Commit | Line | Data |
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1da177e4 | 1 | /* |
fe27cb35 | 2 | * acpi-cpufreq.c - ACPI Processor P-States Driver ($Revision: 1.4 $) |
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> |
f3f47a67 | 36 | #include <linux/ftrace.h> |
1da177e4 LT |
37 | |
38 | #include <linux/acpi.h> | |
39 | #include <acpi/processor.h> | |
40 | ||
fe27cb35 | 41 | #include <asm/io.h> |
dde9f7ba | 42 | #include <asm/msr.h> |
fe27cb35 VP |
43 | #include <asm/processor.h> |
44 | #include <asm/cpufeature.h> | |
45 | #include <asm/delay.h> | |
46 | #include <asm/uaccess.h> | |
47 | ||
1da177e4 LT |
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 | ||
dde9f7ba VP |
54 | enum { |
55 | UNDEFINED_CAPABLE = 0, | |
56 | SYSTEM_INTEL_MSR_CAPABLE, | |
57 | SYSTEM_IO_CAPABLE, | |
58 | }; | |
59 | ||
60 | #define INTEL_MSR_RANGE (0xffff) | |
dfde5d62 | 61 | #define CPUID_6_ECX_APERFMPERF_CAPABILITY (0x1) |
dde9f7ba | 62 | |
fe27cb35 | 63 | struct acpi_cpufreq_data { |
64be7eed VP |
64 | struct acpi_processor_performance *acpi_data; |
65 | struct cpufreq_frequency_table *freq_table; | |
dfde5d62 | 66 | unsigned int max_freq; |
64be7eed VP |
67 | unsigned int resume; |
68 | unsigned int cpu_feature; | |
1da177e4 LT |
69 | }; |
70 | ||
ea348f3e | 71 | static DEFINE_PER_CPU(struct acpi_cpufreq_data *, drv_data); |
72 | ||
50109292 FY |
73 | /* acpi_perf_data is a pointer to percpu data. */ |
74 | static struct acpi_processor_performance *acpi_perf_data; | |
1da177e4 LT |
75 | |
76 | static struct cpufreq_driver acpi_cpufreq_driver; | |
77 | ||
d395bf12 VP |
78 | static unsigned int acpi_pstate_strict; |
79 | ||
dde9f7ba VP |
80 | static int check_est_cpu(unsigned int cpuid) |
81 | { | |
92cb7612 | 82 | struct cpuinfo_x86 *cpu = &cpu_data(cpuid); |
dde9f7ba VP |
83 | |
84 | if (cpu->x86_vendor != X86_VENDOR_INTEL || | |
64be7eed | 85 | !cpu_has(cpu, X86_FEATURE_EST)) |
dde9f7ba VP |
86 | return 0; |
87 | ||
88 | return 1; | |
89 | } | |
90 | ||
dde9f7ba | 91 | static unsigned extract_io(u32 value, struct acpi_cpufreq_data *data) |
fe27cb35 | 92 | { |
64be7eed VP |
93 | struct acpi_processor_performance *perf; |
94 | int i; | |
fe27cb35 VP |
95 | |
96 | perf = data->acpi_data; | |
97 | ||
95dd7227 | 98 | for (i=0; i<perf->state_count; i++) { |
fe27cb35 VP |
99 | if (value == perf->states[i].status) |
100 | return data->freq_table[i].frequency; | |
101 | } | |
102 | return 0; | |
103 | } | |
104 | ||
dde9f7ba VP |
105 | static unsigned extract_msr(u32 msr, struct acpi_cpufreq_data *data) |
106 | { | |
107 | int i; | |
a6f6e6e6 | 108 | struct acpi_processor_performance *perf; |
dde9f7ba VP |
109 | |
110 | msr &= INTEL_MSR_RANGE; | |
a6f6e6e6 VP |
111 | perf = data->acpi_data; |
112 | ||
95dd7227 | 113 | for (i=0; data->freq_table[i].frequency != CPUFREQ_TABLE_END; i++) { |
a6f6e6e6 | 114 | if (msr == perf->states[data->freq_table[i].index].status) |
dde9f7ba VP |
115 | return data->freq_table[i].frequency; |
116 | } | |
117 | return data->freq_table[0].frequency; | |
118 | } | |
119 | ||
dde9f7ba VP |
120 | static unsigned extract_freq(u32 val, struct acpi_cpufreq_data *data) |
121 | { | |
122 | switch (data->cpu_feature) { | |
64be7eed | 123 | case SYSTEM_INTEL_MSR_CAPABLE: |
dde9f7ba | 124 | return extract_msr(val, data); |
64be7eed | 125 | case SYSTEM_IO_CAPABLE: |
dde9f7ba | 126 | return extract_io(val, data); |
64be7eed | 127 | default: |
dde9f7ba VP |
128 | return 0; |
129 | } | |
130 | } | |
131 | ||
dde9f7ba VP |
132 | struct msr_addr { |
133 | u32 reg; | |
134 | }; | |
135 | ||
fe27cb35 VP |
136 | struct io_addr { |
137 | u16 port; | |
138 | u8 bit_width; | |
139 | }; | |
140 | ||
dde9f7ba VP |
141 | typedef union { |
142 | struct msr_addr msr; | |
143 | struct io_addr io; | |
144 | } drv_addr_union; | |
145 | ||
