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> | |
fe27cb35 | 48 | |
1da177e4 LT |
49 | MODULE_AUTHOR("Paul Diefenbaugh, Dominik Brodowski"); |
50 | MODULE_DESCRIPTION("ACPI Processor P-States Driver"); | |
51 | MODULE_LICENSE("GPL"); | |
52 | ||
acd31624 AP |
53 | #define PFX "acpi-cpufreq: " |
54 | ||
dde9f7ba VP |
55 | enum { |
56 | UNDEFINED_CAPABLE = 0, | |
57 | SYSTEM_INTEL_MSR_CAPABLE, | |
3dc9a633 | 58 | SYSTEM_AMD_MSR_CAPABLE, |
dde9f7ba VP |
59 | SYSTEM_IO_CAPABLE, |
60 | }; | |
61 | ||
62 | #define INTEL_MSR_RANGE (0xffff) | |
3dc9a633 | 63 | #define AMD_MSR_RANGE (0x7) |
dde9f7ba | 64 | |
615b7300 AP |
65 | #define MSR_K7_HWCR_CPB_DIS (1ULL << 25) |
66 | ||
fe27cb35 | 67 | struct acpi_cpufreq_data { |
64be7eed VP |
68 | struct acpi_processor_performance *acpi_data; |
69 | struct cpufreq_frequency_table *freq_table; | |
70 | unsigned int resume; | |
71 | unsigned int cpu_feature; | |
f4fd3797 | 72 | cpumask_var_t freqdomain_cpus; |
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 struct msr __percpu *msrs; |
84 | ||
85 | static bool boost_state(unsigned int cpu) | |
86 | { | |
87 | u32 lo, hi; | |
88 | u64 msr; | |
89 | ||
90 | switch (boot_cpu_data.x86_vendor) { | |
91 | case X86_VENDOR_INTEL: | |
92 | rdmsr_on_cpu(cpu, MSR_IA32_MISC_ENABLE, &lo, &hi); | |
93 | msr = lo | ((u64)hi << 32); | |
94 | return !(msr & MSR_IA32_MISC_ENABLE_TURBO_DISABLE); | |
95 | case X86_VENDOR_AMD: | |
96 | rdmsr_on_cpu(cpu, MSR_K7_HWCR, &lo, &hi); | |
97 | msr = lo | ((u64)hi << 32); | |
98 | return !(msr & MSR_K7_HWCR_CPB_DIS); | |
99 | } | |
100 | return false; | |
101 | } | |
102 | ||
103 | static void boost_set_msrs(bool enable, const struct cpumask *cpumask) | |
104 | { | |
105 | u32 cpu; | |
106 | u32 msr_addr; | |
107 | u64 msr_mask; | |
108 | ||
109 | switch (boot_cpu_data.x86_vendor) { | |
110 | case X86_VENDOR_INTEL: | |
111 | msr_addr = MSR_IA32_MISC_ENABLE; | |
112 | msr_mask = MSR_IA32_MISC_ENABLE_TURBO_DISABLE; | |
113 | break; | |
114 | case X86_VENDOR_AMD: | |
115 | msr_addr = MSR_K7_HWCR; | |
116 | msr_mask = MSR_K7_HWCR_CPB_DIS; | |
117 | break; | |
118 | default: | |
119 | return; | |
120 | } | |
121 | ||
122 | rdmsr_on_cpus(cpumask, msr_addr, msrs); | |
123 | ||
124 | for_each_cpu(cpu, cpumask) { | |
125 | struct msr *reg = per_cpu_ptr(msrs, cpu); | |
126 | if (enable) | |
127 | reg->q &= ~msr_mask; | |
128 | else | |
129 | reg->q |= msr_mask; | |
130 | } | |
131 | ||
132 | wrmsr_on_cpus(cpumask, msr_addr, msrs); | |
133 | } | |
134 | ||
cfc9c8ed | 135 | static int _store_boost(int val) |
615b7300 | 136 | { |
615b7300 | 137 | get_online_cpus(); |
615b7300 | 138 | boost_set_msrs(val, cpu_online_mask); |
615b7300 | 139 | put_online_cpus(); |
615b7300 AP |
140 | pr_debug("Core Boosting %sabled.\n", val ? "en" : "dis"); |
141 | ||
cfc9c8ed | 142 | return 0; |
615b7300 AP |
143 | } |
144 | ||
f4fd3797 LT |
145 | static ssize_t show_freqdomain_cpus(struct cpufreq_policy *policy, char *buf) |
146 | { | |
147 | struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu); | |
148 | ||
149 | return cpufreq_show_cpus(data->freqdomain_cpus, buf); | |
150 | } | |
151 | ||
152 | cpufreq_freq_attr_ro(freqdomain_cpus); | |
153 | ||
11269ff5 | 154 | #ifdef CONFIG_X86_ACPI_CPUFREQ_CPB |
cfc9c8ed LM |
155 | static ssize_t store_boost(const char *buf, size_t count) |
156 | { | |
157 | int ret; | |
158 | unsigned long val = 0; | |
159 | ||
160 | if (!acpi_cpufreq_driver.boost_supported) | |
161 | return -EINVAL; | |
162 | ||
163 | ret = kstrtoul(buf, 10, &val); | |
164 | if (ret || (val > 1)) | |
165 | return -EINVAL; | |
166 | ||
167 | _store_boost((int) val); | |
168 | ||
169 | return count; | |
170 | } | |
171 | ||
11269ff5 AP |
172 | static ssize_t store_cpb(struct cpufreq_policy *policy, const char *buf, |
173 | size_t count) | |
174 | { | |
cfc9c8ed | 175 | return store_boost(buf, count); |
11269ff5 AP |
176 | } |
177 | ||
178 | static ssize_t show_cpb(struct cpufreq_policy *policy, char *buf) | |
179 | { | |
cfc9c8ed | 180 | return sprintf(buf, "%u\n", acpi_cpufreq_driver.boost_enabled); |
11269ff5 AP |
181 | } |
182 | ||
59027d35 | 183 | cpufreq_freq_attr_rw(cpb); |
11269ff5 AP |
184 | #endif |
185 | ||
dde9f7ba VP |
186 | static int check_est_cpu(unsigned int cpuid) |
187 | { | |
92cb7612 | 188 | struct cpuinfo_x86 *cpu = &cpu_data(cpuid); |
dde9f7ba | 189 | |
0de51088 | 190 | return cpu_has(cpu, X86_FEATURE_EST); |
dde9f7ba VP |
191 | } |
192 | ||
3dc9a633 MG |
193 | static int check_amd_hwpstate_cpu(unsigned int cpuid) |
