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 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 70 | static struct acpi_cpufreq_data *drv_data[NR_CPUS]; |
| 71 | static struct acpi_processor_performance *acpi_perf_data[NR_CPUS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
| 73 | static struct cpufreq_driver acpi_cpufreq_driver; |
| 74 | |
Venkatesh Pallipadi | d395bf1 | 2005-08-25 15:59:00 -0400 | [diff] [blame] | 75 | static unsigned int acpi_pstate_strict; |
| 76 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 77 | static int check_est_cpu(unsigned int cpuid) |
| 78 | { |
| 79 | struct cpuinfo_x86 *cpu = &cpu_data[cpuid]; |
| 80 | |
| 81 | if (cpu->x86_vendor != X86_VENDOR_INTEL || |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 82 | !cpu_has(cpu, X86_FEATURE_EST)) |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 83 | return 0; |
| 84 | |
| 85 | return 1; |
| 86 | } |
| 87 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 88 | static unsigned extract_io(u32 value, struct acpi_cpufreq_data *data) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 89 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 90 | struct acpi_processor_performance *perf; |
| 91 | int i; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 92 | |
| 93 | perf = data->acpi_data; |
| 94 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 95 | for (i=0; i<perf->state_count; i++) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 96 | if (value == perf->states[i].status) |
| 97 | return data->freq_table[i].frequency; |
| 98 | } |
| 99 | return 0; |
| 100 | } |
| 101 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 102 | static unsigned extract_msr(u32 msr, struct acpi_cpufreq_data *data) |
| 103 | { |
| 104 | int i; |
Venkatesh Pallipadi | a6f6e6e6 | 2006-10-03 12:37:42 -0700 | [diff] [blame] | 105 | struct acpi_processor_performance *perf; |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 106 | |
| 107 | msr &= INTEL_MSR_RANGE; |
Venkatesh Pallipadi | a6f6e6e6 | 2006-10-03 12:37:42 -0700 | [diff] [blame] | 108 | perf = data->acpi_data; |
| 109 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 110 | for (i=0; data->freq_table[i].frequency != CPUFREQ_TABLE_END; i++) { |
Venkatesh Pallipadi | a6f6e6e6 | 2006-10-03 12:37:42 -0700 | [diff] [blame] | 111 | if (msr == perf->states[data->freq_table[i].index].status) |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 112 | return data->freq_table[i].frequency; |
| 113 | } |
| 114 | return data->freq_table[0].frequency; |
| 115 | } |
| 116 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 117 | static unsigned extract_freq(u32 val, struct acpi_cpufreq_data *data) |
| 118 | { |
| 119 | switch (data->cpu_feature) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 120 | case SYSTEM_INTEL_MSR_CAPABLE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 121 | return extract_msr(val, data); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 122 | case SYSTEM_IO_CAPABLE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 123 | return extract_io(val, data); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 124 | default: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 125 | return 0; |
| 126 | } |
| 127 | } |
| 128 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 129 | struct msr_addr { |
| 130 | u32 reg; |
| 131 | }; |
| 132 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 133 | struct io_addr { |
| 134 | u16 port; |
| 135 | u8 bit_width; |
| 136 | }; |
| 137 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 138 | typedef union { |
| 139 | struct msr_addr msr; |
| 140 | struct io_addr io; |
| 141 | } drv_addr_union; |
| 142 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 143 | struct drv_cmd { |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 144 | unsigned int type; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 145 | cpumask_t mask; |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 146 | drv_addr_union addr; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 147 | u32 val; |
| 148 | }; |
| 149 | |
| 150 | static void do_drv_read(struct drv_cmd *cmd) |
| 151 | { |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 152 | u32 h; |
| 153 | |
| 154 | switch (cmd->type) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 155 | case SYSTEM_INTEL_MSR_CAPABLE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 156 | rdmsr(cmd->addr.msr.reg, cmd->val, h); |
| 157 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 158 | case SYSTEM_IO_CAPABLE: |
Venkatesh Pallipadi | 4e581ff | 2006-12-13 10:41:16 -0800 | [diff] [blame^] | 159 | acpi_os_read_port((acpi_io_address)cmd->addr.io.port, |
| 160 | &cmd->val, |