fe27cb35 | 146 | struct drv_cmd { |
dde9f7ba | 147 | unsigned int type; |
bfa318ad | 148 | const struct cpumask *mask; |
dde9f7ba | 149 | drv_addr_union addr; |
fe27cb35 VP |
150 | u32 val; |
151 | }; | |
152 | ||
72859081 | 153 | static long do_drv_read(void *_cmd) |
1da177e4 | 154 | { |
72859081 | 155 | struct drv_cmd *cmd = _cmd; |
dde9f7ba VP |
156 | u32 h; |
157 | ||
158 | switch (cmd->type) { | |
64be7eed | 159 | case SYSTEM_INTEL_MSR_CAPABLE: |
dde9f7ba VP |
160 | rdmsr(cmd->addr.msr.reg, cmd->val, h); |
161 | break; | |
64be7eed | 162 | case SYSTEM_IO_CAPABLE: |
4e581ff1 VP |
163 | acpi_os_read_port((acpi_io_address)cmd->addr.io.port, |
164 | &cmd->val, | |
165 | (u32)cmd->addr.io.bit_width); | |
dde9f7ba | 166 | break; |
64be7eed | 167 | default: |
dde9f7ba VP |
168 | break; |
169 | } | |
72859081 | 170 | return 0; |
fe27cb35 | 171 | } |
1da177e4 | 172 | |
72859081 | 173 | static long do_drv_write(void *_cmd) |
fe27cb35 | 174 | { |
72859081 | 175 | struct drv_cmd *cmd = _cmd; |
13424f65 | 176 | u32 lo, hi; |
dde9f7ba VP |
177 | |
178 | switch (cmd->type) { | |
64be7eed | 179 | case SYSTEM_INTEL_MSR_CAPABLE: |
13424f65 VP |
180 | rdmsr(cmd->addr.msr.reg, lo, hi); |
181 | lo = (lo & ~INTEL_MSR_RANGE) | (cmd->val & INTEL_MSR_RANGE); | |
182 | wrmsr(cmd->addr.msr.reg, lo, hi); | |
dde9f7ba | 183 | break; |
64be7eed | 184 | case SYSTEM_IO_CAPABLE: |
4e581ff1 VP |
185 | acpi_os_write_port((acpi_io_address)cmd->addr.io.port, |
186 | cmd->val, | |
187 | (u32)cmd->addr.io.bit_width); | |
dde9f7ba | 188 | break; |
64be7eed | 189 | default: |
dde9f7ba VP |
190 | break; |
191 | } | |
72859081 | 192 | return 0; |
fe27cb35 | 193 | } |
1da177e4 | 194 | |
95dd7227 | 195 | static void drv_read(struct drv_cmd *cmd) |
fe27cb35 | 196 | { |
fe27cb35 VP |
197 | cmd->val = 0; |
198 | ||
72859081 | 199 | work_on_cpu(cpumask_any(cmd->mask), do_drv_read, cmd); |
fe27cb35 VP |
200 | } |
201 | ||
202 | static void drv_write(struct drv_cmd *cmd) | |
203 | { | |
64be7eed | 204 | unsigned int i; |
fe27cb35 | 205 | |
4d8bb537 | 206 | for_each_cpu(i, cmd->mask) { |
72859081 | 207 | work_on_cpu(i, do_drv_write, cmd); |
1da177e4 | 208 | } |
fe27cb35 | 209 | } |
1da177e4 | 210 | |
4d8bb537 | 211 | static u32 get_cur_val(const struct cpumask *mask) |
fe27cb35 | 212 | { |
64be7eed VP |
213 | struct acpi_processor_performance *perf; |
214 | struct drv_cmd cmd; | |
1da177e4 | 215 | |
4d8bb537 | 216 | if (unlikely(cpumask_empty(mask))) |
fe27cb35 | 217 | return 0; |
1da177e4 | 218 | |
4d8bb537 | 219 | switch (per_cpu(drv_data, cpumask_first(mask))->cpu_feature) { |
dde9f7ba VP |
220 | case SYSTEM_INTEL_MSR_CAPABLE: |
221 | cmd.type = SYSTEM_INTEL_MSR_CAPABLE; | |
222 | cmd.addr.msr.reg = MSR_IA32_PERF_STATUS; | |
223 | break; | |
224 | case SYSTEM_IO_CAPABLE: | |
225 | cmd.type = SYSTEM_IO_CAPABLE; | |
4d8bb537 | 226 | perf = per_cpu(drv_data, cpumask_first(mask))->acpi_data; |
dde9f7ba VP |
227 | cmd.addr.io.port = perf->control_register.address; |
228 | cmd.addr.io.bit_width = perf->control_register.bit_width; | |
229 | break; | |
230 | default: | |
231 | return 0; | |
232 | } | |
233 | ||
bfa318ad | 234 | cmd.mask = mask; |
fe27cb35 | 235 | drv_read(&cmd); |
1da177e4 | 236 | |
fe27cb35 VP |
237 | dprintk("get_cur_val = %u\n", cmd.val); |
238 | ||
239 | return cmd.val; | |
240 | } | |
1da177e4 | 241 | |
e39ad415 MT |
242 | struct perf_cur { |
243 | union { | |
244 | struct { | |
245 | u32 lo; | |
246 | u32 hi; | |
247 | } split; | |
248 | u64 whole; | |
249 | } aperf_cur, mperf_cur; | |
250 | }; | |
251 | ||
252 | ||
253 | static long read_measured_perf_ctrs(void *_cur) | |
254 | { | |
255 | struct perf_cur *cur = _cur; | |
256 | ||
257 | rdmsr(MSR_IA32_APERF, cur->aperf_cur.split.lo, cur->aperf_cur.split.hi); | |
258 | rdmsr(MSR_IA32_MPERF, cur->mperf_cur.split.lo, cur->mperf_cur.split.hi); | |