194 | { | |
195 | struct cpuinfo_x86 *cpu = &cpu_data(cpuid); | |
196 | ||
197 | return cpu_has(cpu, X86_FEATURE_HW_PSTATE); | |
198 | } | |
199 | ||
dde9f7ba | 200 | static unsigned extract_io(u32 value, struct acpi_cpufreq_data *data) |
fe27cb35 | 201 | { |
64be7eed VP |
202 | struct acpi_processor_performance *perf; |
203 | int i; | |
fe27cb35 VP |
204 | |
205 | perf = data->acpi_data; | |
206 | ||
3a58df35 | 207 | for (i = 0; i < perf->state_count; i++) { |
fe27cb35 VP |
208 | if (value == perf->states[i].status) |
209 | return data->freq_table[i].frequency; | |
210 | } | |
211 | return 0; | |
212 | } | |
213 | ||
dde9f7ba VP |
214 | static unsigned extract_msr(u32 msr, struct acpi_cpufreq_data *data) |
215 | { | |
041526f9 | 216 | struct cpufreq_frequency_table *pos; |
a6f6e6e6 | 217 | struct acpi_processor_performance *perf; |
dde9f7ba | 218 | |
3dc9a633 MG |
219 | if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) |
220 | msr &= AMD_MSR_RANGE; | |
221 | else | |
222 | msr &= INTEL_MSR_RANGE; | |
223 | ||
a6f6e6e6 VP |
224 | perf = data->acpi_data; |
225 | ||
041526f9 SK |
226 | cpufreq_for_each_entry(pos, data->freq_table) |
227 | if (msr == perf->states[pos->driver_data].status) | |
228 | return pos->frequency; | |
dde9f7ba VP |
229 | return data->freq_table[0].frequency; |
230 | } | |
231 | ||
dde9f7ba VP |
232 | static unsigned extract_freq(u32 val, struct acpi_cpufreq_data *data) |
233 | { | |
234 | switch (data->cpu_feature) { | |
64be7eed | 235 | case SYSTEM_INTEL_MSR_CAPABLE: |
3dc9a633 | 236 | case SYSTEM_AMD_MSR_CAPABLE: |
dde9f7ba | 237 | return extract_msr(val, data); |
64be7eed | 238 | case SYSTEM_IO_CAPABLE: |
dde9f7ba | 239 | return extract_io(val, data); |
64be7eed | 240 | default: |
dde9f7ba VP |
241 | return 0; |
242 | } | |
243 | } | |
244 | ||
dde9f7ba VP |
245 | struct msr_addr { |
246 | u32 reg; | |
247 | }; | |
248 | ||
fe27cb35 VP |
249 | struct io_addr { |
250 | u16 port; | |
251 | u8 bit_width; | |
252 | }; | |
253 | ||
254 | struct drv_cmd { | |
dde9f7ba | 255 | unsigned int type; |
bfa318ad | 256 | const struct cpumask *mask; |
3a58df35 DJ |
257 | union { |
258 | struct msr_addr msr; | |
259 | struct io_addr io; | |
260 | } addr; | |
fe27cb35 VP |
261 | u32 val; |
262 | }; | |
263 | ||
01599fca AM |
264 | /* Called via smp_call_function_single(), on the target CPU */ |
265 | static void do_drv_read(void *_cmd) | |
1da177e4 | 266 | { |
72859081 | 267 | struct drv_cmd *cmd = _cmd; |
dde9f7ba VP |
268 | u32 h; |
269 | ||
270 | switch (cmd->type) { | |
64be7eed | 271 | case SYSTEM_INTEL_MSR_CAPABLE: |
3dc9a633 | 272 | case SYSTEM_AMD_MSR_CAPABLE: |
dde9f7ba VP |
273 | rdmsr(cmd->addr.msr.reg, cmd->val, h); |
274 | break; | |
64be7eed | 275 | case SYSTEM_IO_CAPABLE: |
4e581ff1 VP |
276 | acpi_os_read_port((acpi_io_address)cmd->addr.io.port, |
277 | &cmd->val, | |
278 | (u32)cmd->addr.io.bit_width); | |
dde9f7ba | 279 | break; |
64be7eed | 280 | default: |
dde9f7ba VP |
281 | break; |
282 | } | |
fe27cb35 | 283 | } |
1da177e4 | 284 | |
01599fca AM |
285 | /* Called via smp_call_function_many(), on the target CPUs */ |
286 | static void do_drv_write(void *_cmd) | |
fe27cb35 | 287 | { |
72859081 | 288 | struct drv_cmd *cmd = _cmd; |
13424f65 | 289 | u32 lo, hi; |
dde9f7ba VP |
290 | |
291 | switch (cmd->type) { | |
64be7eed | 292 | case SYSTEM_INTEL_MSR_CAPABLE: |
13424f65 VP |
293 | rdmsr(cmd->addr.msr.reg, lo, hi); |
294 | lo = (lo & ~INTEL_MSR_RANGE) | (cmd->val & INTEL_MSR_RANGE); | |
295 | wrmsr(cmd->addr.msr.reg, lo, hi); | |
dde9f7ba | 296 | break; |
3dc9a633 MG |
297 | case SYSTEM_AMD_MSR_CAPABLE: |
298 | wrmsr(cmd->addr.msr.reg, cmd->val, 0); | |
299 | break; | |
64be7eed | 300 | case SYSTEM_IO_CAPABLE: |
4e581ff1 VP |
301 | acpi_os_write_port((acpi_io_address)cmd->addr.io.port, |
302 | cmd->val, | |
303 | (u32)cmd->addr.io.bit_width); | |
dde9f7ba | 304 | break; |
64be7eed | 305 | default: |
dde9f7ba VP |
306 | break; |
307 | } | |
fe27cb35 | 308 | } |
1da177e4 | 309 | |
95dd7227 | 310 | static void drv_read(struct drv_cmd *cmd) |
fe27cb35 | 311 | { |
4a28395d | 312 | int err; |
fe27cb35 VP |
313 | cmd->val = 0; |
314 | ||
4a28395d AM |
315 | err = smp_call_function_any(cmd->mask, do_drv_read, cmd, 1); |
316 | WARN_ON_ONCE(err); /* smp_call_function_any() was buggy? */ | |
fe27cb35 VP |
317 | } |
318 | ||
319 | static void drv_write(struct drv_cmd *cmd) | |
320 | { | |
ea34f43a LT |
321 | int this_cpu; |
322 | ||
323 | this_cpu = get_cpu(); | |