| 161 | (u32)cmd->addr.io.bit_width); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 162 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 163 | default: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 164 | break; |
| 165 | } |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 166 | } |
| 167 | |
| 168 | static void do_drv_write(struct drv_cmd *cmd) |
| 169 | { |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 170 | u32 h = 0; |
| 171 | |
| 172 | switch (cmd->type) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 173 | case SYSTEM_INTEL_MSR_CAPABLE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 174 | wrmsr(cmd->addr.msr.reg, cmd->val, h); |
| 175 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 176 | case SYSTEM_IO_CAPABLE: |
Venkatesh Pallipadi | 4e581ff | 2006-12-13 10:41:16 -0800 | [diff] [blame^] | 177 | acpi_os_write_port((acpi_io_address)cmd->addr.io.port, |
| 178 | cmd->val, |
| 179 | (u32)cmd->addr.io.bit_width); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 180 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 181 | default: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 182 | break; |
| 183 | } |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 184 | } |
| 185 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 186 | static void drv_read(struct drv_cmd *cmd) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 187 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 188 | cpumask_t saved_mask = current->cpus_allowed; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 189 | cmd->val = 0; |
| 190 | |
| 191 | set_cpus_allowed(current, cmd->mask); |
| 192 | do_drv_read(cmd); |
| 193 | set_cpus_allowed(current, saved_mask); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 194 | } |
| 195 | |
| 196 | static void drv_write(struct drv_cmd *cmd) |
| 197 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 198 | cpumask_t saved_mask = current->cpus_allowed; |
| 199 | unsigned int i; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 200 | |
| 201 | for_each_cpu_mask(i, cmd->mask) { |
| 202 | set_cpus_allowed(current, cpumask_of_cpu(i)); |
| 203 | do_drv_write(cmd); |
| 204 | } |
| 205 | |
| 206 | set_cpus_allowed(current, saved_mask); |
| 207 | return; |
| 208 | } |
| 209 | |
| 210 | static u32 get_cur_val(cpumask_t mask) |
| 211 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 212 | struct acpi_processor_performance *perf; |
| 213 | struct drv_cmd cmd; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 214 | |
| 215 | if (unlikely(cpus_empty(mask))) |
| 216 | return 0; |
| 217 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 218 | switch (drv_data[first_cpu(mask)]->cpu_feature) { |
| 219 | case SYSTEM_INTEL_MSR_CAPABLE: |
| 220 | cmd.type = SYSTEM_INTEL_MSR_CAPABLE; |
| 221 | cmd.addr.msr.reg = MSR_IA32_PERF_STATUS; |
| 222 | break; |
| 223 | case SYSTEM_IO_CAPABLE: |
| 224 | cmd.type = SYSTEM_IO_CAPABLE; |
| 225 | perf = drv_data[first_cpu(mask)]->acpi_data; |
| 226 | cmd.addr.io.port = perf->control_register.address; |
| 227 | cmd.addr.io.bit_width = perf->control_register.bit_width; |
| 228 | break; |
| 229 | default: |
| 230 | return 0; |
| 231 | } |
| 232 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 233 | cmd.mask = mask; |
| 234 | |
| 235 | drv_read(&cmd); |
| 236 | |
| 237 | dprintk("get_cur_val = %u\n", cmd.val); |
| 238 | |
| 239 | return cmd.val; |
| 240 | } |
| 241 | |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 242 | /* |
| 243 | * Return the measured active (C0) frequency on this CPU since last call |
| 244 | * to this function. |
| 245 | * Input: cpu number |
| 246 | * Return: Average CPU frequency in terms of max frequency (zero on error) |
| 247 | * |
| 248 | * We use IA32_MPERF and IA32_APERF MSRs to get the measured performance |
| 249 | * over a period of time, while CPU is in C0 state. |
| 250 | * IA32_MPERF counts at the rate of max advertised frequency |
| 251 | * IA32_APERF counts at the rate of actual CPU frequency |
| 252 | * Only IA32_APERF/IA32_MPERF ratio is architecturally defined and |
| 253 | * no meaning should be associated with absolute values of these MSRs. |
| 254 | */ |
| 255 | static unsigned int get_measured_perf(unsigned int cpu) |
| 256 | { |
| 257 | union { |
| 258 | struct { |
| 259 | u32 lo; |
| 260 | u32 hi; |
| 261 | } split; |
| 262 | u64 whole; |
| 263 | } aperf_cur, mperf_cur; |
| 264 | |
| 265 | cpumask_t saved_mask; |
| 266 | unsigned int perf_percent; |
| 267 | unsigned int retval; |
| 268 | |
| 269 | saved_mask = current->cpus_allowed; |
| 270 | set_cpus_allowed(current, cpumask_of_cpu(cpu)); |
| 271 | if (get_cpu() != cpu) { |
| 272 | /* We were not able to run on requested processor */ |
| 273 | put_cpu(); |
| 274 | return 0; |
| 275 | } |
| 276 | |
| 277 | rdmsr(MSR_IA32_APERF, aperf_cur.split.lo, aperf_cur.split.hi); |
| 278 | rdmsr(MSR_IA32_MPERF, mperf_cur.split.lo, mperf_cur.split.hi); |