259 | ||
260 | wrmsr(MSR_IA32_APERF, 0, 0); | |
261 | wrmsr(MSR_IA32_MPERF, 0, 0); | |
262 | ||
263 | return 0; | |
264 | } | |
265 | ||
dfde5d62 VP |
266 | /* |
267 | * Return the measured active (C0) frequency on this CPU since last call | |
268 | * to this function. | |
269 | * Input: cpu number | |
270 | * Return: Average CPU frequency in terms of max frequency (zero on error) | |
271 | * | |
272 | * We use IA32_MPERF and IA32_APERF MSRs to get the measured performance | |
273 | * over a period of time, while CPU is in C0 state. | |
274 | * IA32_MPERF counts at the rate of max advertised frequency | |
275 | * IA32_APERF counts at the rate of actual CPU frequency | |
276 | * Only IA32_APERF/IA32_MPERF ratio is architecturally defined and | |
277 | * no meaning should be associated with absolute values of these MSRs. | |
278 | */ | |
bf0b90e3 | 279 | static unsigned int get_measured_perf(struct cpufreq_policy *policy, |
280 | unsigned int cpu) | |
dfde5d62 | 281 | { |
e39ad415 | 282 | struct perf_cur cur; |
dfde5d62 VP |
283 | unsigned int perf_percent; |
284 | unsigned int retval; | |
285 | ||
e39ad415 | 286 | if (!work_on_cpu(cpu, read_measured_perf_ctrs, &cur)) |
dfde5d62 | 287 | return 0; |
dfde5d62 VP |
288 | |
289 | #ifdef __i386__ | |
290 | /* | |
291 | * We dont want to do 64 bit divide with 32 bit kernel | |
292 | * Get an approximate value. Return failure in case we cannot get | |
293 | * an approximate value. | |
294 | */ | |
e39ad415 | 295 | if (unlikely(cur.aperf_cur.split.hi || cur.mperf_cur.split.hi)) { |
dfde5d62 VP |
296 | int shift_count; |
297 | u32 h; | |
298 | ||
e39ad415 | 299 | h = max_t(u32, cur.aperf_cur.split.hi, cur.mperf_cur.split.hi); |
dfde5d62 VP |
300 | shift_count = fls(h); |
301 | ||
e39ad415 MT |
302 | cur.aperf_cur.whole >>= shift_count; |
303 | cur.mperf_cur.whole >>= shift_count; | |
dfde5d62 VP |
304 | } |
305 | ||
e39ad415 | 306 | if (((unsigned long)(-1) / 100) < cur.aperf_cur.split.lo) { |
dfde5d62 | 307 | int shift_count = 7; |
e39ad415 MT |
308 | cur.aperf_cur.split.lo >>= shift_count; |
309 | cur.mperf_cur.split.lo >>= shift_count; | |
dfde5d62 VP |
310 | } |
311 | ||
e39ad415 MT |
312 | if (cur.aperf_cur.split.lo && cur.mperf_cur.split.lo) |
313 | perf_percent = (cur.aperf_cur.split.lo * 100) / | |
314 | cur.mperf_cur.split.lo; | |
95dd7227 | 315 | else |
dfde5d62 | 316 | perf_percent = 0; |
dfde5d62 VP |
317 | |
318 | #else | |
e39ad415 | 319 | if (unlikely(((unsigned long)(-1) / 100) < cur.aperf_cur.whole)) { |
dfde5d62 | 320 | int shift_count = 7; |
e39ad415 MT |
321 | cur.aperf_cur.whole >>= shift_count; |
322 | cur.mperf_cur.whole >>= shift_count; | |
dfde5d62 VP |
323 | } |
324 | ||
e39ad415 MT |
325 | if (cur.aperf_cur.whole && cur.mperf_cur.whole) |
326 | perf_percent = (cur.aperf_cur.whole * 100) / | |
327 | cur.mperf_cur.whole; | |
95dd7227 | 328 | else |
dfde5d62 | 329 | perf_percent = 0; |
dfde5d62 VP |
330 | |
331 | #endif | |
332 | ||
bf0b90e3 | 333 | retval = per_cpu(drv_data, policy->cpu)->max_freq * perf_percent / 100; |
dfde5d62 | 334 | |
dfde5d62 VP |
335 | return retval; |
336 | } | |
337 | ||
fe27cb35 VP |
338 | static unsigned int get_cur_freq_on_cpu(unsigned int cpu) |
339 | { | |
ea348f3e | 340 | struct acpi_cpufreq_data *data = per_cpu(drv_data, cpu); |
64be7eed | 341 | unsigned int freq; |
e56a727b | 342 | unsigned int cached_freq; |
fe27cb35 VP |
343 | |
344 | dprintk("get_cur_freq_on_cpu (%d)\n", cpu); | |
345 | ||
346 | if (unlikely(data == NULL || | |
64be7eed | 347 | data->acpi_data == NULL || data->freq_table == NULL)) { |
fe27cb35 | 348 | return 0; |
1da177e4 LT |
349 | } |
350 | ||
e56a727b | 351 | cached_freq = data->freq_table[data->acpi_data->state].frequency; |
e39ad415 | 352 | freq = extract_freq(get_cur_val(cpumask_of(cpu)), data); |