324 | if (cpumask_test_cpu(this_cpu, cmd->mask)) | |
325 | do_drv_write(cmd); | |
01599fca | 326 | smp_call_function_many(cmd->mask, do_drv_write, cmd, 1); |
ea34f43a | 327 | put_cpu(); |
fe27cb35 | 328 | } |
1da177e4 | 329 | |
4d8bb537 | 330 | static u32 get_cur_val(const struct cpumask *mask) |
fe27cb35 | 331 | { |
64be7eed VP |
332 | struct acpi_processor_performance *perf; |
333 | struct drv_cmd cmd; | |
1da177e4 | 334 | |
4d8bb537 | 335 | if (unlikely(cpumask_empty(mask))) |
fe27cb35 | 336 | return 0; |
1da177e4 | 337 | |
f1625066 | 338 | switch (per_cpu(acfreq_data, cpumask_first(mask))->cpu_feature) { |
dde9f7ba VP |
339 | case SYSTEM_INTEL_MSR_CAPABLE: |
340 | cmd.type = SYSTEM_INTEL_MSR_CAPABLE; | |
8673b83b | 341 | cmd.addr.msr.reg = MSR_IA32_PERF_CTL; |
dde9f7ba | 342 | break; |
3dc9a633 MG |
343 | case SYSTEM_AMD_MSR_CAPABLE: |
344 | cmd.type = SYSTEM_AMD_MSR_CAPABLE; | |
8673b83b | 345 | cmd.addr.msr.reg = MSR_AMD_PERF_CTL; |
3dc9a633 | 346 | break; |
dde9f7ba VP |
347 | case SYSTEM_IO_CAPABLE: |
348 | cmd.type = SYSTEM_IO_CAPABLE; | |
f1625066 | 349 | perf = per_cpu(acfreq_data, cpumask_first(mask))->acpi_data; |
dde9f7ba VP |
350 | cmd.addr.io.port = perf->control_register.address; |
351 | cmd.addr.io.bit_width = perf->control_register.bit_width; | |
352 | break; | |
353 | default: | |
354 | return 0; | |
355 | } | |
356 | ||
bfa318ad | 357 | cmd.mask = mask; |
fe27cb35 | 358 | drv_read(&cmd); |
1da177e4 | 359 | |
2d06d8c4 | 360 | pr_debug("get_cur_val = %u\n", cmd.val); |
fe27cb35 VP |
361 | |
362 | return cmd.val; | |
363 | } | |
1da177e4 | 364 | |
fe27cb35 VP |
365 | static unsigned int get_cur_freq_on_cpu(unsigned int cpu) |
366 | { | |
f1625066 | 367 | struct acpi_cpufreq_data *data = per_cpu(acfreq_data, cpu); |
64be7eed | 368 | unsigned int freq; |
e56a727b | 369 | unsigned int cached_freq; |
fe27cb35 | 370 | |
2d06d8c4 | 371 | pr_debug("get_cur_freq_on_cpu (%d)\n", cpu); |
fe27cb35 VP |
372 | |
373 | if (unlikely(data == NULL || | |
64be7eed | 374 | data->acpi_data == NULL || data->freq_table == NULL)) { |
fe27cb35 | 375 | return 0; |
1da177e4 LT |
376 | } |
377 | ||
e56a727b | 378 | cached_freq = data->freq_table[data->acpi_data->state].frequency; |
e39ad415 | 379 | freq = extract_freq(get_cur_val(cpumask_of(cpu)), data); |
e56a727b VP |
380 | if (freq != cached_freq) { |
381 | /* | |
382 | * The dreaded BIOS frequency change behind our back. | |
383 | * Force set the frequency on next target call. | |
384 | */ | |
385 | data->resume = 1; | |
386 | } | |
387 | ||
2d06d8c4 | 388 | pr_debug("cur freq = %u\n", freq); |
1da177e4 | 389 | |
fe27cb35 | 390 | return freq; |
1da177e4 LT |
391 | } |
392 | ||
72859081 | 393 | static unsigned int check_freqs(const struct cpumask *mask, unsigned int freq, |
64be7eed | 394 | struct acpi_cpufreq_data *data) |
fe27cb35 | 395 | { |
64be7eed VP |
396 | unsigned int cur_freq; |
397 | unsigned int i; | |
1da177e4 | 398 | |
3a58df35 | 399 | for (i = 0; i < 100; i++) { |
fe27cb35 VP |
400 | cur_freq = extract_freq(get_cur_val(mask), data); |
401 | if (cur_freq == freq) | |
402 | return 1; | |
403 | udelay(10); | |
404 | } | |
405 | return 0; | |
406 | } | |
407 | ||
408 | static int acpi_cpufreq_target(struct cpufreq_policy *policy, | |
9c0ebcf7 | 409 | unsigned int index) |
1da177e4 | 410 | { |
f1625066 | 411 | struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu); |
64be7eed | 412 | struct acpi_processor_performance *perf; |
64be7eed | 413 | struct drv_cmd cmd; |
8edc59d9 | 414 | unsigned int next_perf_state = 0; /* Index into perf table */ |
64be7eed | 415 | int result = 0; |
fe27cb35 | 416 | |
fe27cb35 | 417 | if (unlikely(data == NULL || |
95dd7227 | 418 | data->acpi_data == NULL || data->freq_table == NULL)) { |
fe27cb35 VP |
419 | return -ENODEV; |
420 | } | |
1da177e4 | 421 | |
fe27cb35 | 422 | perf = data->acpi_data; |
9c0ebcf7 | 423 | next_perf_state = data->freq_table[index].driver_data; |
7650b281 | 424 | if (perf->state == next_perf_state) { |
fe27cb35 | 425 | if (unlikely(data->resume)) { |
2d06d8c4 | 426 | pr_debug("Called after resume, resetting to P%d\n", |
64be7eed | 427 | next_perf_state); |
fe27cb35 VP |
428 | data->resume = 0; |
429 | } else { | |
2d06d8c4 | 430 | pr_debug("Already at target state (P%d)\n", |
64be7eed | 431 | next_perf_state); |
4d8bb537 | 432 | goto out; |
fe27cb35 | 433 | } |
09b4d1ee VP |
434 | } |
435 | ||
64be7eed VP |
436 | switch (data->cpu_feature) { |
437 | case SYSTEM_INTEL_MSR_CAPABLE: | |
438 | cmd.type = SYSTEM_INTEL_MSR_CAPABLE; | |
