]>
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> |
12922110 | 36 | #include <trace/power.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 | |
3a58df35 DJ |
49 | #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, \ |
50 | "acpi-cpufreq", msg) | |
1da177e4 LT |
51 | |
52 | MODULE_AUTHOR("Paul Diefenbaugh, Dominik Brodowski"); | |
53 | MODULE_DESCRIPTION("ACPI Processor P-States Driver"); | |
54 | MODULE_LICENSE("GPL"); | |
55 | ||
dde9f7ba VP |
56 | enum { |
57 | UNDEFINED_CAPABLE = 0, | |
58 | SYSTEM_INTEL_MSR_CAPABLE, | |
59 | SYSTEM_IO_CAPABLE, | |
60 | }; | |
61 | ||
62 | #define INTEL_MSR_RANGE (0xffff) | |
dfde5d62 | 63 | #define CPUID_6_ECX_APERFMPERF_CAPABILITY (0x1) |
dde9f7ba | 64 | |
fe27cb35 | 65 | struct acpi_cpufreq_data { |
64be7eed VP |
66 | struct acpi_processor_performance *acpi_data; |
67 | struct cpufreq_frequency_table *freq_table; | |
68 | unsigned int resume; | |
69 | unsigned int cpu_feature; | |
1da177e4 LT |
70 | }; |
71 | ||
ea348f3e | 72 | static DEFINE_PER_CPU(struct acpi_cpufreq_data *, drv_data); |
73 | ||
093f13e2 PV |
74 | struct acpi_msr_data { |
75 | u64 saved_aperf, saved_mperf; | |
76 | }; | |
77 | ||
78 | static DEFINE_PER_CPU(struct acpi_msr_data, msr_data); | |
79 | ||
b5f9fd0f JB |
80 | DEFINE_TRACE(power_mark); |
81 | ||
50109292 FY |
82 | /* acpi_perf_data is a pointer to percpu data. */ |
83 | static struct acpi_processor_performance *acpi_perf_data; | |
1da177e4 LT |
84 | |
85 | static struct cpufreq_driver acpi_cpufreq_driver; | |
86 | ||
d395bf12 VP |
87 | static unsigned int acpi_pstate_strict; |
88 | ||
dde9f7ba VP |
89 | static int check_est_cpu(unsigned int cpuid) |
90 | { | |
92cb7612 | 91 | struct cpuinfo_x86 *cpu = &cpu_data(cpuid); |
dde9f7ba VP |
92 | |
93 | if (cpu->x86_vendor != X86_VENDOR_INTEL || | |
64be7eed | 94 | !cpu_has(cpu, X86_FEATURE_EST)) |
dde9f7ba VP |
95 | return 0; |
96 | ||
97 | return 1; | |
98 | } | |
99 | ||
dde9f7ba | 100 | static unsigned extract_io(u32 value, struct acpi_cpufreq_data *data) |
fe27cb35 | 101 | { |
64be7eed VP |
102 | struct acpi_processor_performance *perf; |
103 | int i; | |
fe27cb35 VP |
104 | |
105 | perf = data->acpi_data; | |
106 | ||
3a58df35 | 107 | for (i = 0; i < perf->state_count; i++) { |
fe27cb35 VP |
108 | if (value == perf->states[i].status) |
109 | return data->freq_table[i].frequency; | |
110 | } | |
111 | return 0; | |
112 | } | |
113 | ||
dde9f7ba VP |
114 | static unsigned extract_msr(u32 msr, struct acpi_cpufreq_data *data) |
115 | { | |
116 | int i; | |
a6f6e6e6 | 117 | struct acpi_processor_performance *perf; |
dde9f7ba VP |
118 | |
119 | msr &= INTEL_MSR_RANGE; | |
a6f6e6e6 VP |
120 | perf = data->acpi_data; |
121 | ||
3a58df35 | 122 | for (i = 0; data->freq_table[i].frequency != CPUFREQ_TABLE_END; i++) { |
a6f6e6e6 | 123 | if (msr == perf->states[data->freq_table[i].index].status) |
dde9f7ba VP |
124 | return data->freq_table[i].frequency; |
125 | } | |
126 | return data->freq_table[0].frequency; | |
127 | } | |
128 | ||
dde9f7ba VP |
129 | static unsigned extract_freq(u32 val, struct acpi_cpufreq_data *data) |
130 | { | |
131 | switch (data->cpu_feature) { | |
64be7eed | 132 | case SYSTEM_INTEL_MSR_CAPABLE: |
dde9f7ba | 133 | return extract_msr(val, data); |
64be7eed | 134 | case SYSTEM_IO_CAPABLE: |
dde9f7ba | 135 | return extract_io(val, data); |
