Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
3a58df35 | 2 | * acpi-cpufreq.c - ACPI Processor P-States Driver |
1da177e4 LT |
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> | |
fe27cb35 | 7 | * Copyright (C) 2006 Denis Sadykov <denis.m.sadykov@intel.com> |
1da177e4 LT |
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 | ||
1da177e4 LT |
28 | #include <linux/kernel.h> |
29 | #include <linux/module.h> | |
30 | #include <linux/init.h> | |
fe27cb35 VP |
31 | #include <linux/smp.h> |
32 | #include <linux/sched.h> | |
1da177e4 | 33 | #include <linux/cpufreq.h> |
d395bf12 | 34 | #include <linux/compiler.h> |
8adcc0c6 | 35 | #include <linux/dmi.h> |
5a0e3ad6 | 36 | #include <linux/slab.h> |
1da177e4 LT |
37 | |
38 | #include <linux/acpi.h> | |
3a58df35 DJ |
39 | #include <linux/io.h> |
40 | #include <linux/delay.h> | |
41 | #include <linux/uaccess.h> | |
42 | ||
1da177e4 LT |
43 | #include <acpi/processor.h> |
44 | ||
dde9f7ba | 45 | #include <asm/msr.h> |
fe27cb35 VP |
46 | #include <asm/processor.h> |
47 | #include <asm/cpufeature.h> | |
a2fed573 | 48 | #include "mperf.h" |
fe27cb35 | 49 | |
1da177e4 LT |
50 | MODULE_AUTHOR("Paul Diefenbaugh, Dominik Brodowski"); |
51 | MODULE_DESCRIPTION("ACPI Processor P-States Driver"); | |
52 | MODULE_LICENSE("GPL"); | |
53 | ||
acd31624 AP |
54 | #define PFX "acpi-cpufreq: " |
55 | ||
dde9f7ba VP |
56 | enum { |
57 | UNDEFINED_CAPABLE = 0, | |
58 | SYSTEM_INTEL_MSR_CAPABLE, | |
3dc9a633 | 59 | SYSTEM_AMD_MSR_CAPABLE, |
dde9f7ba VP |
60 | SYSTEM_IO_CAPABLE, |
61 | }; | |
62 | ||
63 | #define INTEL_MSR_RANGE (0xffff) | |
3dc9a633 | 64 | #define AMD_MSR_RANGE (0x7) |
dde9f7ba | 65 | |
615b7300 AP |
66 | #define MSR_K7_HWCR_CPB_DIS (1ULL << 25) |
67 | ||
fe27cb35 | 68 | struct acpi_cpufreq_data { |
64be7eed VP |
69 | struct acpi_processor_performance *acpi_data; |
70 | struct cpufreq_frequency_table *freq_table; | |
71 | unsigned int resume; | |
72 | unsigned int cpu_feature; | |
1da177e4 LT |
73 | }; |
74 | ||
f1625066 | 75 | static DEFINE_PER_CPU(struct acpi_cpufreq_data *, acfreq_data); |
ea348f3e | 76 | |
50109292 | 77 | /* acpi_perf_data is a pointer to percpu data. */ |
3f6c4df7 | 78 | static struct acpi_processor_performance __percpu *acpi_perf_data; |
1da177e4 LT |
79 | |
80 | static struct cpufreq_driver acpi_cpufreq_driver; | |
81 | ||
d395bf12 | 82 | static unsigned int acpi_pstate_strict; |
615b7300 AP |
83 | static bool boost_enabled, boost_supported; |
84 | static struct msr __percpu *msrs; | |
85 | ||
86 | static bool boost_state(unsigned int cpu) | |
87 | { | |
88 | u32 lo, hi; | |
89 | u64 msr; | |
90 | ||
91 | switch (boot_cpu_data.x86_vendor) { | |
92 | case X86_VENDOR_INTEL: | |
93 | rdmsr_on_cpu(cpu, MSR_IA32_MISC_ENABLE, &lo, &hi); | |
94 | msr = lo | ((u64)hi << 32); | |
95 | return !(msr & MSR_IA32_MISC_ENABLE_TURBO_DISABLE); | |
96 | case X86_VENDOR_AMD: | |
97 | rdmsr_on_cpu(cpu, MSR_K7_HWCR, &lo, &hi); | |
98 | msr = lo | ((u64)hi << 32); | |
99 | return !(msr & MSR_K7_HWCR_CPB_DIS); | |
100 | } | |
101 | return false; | |
102 | } | |
103 | ||
104 | static void boost_set_msrs(bool enable, const struct cpumask *cpumask) | |
105 | { | |
106 | u32 cpu; | |
107 | u32 msr_addr; | |
108 | u64 msr_mask; | |
109 | ||
110 | switch (boot_cpu_data.x86_vendor) { | |
111 | case X86_VENDOR_INTEL: | |
112 | msr_addr = MSR_IA32_MISC_ENABLE; | |
113 | msr_mask = MSR_IA32_MISC_ENABLE_TURBO_DISABLE; | |
114 | break; | |
115 | case X86_VENDOR_AMD: | |
116 | msr_addr = MSR_K7_HWCR; | |
117 | msr_mask = MSR_K7_HWCR_CPB_DIS; | |
118 | break; | |
119 | default: | |
120 | return; | |
121 | } | |
122 | ||
123 | rdmsr_on_cpus(cpumask, msr_addr, msrs); | |
124 | ||
125 | for_each_cpu(cpu, cpumask) { | |
126 | struct msr *reg = per_cpu_ptr(msrs, cpu); | |
127 | if (enable) | |
128 | reg->q &= ~msr_mask; | |
129 | else | |
130 | reg->q |= msr_mask; | |
131 | } | |
132 | ||
133 | wrmsr_on_cpus(cpumask, msr_addr, msrs); | |
134 | } | |
135 | ||
11269ff5 | 136 | static ssize_t _store_boost(const char *buf, size_t count) |
615b7300 AP |
137 | { |
138 | int ret; | |
139 | unsigned long val = 0; | |
140 | ||
141 | if (!boost_supported) | |
142 | return -EINVAL; | |
143 | ||
144 | ret = kstrtoul(buf, 10, &val); | |
145 | if (ret || (val > 1)) | |
146 | return -EINVAL; | |
147 | ||
148 | if ((val && boost_enabled) || (!val && !boost_enabled)) | |
149 | return count; | |
150 | ||
151 | get_online_cpus(); | |
152 | ||
153 | boost_set_msrs(val, cpu_online_mask); | |
154 | ||
155 | put_online_cpus(); | |
156 | ||
157 | boost_enabled = val; | |
158 | pr_debug("Core Boosting %sabled.\n", val ? "en" : "dis"); | |
159 | ||
160 | return count; | |
161 | } | |
162 | ||
11269ff5 AP |