439 | cmd.addr.msr.reg = MSR_IA32_PERF_CTL; | |
13424f65 | 440 | cmd.val = (u32) perf->states[next_perf_state].control; |
64be7eed | 441 | break; |
3dc9a633 MG |
442 | case SYSTEM_AMD_MSR_CAPABLE: |
443 | cmd.type = SYSTEM_AMD_MSR_CAPABLE; | |
444 | cmd.addr.msr.reg = MSR_AMD_PERF_CTL; | |
445 | cmd.val = (u32) perf->states[next_perf_state].control; | |
446 | break; | |
64be7eed VP |
447 | case SYSTEM_IO_CAPABLE: |
448 | cmd.type = SYSTEM_IO_CAPABLE; | |
449 | cmd.addr.io.port = perf->control_register.address; | |
450 | cmd.addr.io.bit_width = perf->control_register.bit_width; | |
451 | cmd.val = (u32) perf->states[next_perf_state].control; | |
452 | break; | |
453 | default: | |
4d8bb537 MT |
454 | result = -ENODEV; |
455 | goto out; | |
64be7eed | 456 | } |
09b4d1ee | 457 | |
4d8bb537 | 458 | /* cpufreq holds the hotplug lock, so we are safe from here on */ |
fe27cb35 | 459 | if (policy->shared_type != CPUFREQ_SHARED_TYPE_ANY) |
bfa318ad | 460 | cmd.mask = policy->cpus; |
fe27cb35 | 461 | else |
bfa318ad | 462 | cmd.mask = cpumask_of(policy->cpu); |
09b4d1ee | 463 | |
fe27cb35 | 464 | drv_write(&cmd); |
09b4d1ee | 465 | |
fe27cb35 | 466 | if (acpi_pstate_strict) { |
d4019f0a VK |
467 | if (!check_freqs(cmd.mask, data->freq_table[index].frequency, |
468 | data)) { | |
2d06d8c4 | 469 | pr_debug("acpi_cpufreq_target failed (%d)\n", |
64be7eed | 470 | policy->cpu); |
4d8bb537 | 471 | result = -EAGAIN; |
09b4d1ee VP |
472 | } |
473 | } | |
474 | ||
e15d8309 VK |
475 | if (!result) |
476 | perf->state = next_perf_state; | |
fe27cb35 | 477 | |
4d8bb537 | 478 | out: |
fe27cb35 | 479 | return result; |
1da177e4 LT |
480 | } |
481 | ||
1da177e4 | 482 | static unsigned long |
64be7eed | 483 | acpi_cpufreq_guess_freq(struct acpi_cpufreq_data *data, unsigned int cpu) |
1da177e4 | 484 | { |
64be7eed | 485 | struct acpi_processor_performance *perf = data->acpi_data; |
09b4d1ee | 486 | |
1da177e4 LT |
487 | if (cpu_khz) { |
488 | /* search the closest match to cpu_khz */ | |
489 | unsigned int i; | |
490 | unsigned long freq; | |
09b4d1ee | 491 | unsigned long freqn = perf->states[0].core_frequency * 1000; |
1da177e4 | 492 | |
3a58df35 | 493 | for (i = 0; i < (perf->state_count-1); i++) { |
1da177e4 | 494 | freq = freqn; |
95dd7227 | 495 | freqn = perf->states[i+1].core_frequency * 1000; |
1da177e4 | 496 | if ((2 * cpu_khz) > (freqn + freq)) { |
09b4d1ee | 497 | perf->state = i; |
64be7eed | 498 | return freq; |
1da177e4 LT |
499 | } |
500 | } | |
95dd7227 | 501 | perf->state = perf->state_count-1; |
64be7eed | 502 | return freqn; |
09b4d1ee | 503 | } else { |
1da177e4 | 504 | /* assume CPU is at P0... */ |
09b4d1ee VP |
505 | perf->state = 0; |
506 | return perf->states[0].core_frequency * 1000; | |
507 | } | |
1da177e4 LT |
508 | } |
509 | ||
2fdf66b4 RR |
510 | static void free_acpi_perf_data(void) |
511 | { | |
512 | unsigned int i; | |
513 | ||
514 | /* Freeing a NULL pointer is OK, and alloc_percpu zeroes. */ | |
515 | for_each_possible_cpu(i) | |
516 | free_cpumask_var(per_cpu_ptr(acpi_perf_data, i) | |
517 | ->shared_cpu_map); | |
518 | free_percpu(acpi_perf_data); | |
519 | } | |
520 | ||
615b7300 AP |
521 | static int boost_notify(struct notifier_block *nb, unsigned long action, |
522 | void *hcpu) | |
523 | { | |
524 | unsigned cpu = (long)hcpu; | |
525 | const struct cpumask *cpumask; | |
526 | ||
527 | cpumask = get_cpu_mask(cpu); | |
528 | ||
529 | /* | |
530 | * Clear the boost-disable bit on the CPU_DOWN path so that | |
531 | * this cpu cannot block the remaining ones from boosting. On | |
532 | * the CPU_UP path we simply keep the boost-disable flag in | |
533 | * sync with the current global state. | |
534 | */ | |
535 | ||
536 | switch (action) { | |
537 | case CPU_UP_PREPARE: | |
538 | case CPU_UP_PREPARE_FROZEN: | |
cfc9c8ed | 539 | boost_set_msrs(acpi_cpufreq_driver.boost_enabled, cpumask); |
615b7300 AP |
540 | break; |
541 | ||
542 | case CPU_DOWN_PREPARE: | |
543 | case CPU_DOWN_PREPARE_FROZEN: | |
544 | boost_set_msrs(1, cpumask); | |
545 | break; | |
546 | ||
547 | default: | |
548 | break; | |
549 | } | |
550 | ||
551 | return NOTIFY_OK; | |
552 | } | |
553 | ||
554 | ||
555 | static struct notifier_block boost_nb = { | |
556 | .notifier_call = boost_notify, | |
557 | }; | |
558 | ||
09b4d1ee VP |
559 | /* |
560 | * acpi_cpufreq_early_init - initialize ACPI P-States library | |
561 | * | |
562 | * Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c) | |
