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 502 | perf->state = i; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 503 | return freq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | } |
| 505 | } |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 506 | perf->state = perf->state_count-1; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 507 | return freqn; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 508 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | /* assume CPU is at P0... */ |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 510 | perf->state = 0; |
| 511 | return perf->states[0].core_frequency * 1000; |
| 512 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | } |
| 514 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 515 | /* |
| 516 | * acpi_cpufreq_early_init - initialize ACPI P-States library |
| 517 | * |
| 518 | * Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c) |
| 519 | * in order to determine correct frequency and voltage pairings. We can |
| 520 | * do _PDC and _PSD and find out the processor dependency for the |
| 521 | * actual init that will happen later... |
| 522 | */ |
Fenghua Yu | 5010929 | 2007-08-07 18:40:30 -0400 | [diff] [blame] | 523 | static int __init acpi_cpufreq_early_init(void) |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 524 | { |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 525 | dprintk("acpi_cpufreq_early_init\n"); |
| 526 | |
Fenghua Yu | 5010929 | 2007-08-07 18:40:30 -0400 | [diff] [blame] | 527 | acpi_perf_data = alloc_percpu(struct acpi_processor_performance); |
| 528 | if (!acpi_perf_data) { |
| 529 | dprintk("Memory allocation error for acpi_perf_data.\n"); |
| 530 | return -ENOMEM; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 531 | } |
| 532 | |
| 533 | /* Do initialization in ACPI core */ |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 534 | acpi_processor_preregister_performance(acpi_perf_data); |
| 535 | return 0; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 536 | } |
| 537 | |
Dave Jones | 95625b8 | 2006-10-21 01:37:39 -0400 | [diff] [blame] | 538 | #ifdef CONFIG_SMP |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 539 | /* |
| 540 | * Some BIOSes do SW_ANY coordination internally, either set it up in hw |
| 541 | * or do it in BIOS firmware and won't inform about it to OS. If not |
| 542 | * detected, this has a side effect of making CPU run at a different speed |
| 543 | * than OS intended it to run at. Detect it and handle it cleanly. |
| 544 | */ |
| 545 | static int bios_with_sw_any_bug; |
| 546 | |
Jeff Garzik | 1855256 | 2007-10-03 15:15:40 -0400 | [diff] [blame] | 547 | static int sw_any_bug_found(const struct dmi_system_id *d) |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 548 | { |
| 549 | bios_with_sw_any_bug = 1; |
| 550 | return 0; |
| 551 | } |
| 552 | |
Jeff Garzik | 1855256 | 2007-10-03 15:15:40 -0400 | [diff] [blame] | 553 | static const struct dmi_system_id sw_any_bug_dmi_table[] = { |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 554 | { |
| 555 | .callback = sw_any_bug_found, |
| 556 | .ident = "Supermicro Server X6DLP", |
| 557 | .matches = { |
| 558 | DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"), |
| 559 | DMI_MATCH(DMI_BIOS_VERSION, "080010"), |
| 560 | DMI_MATCH(DMI_PRODUCT_NAME, "X6DLP"), |
| 561 | }, |
| 562 | }, |
| 563 | { } |
| 564 | }; |
Dave Jones | 95625b8 | 2006-10-21 01:37:39 -0400 | [diff] [blame] | 565 | #endif |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 566 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 567 | static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 569 | unsigned int i; |
| 570 | unsigned int valid_states = 0; |
| 571 | unsigned int cpu = policy->cpu; |
| 572 | struct acpi_cpufreq_data *data; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 573 | unsigned int result = 0; |
Mike Travis | 92cb761 | 2007-10-19 20:35:04 +0200 | [diff] [blame] | 574 | struct cpuinfo_x86 *c = &cpu_data(policy->cpu); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 575 | struct acpi_processor_performance *perf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | dprintk("acpi_cpufreq_cpu_init\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 579 | data = kzalloc(sizeof(struct acpi_cpufreq_data), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | if (!data) |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 581 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | |
Fenghua Yu | 5010929 | 2007-08-07 18:40:30 -0400 | [diff] [blame] | 583 | data->acpi_data = percpu_ptr(acpi_perf_data, cpu); |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 584 | per_cpu(drv_data, cpu) = data; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 585 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 586 | if (cpu_has(c, X86_FEATURE_CONSTANT_TSC)) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 587 | acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 589 | result = acpi_processor_register_performance(data->acpi_data, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | if (result) |
| 591 | goto err_free; |
| 592 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 593 | perf = data->acpi_data; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 594 | policy->shared_type = perf->shared_type; |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 595 | |
Venkatesh Pallipadi | 46f18e3 | 2006-06-26 00:34:43 -0400 | [diff] [blame] | 596 | /* |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 597 | * Will let policy->cpus know about dependency only when software |
Venkatesh Pallipadi | 46f18e3 | 2006-06-26 00:34:43 -0400 | [diff] [blame] | 598 | * coordination is required. |
| 599 | */ |
| 600 | if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL || |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 601 | policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) { |
Venkatesh Pallipadi | 46f18e3 | 2006-06-26 00:34:43 -0400 | [diff] [blame] | 602 | policy->cpus = perf->shared_cpu_map; |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 603 | } |
