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> |
Tim Schmielau | 4e57b68 | 2005-10-30 15:03:48 -0800 | [diff] [blame] | 35 | #include <linux/sched.h> /* current */ |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 36 | #include <linux/dmi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
| 38 | #include <linux/acpi.h> |
| 39 | #include <acpi/processor.h> |
| 40 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 41 | #include <asm/io.h> |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 42 | #include <asm/msr.h> |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 43 | #include <asm/processor.h> |
| 44 | #include <asm/cpufeature.h> |
| 45 | #include <asm/delay.h> |
| 46 | #include <asm/uaccess.h> |
| 47 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "acpi-cpufreq", msg) |
| 49 | |
| 50 | MODULE_AUTHOR("Paul Diefenbaugh, Dominik Brodowski"); |
| 51 | MODULE_DESCRIPTION("ACPI Processor P-States Driver"); |
| 52 | MODULE_LICENSE("GPL"); |
| 53 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 54 | enum { |
| 55 | UNDEFINED_CAPABLE = 0, |
| 56 | SYSTEM_INTEL_MSR_CAPABLE, |
| 57 | SYSTEM_IO_CAPABLE, |
| 58 | }; |
| 59 | |
| 60 | #define INTEL_MSR_RANGE (0xffff) |
| 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; |
| 65 | unsigned int resume; |
| 66 | unsigned int cpu_feature; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | }; |
| 68 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 69 | static struct acpi_cpufreq_data *drv_data[NR_CPUS]; |
| 70 | static struct acpi_processor_performance *acpi_perf_data[NR_CPUS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
| 72 | static struct cpufreq_driver acpi_cpufreq_driver; |
| 73 | |
Venkatesh Pallipadi | d395bf1 | 2005-08-25 15:59:00 -0400 | [diff] [blame] | 74 | static unsigned int acpi_pstate_strict; |
| 75 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 76 | static int check_est_cpu(unsigned int cpuid) |
| 77 | { |
| 78 | struct cpuinfo_x86 *cpu = &cpu_data[cpuid]; |
| 79 | |
| 80 | if (cpu->x86_vendor != X86_VENDOR_INTEL || |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 81 | !cpu_has(cpu, X86_FEATURE_EST)) |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 82 | return 0; |
| 83 | |
| 84 | return 1; |
| 85 | } |
| 86 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 87 | static unsigned extract_io(u32 value, struct acpi_cpufreq_data *data) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 88 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 89 | struct acpi_processor_performance *perf; |
| 90 | int i; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 91 | |
| 92 | perf = data->acpi_data; |
| 93 | |
| 94 | for (i = 0; i < perf->state_count; i++) { |
| 95 | if (value == perf->states[i].status) |
| 96 | return data->freq_table[i].frequency; |
| 97 | } |
| 98 | return 0; |
| 99 | } |
| 100 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 101 | static unsigned extract_msr(u32 msr, struct acpi_cpufreq_data *data) |
| 102 | { |
| 103 | int i; |
| 104 | |
| 105 | msr &= INTEL_MSR_RANGE; |
| 106 | for (i = 0; data->freq_table[i].frequency != CPUFREQ_TABLE_END; i++) { |
| 107 | if (msr == data->freq_table[i].index) |
| 108 | return data->freq_table[i].frequency; |
| 109 | } |
| 110 | return data->freq_table[0].frequency; |
| 111 | } |
| 112 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 113 | static unsigned extract_freq(u32 val, struct acpi_cpufreq_data *data) |
| 114 | { |
| 115 | switch (data->cpu_feature) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 116 | case SYSTEM_INTEL_MSR_CAPABLE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 117 | return extract_msr(val, data); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 118 | case SYSTEM_IO_CAPABLE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 119 | return extract_io(val, data); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 120 | default: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 121 | return 0; |
| 122 | } |
| 123 | } |
| 124 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 125 | static void wrport(u16 port, u8 bit_width, u32 value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | { |
| 127 | if (bit_width <= 8) { |
| 128 | outb(value, port); |
| 129 | } else if (bit_width <= 16) { |
| 130 | outw(value, port); |
| 131 | } else if (bit_width <= 32) { |
| 132 | outl(value, port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | } |
| 135 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 136 | static void rdport(u16 port, u8 bit_width, u32 * ret) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | { |
| 138 | *ret = 0; |
| 139 | if (bit_width <= 8) { |
| 140 | *ret = inb(port); |
| 141 | } else if (bit_width <= 16) { |
| 142 | *ret = inw(port); |
| 143 | } else if (bit_width <= 32) { |
| 144 | *ret = inl(port); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 145 | } |
| 146 | } |