e56a727b VP |
353 | if (freq != cached_freq) { |
354 | /* | |
355 | * The dreaded BIOS frequency change behind our back. | |
356 | * Force set the frequency on next target call. | |
357 | */ | |
358 | data->resume = 1; | |
359 | } | |
360 | ||
fe27cb35 | 361 | dprintk("cur freq = %u\n", freq); |
1da177e4 | 362 | |
fe27cb35 | 363 | return freq; |
1da177e4 LT |
364 | } |
365 | ||
72859081 | 366 | static unsigned int check_freqs(const struct cpumask *mask, unsigned int freq, |
64be7eed | 367 | struct acpi_cpufreq_data *data) |
fe27cb35 | 368 | { |
64be7eed VP |
369 | unsigned int cur_freq; |
370 | unsigned int i; | |
1da177e4 | 371 | |
95dd7227 | 372 | for (i=0; i<100; i++) { |
fe27cb35 VP |
373 | cur_freq = extract_freq(get_cur_val(mask), data); |
374 | if (cur_freq == freq) | |
375 | return 1; | |
376 | udelay(10); | |
377 | } | |
378 | return 0; | |
379 | } | |
380 | ||
381 | static int acpi_cpufreq_target(struct cpufreq_policy *policy, | |
64be7eed | 382 | unsigned int target_freq, unsigned int relation) |
1da177e4 | 383 | { |
ea348f3e | 384 | struct acpi_cpufreq_data *data = per_cpu(drv_data, policy->cpu); |
64be7eed VP |
385 | struct acpi_processor_performance *perf; |
386 | struct cpufreq_freqs freqs; | |
64be7eed | 387 | struct drv_cmd cmd; |
8edc59d9 VP |
388 | unsigned int next_state = 0; /* Index into freq_table */ |
389 | unsigned int next_perf_state = 0; /* Index into perf table */ | |
64be7eed VP |
390 | unsigned int i; |
391 | int result = 0; | |
f3f47a67 | 392 | struct power_trace it; |
fe27cb35 VP |
393 | |
394 | dprintk("acpi_cpufreq_target %d (%d)\n", target_freq, policy->cpu); | |
395 | ||
396 | if (unlikely(data == NULL || | |
95dd7227 | 397 | data->acpi_data == NULL || data->freq_table == NULL)) { |
fe27cb35 VP |
398 | return -ENODEV; |
399 | } | |
1da177e4 | 400 | |
fe27cb35 | 401 | perf = data->acpi_data; |
1da177e4 | 402 | result = cpufreq_frequency_table_target(policy, |
64be7eed VP |
403 | data->freq_table, |
404 | target_freq, | |
405 | relation, &next_state); | |
4d8bb537 MT |
406 | if (unlikely(result)) { |
407 | result = -ENODEV; | |
408 | goto out; | |
409 | } | |
1da177e4 | 410 | |
fe27cb35 | 411 | next_perf_state = data->freq_table[next_state].index; |
7650b281 | 412 | if (perf->state == next_perf_state) { |
fe27cb35 | 413 | if (unlikely(data->resume)) { |
64be7eed VP |
414 | dprintk("Called after resume, resetting to P%d\n", |
415 | next_perf_state); | |
fe27cb35 VP |
416 | data->resume = 0; |
417 | } else { | |
64be7eed VP |
418 | dprintk("Already at target state (P%d)\n", |
419 | next_perf_state); | |
4d8bb537 | 420 | goto out; |
fe27cb35 | 421 | } |
09b4d1ee VP |
422 | } |
423 | ||
f3f47a67 AV |
424 | trace_power_mark(&it, POWER_PSTATE, next_perf_state); |
425 | ||
64be7eed VP |
426 | switch (data->cpu_feature) { |
427 | case SYSTEM_INTEL_MSR_CAPABLE: | |
428 | cmd.type = SYSTEM_INTEL_MSR_CAPABLE; | |
429 | cmd.addr.msr.reg = MSR_IA32_PERF_CTL; | |
13424f65 | 430 | cmd.val = (u32) perf->states[next_perf_state].control; |
64be7eed VP |
431 | break; |
432 | case SYSTEM_IO_CAPABLE: | |
433 | cmd.type = SYSTEM_IO_CAPABLE; | |
434 | cmd.addr.io.port = perf->control_register.address; | |
435 | cmd.addr.io.bit_width = perf->control_register.bit_width; | |
436 | cmd.val = (u32) perf->states[next_perf_state].control; | |
437 | break; | |
438 | default: | |
4d8bb537 MT |
439 | result = -ENODEV; |
440 | goto out; | |
64be7eed | 441 | } |
09b4d1ee | 442 | |
4d8bb537 | 443 | /* cpufreq holds the hotplug lock, so we are safe from here on */ |
fe27cb35 | 444 | if (policy->shared_type != CPUFREQ_SHARED_TYPE_ANY) |
bfa318ad | 445 | cmd.mask = policy->cpus; |
fe27cb35 | 446 | else |
bfa318ad | 447 | cmd.mask = cpumask_of(policy->cpu); |
09b4d1ee | 448 | |
8edc59d9 VP |
449 | freqs.old = perf->states[perf->state].core_frequency * 1000; |