163 | static ssize_t store_global_boost(struct kobject *kobj, struct attribute *attr, |
164 | const char *buf, size_t count) | |
165 | { | |
166 | return _store_boost(buf, count); | |
167 | } | |
168 | ||
615b7300 AP |
169 | static ssize_t show_global_boost(struct kobject *kobj, |
170 | struct attribute *attr, char *buf) | |
171 | { | |
172 | return sprintf(buf, "%u\n", boost_enabled); | |
173 | } | |
174 | ||
175 | static struct global_attr global_boost = __ATTR(boost, 0644, | |
176 | show_global_boost, | |
177 | store_global_boost); | |
d395bf12 | 178 | |
11269ff5 AP |
179 | #ifdef CONFIG_X86_ACPI_CPUFREQ_CPB |
180 | static ssize_t store_cpb(struct cpufreq_policy *policy, const char *buf, | |
181 | size_t count) | |
182 | { | |
183 | return _store_boost(buf, count); | |
184 | } | |
185 | ||
186 | static ssize_t show_cpb(struct cpufreq_policy *policy, char *buf) | |
187 | { | |
188 | return sprintf(buf, "%u\n", boost_enabled); | |
189 | } | |
190 | ||
191 | static struct freq_attr cpb = __ATTR(cpb, 0644, show_cpb, store_cpb); | |
192 | #endif | |
193 | ||
dde9f7ba VP |
194 | static int check_est_cpu(unsigned int cpuid) |
195 | { | |
92cb7612 | 196 | struct cpuinfo_x86 *cpu = &cpu_data(cpuid); |
dde9f7ba | 197 | |
0de51088 | 198 | return cpu_has(cpu, X86_FEATURE_EST); |
dde9f7ba VP |
199 | } |
200 | ||
3dc9a633 MG |
201 | static int check_amd_hwpstate_cpu(unsigned int cpuid) |
202 | { | |
203 | struct cpuinfo_x86 *cpu = &cpu_data(cpuid); | |
204 | ||
205 | return cpu_has(cpu, X86_FEATURE_HW_PSTATE); | |
206 | } | |
207 | ||
dde9f7ba | 208 | static unsigned extract_io(u32 value, struct acpi_cpufreq_data *data) |
fe27cb35 | 209 | { |
64be7eed VP |
210 | struct acpi_processor_performance *perf; |
211 | int i; | |
fe27cb35 VP |
212 | |
213 | perf = data->acpi_data; | |
214 | ||
3a58df35 | 215 | for (i = 0; i < perf->state_count; i++) { |
fe27cb35 VP |
216 | if (value == perf->states[i].status) |
217 | return data->freq_table[i].frequency; | |
218 | } | |
219 | return 0; | |
220 | } | |
221 | ||
dde9f7ba VP |
222 | static unsigned extract_msr(u32 msr, struct acpi_cpufreq_data *data) |
223 | { | |
224 | int i; | |
a6f6e6e6 | 225 | struct acpi_processor_performance *perf; |
dde9f7ba | 226 | |
3dc9a633 MG |
227 | if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) |
228 | msr &= AMD_MSR_RANGE; | |
229 | else | |
230 | msr &= INTEL_MSR_RANGE; | |
231 | ||
a6f6e6e6 VP |
232 | perf = data->acpi_data; |
233 | ||
3a58df35 | 234 | for (i = 0; data->freq_table[i].frequency != CPUFREQ_TABLE_END; i++) { |
a6f6e6e6 | 235 | if (msr == perf->states[data->freq_table[i].index].status) |
dde9f7ba VP |
236 | return data->freq_table[i].frequency; |
237 | } | |
238 | return data->freq_table[0].frequency; | |
239 | } | |
240 | ||
dde9f7ba VP |
241 | static unsigned extract_freq(u32 val, struct acpi_cpufreq_data *data) |
242 | { | |
243 | switch (data->cpu_feature) { | |
64be7eed | 244 | case SYSTEM_INTEL_MSR_CAPABLE: |
3dc9a633 | 245 | case SYSTEM_AMD_MSR_CAPABLE: |
dde9f7ba | 246 | return extract_msr(val, data); |
64be7eed | 247 | case SYSTEM_IO_CAPABLE: |
dde9f7ba | 248 | return extract_io(val, data); |
64be7eed | 249 | default: |
dde9f7ba VP |
250 | return 0; |
251 | } | |
252 | } | |
253 | ||
dde9f7ba VP |
254 | struct msr_addr { |
255 | u32 reg; | |
256 | }; | |
257 | ||
fe27cb35 VP |
258 | struct io_addr { |
259 | u16 port; | |
260 | u8 bit_width; | |
261 | }; | |
262 | ||
263 | struct drv_cmd { | |
dde9f7ba | 264 | unsigned int type; |
bfa318ad | 265 | const struct cpumask *mask; |
3a58df35 DJ |
266 | union { |
267 | struct msr_addr msr; | |
268 | struct io_addr io; | |
269 | } addr; | |
fe27cb35 VP |
270 | u32 val; |
271 | }; | |
272 | ||
01599fca AM |
273 | /* Called via smp_call_function_single(), on the target CPU */ |
274 | static void do_drv_read(void *_cmd) | |
1da177e4 | 275 | { |
72859081 | 276 | struct drv_cmd *cmd = _cmd; |
dde9f7ba VP |
277 | u32 h; |
278 | ||
279 | switch (cmd->type) { | |
64be7eed | 280 | case SYSTEM_INTEL_MSR_CAPABLE: |
3dc9a633 | 281 | case SYSTEM_AMD_MSR_CAPABLE: |
dde9f7ba VP |
282 | rdmsr(cmd->addr.msr.reg, cmd->val, h); |
283 | break; | |
64be7eed | 284 | case SYSTEM_IO_CAPABLE: |
4e581ff1 VP |
285 | acpi_os_read_port((acpi_io_address)cmd->addr.io.port, |
286 | &cmd->val, | |
287 | (u32)cmd->addr.io.bit_width); | |
dde9f7ba | 288 | break; |
64be7eed | 289 | default: |
dde9f7ba VP |
290 | break; |
291 | } | |
fe27cb35 | 292 | } |
1da177e4 | 293 | |
01599fca AM |
294 | /* Called via smp_call_function_many(), on the target CPUs */ |
295 | static void do_drv_write(void *_cmd) | |
fe27cb35 | 296 | { |
72859081 | 297 | struct drv_cmd *cmd = _cmd; |
13424f65 | 298 | u32 lo, hi; |
dde9f7ba VP |
299 | |
300 | switch (cmd->type) { | |
64be7eed | 301 | case SYSTEM_INTEL_MSR_CAPABLE: |