563 | * in order to determine correct frequency and voltage pairings. We can | |
564 | * do _PDC and _PSD and find out the processor dependency for the | |
565 | * actual init that will happen later... | |
566 | */ | |
50109292 | 567 | static int __init acpi_cpufreq_early_init(void) |
09b4d1ee | 568 | { |
2fdf66b4 | 569 | unsigned int i; |
2d06d8c4 | 570 | pr_debug("acpi_cpufreq_early_init\n"); |
09b4d1ee | 571 | |
50109292 FY |
572 | acpi_perf_data = alloc_percpu(struct acpi_processor_performance); |
573 | if (!acpi_perf_data) { | |
2d06d8c4 | 574 | pr_debug("Memory allocation error for acpi_perf_data.\n"); |
50109292 | 575 | return -ENOMEM; |
09b4d1ee | 576 | } |
2fdf66b4 | 577 | for_each_possible_cpu(i) { |
eaa95840 | 578 | if (!zalloc_cpumask_var_node( |
80855f73 MT |
579 | &per_cpu_ptr(acpi_perf_data, i)->shared_cpu_map, |
580 | GFP_KERNEL, cpu_to_node(i))) { | |
2fdf66b4 RR |
581 | |
582 | /* Freeing a NULL pointer is OK: alloc_percpu zeroes. */ | |
583 | free_acpi_perf_data(); | |
584 | return -ENOMEM; | |
585 | } | |
586 | } | |
09b4d1ee VP |
587 | |
588 | /* Do initialization in ACPI core */ | |
fe27cb35 VP |
589 | acpi_processor_preregister_performance(acpi_perf_data); |
590 | return 0; | |
09b4d1ee VP |
591 | } |
592 | ||
95625b8f | 593 | #ifdef CONFIG_SMP |
8adcc0c6 VP |
594 | /* |
595 | * Some BIOSes do SW_ANY coordination internally, either set it up in hw | |
596 | * or do it in BIOS firmware and won't inform about it to OS. If not | |
597 | * detected, this has a side effect of making CPU run at a different speed | |
598 | * than OS intended it to run at. Detect it and handle it cleanly. | |
599 | */ | |
600 | static int bios_with_sw_any_bug; | |
601 | ||
1855256c | 602 | static int sw_any_bug_found(const struct dmi_system_id *d) |
8adcc0c6 VP |
603 | { |
604 | bios_with_sw_any_bug = 1; | |
605 | return 0; | |
606 | } | |
607 | ||
1855256c | 608 | static const struct dmi_system_id sw_any_bug_dmi_table[] = { |
8adcc0c6 VP |
609 | { |
610 | .callback = sw_any_bug_found, | |
611 | .ident = "Supermicro Server X6DLP", | |
612 | .matches = { | |
613 | DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"), | |
614 | DMI_MATCH(DMI_BIOS_VERSION, "080010"), | |
615 | DMI_MATCH(DMI_PRODUCT_NAME, "X6DLP"), | |
616 | }, | |
617 | }, | |
618 | { } | |
619 | }; | |
1a8e42fa PB |
620 | |
621 | static int acpi_cpufreq_blacklist(struct cpuinfo_x86 *c) | |
622 | { | |
293afe44 JV |
623 | /* Intel Xeon Processor 7100 Series Specification Update |
624 | * http://www.intel.com/Assets/PDF/specupdate/314554.pdf | |
1a8e42fa PB |
625 | * AL30: A Machine Check Exception (MCE) Occurring during an |
626 | * Enhanced Intel SpeedStep Technology Ratio Change May Cause | |
293afe44 | 627 | * Both Processor Cores to Lock Up. */ |
1a8e42fa PB |
628 | if (c->x86_vendor == X86_VENDOR_INTEL) { |
629 | if ((c->x86 == 15) && | |
630 | (c->x86_model == 6) && | |
293afe44 JV |
631 | (c->x86_mask == 8)) { |
632 | printk(KERN_INFO "acpi-cpufreq: Intel(R) " | |
633 | "Xeon(R) 7100 Errata AL30, processors may " | |
634 | "lock up on frequency changes: disabling " | |
635 | "acpi-cpufreq.\n"); | |
1a8e42fa | 636 | return -ENODEV; |
293afe44 | 637 | } |
1a8e42fa PB |
638 | } |
639 | return 0; | |
640 | } | |
95625b8f | 641 | #endif |
8adcc0c6 | 642 | |
64be7eed | 643 | static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy) |
1da177e4 | 644 | { |
64be7eed VP |
645 | unsigned int i; |
646 | unsigned int valid_states = 0; | |
647 | unsigned int cpu = policy->cpu; | |
648 | struct acpi_cpufreq_data *data; | |
64be7eed | 649 | unsigned int result = 0; |
92cb7612 | 650 | struct cpuinfo_x86 *c = &cpu_data(policy->cpu); |
64be7eed | 651 | struct acpi_processor_performance *perf; |
293afe44 JV |
652 | #ifdef CONFIG_SMP |
653 | static int blacklisted; | |
654 | #endif | |
1da177e4 | 655 | |
2d06d8c4 | 656 | pr_debug("acpi_cpufreq_cpu_init\n"); |
1da177e4 | 657 | |
1a8e42fa | 658 | #ifdef CONFIG_SMP |
293afe44 JV |
659 | if (blacklisted) |
660 | return blacklisted; | |
661 | blacklisted = acpi_cpufreq_blacklist(c); | |
662 | if (blacklisted) | |
663 | return blacklisted; | |
1a8e42fa PB |
664 | #endif |
665 | ||
d5b73cd8 | 666 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
1da177e4 | 667 | if (!data) |
64be7eed | 668 | return -ENOMEM; |
1da177e4 | 669 | |
f4fd3797 LT |
670 | if (!zalloc_cpumask_var(&data->freqdomain_cpus, GFP_KERNEL)) { |
671 | result = -ENOMEM; | |
672 | goto err_free; | |
673 | } | |
674 | ||
b36128c8 | 675 | data->acpi_data = per_cpu_ptr(acpi_perf_data, cpu); |