| 147 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 148 | struct msr_addr { |
| 149 | u32 reg; |
| 150 | }; |
| 151 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 152 | struct io_addr { |
| 153 | u16 port; |
| 154 | u8 bit_width; |
| 155 | }; |
| 156 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 157 | typedef union { |
| 158 | struct msr_addr msr; |
| 159 | struct io_addr io; |
| 160 | } drv_addr_union; |
| 161 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 162 | struct drv_cmd { |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 163 | unsigned int type; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 164 | cpumask_t mask; |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 165 | drv_addr_union addr; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 166 | u32 val; |
| 167 | }; |
| 168 | |
| 169 | static void do_drv_read(struct drv_cmd *cmd) |
| 170 | { |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 171 | u32 h; |
| 172 | |
| 173 | switch (cmd->type) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 174 | case SYSTEM_INTEL_MSR_CAPABLE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 175 | rdmsr(cmd->addr.msr.reg, cmd->val, h); |
| 176 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 177 | case SYSTEM_IO_CAPABLE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 178 | rdport(cmd->addr.io.port, cmd->addr.io.bit_width, &cmd->val); |
| 179 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 180 | default: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 181 | break; |
| 182 | } |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 183 | } |
| 184 | |
| 185 | static void do_drv_write(struct drv_cmd *cmd) |
| 186 | { |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 187 | u32 h = 0; |
| 188 | |
| 189 | switch (cmd->type) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 190 | case SYSTEM_INTEL_MSR_CAPABLE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 191 | wrmsr(cmd->addr.msr.reg, cmd->val, h); |
| 192 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 193 | case SYSTEM_IO_CAPABLE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 194 | wrport(cmd->addr.io.port, cmd->addr.io.bit_width, cmd->val); |
| 195 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 196 | default: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 197 | break; |
| 198 | } |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 199 | } |
| 200 | |
| 201 | static inline void drv_read(struct drv_cmd *cmd) |
| 202 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 203 | cpumask_t saved_mask = current->cpus_allowed; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 204 | cmd->val = 0; |
| 205 | |
| 206 | set_cpus_allowed(current, cmd->mask); |
| 207 | do_drv_read(cmd); |
| 208 | set_cpus_allowed(current, saved_mask); |
| 209 | |
| 210 | } |
| 211 | |
| 212 | static void drv_write(struct drv_cmd *cmd) |
| 213 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 214 | cpumask_t saved_mask = current->cpus_allowed; |
| 215 | unsigned int i; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 216 | |
| 217 | for_each_cpu_mask(i, cmd->mask) { |
| 218 | set_cpus_allowed(current, cpumask_of_cpu(i)); |
| 219 | do_drv_write(cmd); |
| 220 | } |
| 221 | |
| 222 | set_cpus_allowed(current, saved_mask); |
| 223 | return; |
| 224 | } |
| 225 | |
| 226 | static u32 get_cur_val(cpumask_t mask) |
| 227 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 228 | struct acpi_processor_performance *perf; |
| 229 | struct drv_cmd cmd; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 230 | |
| 231 | if (unlikely(cpus_empty(mask))) |
| 232 | return 0; |
| 233 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 234 | switch (drv_data[first_cpu(mask)]->cpu_feature) { |
| 235 | case SYSTEM_INTEL_MSR_CAPABLE: |
| 236 | cmd.type = SYSTEM_INTEL_MSR_CAPABLE; |
| 237 | cmd.addr.msr.reg = MSR_IA32_PERF_STATUS; |
| 238 | break; |
| 239 | case SYSTEM_IO_CAPABLE: |
| 240 | cmd.type = SYSTEM_IO_CAPABLE; |
| 241 | perf = drv_data[first_cpu(mask)]->acpi_data; |
| 242 | cmd.addr.io.port = perf->control_register.address; |
| 243 | cmd.addr.io.bit_width = perf->control_register.bit_width; |
| 244 | break; |
| 245 | default: |
| 246 | return 0; |
| 247 | } |
| 248 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 249 | cmd.mask = mask; |
| 250 | |
| 251 | drv_read(&cmd); |
| 252 | |
| 253 | dprintk("get_cur_val = %u\n", cmd.val); |
| 254 | |
| 255 | return cmd.val; |
| 256 | } |
| 257 | |
| 258 | static unsigned int get_cur_freq_on_cpu(unsigned int cpu) |
| 259 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 260 | struct acpi_cpufreq_data *data = drv_data[cpu]; |
| 261 | unsigned int freq; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 262 | |
| 263 | dprintk("get_cur_freq_on_cpu (%d)\n", cpu); |
| 264 | |
| 265 | if (unlikely(data == NULL || |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 266 | data->acpi_data == NULL || data->freq_table == NULL)) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 267 | return 0; |