450 | freqs.new = data->freq_table[next_state].frequency; | |
4d8bb537 | 451 | for_each_cpu(i, cmd.mask) { |
fe27cb35 VP |
452 | freqs.cpu = i; |
453 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); | |
09b4d1ee | 454 | } |
1da177e4 | 455 | |
fe27cb35 | 456 | drv_write(&cmd); |
09b4d1ee | 457 | |
fe27cb35 | 458 | if (acpi_pstate_strict) { |
4d8bb537 | 459 | if (!check_freqs(cmd.mask, freqs.new, data)) { |
fe27cb35 | 460 | dprintk("acpi_cpufreq_target failed (%d)\n", |
64be7eed | 461 | policy->cpu); |
4d8bb537 MT |
462 | result = -EAGAIN; |
463 | goto out; | |
09b4d1ee VP |
464 | } |
465 | } | |
466 | ||
4d8bb537 | 467 | for_each_cpu(i, cmd.mask) { |
fe27cb35 VP |
468 | freqs.cpu = i; |
469 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); | |
470 | } | |
471 | perf->state = next_perf_state; | |
472 | ||
4d8bb537 | 473 | out: |
fe27cb35 | 474 | return result; |
1da177e4 LT |
475 | } |
476 | ||
64be7eed | 477 | static int acpi_cpufreq_verify(struct cpufreq_policy *policy) |
1da177e4 | 478 | { |
ea348f3e | 479 | struct acpi_cpufreq_data *data = per_cpu(drv_data, policy->cpu); |
1da177e4 LT |
480 | |
481 | dprintk("acpi_cpufreq_verify\n"); | |
482 | ||
fe27cb35 | 483 | return cpufreq_frequency_table_verify(policy, data->freq_table); |
1da177e4 LT |
484 | } |
485 | ||
1da177e4 | 486 | static unsigned long |
64be7eed | 487 | acpi_cpufreq_guess_freq(struct acpi_cpufreq_data *data, unsigned int cpu) |
1da177e4 | 488 | { |
64be7eed | 489 | struct acpi_processor_performance *perf = data->acpi_data; |
09b4d1ee | 490 | |
1da177e4 LT |
491 | if (cpu_khz) { |
492 | /* search the closest match to cpu_khz */ | |
493 | unsigned int i; | |
494 | unsigned long freq; | |
09b4d1ee | 495 | unsigned long freqn = perf->states[0].core_frequency * 1000; |
1da177e4 | 496 | |
95dd7227 | 497 | for (i=0; i<(perf->state_count-1); i++) { |
1da177e4 | 498 | freq = freqn; |
95dd7227 | 499 | freqn = perf->states[i+1].core_frequency * 1000; |
1da177e4 | 500 | if ((2 * cpu_khz) > (freqn + freq)) { |
09b4d1ee | 501 | perf->state = i; |
64be7eed | 502 | return freq; |
1da177e4 LT |
503 | } |
504 | } | |
95dd7227 | 505 | perf->state = perf->state_count-1; |
64be7eed | 506 | return freqn; |
09b4d1ee | 507 | } else { |
1da177e4 | 508 | /* assume CPU is at P0... */ |
09b4d1ee VP |
509 | perf->state = 0; |
510 | return perf->states[0].core_frequency * 1000; | |
511 | } | |
1da177e4 LT |
512 | } |
513 | ||
2fdf66b4 RR |
514 | static void free_acpi_perf_data(void) |
515 | { | |
516 | unsigned int i; | |
517 | ||
518 | /* Freeing a NULL pointer is OK, and alloc_percpu zeroes. */ | |
519 | for_each_possible_cpu(i) | |
520 | free_cpumask_var(per_cpu_ptr(acpi_perf_data, i) | |
521 | ->shared_cpu_map); | |
522 | free_percpu(acpi_perf_data); | |
523 | } | |
524 | ||
09b4d1ee VP |
525 | /* |
526 | * acpi_cpufreq_early_init - initialize ACPI P-States library | |
527 | * | |
528 | * Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c) | |
529 | * in order to determine correct frequency and voltage pairings. We can | |
530 | * do _PDC and _PSD and find out the processor dependency for the | |
531 | * actual init that will happen later... | |
532 | */ | |
50109292 | 533 | static int __init acpi_cpufreq_early_init(void) |
09b4d1ee | 534 | { |
2fdf66b4 | 535 | unsigned int i; |
09b4d1ee VP |
536 | dprintk("acpi_cpufreq_early_init\n"); |
537 | ||
50109292 FY |
538 | acpi_perf_data = alloc_percpu(struct acpi_processor_performance); |
539 | if (!acpi_perf_data) { | |
540 | dprintk("Memory allocation error for acpi_perf_data.\n"); | |
541 | return -ENOMEM; | |
09b4d1ee | 542 | } |
2fdf66b4 | 543 | for_each_possible_cpu(i) { |
80855f73 MT |
544 | if (!alloc_cpumask_var_node( |
545 | &per_cpu_ptr(acpi_perf_data, i)->shared_cpu_map, | |