13424f65 VP |
302 | rdmsr(cmd->addr.msr.reg, lo, hi); |
303 | lo = (lo & ~INTEL_MSR_RANGE) | (cmd->val & INTEL_MSR_RANGE); | |
304 | wrmsr(cmd->addr.msr.reg, lo, hi); | |
dde9f7ba | 305 | break; |
3dc9a633 MG |
306 | case SYSTEM_AMD_MSR_CAPABLE: |
307 | wrmsr(cmd->addr.msr.reg, cmd->val, 0); | |
308 | break; | |
64be7eed | 309 | case SYSTEM_IO_CAPABLE: |
4e581ff1 VP |
310 | acpi_os_write_port((acpi_io_address)cmd->addr.io.port, |
311 | cmd->val, | |
312 | (u32)cmd->addr.io.bit_width); | |
dde9f7ba | 313 | break; |
64be7eed | 314 | default: |
dde9f7ba VP |
315 | break; |
316 | } | |
fe27cb35 | 317 | } |
1da177e4 | 318 | |
95dd7227 | 319 | static void drv_read(struct drv_cmd *cmd) |
fe27cb35 | 320 | { |
4a28395d | 321 | int err; |
fe27cb35 VP |
322 | cmd->val = 0; |
323 | ||
4a28395d AM |
324 | err = smp_call_function_any(cmd->mask, do_drv_read, cmd, 1); |
325 | WARN_ON_ONCE(err); /* smp_call_function_any() was buggy? */ | |
fe27cb35 VP |
326 | } |
327 | ||
328 | static void drv_write(struct drv_cmd *cmd) | |
329 | { | |
ea34f43a LT |
330 | int this_cpu; |
331 | ||
332 | this_cpu = get_cpu(); | |
333 | if (cpumask_test_cpu(this_cpu, cmd->mask)) | |
334 | do_drv_write(cmd); | |
01599fca | 335 | smp_call_function_many(cmd->mask, do_drv_write, cmd, 1); |
ea34f43a | 336 | put_cpu(); |
fe27cb35 | 337 | } |
1da177e4 | 338 | |
4d8bb537 | 339 | static u32 get_cur_val(const struct cpumask *mask) |
fe27cb35 | 340 | { |
64be7eed VP |
341 | struct acpi_processor_performance *perf; |
342 | struct drv_cmd cmd; | |
1da177e4 | 343 | |
4d8bb537 | 344 | if (unlikely(cpumask_empty(mask))) |
fe27cb35 | 345 | return 0; |
1da177e4 | 346 | |
f1625066 | 347 | switch (per_cpu(acfreq_data, cpumask_first(mask))->cpu_feature) { |
dde9f7ba VP |
348 | case SYSTEM_INTEL_MSR_CAPABLE: |
349 | cmd.type = SYSTEM_INTEL_MSR_CAPABLE; | |
350 | cmd.addr.msr.reg = MSR_IA32_PERF_STATUS; | |
351 | break; | |
3dc9a633 MG |
352 | case SYSTEM_AMD_MSR_CAPABLE: |
353 | cmd.type = SYSTEM_AMD_MSR_CAPABLE; | |
354 | cmd.addr.msr.reg = MSR_AMD_PERF_STATUS; | |
355 | break; | |
dde9f7ba VP |
356 | case SYSTEM_IO_CAPABLE: |
357 | cmd.type = SYSTEM_IO_CAPABLE; | |
f1625066 | 358 | perf = per_cpu(acfreq_data, cpumask_first(mask))->acpi_data; |
dde9f7ba VP |
359 | cmd.addr.io.port = perf->control_register.address; |
360 | cmd.addr.io.bit_width = perf->control_register.bit_width; | |
361 | break; | |
362 | default: | |
363 | return 0; | |
364 | } | |
365 | ||
bfa318ad | 366 | cmd.mask = mask; |
fe27cb35 | 367 | drv_read(&cmd); |
1da177e4 | 368 | |
2d06d8c4 | 369 | pr_debug("get_cur_val = %u\n", cmd.val); |
fe27cb35 VP |
370 | |
371 | return cmd.val; | |
372 | } | |
1da177e4 | 373 | |
fe27cb35 VP |
374 | static unsigned int get_cur_freq_on_cpu(unsigned int cpu) |
375 | { | |
f1625066 | 376 | struct acpi_cpufreq_data *data = per_cpu(acfreq_data, cpu); |
64be7eed | 377 | unsigned int freq; |
e56a727b | 378 | unsigned int cached_freq; |
fe27cb35 | 379 | |
2d06d8c4 | 380 | pr_debug("get_cur_freq_on_cpu (%d)\n", cpu); |
fe27cb35 VP |
381 | |
382 | if (unlikely(data == NULL || | |
64be7eed | 383 | data->acpi_data == NULL || data->freq_table == NULL)) { |
fe27cb35 | 384 | return 0; |
1da177e4 LT |
385 | } |
386 | ||
e56a727b | 387 | cached_freq = data->freq_table[data->acpi_data->state].frequency; |
e39ad415 | 388 | freq = extract_freq(get_cur_val(cpumask_of(cpu)), data); |
e56a727b VP |
389 | if (freq != cached_freq) { |
390 | /* | |
391 | * The dreaded BIOS frequency change behind our back. | |
392 | * Force set the frequency on next target call. | |
393 | */ | |
394 | data->resume = 1; | |
395 | } | |
396 | ||
2d06d8c4 | 397 | pr_debug("cur freq = %u\n", freq); |
1da177e4 | 398 | |
fe27cb35 | 399 | return freq; |
1da177e4 LT |
400 | } |
401 | ||
72859081 | 402 | static unsigned int check_freqs(const struct cpumask *mask, unsigned int freq, |
64be7eed | 403 | struct acpi_cpufreq_data *data) |
fe27cb35 | 404 | { |
64be7eed VP |
405 | unsigned int cur_freq; |
406 | unsigned int i; | |
1da177e4 | 407 | |
3a58df35 | 408 | for (i = 0; i < 100; i++) { |
fe27cb35 VP |
409 | cur_freq = extract_freq(get_cur_val(mask), data); |
410 | if (cur_freq == freq) | |
411 | return 1; | |
412 | udelay(10); | |
413 | } | |
414 | return 0; | |
415 | } | |
416 | ||
417 | static int acpi_cpufreq_target(struct cpufreq_policy *policy, | |
64be7eed | 418 | unsigned int target_freq, unsigned int relation) |
1da177e4 | 419 | { |
f1625066 | 420 | struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu); |
64be7eed VP |
421 | struct acpi_processor_performance *perf; |
422 | struct cpufreq_freqs freqs; | |
64be7eed | 423 | struct drv_cmd cmd; |
8edc59d9 VP |
424 | unsigned int next_state = 0; /* Index into freq_table */ |