| 268 | } |
| 269 | |
| 270 | freq = extract_freq(get_cur_val(cpumask_of_cpu(cpu)), data); |
| 271 | dprintk("cur freq = %u\n", freq); |
| 272 | |
| 273 | return freq; |
| 274 | } |
| 275 | |
| 276 | static unsigned int check_freqs(cpumask_t mask, unsigned int freq, |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 277 | struct acpi_cpufreq_data *data) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 278 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 279 | unsigned int cur_freq; |
| 280 | unsigned int i; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 281 | |
| 282 | for (i = 0; i < 100; i++) { |
| 283 | cur_freq = extract_freq(get_cur_val(mask), data); |
| 284 | if (cur_freq == freq) |
| 285 | return 1; |
| 286 | udelay(10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | } |
| 288 | return 0; |
| 289 | } |
| 290 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 291 | static int acpi_cpufreq_target(struct cpufreq_policy *policy, |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 292 | unsigned int target_freq, unsigned int relation) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 294 | struct acpi_cpufreq_data *data = drv_data[policy->cpu]; |
| 295 | struct acpi_processor_performance *perf; |
| 296 | struct cpufreq_freqs freqs; |
| 297 | cpumask_t online_policy_cpus; |
| 298 | struct drv_cmd cmd; |
| 299 | unsigned int msr; |
| 300 | unsigned int next_state = 0; |
| 301 | unsigned int next_perf_state = 0; |
| 302 | unsigned int i; |
| 303 | int result = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 305 | dprintk("acpi_cpufreq_target %d (%d)\n", target_freq, policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 307 | if (unlikely(data == NULL || |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 308 | data->acpi_data == NULL || data->freq_table == NULL)) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 309 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | } |
| 311 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 312 | perf = data->acpi_data; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 313 | result = cpufreq_frequency_table_target(policy, |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 314 | data->freq_table, |
| 315 | target_freq, |
| 316 | relation, &next_state); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 317 | if (unlikely(result)) |
| 318 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | |
Andrew Morton | 7e1f19e | 2006-03-28 17:03:00 -0500 | [diff] [blame] | 320 | #ifdef CONFIG_HOTPLUG_CPU |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 321 | /* cpufreq holds the hotplug lock, so we are safe from here on */ |
| 322 | cpus_and(online_policy_cpus, cpu_online_map, policy->cpus); |
Andrew Morton | 7e1f19e | 2006-03-28 17:03:00 -0500 | [diff] [blame] | 323 | #else |
| 324 | online_policy_cpus = policy->cpus; |
| 325 | #endif |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 326 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 327 | cmd.val = get_cur_val(online_policy_cpus); |
| 328 | freqs.old = extract_freq(cmd.val, data); |
| 329 | freqs.new = data->freq_table[next_state].frequency; |
| 330 | next_perf_state = data->freq_table[next_state].index; |
| 331 | if (freqs.new == freqs.old) { |
| 332 | if (unlikely(data->resume)) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 333 | dprintk("Called after resume, resetting to P%d\n", |
| 334 | next_perf_state); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 335 | data->resume = 0; |
| 336 | } else { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 337 | dprintk("Already at target state (P%d)\n", |
| 338 | next_perf_state); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 339 | return 0; |
| 340 | } |
| 341 | } |
| 342 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 343 | switch (data->cpu_feature) { |
| 344 | case SYSTEM_INTEL_MSR_CAPABLE: |
| 345 | cmd.type = SYSTEM_INTEL_MSR_CAPABLE; |
| 346 | cmd.addr.msr.reg = MSR_IA32_PERF_CTL; |
| 347 | msr = |
| 348 | (u32) perf->states[next_perf_state]. |
| 349 | control & INTEL_MSR_RANGE; |
| 350 | cmd.val = (cmd.val & ~INTEL_MSR_RANGE) | msr; |
| 351 | break; |
| 352 | case SYSTEM_IO_CAPABLE: |
| 353 | cmd.type = SYSTEM_IO_CAPABLE; |
| 354 | cmd.addr.io.port = perf->control_register.address; |
| 355 | cmd.addr.io.bit_width = perf->control_register.bit_width; |
| 356 | cmd.val = (u32) perf->states[next_perf_state].control; |
| 357 | break; |
| 358 | default: |
| 359 | return -ENODEV; |
| 360 | } |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 361 | |
| 362 | cpus_clear(cmd.mask); |
| 363 | |
| 364 | if (policy->shared_type != CPUFREQ_SHARED_TYPE_ANY) |
| 365 | cmd.mask = online_policy_cpus; |
| 366 | else |
| 367 | cpu_set(policy->cpu, cmd.mask); |
| 368 | |
| 369 | for_each_cpu_mask(i, cmd.mask) { |