64be7eed | 136 | default: |
dde9f7ba VP |
137 | return 0; |
138 | } | |
139 | } | |
140 | ||
dde9f7ba VP |
141 | struct msr_addr { |
142 | u32 reg; | |
143 | }; | |
144 | ||
fe27cb35 VP |
145 | struct io_addr { |
146 | u16 port; | |
147 | u8 bit_width; | |
148 | }; | |
149 | ||
150 | struct drv_cmd { | |
dde9f7ba | 151 | unsigned int type; |
bfa318ad | 152 | const struct cpumask *mask; |
3a58df35 DJ |
153 | union { |
154 | struct msr_addr msr; | |
155 | struct io_addr io; | |
156 | } addr; | |
fe27cb35 VP |
157 | u32 val; |
158 | }; | |
159 | ||
01599fca AM |
160 | /* Called via smp_call_function_single(), on the target CPU */ |
161 | static void do_drv_read(void *_cmd) | |
1da177e4 | 162 | { |
72859081 | 163 | struct drv_cmd *cmd = _cmd; |
dde9f7ba VP |
164 | u32 h; |
165 | ||
166 | switch (cmd->type) { | |
64be7eed | 167 | case SYSTEM_INTEL_MSR_CAPABLE: |
dde9f7ba VP |
168 | rdmsr(cmd->addr.msr.reg, cmd->val, h); |
169 | break; | |
64be7eed | 170 | case SYSTEM_IO_CAPABLE: |
4e581ff1 VP |
171 | acpi_os_read_port((acpi_io_address)cmd->addr.io.port, |
172 | &cmd->val, | |
173 | (u32)cmd->addr.io.bit_width); | |
dde9f7ba | 174 | break; |
64be7eed | 175 | default: |
dde9f7ba VP |
176 | break; |
177 | } | |
fe27cb35 | 178 | } |
1da177e4 | 179 | |
01599fca AM |
180 | /* Called via smp_call_function_many(), on the target CPUs */ |
181 | static void do_drv_write(void *_cmd) | |
fe27cb35 | 182 | { |
72859081 | 183 | struct drv_cmd *cmd = _cmd; |
13424f65 | 184 | u32 lo, hi; |
dde9f7ba VP |
185 | |
186 | switch (cmd->type) { | |
64be7eed | 187 | case SYSTEM_INTEL_MSR_CAPABLE: |
13424f65 VP |
188 | rdmsr(cmd->addr.msr.reg, lo, hi); |
189 | lo = (lo & ~INTEL_MSR_RANGE) | (cmd->val & INTEL_MSR_RANGE); | |
190 | wrmsr(cmd->addr.msr.reg, lo, hi); | |
dde9f7ba | 191 | break; |
64be7eed | 192 | case SYSTEM_IO_CAPABLE: |
4e581ff1 VP |
193 | acpi_os_write_port((acpi_io_address)cmd->addr.io.port, |
194 | cmd->val, | |
195 | (u32)cmd->addr.io.bit_width); | |
dde9f7ba | 196 | break; |
64be7eed | 197 | default: |
dde9f7ba VP |
198 | break; |
199 | } | |
fe27cb35 | 200 | } |
1da177e4 | 201 | |
95dd7227 | 202 | static void drv_read(struct drv_cmd *cmd) |
fe27cb35 | 203 | { |
fe27cb35 VP |
204 | cmd->val = 0; |
205 | ||
01599fca | 206 | smp_call_function_single(cpumask_any(cmd->mask), do_drv_read, cmd, 1); |
fe27cb35 VP |
207 | } |
208 | ||
209 | static void drv_write(struct drv_cmd *cmd) | |
210 | { | |
ea34f43a LT |
211 | int this_cpu; |
212 | ||
213 | this_cpu = get_cpu(); | |
214 | if (cpumask_test_cpu(this_cpu, cmd->mask)) | |
215 | do_drv_write(cmd); | |
01599fca | 216 | smp_call_function_many(cmd->mask, do_drv_write, cmd, 1); |
ea34f43a | 217 | put_cpu(); |
fe27cb35 | 218 | } |
1da177e4 | 219 | |
4d8bb537 | 220 | static u32 get_cur_val(const struct cpumask *mask) |
fe27cb35 | 221 | { |
64be7eed VP |
222 | struct acpi_processor_performance *perf; |
223 | struct drv_cmd cmd; | |
1da177e4 | 224 | |
4d8bb537 | 225 | if (unlikely(cpumask_empty(mask))) |
fe27cb35 | 226 | return 0; |
1da177e4 | 227 | |
4d8bb537 | 228 | switch (per_cpu(drv_data, cpumask_first(mask))->cpu_feature) { |
dde9f7ba VP |
229 | case SYSTEM_INTEL_MSR_CAPABLE: |
230 | cmd.type = SYSTEM_INTEL_MSR_CAPABLE; | |
231 | cmd.addr.msr.reg = MSR_IA32_PERF_STATUS; | |
232 | break; | |
233 | case SYSTEM_IO_CAPABLE: | |