425 | unsigned int next_perf_state = 0; /* Index into perf table */ | |
64be7eed VP |
426 | unsigned int i; |
427 | int result = 0; | |
fe27cb35 | 428 | |
2d06d8c4 | 429 | pr_debug("acpi_cpufreq_target %d (%d)\n", target_freq, policy->cpu); |
fe27cb35 VP |
430 | |
431 | if (unlikely(data == NULL || | |
95dd7227 | 432 | data->acpi_data == NULL || data->freq_table == NULL)) { |
fe27cb35 VP |
433 | return -ENODEV; |
434 | } | |
1da177e4 | 435 | |
fe27cb35 | 436 | perf = data->acpi_data; |
1da177e4 | 437 | result = cpufreq_frequency_table_target(policy, |
64be7eed VP |
438 | data->freq_table, |
439 | target_freq, | |
440 | relation, &next_state); | |
4d8bb537 MT |
441 | if (unlikely(result)) { |
442 | result = -ENODEV; | |
443 | goto out; | |
444 | } | |
1da177e4 | 445 | |
fe27cb35 | 446 | next_perf_state = data->freq_table[next_state].index; |
7650b281 | 447 | if (perf->state == next_perf_state) { |
fe27cb35 | 448 | if (unlikely(data->resume)) { |
2d06d8c4 | 449 | pr_debug("Called after resume, resetting to P%d\n", |
64be7eed | 450 | next_perf_state); |
fe27cb35 VP |
451 | data->resume = 0; |
452 | } else { | |
2d06d8c4 | 453 | pr_debug("Already at target state (P%d)\n", |
64be7eed | 454 | next_perf_state); |
4d8bb537 | 455 | goto out; |
fe27cb35 | 456 | } |
09b4d1ee VP |
457 | } |
458 | ||
64be7eed VP |
459 | switch (data->cpu_feature) { |
460 | case SYSTEM_INTEL_MSR_CAPABLE: | |
461 | cmd.type = SYSTEM_INTEL_MSR_CAPABLE; | |
462 | cmd.addr.msr.reg = MSR_IA32_PERF_CTL; | |
13424f65 | 463 | cmd.val = (u32) perf->states[next_perf_state].control; |
64be7eed | 464 | break; |
3dc9a633 MG |
465 | case SYSTEM_AMD_MSR_CAPABLE: |
466 | cmd.type = SYSTEM_AMD_MSR_CAPABLE; | |
467 | cmd.addr.msr.reg = MSR_AMD_PERF_CTL; | |
468 | cmd.val = (u32) perf->states[next_perf_state].control; | |
469 | break; | |
64be7eed VP |
470 | case SYSTEM_IO_CAPABLE: |
471 | cmd.type = SYSTEM_IO_CAPABLE; | |
472 | cmd.addr.io.port = perf->control_register.address; | |
473 | cmd.addr.io.bit_width = perf->control_register.bit_width; | |
474 | cmd.val = (u32) perf->states[next_perf_state].control; | |
475 | break; | |
476 | default: | |
4d8bb537 MT |
477 | result = -ENODEV; |
478 | goto out; | |
64be7eed | 479 | } |
09b4d1ee | 480 | |
4d8bb537 | 481 | /* cpufreq holds the hotplug lock, so we are safe from here on */ |
fe27cb35 | 482 | if (policy->shared_type != CPUFREQ_SHARED_TYPE_ANY) |
bfa318ad | 483 | cmd.mask = policy->cpus; |
fe27cb35 | 484 | else |
bfa318ad | 485 | cmd.mask = cpumask_of(policy->cpu); |
09b4d1ee | 486 | |
8edc59d9 VP |
487 | freqs.old = perf->states[perf->state].core_frequency * 1000; |
488 | freqs.new = data->freq_table[next_state].frequency; | |
6b72e393 | 489 | for_each_cpu(i, policy->cpus) { |
fe27cb35 VP |
490 | freqs.cpu = i; |
491 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); | |
09b4d1ee | 492 | } |
1da177e4 | 493 | |
fe27cb35 | 494 | drv_write(&cmd); |
09b4d1ee | 495 | |
fe27cb35 | 496 | if (acpi_pstate_strict) { |
4d8bb537 | 497 | if (!check_freqs(cmd.mask, freqs.new, data)) { |
2d06d8c4 | 498 | pr_debug("acpi_cpufreq_target failed (%d)\n", |
64be7eed | 499 | policy->cpu); |
4d8bb537 MT |
500 | result = -EAGAIN; |
501 | goto out; | |
09b4d1ee VP |
502 | } |
503 | } | |
504 | ||
6b72e393 | 505 | for_each_cpu(i, policy->cpus) { |
fe27cb35 VP |
506 | freqs.cpu = i; |
507 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); | |
508 | } | |
509 | perf->state = next_perf_state; | |
510 | ||
4d8bb537 | 511 | out: |
fe27cb35 | 512 | return result; |
1da177e4 LT |
513 | } |
514 | ||
64be7eed | 515 | static int acpi_cpufreq_verify(struct cpufreq_policy *policy) |
1da177e4 | 516 | { |
f1625066 | 517 | struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu); |
1da177e4 | 518 | |
2d06d8c4 | 519 | pr_debug("acpi_cpufreq_verify\n"); |
1da177e4 | 520 | |
fe27cb35 | 521 | return cpufreq_frequency_table_verify(policy, data->freq_table); |
1da177e4 LT |
522 | } |
523 | ||
1da177e4 | 524 | static unsigned long |
64be7eed | 525 | acpi_cpufreq_guess_freq(struct acpi_cpufreq_data *data, unsigned int cpu) |
1da177e4 | 526 | { |
64be7eed | 527 | struct acpi_processor_performance *perf = data->acpi_data; |
09b4d1ee | 528 | |
1da177e4 LT |
529 | if (cpu_khz) { |
530 | /* search the closest match to cpu_khz */ | |
531 | unsigned int i; | |
532 | unsigned long freq; | |
09b4d1ee | 533 | unsigned long freqn = perf->states[0].core_frequency * 1000; |
1da177e4 | 534 | |
3a58df35 | 535 | for (i = 0; i < (perf->state_count-1); i++) { |
1da177e4 | 536 | freq = freqn; |
95dd7227 | 537 | freqn = perf->states[i+1].core_frequency * 1000; |
1da177e4 | 538 | if ((2 * cpu_khz) > (freqn + freq)) { |
09b4d1ee | 539 | perf->state = i; |
64be7eed | 540 | return freq; |
1da177e4 LT |
541 | } |
542 | } | |