| 370 | freqs.cpu = i; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 371 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); |
| 372 | } |
| 373 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 374 | drv_write(&cmd); |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 375 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 376 | if (acpi_pstate_strict) { |
| 377 | if (!check_freqs(cmd.mask, freqs.new, data)) { |
| 378 | dprintk("acpi_cpufreq_target failed (%d)\n", |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 379 | policy->cpu); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 380 | return -EAGAIN; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 381 | } |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 382 | } |
| 383 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 384 | for_each_cpu_mask(i, cmd.mask) { |
| 385 | freqs.cpu = i; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 386 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); |
| 387 | } |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 388 | perf->state = next_perf_state; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 389 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 390 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | } |
| 392 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 393 | static int acpi_cpufreq_verify(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 395 | struct acpi_cpufreq_data *data = drv_data[policy->cpu]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | |
| 397 | dprintk("acpi_cpufreq_verify\n"); |
| 398 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 399 | return cpufreq_frequency_table_verify(policy, data->freq_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | } |
| 401 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | static unsigned long |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 403 | acpi_cpufreq_guess_freq(struct acpi_cpufreq_data *data, unsigned int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 405 | struct acpi_processor_performance *perf = data->acpi_data; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 406 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | if (cpu_khz) { |
| 408 | /* search the closest match to cpu_khz */ |
| 409 | unsigned int i; |
| 410 | unsigned long freq; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 411 | unsigned long freqn = perf->states[0].core_frequency * 1000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 413 | for (i = 0; i < (perf->state_count - 1); i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | freq = freqn; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 415 | freqn = perf->states[i + 1].core_frequency * 1000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | if ((2 * cpu_khz) > (freqn + freq)) { |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 417 | perf->state = i; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 418 | return freq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | } |
| 420 | } |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 421 | perf->state = perf->state_count - 1; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 422 | return freqn; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 423 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | /* assume CPU is at P0... */ |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 425 | perf->state = 0; |
| 426 | return perf->states[0].core_frequency * 1000; |
| 427 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | } |
| 429 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 430 | /* |
| 431 | * acpi_cpufreq_early_init - initialize ACPI P-States library |
| 432 | * |
| 433 | * Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c) |
| 434 | * in order to determine correct frequency and voltage pairings. We can |
| 435 | * do _PDC and _PSD and find out the processor dependency for the |
| 436 | * actual init that will happen later... |
| 437 | */ |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 438 | static int acpi_cpufreq_early_init(void) |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 439 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 440 | struct acpi_processor_performance *data; |
| 441 | cpumask_t covered; |
| 442 | unsigned int i, j; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 443 | |
| 444 | dprintk("acpi_cpufreq_early_init\n"); |
| 445 | |
Andrew Morton | fb1bb34 | 2006-06-25 05:46:43 -0700 | [diff] [blame] | 446 | for_each_possible_cpu(i) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 447 | data = kzalloc(sizeof(struct acpi_processor_performance), |
| 448 | GFP_KERNEL); |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 449 | if (!data) { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 450 | for_each_cpu_mask(j, covered) { |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 451 | kfree(acpi_perf_data[j]); |
| 452 | acpi_perf_data[j] = NULL; |