234 | cmd.type = SYSTEM_IO_CAPABLE; | |
4d8bb537 | 235 | perf = per_cpu(drv_data, cpumask_first(mask))->acpi_data; |
dde9f7ba VP |
236 | cmd.addr.io.port = perf->control_register.address; |
237 | cmd.addr.io.bit_width = perf->control_register.bit_width; | |
238 | break; | |
239 | default: | |
240 | return 0; | |
241 | } | |
242 | ||
bfa318ad | 243 | cmd.mask = mask; |
fe27cb35 | 244 | drv_read(&cmd); |
1da177e4 | 245 | |
fe27cb35 VP |
246 | dprintk("get_cur_val = %u\n", cmd.val); |
247 | ||
248 | return cmd.val; | |
249 | } | |
1da177e4 | 250 | |
e4f69372 | 251 | struct perf_pair { |
e39ad415 MT |
252 | union { |
253 | struct { | |
254 | u32 lo; | |
255 | u32 hi; | |
256 | } split; | |
257 | u64 whole; | |
e4f69372 | 258 | } aperf, mperf; |
e39ad415 MT |
259 | }; |
260 | ||
01599fca AM |
261 | /* Called via smp_call_function_single(), on the target CPU */ |
262 | static void read_measured_perf_ctrs(void *_cur) | |
e39ad415 | 263 | { |
e4f69372 | 264 | struct perf_pair *cur = _cur; |
e39ad415 | 265 | |
e4f69372 VP |
266 | rdmsr(MSR_IA32_APERF, cur->aperf.split.lo, cur->aperf.split.hi); |
267 | rdmsr(MSR_IA32_MPERF, cur->mperf.split.lo, cur->mperf.split.hi); | |
e39ad415 MT |
268 | } |
269 | ||
dfde5d62 VP |
270 | /* |
271 | * Return the measured active (C0) frequency on this CPU since last call | |
272 | * to this function. | |
273 | * Input: cpu number | |
274 | * Return: Average CPU frequency in terms of max frequency (zero on error) | |
275 | * | |
276 | * We use IA32_MPERF and IA32_APERF MSRs to get the measured performance | |
277 | * over a period of time, while CPU is in C0 state. | |
278 | * IA32_MPERF counts at the rate of max advertised frequency | |
279 | * IA32_APERF counts at the rate of actual CPU frequency | |
280 | * Only IA32_APERF/IA32_MPERF ratio is architecturally defined and | |
281 | * no meaning should be associated with absolute values of these MSRs. | |
282 | */ | |
bf0b90e3 | 283 | static unsigned int get_measured_perf(struct cpufreq_policy *policy, |
284 | unsigned int cpu) | |
dfde5d62 | 285 | { |
18b2646f | 286 | struct perf_pair readin, cur; |
dfde5d62 VP |
287 | unsigned int perf_percent; |
288 | unsigned int retval; | |
289 | ||
1c98aa74 | 290 | if (smp_call_function_single(cpu, read_measured_perf_ctrs, &readin, 1)) |
dfde5d62 | 291 | return 0; |
dfde5d62 | 292 | |
18b2646f | 293 | cur.aperf.whole = readin.aperf.whole - |
093f13e2 | 294 | per_cpu(msr_data, cpu).saved_aperf; |
18b2646f | 295 | cur.mperf.whole = readin.mperf.whole - |
093f13e2 PV |
296 | per_cpu(msr_data, cpu).saved_mperf; |
297 | per_cpu(msr_data, cpu).saved_aperf = readin.aperf.whole; | |
298 | per_cpu(msr_data, cpu).saved_mperf = readin.mperf.whole; | |
18b2646f | 299 | |
dfde5d62 VP |
300 | #ifdef __i386__ |
301 | /* | |
302 | * We dont want to do 64 bit divide with 32 bit kernel | |
303 | * Get an approximate value. Return failure in case we cannot get | |
304 | * an approximate value. | |
305 | */ | |
e4f69372 | 306 | if (unlikely(cur.aperf.split.hi || cur.mperf.split.hi)) { |
dfde5d62 VP |
307 | int shift_count; |
308 | u32 h; | |
309 | ||
e4f69372 | 310 | h = max_t(u32, cur.aperf.split.hi, cur.mperf.split.hi); |
dfde5d62 VP |
311 | shift_count = fls(h); |
312 | ||
e4f69372 VP |
313 | cur.aperf.whole >>= shift_count; |
314 | cur.mperf.whole >>= shift_count; | |