546 | GFP_KERNEL, cpu_to_node(i))) { | |
2fdf66b4 RR |
547 | |
548 | /* Freeing a NULL pointer is OK: alloc_percpu zeroes. */ | |
549 | free_acpi_perf_data(); | |
550 | return -ENOMEM; | |
551 | } | |
552 | } | |
09b4d1ee VP |
553 | |
554 | /* Do initialization in ACPI core */ | |
fe27cb35 VP |
555 | acpi_processor_preregister_performance(acpi_perf_data); |
556 | return 0; | |
09b4d1ee VP |
557 | } |
558 | ||
95625b8f | 559 | #ifdef CONFIG_SMP |
8adcc0c6 VP |
560 | /* |
561 | * Some BIOSes do SW_ANY coordination internally, either set it up in hw | |
562 | * or do it in BIOS firmware and won't inform about it to OS. If not | |
563 | * detected, this has a side effect of making CPU run at a different speed | |
564 | * than OS intended it to run at. Detect it and handle it cleanly. | |
565 | */ | |
566 | static int bios_with_sw_any_bug; | |
567 | ||
1855256c | 568 | static int sw_any_bug_found(const struct dmi_system_id *d) |
8adcc0c6 VP |
569 | { |
570 | bios_with_sw_any_bug = 1; | |
571 | return 0; | |
572 | } | |
573 | ||
1855256c | 574 | static const struct dmi_system_id sw_any_bug_dmi_table[] = { |
8adcc0c6 VP |
575 | { |
576 | .callback = sw_any_bug_found, | |
577 | .ident = "Supermicro Server X6DLP", | |
578 | .matches = { | |
579 | DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"), | |
580 | DMI_MATCH(DMI_BIOS_VERSION, "080010"), | |
581 | DMI_MATCH(DMI_PRODUCT_NAME, "X6DLP"), | |
582 | }, | |
583 | }, | |
584 | { } | |
585 | }; | |
95625b8f | 586 | #endif |
8adcc0c6 | 587 | |
64be7eed | 588 | static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy) |
1da177e4 | 589 | { |
64be7eed VP |
590 | unsigned int i; |
591 | unsigned int valid_states = 0; | |
592 | unsigned int cpu = policy->cpu; | |
593 | struct acpi_cpufreq_data *data; | |
64be7eed | 594 | unsigned int result = 0; |
92cb7612 | 595 | struct cpuinfo_x86 *c = &cpu_data(policy->cpu); |
64be7eed | 596 | struct acpi_processor_performance *perf; |
1da177e4 | 597 | |
1da177e4 | 598 | dprintk("acpi_cpufreq_cpu_init\n"); |
1da177e4 | 599 | |
fe27cb35 | 600 | data = kzalloc(sizeof(struct acpi_cpufreq_data), GFP_KERNEL); |
1da177e4 | 601 | if (!data) |
64be7eed | 602 | return -ENOMEM; |
1da177e4 | 603 | |
50109292 | 604 | data->acpi_data = percpu_ptr(acpi_perf_data, cpu); |
ea348f3e | 605 | per_cpu(drv_data, cpu) = data; |
1da177e4 | 606 | |
95dd7227 | 607 | if (cpu_has(c, X86_FEATURE_CONSTANT_TSC)) |
fe27cb35 | 608 | acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS; |
1da177e4 | 609 | |
fe27cb35 | 610 | result = acpi_processor_register_performance(data->acpi_data, cpu); |
1da177e4 LT |
611 | if (result) |
612 | goto err_free; | |
613 | ||
09b4d1ee | 614 | perf = data->acpi_data; |
09b4d1ee | 615 | policy->shared_type = perf->shared_type; |
95dd7227 | 616 | |
46f18e3a | 617 | /* |
95dd7227 | 618 | * Will let policy->cpus know about dependency only when software |
46f18e3a VP |
619 | * coordination is required. |
620 | */ | |
621 | if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL || | |
8adcc0c6 | 622 | policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) { |
835481d9 | 623 | cpumask_copy(policy->cpus, perf->shared_cpu_map); |
8adcc0c6 | 624 | } |
835481d9 | 625 | cpumask_copy(policy->related_cpus, perf->shared_cpu_map); |
8adcc0c6 VP |
626 | |
627 | #ifdef CONFIG_SMP | |
628 | dmi_check_system(sw_any_bug_dmi_table); | |
835481d9 | 629 | if (bios_with_sw_any_bug && cpumask_weight(policy->cpus) == 1) { |
8adcc0c6 | 630 | policy->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
835481d9 | 631 | cpumask_copy(policy->cpus, cpu_core_mask(cpu)); |
8adcc0c6 VP |
632 | } |
633 | #endif | |
09b4d1ee | 634 | |
1da177e4 | 635 | /* capability check */ |
09b4d1ee | 636 | if (perf->state_count <= 1) { |
1da177e4 LT |
637 | dprintk("No P-States\n"); |
638 | result = -ENODEV; | |