95dd7227 | 543 | perf->state = perf->state_count-1; |
64be7eed | 544 | return freqn; |
09b4d1ee | 545 | } else { |
1da177e4 | 546 | /* assume CPU is at P0... */ |
09b4d1ee VP |
547 | perf->state = 0; |
548 | return perf->states[0].core_frequency * 1000; | |
549 | } | |
1da177e4 LT |
550 | } |
551 | ||
2fdf66b4 RR |
552 | static void free_acpi_perf_data(void) |
553 | { | |
554 | unsigned int i; | |
555 | ||
556 | /* Freeing a NULL pointer is OK, and alloc_percpu zeroes. */ | |
557 | for_each_possible_cpu(i) | |
558 | free_cpumask_var(per_cpu_ptr(acpi_perf_data, i) | |
559 | ->shared_cpu_map); | |
560 | free_percpu(acpi_perf_data); | |
561 | } | |
562 | ||
615b7300 AP |
563 | static int boost_notify(struct notifier_block *nb, unsigned long action, |
564 | void *hcpu) | |
565 | { | |
566 | unsigned cpu = (long)hcpu; | |
567 | const struct cpumask *cpumask; | |
568 | ||
569 | cpumask = get_cpu_mask(cpu); | |
570 | ||
571 | /* | |
572 | * Clear the boost-disable bit on the CPU_DOWN path so that | |
573 | * this cpu cannot block the remaining ones from boosting. On | |
574 | * the CPU_UP path we simply keep the boost-disable flag in | |
575 | * sync with the current global state. | |
576 | */ | |
577 | ||
578 | switch (action) { | |
579 | case CPU_UP_PREPARE: | |
580 | case CPU_UP_PREPARE_FROZEN: | |
581 | boost_set_msrs(boost_enabled, cpumask); | |
582 | break; | |
583 | ||
584 | case CPU_DOWN_PREPARE: | |
585 | case CPU_DOWN_PREPARE_FROZEN: | |
586 | boost_set_msrs(1, cpumask); | |
587 | break; | |
588 | ||
589 | default: | |
590 | break; | |
591 | } | |
592 | ||
593 | return NOTIFY_OK; | |
594 | } | |
595 | ||
596 | ||
597 | static struct notifier_block boost_nb = { | |
598 | .notifier_call = boost_notify, | |
599 | }; | |
600 | ||
09b4d1ee VP |
601 | /* |
602 | * acpi_cpufreq_early_init - initialize ACPI P-States library | |
603 | * | |
604 | * Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c) | |
605 | * in order to determine correct frequency and voltage pairings. We can | |
606 | * do _PDC and _PSD and find out the processor dependency for the | |
607 | * actual init that will happen later... | |
608 | */ | |
50109292 | 609 | static int __init acpi_cpufreq_early_init(void) |
09b4d1ee | 610 | { |
2fdf66b4 | 611 | unsigned int i; |
2d06d8c4 | 612 | pr_debug("acpi_cpufreq_early_init\n"); |
09b4d1ee | 613 | |
50109292 FY |
614 | acpi_perf_data = alloc_percpu(struct acpi_processor_performance); |
615 | if (!acpi_perf_data) { | |
2d06d8c4 | 616 | pr_debug("Memory allocation error for acpi_perf_data.\n"); |
50109292 | 617 | return -ENOMEM; |
09b4d1ee | 618 | } |
2fdf66b4 | 619 | for_each_possible_cpu(i) { |
eaa95840 | 620 | if (!zalloc_cpumask_var_node( |
80855f73 MT |
621 | &per_cpu_ptr(acpi_perf_data, i)->shared_cpu_map, |
622 | GFP_KERNEL, cpu_to_node(i))) { | |
2fdf66b4 RR |
623 | |
624 | /* Freeing a NULL pointer is OK: alloc_percpu zeroes. */ | |
625 | free_acpi_perf_data(); | |
626 | return -ENOMEM; | |
627 | } | |
628 | } | |
09b4d1ee VP |
629 | |
630 | /* Do initialization in ACPI core */ | |
fe27cb35 VP |
631 | acpi_processor_preregister_performance(acpi_perf_data); |
632 | return 0; | |
09b4d1ee VP |
633 | } |
634 | ||
95625b8f | 635 | #ifdef CONFIG_SMP |
8adcc0c6 VP |
636 | /* |
637 | * Some BIOSes do SW_ANY coordination internally, either set it up in hw | |
638 | * or do it in BIOS firmware and won't inform about it to OS. If not | |
639 | * detected, this has a side effect of making CPU run at a different speed | |
640 | * than OS intended it to run at. Detect it and handle it cleanly. | |
641 | */ | |
642 | static int bios_with_sw_any_bug; | |
643 | ||
1855256c | 644 | static int sw_any_bug_found(const struct dmi_system_id *d) |
8adcc0c6 VP |
645 | { |
646 | bios_with_sw_any_bug = 1; | |
647 | return 0; | |
648 | } | |
649 | ||
1855256c | 650 | static const struct dmi_system_id sw_any_bug_dmi_table[] = { |
8adcc0c6 VP |
651 | { |
652 | .callback = sw_any_bug_found, | |
653 | .ident = "Supermicro Server X6DLP", | |
654 | .matches = { | |
655 | DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"), | |
656 | DMI_MATCH(DMI_BIOS_VERSION, "080010"), | |
657 | DMI_MATCH(DMI_PRODUCT_NAME, "X6DLP"), | |
658 | }, | |
659 | }, | |
660 | { } | |
661 | }; | |
1a8e42fa PB |
662 | |
663 | static int acpi_cpufreq_blacklist(struct cpuinfo_x86 *c) | |
664 | { | |
293afe44 JV |
665 | /* Intel Xeon Processor 7100 Series Specification Update |
666 | * http://www.intel.com/Assets/PDF/specupdate/314554.pdf | |
1a8e42fa PB |
667 | * AL30: A Machine Check Exception (MCE) Occurring during an |
668 | * Enhanced Intel SpeedStep Technology Ratio Change May Cause | |
293afe44 | 669 | * Both Processor Cores to Lock Up. */ |
1a8e42fa PB |
670 | if (c->x86_vendor == X86_VENDOR_INTEL) { |