f1625066 | 676 | per_cpu(acfreq_data, cpu) = data; |
1da177e4 | 677 | |
95dd7227 | 678 | if (cpu_has(c, X86_FEATURE_CONSTANT_TSC)) |
fe27cb35 | 679 | acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS; |
1da177e4 | 680 | |
fe27cb35 | 681 | result = acpi_processor_register_performance(data->acpi_data, cpu); |
1da177e4 | 682 | if (result) |
f4fd3797 | 683 | goto err_free_mask; |
1da177e4 | 684 | |
09b4d1ee | 685 | perf = data->acpi_data; |
09b4d1ee | 686 | policy->shared_type = perf->shared_type; |
95dd7227 | 687 | |
46f18e3a | 688 | /* |
95dd7227 | 689 | * Will let policy->cpus know about dependency only when software |
46f18e3a VP |
690 | * coordination is required. |
691 | */ | |
692 | if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL || | |
8adcc0c6 | 693 | policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) { |
835481d9 | 694 | cpumask_copy(policy->cpus, perf->shared_cpu_map); |
8adcc0c6 | 695 | } |
f4fd3797 | 696 | cpumask_copy(data->freqdomain_cpus, perf->shared_cpu_map); |
8adcc0c6 VP |
697 | |
698 | #ifdef CONFIG_SMP | |
699 | dmi_check_system(sw_any_bug_dmi_table); | |
2624f90c | 700 | if (bios_with_sw_any_bug && !policy_is_shared(policy)) { |
8adcc0c6 | 701 | policy->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
3280c3c8 | 702 | cpumask_copy(policy->cpus, topology_core_cpumask(cpu)); |
8adcc0c6 | 703 | } |
acd31624 AP |
704 | |
705 | if (check_amd_hwpstate_cpu(cpu) && !acpi_pstate_strict) { | |
706 | cpumask_clear(policy->cpus); | |
707 | cpumask_set_cpu(cpu, policy->cpus); | |
3280c3c8 BG |
708 | cpumask_copy(data->freqdomain_cpus, |
709 | topology_sibling_cpumask(cpu)); | |
acd31624 AP |
710 | policy->shared_type = CPUFREQ_SHARED_TYPE_HW; |
711 | pr_info_once(PFX "overriding BIOS provided _PSD data\n"); | |
712 | } | |
8adcc0c6 | 713 | #endif |
09b4d1ee | 714 | |
1da177e4 | 715 | /* capability check */ |
09b4d1ee | 716 | if (perf->state_count <= 1) { |
2d06d8c4 | 717 | pr_debug("No P-States\n"); |
1da177e4 LT |
718 | result = -ENODEV; |
719 | goto err_unreg; | |
720 | } | |
09b4d1ee | 721 | |
fe27cb35 VP |
722 | if (perf->control_register.space_id != perf->status_register.space_id) { |
723 | result = -ENODEV; | |
724 | goto err_unreg; | |
725 | } | |
726 | ||
727 | switch (perf->control_register.space_id) { | |
64be7eed | 728 | case ACPI_ADR_SPACE_SYSTEM_IO: |
c40a4518 MG |
729 | if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD && |
730 | boot_cpu_data.x86 == 0xf) { | |
731 | pr_debug("AMD K8 systems must use native drivers.\n"); | |
732 | result = -ENODEV; | |
733 | goto err_unreg; | |
734 | } | |
2d06d8c4 | 735 | pr_debug("SYSTEM IO addr space\n"); |
dde9f7ba VP |
736 | data->cpu_feature = SYSTEM_IO_CAPABLE; |
737 | break; | |
64be7eed | 738 | case ACPI_ADR_SPACE_FIXED_HARDWARE: |
2d06d8c4 | 739 | pr_debug("HARDWARE addr space\n"); |
3dc9a633 MG |
740 | if (check_est_cpu(cpu)) { |
741 | data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE; | |
742 | break; | |
dde9f7ba | 743 | } |
3dc9a633 MG |
744 | if (check_amd_hwpstate_cpu(cpu)) { |
745 | data->cpu_feature = SYSTEM_AMD_MSR_CAPABLE; | |
746 | break; | |
747 | } | |
748 | result = -ENODEV; | |
749 | goto err_unreg; | |
64be7eed | 750 | default: |
2d06d8c4 | 751 | pr_debug("Unknown addr space %d\n", |
64be7eed | 752 | (u32) (perf->control_register.space_id)); |
1da177e4 LT |
753 | result = -ENODEV; |
754 | goto err_unreg; | |
755 | } | |
756 | ||
71508a1f | 757 | data->freq_table = kzalloc(sizeof(*data->freq_table) * |
95dd7227 | 758 | (perf->state_count+1), GFP_KERNEL); |
1da177e4 LT |
759 | if (!data->freq_table) { |
760 | result = -ENOMEM; | |
761 | goto err_unreg; | |
762 | } | |
763 | ||
764 | /* detect transition latency */ | |
765 | policy->cpuinfo.transition_latency = 0; | |
3a58df35 | 766 | for (i = 0; i < perf->state_count; i++) { |
64be7eed VP |
767 | if ((perf->states[i].transition_latency * 1000) > |
768 | policy->cpuinfo.transition_latency) | |
769 | policy->cpuinfo.transition_latency = | |
770 | perf->states[i].transition_latency * 1000; | |
1da177e4 | 771 | } |
1da177e4 | 772 | |
a59d1637 PV |
773 | /* Check for high latency (>20uS) from buggy BIOSes, like on T42 */ |
774 | if (perf->control_register.space_id == ACPI_ADR_SPACE_FIXED_HARDWARE && | |
775 | policy->cpuinfo.transition_latency > 20 * 1000) { | |
a59d1637 | 776 | policy->cpuinfo.transition_latency = 20 * 1000; |
61c8c67e JP |
777 | printk_once(KERN_INFO |
778 | "P-state transition latency capped at 20 uS\n"); | |