639 | goto err_unreg; | |
640 | } | |
09b4d1ee | 641 | |
fe27cb35 VP |
642 | if (perf->control_register.space_id != perf->status_register.space_id) { |
643 | result = -ENODEV; | |
644 | goto err_unreg; | |
645 | } | |
646 | ||
647 | switch (perf->control_register.space_id) { | |
64be7eed | 648 | case ACPI_ADR_SPACE_SYSTEM_IO: |
fe27cb35 | 649 | dprintk("SYSTEM IO addr space\n"); |
dde9f7ba VP |
650 | data->cpu_feature = SYSTEM_IO_CAPABLE; |
651 | break; | |
64be7eed | 652 | case ACPI_ADR_SPACE_FIXED_HARDWARE: |
dde9f7ba VP |
653 | dprintk("HARDWARE addr space\n"); |
654 | if (!check_est_cpu(cpu)) { | |
655 | result = -ENODEV; | |
656 | goto err_unreg; | |
657 | } | |
658 | data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE; | |
fe27cb35 | 659 | break; |
64be7eed | 660 | default: |
fe27cb35 | 661 | dprintk("Unknown addr space %d\n", |
64be7eed | 662 | (u32) (perf->control_register.space_id)); |
1da177e4 LT |
663 | result = -ENODEV; |
664 | goto err_unreg; | |
665 | } | |
666 | ||
95dd7227 DJ |
667 | data->freq_table = kmalloc(sizeof(struct cpufreq_frequency_table) * |
668 | (perf->state_count+1), GFP_KERNEL); | |
1da177e4 LT |
669 | if (!data->freq_table) { |
670 | result = -ENOMEM; | |
671 | goto err_unreg; | |
672 | } | |
673 | ||
674 | /* detect transition latency */ | |
675 | policy->cpuinfo.transition_latency = 0; | |
95dd7227 | 676 | for (i=0; i<perf->state_count; i++) { |
64be7eed VP |
677 | if ((perf->states[i].transition_latency * 1000) > |
678 | policy->cpuinfo.transition_latency) | |
679 | policy->cpuinfo.transition_latency = | |
680 | perf->states[i].transition_latency * 1000; | |
1da177e4 | 681 | } |
1da177e4 | 682 | |
dfde5d62 | 683 | data->max_freq = perf->states[0].core_frequency * 1000; |
1da177e4 | 684 | /* table init */ |
95dd7227 | 685 | for (i=0; i<perf->state_count; i++) { |
3cdf552b ZR |
686 | if (i>0 && perf->states[i].core_frequency >= |
687 | data->freq_table[valid_states-1].frequency / 1000) | |
fe27cb35 VP |
688 | continue; |
689 | ||
690 | data->freq_table[valid_states].index = i; | |
691 | data->freq_table[valid_states].frequency = | |
64be7eed | 692 | perf->states[i].core_frequency * 1000; |
fe27cb35 | 693 | valid_states++; |
1da177e4 | 694 | } |
3d4a7ef3 | 695 | data->freq_table[valid_states].frequency = CPUFREQ_TABLE_END; |
8edc59d9 | 696 | perf->state = 0; |
1da177e4 LT |
697 | |
698 | result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table); | |
95dd7227 | 699 | if (result) |
1da177e4 | 700 | goto err_freqfree; |
1da177e4 | 701 | |
a507ac4b | 702 | switch (perf->control_register.space_id) { |
64be7eed | 703 | case ACPI_ADR_SPACE_SYSTEM_IO: |
dde9f7ba VP |
704 | /* Current speed is unknown and not detectable by IO port */ |
705 | policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu); | |
706 | break; | |
64be7eed | 707 | case ACPI_ADR_SPACE_FIXED_HARDWARE: |
7650b281 | 708 | acpi_cpufreq_driver.get = get_cur_freq_on_cpu; |
a507ac4b | 709 | policy->cur = get_cur_freq_on_cpu(cpu); |
dde9f7ba | 710 | break; |
64be7eed | 711 | default: |
dde9f7ba VP |
712 | break; |
713 | } | |
714 | ||
1da177e4 LT |
715 | /* notify BIOS that we exist */ |
716 | acpi_processor_notify_smm(THIS_MODULE); | |
717 | ||
dfde5d62 VP |
718 | /* Check for APERF/MPERF support in hardware */ |
719 | if (c->x86_vendor == X86_VENDOR_INTEL && c->cpuid_level >= 6) { | |
720 | unsigned int ecx; | |
721 | ecx = cpuid_ecx(6); | |
95dd7227 | 722 | if (ecx & CPUID_6_ECX_APERFMPERF_CAPABILITY) |
dfde5d62 | 723 | acpi_cpufreq_driver.getavg = get_measured_perf; |
dfde5d62 VP |
724 | } |
725 | ||
fe27cb35 | 726 | dprintk("CPU%u - ACPI performance management activated.\n", cpu); |
09b4d1ee | 727 | for (i = 0; i < perf->state_count; i++) |
1da177e4 | 728 | dprintk(" %cP%d: %d MHz, %d mW, %d uS\n", |