| 279 | |
| 280 | wrmsr(MSR_IA32_APERF, 0,0); |
| 281 | wrmsr(MSR_IA32_MPERF, 0,0); |
| 282 | |
| 283 | #ifdef __i386__ |
| 284 | /* |
| 285 | * We dont want to do 64 bit divide with 32 bit kernel |
| 286 | * Get an approximate value. Return failure in case we cannot get |
| 287 | * an approximate value. |
| 288 | */ |
| 289 | if (unlikely(aperf_cur.split.hi || mperf_cur.split.hi)) { |
| 290 | int shift_count; |
| 291 | u32 h; |
| 292 | |
| 293 | h = max_t(u32, aperf_cur.split.hi, mperf_cur.split.hi); |
| 294 | shift_count = fls(h); |
| 295 | |
| 296 | aperf_cur.whole >>= shift_count; |
| 297 | mperf_cur.whole >>= shift_count; |
| 298 | } |
| 299 | |
| 300 | if (((unsigned long)(-1) / 100) < aperf_cur.split.lo) { |
| 301 | int shift_count = 7; |
| 302 | aperf_cur.split.lo >>= shift_count; |
| 303 | mperf_cur.split.lo >>= shift_count; |
| 304 | } |
| 305 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 306 | if (aperf_cur.split.lo && mperf_cur.split.lo) |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 307 | perf_percent = (aperf_cur.split.lo * 100) / mperf_cur.split.lo; |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 308 | else |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 309 | perf_percent = 0; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 310 | |
| 311 | #else |
| 312 | if (unlikely(((unsigned long)(-1) / 100) < aperf_cur.whole)) { |
| 313 | int shift_count = 7; |
| 314 | aperf_cur.whole >>= shift_count; |
| 315 | mperf_cur.whole >>= shift_count; |
| 316 | } |
| 317 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 318 | if (aperf_cur.whole && mperf_cur.whole) |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 319 | perf_percent = (aperf_cur.whole * 100) / mperf_cur.whole; |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 320 | else |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 321 | perf_percent = 0; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 322 | |
| 323 | #endif |
| 324 | |
| 325 | retval = drv_data[cpu]->max_freq * perf_percent / 100; |
| 326 | |
| 327 | put_cpu(); |
| 328 | set_cpus_allowed(current, saved_mask); |
| 329 | |
| 330 | dprintk("cpu %d: performance percent %d\n", cpu, perf_percent); |
| 331 | return retval; |
| 332 | } |
| 333 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 334 | static unsigned int get_cur_freq_on_cpu(unsigned int cpu) |
| 335 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 336 | struct acpi_cpufreq_data *data = drv_data[cpu]; |
| 337 | unsigned int freq; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 338 | |
| 339 | dprintk("get_cur_freq_on_cpu (%d)\n", cpu); |
| 340 | |
| 341 | if (unlikely(data == NULL || |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 342 | data->acpi_data == NULL || data->freq_table == NULL)) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 343 | return 0; |
| 344 | } |
| 345 | |
| 346 | freq = extract_freq(get_cur_val(cpumask_of_cpu(cpu)), data); |
| 347 | dprintk("cur freq = %u\n", freq); |
| 348 | |
| 349 | return freq; |
| 350 | } |
| 351 | |
| 352 | static unsigned int check_freqs(cpumask_t mask, unsigned int freq, |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 353 | struct acpi_cpufreq_data *data) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 354 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 355 | unsigned int cur_freq; |
| 356 | unsigned int i; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 357 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 358 | for (i=0; i<100; i++) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 359 | cur_freq = extract_freq(get_cur_val(mask), data); |
| 360 | if (cur_freq == freq) |
| 361 | return 1; |
| 362 | udelay(10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | } |
| 364 | return 0; |
| 365 | } |
| 366 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 367 | static int acpi_cpufreq_target(struct cpufreq_policy *policy, |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 368 | unsigned int target_freq, unsigned int relation) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 370 | struct acpi_cpufreq_data *data = drv_data[policy->cpu]; |
| 371 | struct acpi_processor_performance *perf; |
| 372 | struct cpufreq_freqs freqs; |
| 373 | cpumask_t online_policy_cpus; |
| 374 | struct drv_cmd cmd; |
| 375 | unsigned int msr; |
| 376 | unsigned int next_state = 0; |
| 377 | unsigned int next_perf_state = 0; |
| 378 | unsigned int i; |
| 379 | int result = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 381 | dprintk("acpi_cpufreq_target %d (%d)\n", target_freq, policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 383 | if (unlikely(data == NULL || |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 384 | data->acpi_data == NULL || data->freq_table == NULL)) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 385 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | } |
| 387 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 388 | perf = data->acpi_data; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 389 | result = cpufreq_frequency_table_target(policy, |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 390 | data->freq_table, |
| 391 | target_freq, |
| 392 | relation, &next_state); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 393 | if (unlikely(result)) |
| 394 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | |
Andrew Morton | 7e1f19e | 2006-03-28 17:03:00 -0500 | [diff] [blame] | 396 | #ifdef CONFIG_HOTPLUG_CPU |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 397 | /* cpufreq holds the hotplug lock, so we are safe from here on */ |
| 398 | cpus_and(online_policy_cpus, cpu_online_map, policy->cpus); |
Andrew Morton | 7e1f19e | 2006-03-28 17:03:00 -0500 | [diff] [blame] | 399 | #else |
| 400 | online_policy_cpus = policy->cpus; |
| 401 | #endif |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 402 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 403 | next_perf_state = data->freq_table[next_state].index; |
Venkatesh Pallipadi | 7650b28 | 2006-10-03 12:36:30 -0700 | [diff] [blame] | 404 | if (perf->state == next_perf_state) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 405 | if (unlikely(data->resume)) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 406 | dprintk("Called after resume, resetting to P%d\n", |
| 407 | next_perf_state); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 408 | data->resume = 0; |
| 409 | } else { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 410 | dprintk("Already at target state (P%d)\n", |
| 411 | next_perf_state); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 412 | return 0; |
| 413 | } |
| 414 | } |
| 415 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 416 | switch (data->cpu_feature) { |
| 417 | case SYSTEM_INTEL_MSR_CAPABLE: |
| 418 | cmd.type = SYSTEM_INTEL_MSR_CAPABLE; |
| 419 | cmd.addr.msr.reg = MSR_IA32_PERF_CTL; |
| 420 | msr = |
| 421 | (u32) perf->states[next_perf_state]. |
| 422 | control & INTEL_MSR_RANGE; |
| 423 | cmd.val = (cmd.val & ~INTEL_MSR_RANGE) | msr; |
| 424 | break; |
| 425 | case SYSTEM_IO_CAPABLE: |
| 426 | cmd.type = SYSTEM_IO_CAPABLE; |
| 427 | cmd.addr.io.port = perf->control_register.address; |
| 428 | cmd.addr.io.bit_width = perf->control_register.bit_width; |
| 429 | cmd.val = (u32) perf->states[next_perf_state].control; |
| 430 | break; |
| 431 | default: |
| 432 | return -ENODEV; |
| 433 | } |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 434 | |
| 435 | cpus_clear(cmd.mask); |
| 436 | |
| 437 | if (policy->shared_type != CPUFREQ_SHARED_TYPE_ANY) |
| 438 | cmd.mask = online_policy_cpus; |
| 439 | else |
| 440 | cpu_set(policy->cpu, cmd.mask); |
| 441 | |
Venkatesh Pallipadi | 7650b28 | 2006-10-03 12:36:30 -0700 | [diff] [blame] | 442 | freqs.old = data->freq_table[perf->state].frequency; |
| 443 | freqs.new = data->freq_table[next_perf_state].frequency; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 444 | for_each_cpu_mask(i, cmd.mask) { |
| 445 | freqs.cpu = i; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 446 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); |
| 447 | } |
| 448 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 449 | drv_write(&cmd); |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 450 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 451 | if (acpi_pstate_strict) { |
| 452 | if (!check_freqs(cmd.mask, freqs.new, data)) { |
| 453 | dprintk("acpi_cpufreq_target failed (%d)\n", |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 454 | policy->cpu); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 455 | return -EAGAIN; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 456 | } |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 457 | } |
| 458 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 459 | for_each_cpu_mask(i, cmd.mask) { |
| 460 | freqs.cpu = i; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 461 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); |
| 462 | } |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 463 | perf->state = next_perf_state; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 464 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 465 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | } |
| 467 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 468 | static int acpi_cpufreq_verify(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 470 | struct acpi_cpufreq_data *data = drv_data[policy->cpu]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | |
| 472 | dprintk("acpi_cpufreq_verify\n"); |