Darrick J. Wong | e8628dd | 2008-04-18 13:31:12 -0700 | [diff] [blame] | 604 | policy->related_cpus = perf->shared_cpu_map; |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 605 | |
| 606 | #ifdef CONFIG_SMP |
| 607 | dmi_check_system(sw_any_bug_dmi_table); |
| 608 | if (bios_with_sw_any_bug && cpus_weight(policy->cpus) == 1) { |
| 609 | policy->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
Mike Travis | 0835761 | 2007-10-16 01:24:04 -0700 | [diff] [blame] | 610 | policy->cpus = per_cpu(cpu_core_map, cpu); |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 611 | } |
| 612 | #endif |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 613 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | /* capability check */ |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 615 | if (perf->state_count <= 1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | dprintk("No P-States\n"); |
| 617 | result = -ENODEV; |
| 618 | goto err_unreg; |
| 619 | } |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 620 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 621 | if (perf->control_register.space_id != perf->status_register.space_id) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | result = -ENODEV; |
| 623 | goto err_unreg; |
| 624 | } |
| 625 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 626 | switch (perf->control_register.space_id) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 627 | case ACPI_ADR_SPACE_SYSTEM_IO: |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 628 | dprintk("SYSTEM IO addr space\n"); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 629 | data->cpu_feature = SYSTEM_IO_CAPABLE; |
| 630 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 631 | case ACPI_ADR_SPACE_FIXED_HARDWARE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 632 | dprintk("HARDWARE addr space\n"); |
| 633 | if (!check_est_cpu(cpu)) { |
| 634 | result = -ENODEV; |
| 635 | goto err_unreg; |
| 636 | } |
| 637 | data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 638 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 639 | default: |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 640 | dprintk("Unknown addr space %d\n", |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 641 | (u32) (perf->control_register.space_id)); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 642 | result = -ENODEV; |
| 643 | goto err_unreg; |
| 644 | } |
| 645 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 646 | data->freq_table = kmalloc(sizeof(struct cpufreq_frequency_table) * |
| 647 | (perf->state_count+1), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | if (!data->freq_table) { |
| 649 | result = -ENOMEM; |
| 650 | goto err_unreg; |
| 651 | } |
| 652 | |
| 653 | /* detect transition latency */ |
| 654 | policy->cpuinfo.transition_latency = 0; |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 655 | for (i=0; i<perf->state_count; i++) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 656 | if ((perf->states[i].transition_latency * 1000) > |
| 657 | policy->cpuinfo.transition_latency) |
| 658 | policy->cpuinfo.transition_latency = |
| 659 | perf->states[i].transition_latency * 1000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 662 | data->max_freq = perf->states[0].core_frequency * 1000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | /* table init */ |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 664 | for (i=0; i<perf->state_count; i++) { |
Zhang Rui | 3cdf552 | 2007-06-13 21:24:02 -0400 | [diff] [blame] | 665 | if (i>0 && perf->states[i].core_frequency >= |
| 666 | data->freq_table[valid_states-1].frequency / 1000) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 667 | continue; |
| 668 | |
| 669 | data->freq_table[valid_states].index = i; |
| 670 | data->freq_table[valid_states].frequency = |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 671 | perf->states[i].core_frequency * 1000; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 672 | valid_states++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | } |
Venkatesh Pallipadi | 3d4a7ef | 2006-11-13 17:47:44 -0800 | [diff] [blame] | 674 | data->freq_table[valid_states].frequency = CPUFREQ_TABLE_END; |
Venkatesh Pallipadi | 8edc59d9 | 2006-12-19 12:58:55 -0800 | [diff] [blame] | 675 | perf->state = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | |
| 677 | result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table); |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 678 | if (result) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | goto err_freqfree; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | |
Mattia Dongili | a507ac4 | 2006-12-15 19:52:45 +0100 | [diff] [blame] | 681 | switch (perf->control_register.space_id) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 682 | case ACPI_ADR_SPACE_SYSTEM_IO: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 683 | /* Current speed is unknown and not detectable by IO port */ |
| 684 | policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu); |
| 685 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 686 | case ACPI_ADR_SPACE_FIXED_HARDWARE: |
Venkatesh Pallipadi | 7650b28 | 2006-10-03 12:36:30 -0700 | [diff] [blame] | 687 | acpi_cpufreq_driver.get = get_cur_freq_on_cpu; |
Mattia Dongili | a507ac4 | 2006-12-15 19:52:45 +0100 | [diff] [blame] | 688 | policy->cur = get_cur_freq_on_cpu(cpu); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 689 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 690 | default: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 691 | break; |
| 692 | } |
| 693 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | /* notify BIOS that we exist */ |
| 695 | acpi_processor_notify_smm(THIS_MODULE); |
| 696 | |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 697 | /* Check for APERF/MPERF support in hardware */ |
| 698 | if (c->x86_vendor == X86_VENDOR_INTEL && c->cpuid_level >= 6) { |
| 699 | unsigned int ecx; |