dfde5d62 VP |
315 | } |
316 | ||
e4f69372 | 317 | if (((unsigned long)(-1) / 100) < cur.aperf.split.lo) { |
dfde5d62 | 318 | int shift_count = 7; |
e4f69372 VP |
319 | cur.aperf.split.lo >>= shift_count; |
320 | cur.mperf.split.lo >>= shift_count; | |
dfde5d62 VP |
321 | } |
322 | ||
e4f69372 VP |
323 | if (cur.aperf.split.lo && cur.mperf.split.lo) |
324 | perf_percent = (cur.aperf.split.lo * 100) / cur.mperf.split.lo; | |
95dd7227 | 325 | else |
dfde5d62 | 326 | perf_percent = 0; |
dfde5d62 VP |
327 | |
328 | #else | |
e4f69372 | 329 | if (unlikely(((unsigned long)(-1) / 100) < cur.aperf.whole)) { |
dfde5d62 | 330 | int shift_count = 7; |
e4f69372 VP |
331 | cur.aperf.whole >>= shift_count; |
332 | cur.mperf.whole >>= shift_count; | |
dfde5d62 VP |
333 | } |
334 | ||
e4f69372 VP |
335 | if (cur.aperf.whole && cur.mperf.whole) |
336 | perf_percent = (cur.aperf.whole * 100) / cur.mperf.whole; | |
95dd7227 | 337 | else |
dfde5d62 | 338 | perf_percent = 0; |
dfde5d62 VP |
339 | |
340 | #endif | |
341 | ||
d876dfbb | 342 | retval = (policy->cpuinfo.max_freq * perf_percent) / 100; |
dfde5d62 | 343 | |
dfde5d62 VP |
344 | return retval; |
345 | } | |
346 | ||
fe27cb35 VP |
347 | static unsigned int get_cur_freq_on_cpu(unsigned int cpu) |
348 | { | |
ea348f3e | 349 | struct acpi_cpufreq_data *data = per_cpu(drv_data, cpu); |
64be7eed | 350 | unsigned int freq; |
e56a727b | 351 | unsigned int cached_freq; |
fe27cb35 VP |
352 | |
353 | dprintk("get_cur_freq_on_cpu (%d)\n", cpu); | |
354 | ||
355 | if (unlikely(data == NULL || | |
64be7eed | 356 | data->acpi_data == NULL || data->freq_table == NULL)) { |
fe27cb35 | 357 | return 0; |
1da177e4 LT |
358 | } |
359 | ||
e56a727b | 360 | cached_freq = data->freq_table[data->acpi_data->state].frequency; |
e39ad415 | 361 | freq = extract_freq(get_cur_val(cpumask_of(cpu)), data); |
e56a727b VP |
362 | if (freq != cached_freq) { |
363 | /* | |
364 | * The dreaded BIOS frequency change behind our back. | |
365 | * Force set the frequency on next target call. | |
366 | */ | |
367 | data->resume = 1; | |
368 | } | |
369 | ||
fe27cb35 | 370 | dprintk("cur freq = %u\n", freq); |
1da177e4 | 371 | |
fe27cb35 | 372 | return freq; |
1da177e4 LT |
373 | } |
374 | ||
72859081 | 375 | static unsigned int check_freqs(const struct cpumask *mask, unsigned int freq, |
64be7eed | 376 | struct acpi_cpufreq_data *data) |
fe27cb35 | 377 | { |
64be7eed VP |
378 | unsigned int cur_freq; |
379 | unsigned int i; | |
1da177e4 | 380 | |
3a58df35 | 381 | for (i = 0; i < 100; i++) { |
fe27cb35 VP |
382 | cur_freq = extract_freq(get_cur_val(mask), data); |
383 | if (cur_freq == freq) | |
384 | return 1; | |
385 | udelay(10); | |
386 | } | |
387 | return 0; | |
388 | } | |
389 | ||
390 | static int acpi_cpufreq_target(struct cpufreq_policy *policy, | |
64be7eed | 391 | unsigned int target_freq, unsigned int relation) |
1da177e4 | 392 | { |
ea348f3e | 393 | struct acpi_cpufreq_data *data = per_cpu(drv_data, policy->cpu); |
64be7eed VP |
394 | struct acpi_processor_performance *perf; |
395 | struct cpufreq_freqs freqs; | |
64be7eed | 396 | struct drv_cmd cmd; |
8edc59d9 VP |
397 | unsigned int next_state = 0; /* Index into freq_table */ |
398 | unsigned int next_perf_state = 0; /* Index into perf table */ | |
64be7eed VP |
399 | unsigned int i; |
400 | int result = 0; | |