| 473 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 474 | return cpufreq_frequency_table_verify(policy, data->freq_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | } |
| 476 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | static unsigned long |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 478 | acpi_cpufreq_guess_freq(struct acpi_cpufreq_data *data, unsigned int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 480 | struct acpi_processor_performance *perf = data->acpi_data; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 481 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | if (cpu_khz) { |
| 483 | /* search the closest match to cpu_khz */ |
| 484 | unsigned int i; |
| 485 | unsigned long freq; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 486 | unsigned long freqn = perf->states[0].core_frequency * 1000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 488 | for (i=0; i<(perf->state_count-1); i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | freq = freqn; |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 490 | freqn = perf->states[i+1].core_frequency * 1000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | if ((2 * cpu_khz) > (freqn + freq)) { |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 492 | perf->state = i; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 493 | return freq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | } |
| 495 | } |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 496 | perf->state = perf->state_count-1; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 497 | return freqn; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 498 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | /* assume CPU is at P0... */ |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 500 | perf->state = 0; |
| 501 | return perf->states[0].core_frequency * 1000; |
| 502 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | } |
| 504 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 505 | /* |
| 506 | * acpi_cpufreq_early_init - initialize ACPI P-States library |
| 507 | * |
| 508 | * Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c) |
| 509 | * in order to determine correct frequency and voltage pairings. We can |
| 510 | * do _PDC and _PSD and find out the processor dependency for the |
| 511 | * actual init that will happen later... |
| 512 | */ |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 513 | static int acpi_cpufreq_early_init(void) |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 514 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 515 | struct acpi_processor_performance *data; |
| 516 | cpumask_t covered; |
| 517 | unsigned int i, j; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 518 | |
| 519 | dprintk("acpi_cpufreq_early_init\n"); |
| 520 | |
Andrew Morton | fb1bb34 | 2006-06-25 05:46:43 -0700 | [diff] [blame] | 521 | for_each_possible_cpu(i) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 522 | data = kzalloc(sizeof(struct acpi_processor_performance), |
| 523 | GFP_KERNEL); |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 524 | if (!data) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 525 | for_each_cpu_mask(j, covered) { |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 526 | kfree(acpi_perf_data[j]); |
| 527 | acpi_perf_data[j] = NULL; |
| 528 | } |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 529 | return -ENOMEM; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 530 | } |
| 531 | acpi_perf_data[i] = data; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 532 | cpu_set(i, covered); |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 533 | } |
| 534 | |
| 535 | /* Do initialization in ACPI core */ |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 536 | acpi_processor_preregister_performance(acpi_perf_data); |
| 537 | return 0; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 538 | } |
| 539 | |
Dave Jones | 95625b8 | 2006-10-21 01:37:39 -0400 | [diff] [blame] | 540 | #ifdef CONFIG_SMP |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 541 | /* |
| 542 | * Some BIOSes do SW_ANY coordination internally, either set it up in hw |
| 543 | * or do it in BIOS firmware and won't inform about it to OS. If not |
| 544 | * detected, this has a side effect of making CPU run at a different speed |
| 545 | * than OS intended it to run at. Detect it and handle it cleanly. |
| 546 | */ |
| 547 | static int bios_with_sw_any_bug; |
| 548 | |
Venkatesh Pallipadi | 0497c8c | 2006-09-25 11:23:32 -0700 | [diff] [blame] | 549 | static int sw_any_bug_found(struct dmi_system_id *d) |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 550 | { |
| 551 | bios_with_sw_any_bug = 1; |
| 552 | return 0; |
| 553 | } |
| 554 | |