| 453 | } |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 454 | return -ENOMEM; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 455 | } |
| 456 | acpi_perf_data[i] = data; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 457 | cpu_set(i, covered); |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 458 | } |
| 459 | |
| 460 | /* Do initialization in ACPI core */ |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 461 | acpi_processor_preregister_performance(acpi_perf_data); |
| 462 | return 0; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 463 | } |
| 464 | |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 465 | /* |
| 466 | * Some BIOSes do SW_ANY coordination internally, either set it up in hw |
| 467 | * or do it in BIOS firmware and won't inform about it to OS. If not |
| 468 | * detected, this has a side effect of making CPU run at a different speed |
| 469 | * than OS intended it to run at. Detect it and handle it cleanly. |
| 470 | */ |
| 471 | static int bios_with_sw_any_bug; |
| 472 | |
Venkatesh Pallipadi | 0497c8c | 2006-09-25 11:23:32 -0700 | [diff] [blame] | 473 | static int sw_any_bug_found(struct dmi_system_id *d) |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 474 | { |
| 475 | bios_with_sw_any_bug = 1; |
| 476 | return 0; |
| 477 | } |
| 478 | |
Venkatesh Pallipadi | 0497c8c | 2006-09-25 11:23:32 -0700 | [diff] [blame] | 479 | static struct dmi_system_id sw_any_bug_dmi_table[] = { |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 480 | { |
| 481 | .callback = sw_any_bug_found, |
| 482 | .ident = "Supermicro Server X6DLP", |
| 483 | .matches = { |
| 484 | DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"), |
| 485 | DMI_MATCH(DMI_BIOS_VERSION, "080010"), |
| 486 | DMI_MATCH(DMI_PRODUCT_NAME, "X6DLP"), |
| 487 | }, |
| 488 | }, |
| 489 | { } |
| 490 | }; |
| 491 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 492 | static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 494 | unsigned int i; |
| 495 | unsigned int valid_states = 0; |
| 496 | unsigned int cpu = policy->cpu; |
| 497 | struct acpi_cpufreq_data *data; |
| 498 | unsigned int l, h; |
| 499 | unsigned int result = 0; |
| 500 | struct cpuinfo_x86 *c = &cpu_data[policy->cpu]; |
| 501 | struct acpi_processor_performance *perf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | dprintk("acpi_cpufreq_cpu_init\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 505 | if (!acpi_perf_data[cpu]) |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 506 | return -ENODEV; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 507 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 508 | data = kzalloc(sizeof(struct acpi_cpufreq_data), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | if (!data) |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 510 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 512 | data->acpi_data = acpi_perf_data[cpu]; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 513 | drv_data[cpu] = data; |
| 514 | |
| 515 | if (cpu_has(c, X86_FEATURE_CONSTANT_TSC)) { |
| 516 | acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS; |
| 517 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 519 | result = acpi_processor_register_performance(data->acpi_data, cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | if (result) |
| 521 | goto err_free; |
| 522 | |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 523 | perf = data->acpi_data; |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 524 | policy->shared_type = perf->shared_type; |
Venkatesh Pallipadi | 46f18e3 | 2006-06-26 00:34:43 -0400 | [diff] [blame] | 525 | /* |
| 526 | * Will let policy->cpus know about dependency only when software |
| 527 | * coordination is required. |
| 528 | */ |
| 529 | if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL || |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 530 | policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) { |
Venkatesh Pallipadi | 46f18e3 | 2006-06-26 00:34:43 -0400 | [diff] [blame] | 531 | policy->cpus = perf->shared_cpu_map; |
Venkatesh Pallipadi | 8adcc0c | 2006-09-01 14:02:24 -0700 | [diff] [blame] | 532 | } |
| 533 | |
| 534 | #ifdef CONFIG_SMP |
| 535 | dmi_check_system(sw_any_bug_dmi_table); |
| 536 | if (bios_with_sw_any_bug && cpus_weight(policy->cpus) == 1) { |
| 537 | policy->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
| 538 | policy->cpus = cpu_core_map[cpu]; |
| 539 | } |
| 540 | #endif |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 541 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | /* capability check */ |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 543 | if (perf->state_count <= 1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | dprintk("No P-States\n"); |
| 545 | result = -ENODEV; |
| 546 | goto err_unreg; |