f3f47a67 | 401 | struct power_trace it; |
fe27cb35 VP |
402 | |
403 | dprintk("acpi_cpufreq_target %d (%d)\n", target_freq, policy->cpu); | |
404 | ||
405 | if (unlikely(data == NULL || | |
95dd7227 | 406 | data->acpi_data == NULL || data->freq_table == NULL)) { |
fe27cb35 VP |
407 | return -ENODEV; |
408 | } | |
1da177e4 | 409 | |
fe27cb35 | 410 | perf = data->acpi_data; |
1da177e4 | 411 | result = cpufreq_frequency_table_target(policy, |
64be7eed VP |
412 | data->freq_table, |
413 | target_freq, | |
414 | relation, &next_state); | |
4d8bb537 MT |
415 | if (unlikely(result)) { |
416 | result = -ENODEV; | |
417 | goto out; | |
418 | } | |
1da177e4 | 419 | |
fe27cb35 | 420 | next_perf_state = data->freq_table[next_state].index; |
7650b281 | 421 | if (perf->state == next_perf_state) { |
fe27cb35 | 422 | if (unlikely(data->resume)) { |
64be7eed VP |
423 | dprintk("Called after resume, resetting to P%d\n", |
424 | next_perf_state); | |
fe27cb35 VP |
425 | data->resume = 0; |
426 | } else { | |
64be7eed VP |
427 | dprintk("Already at target state (P%d)\n", |
428 | next_perf_state); | |
4d8bb537 | 429 | goto out; |
fe27cb35 | 430 | } |
09b4d1ee VP |
431 | } |
432 | ||
f3f47a67 AV |
433 | trace_power_mark(&it, POWER_PSTATE, next_perf_state); |
434 | ||
64be7eed VP |
435 | switch (data->cpu_feature) { |
436 | case SYSTEM_INTEL_MSR_CAPABLE: | |
437 | cmd.type = SYSTEM_INTEL_MSR_CAPABLE; | |
438 | cmd.addr.msr.reg = MSR_IA32_PERF_CTL; | |
13424f65 | 439 | cmd.val = (u32) perf->states[next_perf_state].control; |
64be7eed VP |
440 | break; |
441 | case SYSTEM_IO_CAPABLE: | |
442 | cmd.type = SYSTEM_IO_CAPABLE; | |
443 | cmd.addr.io.port = perf->control_register.address; | |
444 | cmd.addr.io.bit_width = perf->control_register.bit_width; | |
445 | cmd.val = (u32) perf->states[next_perf_state].control; | |
446 | break; | |
447 | default: | |
4d8bb537 MT |
448 | result = -ENODEV; |
449 | goto out; | |
64be7eed | 450 | } |
09b4d1ee | 451 | |
4d8bb537 | 452 | /* cpufreq holds the hotplug lock, so we are safe from here on */ |
fe27cb35 | 453 | if (policy->shared_type != CPUFREQ_SHARED_TYPE_ANY) |
bfa318ad | 454 | cmd.mask = policy->cpus; |
fe27cb35 | 455 | else |
bfa318ad | 456 | cmd.mask = cpumask_of(policy->cpu); |
09b4d1ee | 457 | |
8edc59d9 VP |
458 | freqs.old = perf->states[perf->state].core_frequency * 1000; |
459 | freqs.new = data->freq_table[next_state].frequency; | |
4d8bb537 | 460 | for_each_cpu(i, cmd.mask) { |
fe27cb35 VP |
461 | freqs.cpu = i; |
462 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); | |
09b4d1ee | 463 | } |
1da177e4 | 464 | |
fe27cb35 | 465 | drv_write(&cmd); |
09b4d1ee | 466 | |
fe27cb35 | 467 | if (acpi_pstate_strict) { |
4d8bb537 | 468 | if (!check_freqs(cmd.mask, freqs.new, data)) { |
fe27cb35 | 469 | dprintk("acpi_cpufreq_target failed (%d)\n", |
64be7eed | 470 | policy->cpu); |
4d8bb537 MT |
471 | result = -EAGAIN; |
472 | goto out; | |
09b4d1ee VP |
473 | } |
474 | } | |
475 | ||
4d8bb537 | 476 | for_each_cpu(i, cmd.mask) { |
fe27cb35 VP |
477 | freqs.cpu = i; |
478 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); | |
479 | } | |
480 | perf->state = next_perf_state; | |
481 | ||
4d8bb537 | 482 | out: |
fe27cb35 | 483 | return result; |
1da177e4 LT |
484 | } |
485 | ||
64be7eed | 486 | static int acpi_cpufreq_verify(struct cpufreq_policy *policy) |