a59d1637 PV |
779 | } |
780 | ||
1da177e4 | 781 | /* table init */ |
3a58df35 DJ |
782 | for (i = 0; i < perf->state_count; i++) { |
783 | if (i > 0 && perf->states[i].core_frequency >= | |
3cdf552b | 784 | data->freq_table[valid_states-1].frequency / 1000) |
fe27cb35 VP |
785 | continue; |
786 | ||
50701588 | 787 | data->freq_table[valid_states].driver_data = i; |
fe27cb35 | 788 | data->freq_table[valid_states].frequency = |
64be7eed | 789 | perf->states[i].core_frequency * 1000; |
fe27cb35 | 790 | valid_states++; |
1da177e4 | 791 | } |
3d4a7ef3 | 792 | data->freq_table[valid_states].frequency = CPUFREQ_TABLE_END; |
8edc59d9 | 793 | perf->state = 0; |
1da177e4 | 794 | |
776b57be | 795 | result = cpufreq_table_validate_and_show(policy, data->freq_table); |
95dd7227 | 796 | if (result) |
1da177e4 | 797 | goto err_freqfree; |
1da177e4 | 798 | |
d876dfbb TR |
799 | if (perf->states[0].core_frequency * 1000 != policy->cpuinfo.max_freq) |
800 | printk(KERN_WARNING FW_WARN "P-state 0 is not max freq\n"); | |
801 | ||
a507ac4b | 802 | switch (perf->control_register.space_id) { |
64be7eed | 803 | case ACPI_ADR_SPACE_SYSTEM_IO: |
1bab64d5 VK |
804 | /* |
805 | * The core will not set policy->cur, because | |
806 | * cpufreq_driver->get is NULL, so we need to set it here. | |
807 | * However, we have to guess it, because the current speed is | |
808 | * unknown and not detectable via IO ports. | |
809 | */ | |
dde9f7ba VP |
810 | policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu); |
811 | break; | |
64be7eed | 812 | case ACPI_ADR_SPACE_FIXED_HARDWARE: |
7650b281 | 813 | acpi_cpufreq_driver.get = get_cur_freq_on_cpu; |
dde9f7ba | 814 | break; |
64be7eed | 815 | default: |
dde9f7ba VP |
816 | break; |
817 | } | |
818 | ||
1da177e4 LT |
819 | /* notify BIOS that we exist */ |
820 | acpi_processor_notify_smm(THIS_MODULE); | |
821 | ||
2d06d8c4 | 822 | pr_debug("CPU%u - ACPI performance management activated.\n", cpu); |
09b4d1ee | 823 | for (i = 0; i < perf->state_count; i++) |
2d06d8c4 | 824 | pr_debug(" %cP%d: %d MHz, %d mW, %d uS\n", |
64be7eed | 825 | (i == perf->state ? '*' : ' '), i, |
09b4d1ee VP |
826 | (u32) perf->states[i].core_frequency, |
827 | (u32) perf->states[i].power, | |
828 | (u32) perf->states[i].transition_latency); | |
1da177e4 | 829 | |
4b31e774 DB |
830 | /* |
831 | * the first call to ->target() should result in us actually | |
832 | * writing something to the appropriate registers. | |
833 | */ | |
834 | data->resume = 1; | |
64be7eed | 835 | |
fe27cb35 | 836 | return result; |
1da177e4 | 837 | |
95dd7227 | 838 | err_freqfree: |
1da177e4 | 839 | kfree(data->freq_table); |
95dd7227 | 840 | err_unreg: |
09b4d1ee | 841 | acpi_processor_unregister_performance(perf, cpu); |
f4fd3797 LT |
842 | err_free_mask: |
843 | free_cpumask_var(data->freqdomain_cpus); | |
95dd7227 | 844 | err_free: |
1da177e4 | 845 | kfree(data); |
f1625066 | 846 | per_cpu(acfreq_data, cpu) = NULL; |
1da177e4 | 847 | |
64be7eed | 848 | return result; |
1da177e4 LT |
849 | } |
850 | ||
64be7eed | 851 | static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy) |
1da177e4 | 852 | { |
f1625066 | 853 | struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu); |
1da177e4 | 854 | |
2d06d8c4 | 855 | pr_debug("acpi_cpufreq_cpu_exit\n"); |
1da177e4 LT |
856 | |
857 | if (data) { | |
f1625066 | 858 | per_cpu(acfreq_data, policy->cpu) = NULL; |
64be7eed VP |
859 | acpi_processor_unregister_performance(data->acpi_data, |
860 | policy->cpu); | |
f4fd3797 | 861 | free_cpumask_var(data->freqdomain_cpus); |
dab5fff1 | 862 | kfree(data->freq_table); |
1da177e4 LT |
863 | kfree(data); |
864 | } | |
865 | ||
64be7eed | 866 | return 0; |
1da177e4 LT |
867 | } |
868 | ||
64be7eed | 869 | static int acpi_cpufreq_resume(struct cpufreq_policy *policy) |
1da177e4 | 870 | { |
f1625066 | 871 | struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu); |
1da177e4 | 872 | |
2d06d8c4 | 873 | pr_debug("acpi_cpufreq_resume\n"); |
1da177e4 LT |
874 | |
875 | data->resume = 1; | |
876 | ||
64be7eed | 877 | return 0; |
1da177e4 LT |
878 | } |
879 | ||
64be7eed | 880 | static struct freq_attr *acpi_cpufreq_attr[] = { |
1da177e4 | 881 | &cpufreq_freq_attr_scaling_available_freqs, |
f4fd3797 | 882 | &freqdomain_cpus, |
11269ff5 | 883 | NULL, /* this is a placeholder for cpb, do not remove */ |
1da177e4 LT |
884 | NULL, |
885 | }; | |
886 | ||
887 | static struct cpufreq_driver acpi_cpufreq_driver = { | |
db9be219 | 888 | .verify = cpufreq_generic_frequency_table_verify, |