671 | if ((c->x86 == 15) && | |
672 | (c->x86_model == 6) && | |
293afe44 JV |
673 | (c->x86_mask == 8)) { |
674 | printk(KERN_INFO "acpi-cpufreq: Intel(R) " | |
675 | "Xeon(R) 7100 Errata AL30, processors may " | |
676 | "lock up on frequency changes: disabling " | |
677 | "acpi-cpufreq.\n"); | |
1a8e42fa | 678 | return -ENODEV; |
293afe44 | 679 | } |
1a8e42fa PB |
680 | } |
681 | return 0; | |
682 | } | |
95625b8f | 683 | #endif |
8adcc0c6 | 684 | |
64be7eed | 685 | static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy) |
1da177e4 | 686 | { |
64be7eed VP |
687 | unsigned int i; |
688 | unsigned int valid_states = 0; | |
689 | unsigned int cpu = policy->cpu; | |
690 | struct acpi_cpufreq_data *data; | |
64be7eed | 691 | unsigned int result = 0; |
92cb7612 | 692 | struct cpuinfo_x86 *c = &cpu_data(policy->cpu); |
64be7eed | 693 | struct acpi_processor_performance *perf; |
293afe44 JV |
694 | #ifdef CONFIG_SMP |
695 | static int blacklisted; | |
696 | #endif | |
1da177e4 | 697 | |
2d06d8c4 | 698 | pr_debug("acpi_cpufreq_cpu_init\n"); |
1da177e4 | 699 | |
1a8e42fa | 700 | #ifdef CONFIG_SMP |
293afe44 JV |
701 | if (blacklisted) |
702 | return blacklisted; | |
703 | blacklisted = acpi_cpufreq_blacklist(c); | |
704 | if (blacklisted) | |
705 | return blacklisted; | |
1a8e42fa PB |
706 | #endif |
707 | ||
fe27cb35 | 708 | data = kzalloc(sizeof(struct acpi_cpufreq_data), GFP_KERNEL); |
1da177e4 | 709 | if (!data) |
64be7eed | 710 | return -ENOMEM; |
1da177e4 | 711 | |
b36128c8 | 712 | data->acpi_data = per_cpu_ptr(acpi_perf_data, cpu); |
f1625066 | 713 | per_cpu(acfreq_data, cpu) = data; |
1da177e4 | 714 | |
95dd7227 | 715 | if (cpu_has(c, X86_FEATURE_CONSTANT_TSC)) |
fe27cb35 | 716 | acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS; |
1da177e4 | 717 | |
fe27cb35 | 718 | result = acpi_processor_register_performance(data->acpi_data, cpu); |
1da177e4 LT |
719 | if (result) |
720 | goto err_free; | |
721 | ||
09b4d1ee | 722 | perf = data->acpi_data; |
09b4d1ee | 723 | policy->shared_type = perf->shared_type; |
95dd7227 | 724 | |
46f18e3a | 725 | /* |
95dd7227 | 726 | * Will let policy->cpus know about dependency only when software |
46f18e3a VP |
727 | * coordination is required. |
728 | */ | |
729 | if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL || | |
8adcc0c6 | 730 | policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) { |
835481d9 | 731 | cpumask_copy(policy->cpus, perf->shared_cpu_map); |
8adcc0c6 | 732 | } |
835481d9 | 733 | cpumask_copy(policy->related_cpus, perf->shared_cpu_map); |
8adcc0c6 VP |
734 | |
735 | #ifdef CONFIG_SMP | |
736 | dmi_check_system(sw_any_bug_dmi_table); | |
835481d9 | 737 | if (bios_with_sw_any_bug && cpumask_weight(policy->cpus) == 1) { |
8adcc0c6 | 738 | policy->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
835481d9 | 739 | cpumask_copy(policy->cpus, cpu_core_mask(cpu)); |
8adcc0c6 | 740 | } |
acd31624 AP |
741 | |
742 | if (check_amd_hwpstate_cpu(cpu) && !acpi_pstate_strict) { | |
743 | cpumask_clear(policy->cpus); | |
744 | cpumask_set_cpu(cpu, policy->cpus); | |
745 | cpumask_copy(policy->related_cpus, cpu_sibling_mask(cpu)); | |
746 | policy->shared_type = CPUFREQ_SHARED_TYPE_HW; | |
747 | pr_info_once(PFX "overriding BIOS provided _PSD data\n"); | |
748 | } | |
8adcc0c6 | 749 | #endif |
09b4d1ee | 750 | |
1da177e4 | 751 | /* capability check */ |
09b4d1ee | 752 | if (perf->state_count <= 1) { |
2d06d8c4 | 753 | pr_debug("No P-States\n"); |
1da177e4 LT |
754 | result = -ENODEV; |
755 | goto err_unreg; | |
756 | } | |
09b4d1ee | 757 | |
fe27cb35 VP |
758 | if (perf->control_register.space_id != perf->status_register.space_id) { |
759 | result = -ENODEV; | |
760 | goto err_unreg; | |
761 | } | |
762 | ||
763 | switch (perf->control_register.space_id) { | |
64be7eed | 764 | case ACPI_ADR_SPACE_SYSTEM_IO: |
2d06d8c4 | 765 | pr_debug("SYSTEM IO addr space\n"); |
dde9f7ba VP |
766 | data->cpu_feature = SYSTEM_IO_CAPABLE; |
767 | break; | |
64be7eed | 768 | case ACPI_ADR_SPACE_FIXED_HARDWARE: |
2d06d8c4 | 769 | pr_debug("HARDWARE addr space\n"); |
3dc9a633 MG |
770 | if (check_est_cpu(cpu)) { |
771 | data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE; | |
772 | break; | |
dde9f7ba | 773 | } |
3dc9a633 MG |
774 | if (check_amd_hwpstate_cpu(cpu)) { |
775 | data->cpu_feature = SYSTEM_AMD_MSR_CAPABLE; | |
776 | break; | |
777 | } | |
778 | result = -ENODEV; | |
779 | goto err_unreg; | |
64be7eed | 780 | default: |
2d06d8c4 | 781 | pr_debug("Unknown addr space %d\n", |
64be7eed | 782 | (u32) (perf->control_register.space_id)); |
1da177e4 LT |
783 | result = -ENODEV; |
784 | goto err_unreg; | |
785 | } | |
786 | ||
95dd7227 DJ |
787 | data->freq_table = kmalloc(sizeof(struct cpufreq_frequency_table) * |