1da177e4 | 487 | { |
ea348f3e | 488 | struct acpi_cpufreq_data *data = per_cpu(drv_data, policy->cpu); |
1da177e4 LT |
489 | |
490 | dprintk("acpi_cpufreq_verify\n"); | |
491 | ||
fe27cb35 | 492 | return cpufreq_frequency_table_verify(policy, data->freq_table); |
1da177e4 LT |
493 | } |
494 | ||
1da177e4 | 495 | static unsigned long |
64be7eed | 496 | acpi_cpufreq_guess_freq(struct acpi_cpufreq_data *data, unsigned int cpu) |
1da177e4 | 497 | { |
64be7eed | 498 | struct acpi_processor_performance *perf = data->acpi_data; |
09b4d1ee | 499 | |
1da177e4 LT |
500 | if (cpu_khz) { |
501 | /* search the closest match to cpu_khz */ | |
502 | unsigned int i; | |
503 | unsigned long freq; | |
09b4d1ee | 504 | unsigned long freqn = perf->states[0].core_frequency * 1000; |
1da177e4 | 505 | |
3a58df35 | 506 | for (i = 0; i < (perf->state_count-1); i++) { |
1da177e4 | 507 | freq = freqn; |
95dd7227 | 508 | freqn = perf->states[i+1].core_frequency * 1000; |
1da177e4 | 509 | if ((2 * cpu_khz) > (freqn + freq)) { |
09b4d1ee | 510 | perf->state = i; |
64be7eed | 511 | return freq; |
1da177e4 LT |
512 | } |
513 | } | |
95dd7227 | 514 | perf->state = perf->state_count-1; |
64be7eed | 515 | return freqn; |
09b4d1ee | 516 | } else { |
1da177e4 | 517 | /* assume CPU is at P0... */ |
09b4d1ee VP |
518 | perf->state = 0; |
519 | return perf->states[0].core_frequency * 1000; | |
520 | } | |
1da177e4 LT |
521 | } |
522 | ||
2fdf66b4 RR |
523 | static void free_acpi_perf_data(void) |
524 | { | |
525 | unsigned int i; | |
526 | ||
527 | /* Freeing a NULL pointer is OK, and alloc_percpu zeroes. */ | |
528 | for_each_possible_cpu(i) | |
529 | free_cpumask_var(per_cpu_ptr(acpi_perf_data, i) | |
530 | ->shared_cpu_map); | |
531 | free_percpu(acpi_perf_data); | |
532 | } | |
533 | ||
09b4d1ee VP |
534 | /* |
535 | * acpi_cpufreq_early_init - initialize ACPI P-States library | |
536 | * | |
537 | * Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c) | |
538 | * in order to determine correct frequency and voltage pairings. We can | |
539 | * do _PDC and _PSD and find out the processor dependency for the | |
540 | * actual init that will happen later... | |
541 | */ | |
50109292 | 542 | static int __init acpi_cpufreq_early_init(void) |
09b4d1ee | 543 | { |
2fdf66b4 | 544 | unsigned int i; |
09b4d1ee VP |
545 | dprintk("acpi_cpufreq_early_init\n"); |
546 | ||
50109292 FY |
547 | acpi_perf_data = alloc_percpu(struct acpi_processor_performance); |
548 | if (!acpi_perf_data) { | |
549 | dprintk("Memory allocation error for acpi_perf_data.\n"); | |
550 | return -ENOMEM; | |
09b4d1ee | 551 | } |
2fdf66b4 | 552 | for_each_possible_cpu(i) { |
eaa95840 | 553 | if (!zalloc_cpumask_var_node( |
80855f73 MT |
554 | &per_cpu_ptr(acpi_perf_data, i)->shared_cpu_map, |
555 | GFP_KERNEL, cpu_to_node(i))) { | |
2fdf66b4 RR |
556 | |
557 | /* Freeing a NULL pointer is OK: alloc_percpu zeroes. */ | |
558 | free_acpi_perf_data(); | |
559 | return -ENOMEM; | |
560 | } | |
561 | } | |
09b4d1ee VP |
562 | |
563 | /* Do initialization in ACPI core */ | |
fe27cb35 VP |
564 | acpi_processor_preregister_performance(acpi_perf_data); |
565 | return 0; | |
09b4d1ee VP |
566 | } |
567 | ||
95625b8f | 568 | #ifdef CONFIG_SMP |
8adcc0c6 VP |
569 | /* |
570 | * Some BIOSes do SW_ANY coordination internally, either set it up in hw | |