| 700 | ecx = cpuid_ecx(6); |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 701 | if (ecx & CPUID_6_ECX_APERFMPERF_CAPABILITY) |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 702 | acpi_cpufreq_driver.getavg = get_measured_perf; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 703 | } |
| 704 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 705 | dprintk("CPU%u - ACPI performance management activated.\n", cpu); |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 706 | for (i = 0; i < perf->state_count; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | dprintk(" %cP%d: %d MHz, %d mW, %d uS\n", |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 708 | (i == perf->state ? '*' : ' '), i, |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 709 | (u32) perf->states[i].core_frequency, |
| 710 | (u32) perf->states[i].power, |
| 711 | (u32) perf->states[i].transition_latency); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | |
| 713 | cpufreq_frequency_table_get_attr(data->freq_table, policy->cpu); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 714 | |
Dominik Brodowski | 4b31e77 | 2005-05-18 13:49:00 -0400 | [diff] [blame] | 715 | /* |
| 716 | * the first call to ->target() should result in us actually |
| 717 | * writing something to the appropriate registers. |
| 718 | */ |
| 719 | data->resume = 1; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 720 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 721 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 723 | err_freqfree: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | kfree(data->freq_table); |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 725 | err_unreg: |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 726 | acpi_processor_unregister_performance(perf, cpu); |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 727 | err_free: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | kfree(data); |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 729 | per_cpu(drv_data, cpu) = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 731 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | } |
| 733 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 734 | static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | { |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 736 | struct acpi_cpufreq_data *data = per_cpu(drv_data, policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | dprintk("acpi_cpufreq_cpu_exit\n"); |
| 739 | |
| 740 | if (data) { |
| 741 | cpufreq_frequency_table_put_attr(policy->cpu); |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 742 | per_cpu(drv_data, policy->cpu) = NULL; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 743 | acpi_processor_unregister_performance(data->acpi_data, |
| 744 | policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | kfree(data); |
| 746 | } |
| 747 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 748 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | } |
| 750 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 751 | static int acpi_cpufreq_resume(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | { |
travis@sgi.com | ea348f3 | 2008-01-30 13:33:12 +0100 | [diff] [blame] | 753 | struct acpi_cpufreq_data *data = per_cpu(drv_data, policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | dprintk("acpi_cpufreq_resume\n"); |
| 756 | |
| 757 | data->resume = 1; |
| 758 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 759 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | } |
| 761 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 762 | static struct freq_attr *acpi_cpufreq_attr[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | &cpufreq_freq_attr_scaling_available_freqs, |
| 764 | NULL, |
| 765 | }; |
| 766 | |
| 767 | static struct cpufreq_driver acpi_cpufreq_driver = { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 768 | .verify = acpi_cpufreq_verify, |
| 769 | .target = acpi_cpufreq_target, |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 770 | .init = acpi_cpufreq_cpu_init, |
| 771 | .exit = acpi_cpufreq_cpu_exit, |
| 772 | .resume = acpi_cpufreq_resume, |
| 773 | .name = "acpi-cpufreq", |
| 774 | .owner = THIS_MODULE, |
| 775 | .attr = acpi_cpufreq_attr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | }; |
| 777 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 778 | static int __init acpi_cpufreq_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | { |
Fenghua Yu | 5010929 | 2007-08-07 18:40:30 -0400 | [diff] [blame] | 780 | int ret; |
| 781 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | dprintk("acpi_cpufreq_init\n"); |
| 783 | |
Fenghua Yu | 5010929 | 2007-08-07 18:40:30 -0400 | [diff] [blame] | 784 | ret = acpi_cpufreq_early_init(); |
| 785 | if (ret) |
| 786 | return ret; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 787 | |
Akinobu Mita | 847aef6 | 2008-07-14 11:59:44 +0900 | [diff] [blame^] | 788 | ret = cpufreq_register_driver(&acpi_cpufreq_driver); |
| 789 | if (ret) |
| 790 | free_percpu(acpi_perf_data); |
| 791 | |
| 792 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | } |
| 794 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 795 | static void __exit acpi_cpufreq_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | { |
| 797 | dprintk("acpi_cpufreq_exit\n"); |
| 798 | |
| 799 | cpufreq_unregister_driver(&acpi_cpufreq_driver); |
| 800 | |
Fenghua Yu | 5010929 | 2007-08-07 18:40:30 -0400 | [diff] [blame] | 801 | free_percpu(acpi_perf_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | } |
| 803 | |
Venkatesh Pallipadi | d395bf1 | 2005-08-25 15:59:00 -0400 | [diff] [blame] | 804 | module_param(acpi_pstate_strict, uint, 0644); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 805 | MODULE_PARM_DESC(acpi_pstate_strict, |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 806 | "value 0 or non-zero. non-zero -> strict ACPI checks are " |
| 807 | "performed during frequency changes."); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | |
| 809 | late_initcall(acpi_cpufreq_init); |
| 810 | module_exit(acpi_cpufreq_exit); |
| 811 | |
| 812 | MODULE_ALIAS("acpi"); |