788 | (perf->state_count+1), GFP_KERNEL); | |
1da177e4 LT |
789 | if (!data->freq_table) { |
790 | result = -ENOMEM; | |
791 | goto err_unreg; | |
792 | } | |
793 | ||
794 | /* detect transition latency */ | |
795 | policy->cpuinfo.transition_latency = 0; | |
3a58df35 | 796 | for (i = 0; i < perf->state_count; i++) { |
64be7eed VP |
797 | if ((perf->states[i].transition_latency * 1000) > |
798 | policy->cpuinfo.transition_latency) | |
799 | policy->cpuinfo.transition_latency = | |
800 | perf->states[i].transition_latency * 1000; | |
1da177e4 | 801 | } |
1da177e4 | 802 | |
a59d1637 PV |
803 | /* Check for high latency (>20uS) from buggy BIOSes, like on T42 */ |
804 | if (perf->control_register.space_id == ACPI_ADR_SPACE_FIXED_HARDWARE && | |
805 | policy->cpuinfo.transition_latency > 20 * 1000) { | |
a59d1637 | 806 | policy->cpuinfo.transition_latency = 20 * 1000; |
61c8c67e JP |
807 | printk_once(KERN_INFO |
808 | "P-state transition latency capped at 20 uS\n"); | |
a59d1637 PV |
809 | } |
810 | ||
1da177e4 | 811 | /* table init */ |
3a58df35 DJ |
812 | for (i = 0; i < perf->state_count; i++) { |
813 | if (i > 0 && perf->states[i].core_frequency >= | |
3cdf552b | 814 | data->freq_table[valid_states-1].frequency / 1000) |
fe27cb35 VP |
815 | continue; |
816 | ||
817 | data->freq_table[valid_states].index = i; | |
818 | data->freq_table[valid_states].frequency = | |
64be7eed | 819 | perf->states[i].core_frequency * 1000; |
fe27cb35 | 820 | valid_states++; |
1da177e4 | 821 | } |
3d4a7ef3 | 822 | data->freq_table[valid_states].frequency = CPUFREQ_TABLE_END; |
8edc59d9 | 823 | perf->state = 0; |
1da177e4 LT |
824 | |
825 | result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table); | |
95dd7227 | 826 | if (result) |
1da177e4 | 827 | goto err_freqfree; |
1da177e4 | 828 | |
d876dfbb TR |
829 | if (perf->states[0].core_frequency * 1000 != policy->cpuinfo.max_freq) |
830 | printk(KERN_WARNING FW_WARN "P-state 0 is not max freq\n"); | |
831 | ||
a507ac4b | 832 | switch (perf->control_register.space_id) { |
64be7eed | 833 | case ACPI_ADR_SPACE_SYSTEM_IO: |
dde9f7ba VP |
834 | /* Current speed is unknown and not detectable by IO port */ |
835 | policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu); | |
836 | break; | |
64be7eed | 837 | case ACPI_ADR_SPACE_FIXED_HARDWARE: |
7650b281 | 838 | acpi_cpufreq_driver.get = get_cur_freq_on_cpu; |
a507ac4b | 839 | policy->cur = get_cur_freq_on_cpu(cpu); |
dde9f7ba | 840 | break; |
64be7eed | 841 | default: |
dde9f7ba VP |
842 | break; |
843 | } | |
844 | ||
1da177e4 LT |
845 | /* notify BIOS that we exist */ |
846 | acpi_processor_notify_smm(THIS_MODULE); | |
847 | ||
dfde5d62 | 848 | /* Check for APERF/MPERF support in hardware */ |
92e03c41 | 849 | if (boot_cpu_has(X86_FEATURE_APERFMPERF)) |
a2fed573 | 850 | acpi_cpufreq_driver.getavg = cpufreq_get_measured_perf; |
dfde5d62 | 851 | |
2d06d8c4 | 852 | pr_debug("CPU%u - ACPI performance management activated.\n", cpu); |
09b4d1ee | 853 | for (i = 0; i < perf->state_count; i++) |
2d06d8c4 | 854 | pr_debug(" %cP%d: %d MHz, %d mW, %d uS\n", |
64be7eed | 855 | (i == perf->state ? '*' : ' '), i, |
09b4d1ee VP |
856 | (u32) perf->states[i].core_frequency, |
857 | (u32) perf->states[i].power, | |
858 | (u32) perf->states[i].transition_latency); | |
1da177e4 LT |
859 | |
860 | cpufreq_frequency_table_get_attr(data->freq_table, policy->cpu); | |
64be7eed | 861 | |
4b31e774 DB |
862 | /* |
863 | * the first call to ->target() should result in us actually | |
864 | * writing something to the appropriate registers. | |
865 | */ | |
866 | data->resume = 1; | |
64be7eed | 867 | |
fe27cb35 | 868 | return result; |
1da177e4 | 869 | |
95dd7227 | 870 | err_freqfree: |
1da177e4 | 871 | kfree(data->freq_table); |
95dd7227 | 872 | err_unreg: |
09b4d1ee | 873 | acpi_processor_unregister_performance(perf, cpu); |
95dd7227 | 874 | err_free: |
1da177e4 | 875 | kfree(data); |
f1625066 | 876 | per_cpu(acfreq_data, cpu) = NULL; |
1da177e4 | 877 | |
64be7eed | 878 | return result; |
1da177e4 LT |
879 | } |
880 | ||
64be7eed | 881 | static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy) |
1da177e4 | 882 | { |
f1625066 | 883 | struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu); |
1da177e4 | 884 | |
2d06d8c4 | 885 | pr_debug("acpi_cpufreq_cpu_exit\n"); |
1da177e4 LT |
886 | |
887 | if (data) { | |
888 | cpufreq_frequency_table_put_attr(policy->cpu); | |
f1625066 | 889 | per_cpu(acfreq_data, policy->cpu) = NULL; |
64be7eed VP |
890 | acpi_processor_unregister_performance(data->acpi_data, |
891 | policy->cpu); | |
dab5fff1 | 892 | kfree(data->freq_table); |
1da177e4 LT |
893 | kfree(data); |
894 | } | |
895 | ||
64be7eed | 896 | return 0; |
1da177e4 LT |
897 | } |