571 | * or do it in BIOS firmware and won't inform about it to OS. If not | |
572 | * detected, this has a side effect of making CPU run at a different speed | |
573 | * than OS intended it to run at. Detect it and handle it cleanly. | |
574 | */ | |
575 | static int bios_with_sw_any_bug; | |
576 | ||
1855256c | 577 | static int sw_any_bug_found(const struct dmi_system_id *d) |
8adcc0c6 VP |
578 | { |
579 | bios_with_sw_any_bug = 1; | |
580 | return 0; | |
581 | } | |
582 | ||
1855256c | 583 | static const struct dmi_system_id sw_any_bug_dmi_table[] = { |
8adcc0c6 VP |
584 | { |
585 | .callback = sw_any_bug_found, | |
586 | .ident = "Supermicro Server X6DLP", | |
587 | .matches = { | |
588 | DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"), | |
589 | DMI_MATCH(DMI_BIOS_VERSION, "080010"), | |
590 | DMI_MATCH(DMI_PRODUCT_NAME, "X6DLP"), | |
591 | }, | |
592 | }, | |
593 | { } | |
594 | }; | |
95625b8f | 595 | #endif |
8adcc0c6 | 596 | |
64be7eed | 597 | static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy) |
1da177e4 | 598 | { |
64be7eed VP |
599 | unsigned int i; |
600 | unsigned int valid_states = 0; | |
601 | unsigned int cpu = policy->cpu; | |
602 | struct acpi_cpufreq_data *data; | |
64be7eed | 603 | unsigned int result = 0; |
92cb7612 | 604 | struct cpuinfo_x86 *c = &cpu_data(policy->cpu); |
64be7eed | 605 | struct acpi_processor_performance *perf; |
1da177e4 | 606 | |
1da177e4 | 607 | dprintk("acpi_cpufreq_cpu_init\n"); |
1da177e4 | 608 | |
fe27cb35 | 609 | data = kzalloc(sizeof(struct acpi_cpufreq_data), GFP_KERNEL); |
1da177e4 | 610 | if (!data) |
64be7eed | 611 | return -ENOMEM; |
1da177e4 | 612 | |
b36128c8 | 613 | data->acpi_data = per_cpu_ptr(acpi_perf_data, cpu); |
ea348f3e | 614 | per_cpu(drv_data, cpu) = data; |
1da177e4 | 615 | |
95dd7227 | 616 | if (cpu_has(c, X86_FEATURE_CONSTANT_TSC)) |
fe27cb35 | 617 | acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS; |
1da177e4 | 618 | |
fe27cb35 | 619 | result = acpi_processor_register_performance(data->acpi_data, cpu); |
1da177e4 LT |
620 | if (result) |
621 | goto err_free; | |
622 | ||
09b4d1ee | 623 | perf = data->acpi_data; |
09b4d1ee | 624 | policy->shared_type = perf->shared_type; |
95dd7227 | 625 | |
46f18e3a | 626 | /* |
95dd7227 | 627 | * Will let policy->cpus know about dependency only when software |
46f18e3a VP |
628 | * coordination is required. |
629 | */ | |
630 | if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL || | |
8adcc0c6 | 631 | policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) { |
835481d9 | 632 | cpumask_copy(policy->cpus, perf->shared_cpu_map); |
8adcc0c6 | 633 | } |
835481d9 | 634 | cpumask_copy(policy->related_cpus, perf->shared_cpu_map); |
8adcc0c6 VP |
635 | |
636 | #ifdef CONFIG_SMP | |
637 | dmi_check_system(sw_any_bug_dmi_table); | |
835481d9 | 638 | if (bios_with_sw_any_bug && cpumask_weight(policy->cpus) == 1) { |
8adcc0c6 | 639 | policy->shared_type = CPUFREQ_SHARED_TYPE_ALL; |
835481d9 | 640 | cpumask_copy(policy->cpus, cpu_core_mask(cpu)); |
8adcc0c6 VP |
641 | } |
642 | #endif | |
09b4d1ee | 643 | |
1da177e4 | 644 | /* capability check */ |
09b4d1ee | 645 | if (perf->state_count <= 1) { |
1da177e4 LT |
646 | dprintk("No P-States\n"); |
647 | result = -ENODEV; | |
648 | goto err_unreg; | |
649 | } | |
09b4d1ee | 650 | |