Venkatesh Pallipadi | 0497c8c | 2006-09-25 11:23:32 -0700 | [diff] [blame] | 555 | static struct dmi_system_id sw_any_bug_dmi_table[] = { |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 556 | { |
| 557 | .callback = sw_any_bug_found, |
| 558 | .ident = "Supermicro Server X6DLP", |
| 559 | .matches = { |
| 560 | DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"), |
| 561 | DMI_MATCH(DMI_BIOS_VERSION, "080010"), |
| 562 | DMI_MATCH(DMI_PRODUCT_NAME, "X6DLP"), |
| 563 | }, |
| 564 | }, |
| 565 | { } |
| 566 | }; |
Dave Jones | 95625b8 | 2006-10-21 01:37:39 -0400 | [diff] [blame] | 567 | #endif |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 568 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 569 | static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 571 | unsigned int i; |
| 572 | unsigned int valid_states = 0; |
| 573 | unsigned int cpu = policy->cpu; |
| 574 | struct acpi_cpufreq_data *data; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 575 | unsigned int result = 0; |
| 576 | struct cpuinfo_x86 *c = &cpu_data[policy->cpu]; |
| 577 | struct acpi_processor_performance *perf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | dprintk("acpi_cpufreq_cpu_init\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 581 | if (!acpi_perf_data[cpu]) |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 582 | return -ENODEV; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 583 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 584 | data = kzalloc(sizeof(struct acpi_cpufreq_data), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | if (!data) |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 586 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 588 | data->acpi_data = acpi_perf_data[cpu]; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 589 | drv_data[cpu] = data; |
| 590 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 591 | if (cpu_has(c, X86_FEATURE_CONSTANT_TSC)) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 592 | acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 594 | result = acpi_processor_register_performance(data->acpi_data, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | if (result) |
| 596 | goto err_free; |
| 597 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 598 | perf = data->acpi_data; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 599 | policy->shared_type = perf->shared_type; |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 600 | |
Venkatesh Pallipadi | 46f18e3 | 2006-06-26 00:34:43 -0400 | [diff] [blame] | 601 | /* |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 602 | * Will let policy->cpus know about dependency only when software |
Venkatesh Pallipadi | 46f18e3 | 2006-06-26 00:34:43 -0400 | [diff] [blame] | 603 | * coordination is required. |
| 604 | */ |
| 605 | if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL || |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 606 | policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) { |
Venkatesh Pallipadi | 46f18e3 | 2006-06-26 00:34:43 -0400 | [diff] [blame] | 607 | policy->cpus = perf->shared_cpu_map; |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 608 | } |
| 609 | |
| 610 | #ifdef CONFIG_SMP |
| 611 | dmi_check_system(sw_any_bug_dmi_table); |
| 612 | if (bios_with_sw_any_bug && cpus_weight(policy->cpus) == 1) { |
| 613 | policy->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
| 614 | policy->cpus = cpu_core_map[cpu]; |
| 615 | } |
| 616 | #endif |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 617 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | /* capability check */ |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 619 | if (perf->state_count <= 1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | dprintk("No P-States\n"); |
| 621 | result = -ENODEV; |
| 622 | goto err_unreg; |
| 623 | } |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 624 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 625 | if (perf->control_register.space_id != perf->status_register.space_id) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | result = -ENODEV; |
| 627 | goto err_unreg; |
| 628 | } |
| 629 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 630 | switch (perf->control_register.space_id) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 631 | case ACPI_ADR_SPACE_SYSTEM_IO: |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 632 | dprintk("SYSTEM IO addr space\n"); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 633 | data->cpu_feature = SYSTEM_IO_CAPABLE; |
| 634 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 635 | case ACPI_ADR_SPACE_FIXED_HARDWARE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 636 | dprintk("HARDWARE addr space\n"); |
| 637 | if (!check_est_cpu(cpu)) { |
| 638 | result = -ENODEV; |
| 639 | goto err_unreg; |
| 640 | } |