9c0ebcf7 | 889 | .target_index = acpi_cpufreq_target, |
e2f74f35 TR |
890 | .bios_limit = acpi_processor_get_bios_limit, |
891 | .init = acpi_cpufreq_cpu_init, | |
892 | .exit = acpi_cpufreq_cpu_exit, | |
893 | .resume = acpi_cpufreq_resume, | |
894 | .name = "acpi-cpufreq", | |
e2f74f35 | 895 | .attr = acpi_cpufreq_attr, |
cfc9c8ed | 896 | .set_boost = _store_boost, |
1da177e4 LT |
897 | }; |
898 | ||
615b7300 AP |
899 | static void __init acpi_cpufreq_boost_init(void) |
900 | { | |
901 | if (boot_cpu_has(X86_FEATURE_CPB) || boot_cpu_has(X86_FEATURE_IDA)) { | |
902 | msrs = msrs_alloc(); | |
903 | ||
904 | if (!msrs) | |
905 | return; | |
906 | ||
cfc9c8ed LM |
907 | acpi_cpufreq_driver.boost_supported = true; |
908 | acpi_cpufreq_driver.boost_enabled = boost_state(0); | |
0197fbd2 SB |
909 | |
910 | cpu_notifier_register_begin(); | |
615b7300 AP |
911 | |
912 | /* Force all MSRs to the same value */ | |
cfc9c8ed LM |
913 | boost_set_msrs(acpi_cpufreq_driver.boost_enabled, |
914 | cpu_online_mask); | |
615b7300 | 915 | |
0197fbd2 | 916 | __register_cpu_notifier(&boost_nb); |
615b7300 | 917 | |
0197fbd2 | 918 | cpu_notifier_register_done(); |
cfc9c8ed | 919 | } |
615b7300 AP |
920 | } |
921 | ||
eb8c68ef | 922 | static void acpi_cpufreq_boost_exit(void) |
615b7300 | 923 | { |
615b7300 AP |
924 | if (msrs) { |
925 | unregister_cpu_notifier(&boost_nb); | |
926 | ||
927 | msrs_free(msrs); | |
928 | msrs = NULL; | |
929 | } | |
930 | } | |
931 | ||
64be7eed | 932 | static int __init acpi_cpufreq_init(void) |
1da177e4 | 933 | { |
50109292 FY |
934 | int ret; |
935 | ||
75c07581 RW |
936 | if (acpi_disabled) |
937 | return -ENODEV; | |
938 | ||
8a61e12e YL |
939 | /* don't keep reloading if cpufreq_driver exists */ |
940 | if (cpufreq_get_current_driver()) | |
75c07581 | 941 | return -EEXIST; |
ee297533 | 942 | |
2d06d8c4 | 943 | pr_debug("acpi_cpufreq_init\n"); |
1da177e4 | 944 | |
50109292 FY |
945 | ret = acpi_cpufreq_early_init(); |
946 | if (ret) | |
947 | return ret; | |
09b4d1ee | 948 | |
11269ff5 AP |
949 | #ifdef CONFIG_X86_ACPI_CPUFREQ_CPB |
950 | /* this is a sysfs file with a strange name and an even stranger | |
951 | * semantic - per CPU instantiation, but system global effect. | |
952 | * Lets enable it only on AMD CPUs for compatibility reasons and | |
953 | * only if configured. This is considered legacy code, which | |
954 | * will probably be removed at some point in the future. | |
955 | */ | |
956 | if (check_amd_hwpstate_cpu(0)) { | |
957 | struct freq_attr **iter; | |
958 | ||
959 | pr_debug("adding sysfs entry for cpb\n"); | |
960 | ||
961 | for (iter = acpi_cpufreq_attr; *iter != NULL; iter++) | |
962 | ; | |
963 | ||
964 | /* make sure there is a terminator behind it */ | |
965 | if (iter[1] == NULL) | |
966 | *iter = &cpb; | |
967 | } | |
968 | #endif | |
cfc9c8ed | 969 | acpi_cpufreq_boost_init(); |
11269ff5 | 970 | |
847aef6f | 971 | ret = cpufreq_register_driver(&acpi_cpufreq_driver); |
eb8c68ef | 972 | if (ret) { |
2fdf66b4 | 973 | free_acpi_perf_data(); |
eb8c68ef KRW |
974 | acpi_cpufreq_boost_exit(); |
975 | } | |
847aef6f | 976 | return ret; |
1da177e4 LT |
977 | } |
978 | ||
64be7eed | 979 | static void __exit acpi_cpufreq_exit(void) |
1da177e4 | 980 | { |
2d06d8c4 | 981 | pr_debug("acpi_cpufreq_exit\n"); |
1da177e4 | 982 | |
615b7300 AP |
983 | acpi_cpufreq_boost_exit(); |
984 | ||
1da177e4 LT |
985 | cpufreq_unregister_driver(&acpi_cpufreq_driver); |
986 | ||
50f4ddd4 | 987 | free_acpi_perf_data(); |
1da177e4 LT |
988 | } |
989 | ||
d395bf12 | 990 | module_param(acpi_pstate_strict, uint, 0644); |
64be7eed | 991 | MODULE_PARM_DESC(acpi_pstate_strict, |
95dd7227 DJ |
992 | "value 0 or non-zero. non-zero -> strict ACPI checks are " |
993 | "performed during frequency changes."); | |
1da177e4 LT |
994 | |
995 | late_initcall(acpi_cpufreq_init); | |
996 | module_exit(acpi_cpufreq_exit); | |
997 | ||
efa17194 MG |
998 | static const struct x86_cpu_id acpi_cpufreq_ids[] = { |
999 | X86_FEATURE_MATCH(X86_FEATURE_ACPI), | |
1000 | X86_FEATURE_MATCH(X86_FEATURE_HW_PSTATE), | |
1001 | {} | |
1002 | }; | |
1003 | MODULE_DEVICE_TABLE(x86cpu, acpi_cpufreq_ids); | |
1004 | ||
c655affb RW |
1005 | static const struct acpi_device_id processor_device_ids[] = { |
1006 | {ACPI_PROCESSOR_OBJECT_HID, }, | |
1007 | {ACPI_PROCESSOR_DEVICE_HID, }, | |
1008 | {}, | |
1009 | }; | |
1010 | MODULE_DEVICE_TABLE(acpi, processor_device_ids); | |
1011 | ||
1da177e4 | 1012 | MODULE_ALIAS("acpi"); |