| 547 | } |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 548 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 549 | if (perf->control_register.space_id != perf->status_register.space_id) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | result = -ENODEV; |
| 551 | goto err_unreg; |
| 552 | } |
| 553 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 554 | switch (perf->control_register.space_id) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 555 | case ACPI_ADR_SPACE_SYSTEM_IO: |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 556 | dprintk("SYSTEM IO addr space\n"); |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 557 | data->cpu_feature = SYSTEM_IO_CAPABLE; |
| 558 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 559 | case ACPI_ADR_SPACE_FIXED_HARDWARE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 560 | dprintk("HARDWARE addr space\n"); |
| 561 | if (!check_est_cpu(cpu)) { |
| 562 | result = -ENODEV; |
| 563 | goto err_unreg; |
| 564 | } |
| 565 | data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 566 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 567 | default: |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 568 | dprintk("Unknown addr space %d\n", |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 569 | (u32) (perf->control_register.space_id)); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 570 | result = -ENODEV; |
| 571 | goto err_unreg; |
| 572 | } |
| 573 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 574 | data->freq_table = |
| 575 | kmalloc(sizeof(struct cpufreq_frequency_table) * |
| 576 | (perf->state_count + 1), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | if (!data->freq_table) { |
| 578 | result = -ENOMEM; |
| 579 | goto err_unreg; |
| 580 | } |
| 581 | |
| 582 | /* detect transition latency */ |
| 583 | policy->cpuinfo.transition_latency = 0; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 584 | for (i = 0; i < perf->state_count; i++) { |
| 585 | if ((perf->states[i].transition_latency * 1000) > |
| 586 | policy->cpuinfo.transition_latency) |
| 587 | policy->cpuinfo.transition_latency = |
| 588 | perf->states[i].transition_latency * 1000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | } |
| 590 | policy->governor = CPUFREQ_DEFAULT_GOVERNOR; |
| 591 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | /* table init */ |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 593 | for (i = 0; i < perf->state_count; i++) { |
| 594 | if (i > 0 && perf->states[i].core_frequency == |
| 595 | perf->states[i - 1].core_frequency) |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 596 | continue; |
| 597 | |
| 598 | data->freq_table[valid_states].index = i; |
| 599 | data->freq_table[valid_states].frequency = |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 600 | perf->states[i].core_frequency * 1000; |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 601 | valid_states++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | } |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 603 | data->freq_table[perf->state_count].frequency = CPUFREQ_TABLE_END; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | |
| 605 | result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table); |
| 606 | if (result) { |
| 607 | goto err_freqfree; |
| 608 | } |
| 609 | |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 610 | switch (data->cpu_feature) { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 611 | case ACPI_ADR_SPACE_SYSTEM_IO: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 612 | /* Current speed is unknown and not detectable by IO port */ |
| 613 | policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu); |
| 614 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 615 | case ACPI_ADR_SPACE_FIXED_HARDWARE: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 616 | get_cur_freq_on_cpu(cpu); |
| 617 | break; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 618 | default: |
Venkatesh Pallipadi | dde9f7b | 2006-10-03 12:33:14 -0700 | [diff] [blame] | 619 | break; |
| 620 | } |
| 621 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | /* notify BIOS that we exist */ |
| 623 | acpi_processor_notify_smm(THIS_MODULE); |
| 624 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 625 | dprintk("CPU%u - ACPI performance management activated.\n", cpu); |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 626 | for (i = 0; i < perf->state_count; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | dprintk(" %cP%d: %d MHz, %d mW, %d uS\n", |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 628 | (i == perf->state ? '*' : ' '), i, |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 629 | (u32) perf->states[i].core_frequency, |
| 630 | (u32) perf->states[i].power, |
| 631 | (u32) perf->states[i].transition_latency); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | |
| 633 | cpufreq_frequency_table_get_attr(data->freq_table, policy->cpu); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 634 | |