| 641 | data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 642 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 643 | default: |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 644 | dprintk("Unknown addr space %d\n", |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 645 | (u32) (perf->control_register.space_id)); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 646 | result = -ENODEV; |
| 647 | goto err_unreg; |
| 648 | } |
| 649 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 650 | data->freq_table = kmalloc(sizeof(struct cpufreq_frequency_table) * |
| 651 | (perf->state_count+1), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | if (!data->freq_table) { |
| 653 | result = -ENOMEM; |
| 654 | goto err_unreg; |
| 655 | } |
| 656 | |
| 657 | /* detect transition latency */ |
| 658 | policy->cpuinfo.transition_latency = 0; |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 659 | for (i=0; i<perf->state_count; i++) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 660 | if ((perf->states[i].transition_latency * 1000) > |
| 661 | policy->cpuinfo.transition_latency) |
| 662 | policy->cpuinfo.transition_latency = |
| 663 | perf->states[i].transition_latency * 1000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | } |
| 665 | policy->governor = CPUFREQ_DEFAULT_GOVERNOR; |
| 666 | |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 667 | data->max_freq = perf->states[0].core_frequency * 1000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | /* table init */ |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 669 | for (i=0; i<perf->state_count; i++) { |
| 670 | if (i>0 && perf->states[i].core_frequency == |
| 671 | perf->states[i-1].core_frequency) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 672 | continue; |
| 673 | |
| 674 | data->freq_table[valid_states].index = i; |
| 675 | data->freq_table[valid_states].frequency = |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 676 | perf->states[i].core_frequency * 1000; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 677 | valid_states++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | } |
Venkatesh Pallipadi | 3d4a7ef | 2006-11-13 17:47:44 -0800 | [diff] [blame] | 679 | data->freq_table[valid_states].frequency = CPUFREQ_TABLE_END; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | |
| 681 | result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table); |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 682 | if (result) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | goto err_freqfree; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 685 | switch (data->cpu_feature) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 686 | case ACPI_ADR_SPACE_SYSTEM_IO: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 687 | /* Current speed is unknown and not detectable by IO port */ |
| 688 | policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu); |
| 689 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 690 | case ACPI_ADR_SPACE_FIXED_HARDWARE: |
Venkatesh Pallipadi | 7650b28 | 2006-10-03 12:36:30 -0700 | [diff] [blame] | 691 | acpi_cpufreq_driver.get = get_cur_freq_on_cpu; |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 692 | get_cur_freq_on_cpu(cpu); |
| 693 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 694 | default: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 695 | break; |
| 696 | } |
| 697 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | /* notify BIOS that we exist */ |
| 699 | acpi_processor_notify_smm(THIS_MODULE); |
| 700 | |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 701 | /* Check for APERF/MPERF support in hardware */ |
| 702 | if (c->x86_vendor == X86_VENDOR_INTEL && c->cpuid_level >= 6) { |
| 703 | unsigned int ecx; |
| 704 | ecx = cpuid_ecx(6); |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 705 | if (ecx & CPUID_6_ECX_APERFMPERF_CAPABILITY) |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 706 | acpi_cpufreq_driver.getavg = get_measured_perf; |
Venkatesh Pallipadi | dfde5d6 | 2006-10-03 12:38:45 -0700 | [diff] [blame] | 707 | } |
| 708 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 709 | dprintk("CPU%u - ACPI performance management activated.\n", cpu); |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 710 | for (i = 0; i < perf->state_count; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | dprintk(" %cP%d: %d MHz, %d mW, %d uS\n", |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 712 | (i == perf->state ? '*' : ' '), i, |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 713 | (u32) perf->states[i].core_frequency, |
| 714 | (u32) perf->states[i].power, |
| 715 | (u32) perf->states[i].transition_latency); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | |
| 717 | cpufreq_frequency_table_get_attr(data->freq_table, policy->cpu); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 718 | |
Dominik Brodowski | 4b31e77 | 2005-05-18 13:49:00 -0400 | [diff] [blame] | 719 | /* |
| 720 | * the first call to ->target() should result in us actually |
| 721 | * writing something to the appropriate registers. |
| 722 | */ |
| 723 | data->resume = 1; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 724 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 725 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 727 | err_freqfree: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | kfree(data->freq_table); |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 729 | err_unreg: |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 730 | acpi_processor_unregister_performance(perf, cpu); |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 731 | err_free: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | kfree(data); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 733 | drv_data[cpu] = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 735 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | } |
| 737 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 738 | static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 740 | struct acpi_cpufreq_data *data = drv_data[policy->cpu]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | dprintk("acpi_cpufreq_cpu_exit\n"); |
| 743 | |
| 744 | if (data) { |
| 745 | cpufreq_frequency_table_put_attr(policy->cpu); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 746 | drv_data[policy->cpu] = NULL; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 747 | acpi_processor_unregister_performance(data->acpi_data, |
| 748 | policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | kfree(data); |
| 750 | } |
| 751 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 752 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | } |
| 754 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 755 | static int acpi_cpufreq_resume(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 757 | struct acpi_cpufreq_data *data = drv_data[policy->cpu]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | dprintk("acpi_cpufreq_resume\n"); |
| 760 | |
| 761 | data->resume = 1; |
| 762 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 763 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | } |
| 765 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 766 | static struct freq_attr *acpi_cpufreq_attr[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | &cpufreq_freq_attr_scaling_available_freqs, |
| 768 | NULL, |
| 769 | }; |
| 770 | |
| 771 | static struct cpufreq_driver acpi_cpufreq_driver = { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 772 | .verify = acpi_cpufreq_verify, |
| 773 | .target = acpi_cpufreq_target, |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 774 | .init = acpi_cpufreq_cpu_init, |
| 775 | .exit = acpi_cpufreq_cpu_exit, |
| 776 | .resume = acpi_cpufreq_resume, |
| 777 | .name = "acpi-cpufreq", |
| 778 | .owner = THIS_MODULE, |
| 779 | .attr = acpi_cpufreq_attr, |
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 __init acpi_cpufreq_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | dprintk("acpi_cpufreq_init\n"); |
| 785 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 786 | acpi_cpufreq_early_init(); |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 787 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 788 | return cpufreq_register_driver(&acpi_cpufreq_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | } |
| 790 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 791 | static void __exit acpi_cpufreq_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 793 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | dprintk("acpi_cpufreq_exit\n"); |
| 795 | |
| 796 | cpufreq_unregister_driver(&acpi_cpufreq_driver); |
| 797 | |
Andrew Morton | fb1bb34 | 2006-06-25 05:46:43 -0700 | [diff] [blame] | 798 | for_each_possible_cpu(i) { |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 799 | kfree(acpi_perf_data[i]); |
| 800 | acpi_perf_data[i] = NULL; |
| 801 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | return; |
| 803 | } |
| 804 | |
Venkatesh Pallipadi | d395bf1 | 2005-08-25 15:59:00 -0400 | [diff] [blame] | 805 | module_param(acpi_pstate_strict, uint, 0644); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame] | 806 | MODULE_PARM_DESC(acpi_pstate_strict, |
Dave Jones | 95dd722 | 2006-10-18 00:41:48 -0400 | [diff] [blame] | 807 | "value 0 or non-zero. non-zero -> strict ACPI checks are " |
| 808 | "performed during frequency changes."); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | |
| 810 | late_initcall(acpi_cpufreq_init); |
| 811 | module_exit(acpi_cpufreq_exit); |
| 812 | |
| 813 | MODULE_ALIAS("acpi"); |