898 | ||
64be7eed | 899 | static int acpi_cpufreq_resume(struct cpufreq_policy *policy) |
1da177e4 | 900 | { |
f1625066 | 901 | struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu); |
1da177e4 | 902 | |
2d06d8c4 | 903 | pr_debug("acpi_cpufreq_resume\n"); |
1da177e4 LT |
904 | |
905 | data->resume = 1; | |
906 | ||
64be7eed | 907 | return 0; |
1da177e4 LT |
908 | } |
909 | ||
64be7eed | 910 | static struct freq_attr *acpi_cpufreq_attr[] = { |
1da177e4 | 911 | &cpufreq_freq_attr_scaling_available_freqs, |
11269ff5 | 912 | NULL, /* this is a placeholder for cpb, do not remove */ |
1da177e4 LT |
913 | NULL, |
914 | }; | |
915 | ||
916 | static struct cpufreq_driver acpi_cpufreq_driver = { | |
e2f74f35 TR |
917 | .verify = acpi_cpufreq_verify, |
918 | .target = acpi_cpufreq_target, | |
919 | .bios_limit = acpi_processor_get_bios_limit, | |
920 | .init = acpi_cpufreq_cpu_init, | |
921 | .exit = acpi_cpufreq_cpu_exit, | |
922 | .resume = acpi_cpufreq_resume, | |
923 | .name = "acpi-cpufreq", | |
924 | .owner = THIS_MODULE, | |
925 | .attr = acpi_cpufreq_attr, | |
1da177e4 LT |
926 | }; |
927 | ||
615b7300 AP |
928 | static void __init acpi_cpufreq_boost_init(void) |
929 | { | |
930 | if (boot_cpu_has(X86_FEATURE_CPB) || boot_cpu_has(X86_FEATURE_IDA)) { | |
931 | msrs = msrs_alloc(); | |
932 | ||
933 | if (!msrs) | |
934 | return; | |
935 | ||
936 | boost_supported = true; | |
937 | boost_enabled = boost_state(0); | |
938 | ||
939 | get_online_cpus(); | |
940 | ||
941 | /* Force all MSRs to the same value */ | |
942 | boost_set_msrs(boost_enabled, cpu_online_mask); | |
943 | ||
944 | register_cpu_notifier(&boost_nb); | |
945 | ||
946 | put_online_cpus(); | |
947 | } else | |
948 | global_boost.attr.mode = 0444; | |
949 | ||
950 | /* We create the boost file in any case, though for systems without | |
951 | * hardware support it will be read-only and hardwired to return 0. | |
952 | */ | |
953 | if (sysfs_create_file(cpufreq_global_kobject, &(global_boost.attr))) | |
954 | pr_warn(PFX "could not register global boost sysfs file\n"); | |
955 | else | |
956 | pr_debug("registered global boost sysfs file\n"); | |
957 | } | |
958 | ||
959 | static void __exit acpi_cpufreq_boost_exit(void) | |
960 | { | |
961 | sysfs_remove_file(cpufreq_global_kobject, &(global_boost.attr)); | |
962 | ||
963 | if (msrs) { | |
964 | unregister_cpu_notifier(&boost_nb); | |
965 | ||
966 | msrs_free(msrs); | |
967 | msrs = NULL; | |
968 | } | |
969 | } | |
970 | ||
64be7eed | 971 | static int __init acpi_cpufreq_init(void) |
1da177e4 | 972 | { |
50109292 FY |
973 | int ret; |
974 | ||
ee297533 YL |
975 | if (acpi_disabled) |
976 | return 0; | |
977 | ||
2d06d8c4 | 978 | pr_debug("acpi_cpufreq_init\n"); |
1da177e4 | 979 | |
50109292 FY |
980 | ret = acpi_cpufreq_early_init(); |
981 | if (ret) | |
982 | return ret; | |
09b4d1ee | 983 | |
11269ff5 AP |
984 | #ifdef CONFIG_X86_ACPI_CPUFREQ_CPB |
985 | /* this is a sysfs file with a strange name and an even stranger | |
986 | * semantic - per CPU instantiation, but system global effect. | |
987 | * Lets enable it only on AMD CPUs for compatibility reasons and | |
988 | * only if configured. This is considered legacy code, which | |
989 | * will probably be removed at some point in the future. | |
990 | */ | |
991 | if (check_amd_hwpstate_cpu(0)) { | |
992 | struct freq_attr **iter; | |
993 | ||
994 | pr_debug("adding sysfs entry for cpb\n"); | |
995 | ||
996 | for (iter = acpi_cpufreq_attr; *iter != NULL; iter++) | |
997 | ; | |
998 | ||
999 | /* make sure there is a terminator behind it */ | |
1000 | if (iter[1] == NULL) | |
1001 | *iter = &cpb; | |
1002 | } | |
1003 | #endif | |
1004 | ||
847aef6f AM |
1005 | ret = cpufreq_register_driver(&acpi_cpufreq_driver); |
1006 | if (ret) | |
2fdf66b4 | 1007 | free_acpi_perf_data(); |
615b7300 AP |
1008 | else |
1009 | acpi_cpufreq_boost_init(); | |
847aef6f AM |
1010 | |
1011 | return ret; | |
1da177e4 LT |
1012 | } |
1013 | ||
64be7eed | 1014 | static void __exit acpi_cpufreq_exit(void) |
1da177e4 | 1015 | { |
2d06d8c4 | 1016 | pr_debug("acpi_cpufreq_exit\n"); |
1da177e4 | 1017 | |
615b7300 AP |
1018 | acpi_cpufreq_boost_exit(); |
1019 | ||
1da177e4 LT |
1020 | cpufreq_unregister_driver(&acpi_cpufreq_driver); |
1021 | ||
50f4ddd4 | 1022 | free_acpi_perf_data(); |
1da177e4 LT |
1023 | } |
1024 | ||
d395bf12 | 1025 | module_param(acpi_pstate_strict, uint, 0644); |
64be7eed | 1026 | MODULE_PARM_DESC(acpi_pstate_strict, |
95dd7227 DJ |
1027 | "value 0 or non-zero. non-zero -> strict ACPI checks are " |
1028 | "performed during frequency changes."); | |
1da177e4 LT |
1029 | |
1030 | late_initcall(acpi_cpufreq_init); | |
1031 | module_exit(acpi_cpufreq_exit); | |
1032 | ||
1033 | MODULE_ALIAS("acpi"); |