Dominik Brodowski | 4b31e77 | 2005-05-18 13:49:00 -0400 | [diff] [blame] | 635 | /* |
| 636 | * the first call to ->target() should result in us actually |
| 637 | * writing something to the appropriate registers. |
| 638 | */ |
| 639 | data->resume = 1; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 640 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 641 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 643 | err_freqfree: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | kfree(data->freq_table); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 645 | err_unreg: |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 646 | acpi_processor_unregister_performance(perf, cpu); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 647 | err_free: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | kfree(data); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 649 | drv_data[cpu] = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 651 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | } |
| 653 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 654 | static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 656 | struct acpi_cpufreq_data *data = drv_data[policy->cpu]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | dprintk("acpi_cpufreq_cpu_exit\n"); |
| 659 | |
| 660 | if (data) { |
| 661 | cpufreq_frequency_table_put_attr(policy->cpu); |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 662 | drv_data[policy->cpu] = NULL; |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 663 | acpi_processor_unregister_performance(data->acpi_data, |
| 664 | policy->cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | kfree(data); |
| 666 | } |
| 667 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 668 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | } |
| 670 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 671 | static int acpi_cpufreq_resume(struct cpufreq_policy *policy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | { |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 673 | struct acpi_cpufreq_data *data = drv_data[policy->cpu]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | dprintk("acpi_cpufreq_resume\n"); |
| 676 | |
| 677 | data->resume = 1; |
| 678 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 679 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | } |
| 681 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 682 | static struct freq_attr *acpi_cpufreq_attr[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | &cpufreq_freq_attr_scaling_available_freqs, |
| 684 | NULL, |
| 685 | }; |
| 686 | |
| 687 | static struct cpufreq_driver acpi_cpufreq_driver = { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 688 | .verify = acpi_cpufreq_verify, |
| 689 | .target = acpi_cpufreq_target, |
| 690 | .get = get_cur_freq_on_cpu, |
| 691 | .init = acpi_cpufreq_cpu_init, |
| 692 | .exit = acpi_cpufreq_cpu_exit, |
| 693 | .resume = acpi_cpufreq_resume, |
| 694 | .name = "acpi-cpufreq", |
| 695 | .owner = THIS_MODULE, |
| 696 | .attr = acpi_cpufreq_attr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | }; |
| 698 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 699 | static int __init acpi_cpufreq_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | dprintk("acpi_cpufreq_init\n"); |
| 702 | |
Venkatesh Pallipadi | fe27cb3 | 2006-10-03 12:29:15 -0700 | [diff] [blame] | 703 | acpi_cpufreq_early_init(); |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 704 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 705 | return cpufreq_register_driver(&acpi_cpufreq_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | } |
| 707 | |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 708 | static void __exit acpi_cpufreq_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | { |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 710 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | dprintk("acpi_cpufreq_exit\n"); |
| 712 | |
| 713 | cpufreq_unregister_driver(&acpi_cpufreq_driver); |
| 714 | |
Andrew Morton | fb1bb34 | 2006-06-25 05:46:43 -0700 | [diff] [blame] | 715 | for_each_possible_cpu(i) { |
Venkatesh Pallipadi | 09b4d1e | 2005-12-14 15:05:00 -0500 | [diff] [blame] | 716 | kfree(acpi_perf_data[i]); |
| 717 | acpi_perf_data[i] = NULL; |
| 718 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | return; |
| 720 | } |
| 721 | |
Venkatesh Pallipadi | d395bf1 | 2005-08-25 15:59:00 -0400 | [diff] [blame] | 722 | module_param(acpi_pstate_strict, uint, 0644); |
Venkatesh Pallipadi | 64be7ee | 2006-10-03 12:35:23 -0700 | [diff] [blame^] | 723 | MODULE_PARM_DESC(acpi_pstate_strict, |
| 724 | "value 0 or non-zero. non-zero -> strict ACPI checks are performed during frequency changes."); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | |
| 726 | late_initcall(acpi_cpufreq_init); |
| 727 | module_exit(acpi_cpufreq_exit); |
| 728 | |
| 729 | MODULE_ALIAS("acpi"); |