64be7eed | 729 | (i == perf->state ? '*' : ' '), i, |
09b4d1ee VP |
730 | (u32) perf->states[i].core_frequency, |
731 | (u32) perf->states[i].power, | |
732 | (u32) perf->states[i].transition_latency); | |
1da177e4 LT |
733 | |
734 | cpufreq_frequency_table_get_attr(data->freq_table, policy->cpu); | |
64be7eed | 735 | |
4b31e774 DB |
736 | /* |
737 | * the first call to ->target() should result in us actually | |
738 | * writing something to the appropriate registers. | |
739 | */ | |
740 | data->resume = 1; | |
64be7eed | 741 | |
fe27cb35 | 742 | return result; |
1da177e4 | 743 | |
95dd7227 | 744 | err_freqfree: |
1da177e4 | 745 | kfree(data->freq_table); |
95dd7227 | 746 | err_unreg: |
09b4d1ee | 747 | acpi_processor_unregister_performance(perf, cpu); |
95dd7227 | 748 | err_free: |
1da177e4 | 749 | kfree(data); |
ea348f3e | 750 | per_cpu(drv_data, cpu) = NULL; |
1da177e4 | 751 | |
64be7eed | 752 | return result; |
1da177e4 LT |
753 | } |
754 | ||
64be7eed | 755 | static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy) |
1da177e4 | 756 | { |
ea348f3e | 757 | struct acpi_cpufreq_data *data = per_cpu(drv_data, policy->cpu); |
1da177e4 | 758 | |
1da177e4 LT |
759 | dprintk("acpi_cpufreq_cpu_exit\n"); |
760 | ||
761 | if (data) { | |
762 | cpufreq_frequency_table_put_attr(policy->cpu); | |
ea348f3e | 763 | per_cpu(drv_data, policy->cpu) = NULL; |
64be7eed VP |
764 | acpi_processor_unregister_performance(data->acpi_data, |
765 | policy->cpu); | |
1da177e4 LT |
766 | kfree(data); |
767 | } | |
768 | ||
64be7eed | 769 | return 0; |
1da177e4 LT |
770 | } |
771 | ||
64be7eed | 772 | static int acpi_cpufreq_resume(struct cpufreq_policy *policy) |
1da177e4 | 773 | { |
ea348f3e | 774 | struct acpi_cpufreq_data *data = per_cpu(drv_data, policy->cpu); |
1da177e4 | 775 | |
1da177e4 LT |
776 | dprintk("acpi_cpufreq_resume\n"); |
777 | ||
778 | data->resume = 1; | |
779 | ||
64be7eed | 780 | return 0; |
1da177e4 LT |
781 | } |
782 | ||
64be7eed | 783 | static struct freq_attr *acpi_cpufreq_attr[] = { |
1da177e4 LT |
784 | &cpufreq_freq_attr_scaling_available_freqs, |
785 | NULL, | |
786 | }; | |
787 | ||
788 | static struct cpufreq_driver acpi_cpufreq_driver = { | |
64be7eed VP |
789 | .verify = acpi_cpufreq_verify, |
790 | .target = acpi_cpufreq_target, | |
64be7eed VP |
791 | .init = acpi_cpufreq_cpu_init, |
792 | .exit = acpi_cpufreq_cpu_exit, | |
793 | .resume = acpi_cpufreq_resume, | |
794 | .name = "acpi-cpufreq", | |
795 | .owner = THIS_MODULE, | |
796 | .attr = acpi_cpufreq_attr, | |
1da177e4 LT |
797 | }; |
798 | ||
64be7eed | 799 | static int __init acpi_cpufreq_init(void) |
1da177e4 | 800 | { |
50109292 FY |
801 | int ret; |
802 | ||
ee297533 YL |
803 | if (acpi_disabled) |
804 | return 0; | |
805 | ||
1da177e4 LT |
806 | dprintk("acpi_cpufreq_init\n"); |
807 | ||
50109292 FY |
808 | ret = acpi_cpufreq_early_init(); |
809 | if (ret) | |
810 | return ret; | |
09b4d1ee | 811 | |
847aef6f AM |
812 | ret = cpufreq_register_driver(&acpi_cpufreq_driver); |
813 | if (ret) | |
2fdf66b4 | 814 | free_acpi_perf_data(); |
847aef6f AM |
815 | |
816 | return ret; | |
1da177e4 LT |
817 | } |
818 | ||
64be7eed | 819 | static void __exit acpi_cpufreq_exit(void) |
1da177e4 LT |
820 | { |
821 | dprintk("acpi_cpufreq_exit\n"); | |
822 | ||
823 | cpufreq_unregister_driver(&acpi_cpufreq_driver); | |
824 | ||
50109292 | 825 | free_percpu(acpi_perf_data); |
1da177e4 LT |
826 | } |
827 | ||
d395bf12 | 828 | module_param(acpi_pstate_strict, uint, 0644); |
64be7eed | 829 | MODULE_PARM_DESC(acpi_pstate_strict, |
95dd7227 DJ |
830 | "value 0 or non-zero. non-zero -> strict ACPI checks are " |
831 | "performed during frequency changes."); | |
1da177e4 LT |
832 | |
833 | late_initcall(acpi_cpufreq_init); | |
834 | module_exit(acpi_cpufreq_exit); | |
835 | ||
836 | MODULE_ALIAS("acpi"); |