fe27cb35 VP |
651 | if (perf->control_register.space_id != perf->status_register.space_id) { |
652 | result = -ENODEV; | |
653 | goto err_unreg; | |
654 | } | |
655 | ||
656 | switch (perf->control_register.space_id) { | |
64be7eed | 657 | case ACPI_ADR_SPACE_SYSTEM_IO: |
fe27cb35 | 658 | dprintk("SYSTEM IO addr space\n"); |
dde9f7ba VP |
659 | data->cpu_feature = SYSTEM_IO_CAPABLE; |
660 | break; | |
64be7eed | 661 | case ACPI_ADR_SPACE_FIXED_HARDWARE: |
dde9f7ba VP |
662 | dprintk("HARDWARE addr space\n"); |
663 | if (!check_est_cpu(cpu)) { | |
664 | result = -ENODEV; | |
665 | goto err_unreg; | |
666 | } | |
667 | data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE; | |
fe27cb35 | 668 | break; |
64be7eed | 669 | default: |
fe27cb35 | 670 | dprintk("Unknown addr space %d\n", |
64be7eed | 671 | (u32) (perf->control_register.space_id)); |
1da177e4 LT |
672 | result = -ENODEV; |
673 | goto err_unreg; | |
674 | } | |
675 | ||
95dd7227 DJ |
676 | data->freq_table = kmalloc(sizeof(struct cpufreq_frequency_table) * |
677 | (perf->state_count+1), GFP_KERNEL); | |
1da177e4 LT |
678 | if (!data->freq_table) { |
679 | result = -ENOMEM; | |
680 | goto err_unreg; | |
681 | } | |
682 | ||
683 | /* detect transition latency */ | |
684 | policy->cpuinfo.transition_latency = 0; | |
3a58df35 | 685 | for (i = 0; i < perf->state_count; i++) { |
64be7eed VP |
686 | if ((perf->states[i].transition_latency * 1000) > |
687 | policy->cpuinfo.transition_latency) | |
688 | policy->cpuinfo.transition_latency = | |
689 | perf->states[i].transition_latency * 1000; | |
1da177e4 | 690 | } |
1da177e4 | 691 | |
a59d1637 PV |
692 | /* Check for high latency (>20uS) from buggy BIOSes, like on T42 */ |
693 | if (perf->control_register.space_id == ACPI_ADR_SPACE_FIXED_HARDWARE && | |
694 | policy->cpuinfo.transition_latency > 20 * 1000) { | |
a59d1637 | 695 | policy->cpuinfo.transition_latency = 20 * 1000; |
61c8c67e JP |
696 | printk_once(KERN_INFO |
697 | "P-state transition latency capped at 20 uS\n"); | |
a59d1637 PV |
698 | } |
699 | ||
1da177e4 | 700 | /* table init */ |
3a58df35 DJ |
701 | for (i = 0; i < perf->state_count; i++) { |
702 | if (i > 0 && perf->states[i].core_frequency >= | |
3cdf552b | 703 | data->freq_table[valid_states-1].frequency / 1000) |
fe27cb35 VP |
704 | continue; |
705 | ||
706 | data->freq_table[valid_states].index = i; | |
707 | data->freq_table[valid_states].frequency = | |
64be7eed | 708 | perf->states[i].core_frequency * 1000; |
fe27cb35 | 709 | valid_states++; |
1da177e4 | 710 | } |
3d4a7ef3 | 711 | data->freq_table[valid_states].frequency = CPUFREQ_TABLE_END; |
8edc59d9 | 712 | perf->state = 0; |
1da177e4 LT |
713 | |
714 | result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table); | |
95dd7227 | 715 | if (result) |
1da177e4 | 716 | goto err_freqfree; |
1da177e4 | 717 | |
d876dfbb TR |
718 | if (perf->states[0].core_frequency * 1000 != policy->cpuinfo.max_freq) |
719 | printk(KERN_WARNING FW_WARN "P-state 0 is not max freq\n"); | |
720 | ||
a507ac4b | 721 | switch (perf->control_register.space_id) { |
64be7eed | 722 | case ACPI_ADR_SPACE_SYSTEM_IO: |
dde9f7ba VP |
723 | /* Current speed is unknown and not detectable by IO port */ |
724 | policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu); | |
725 | break; | |
64be7eed | 726 | case ACPI_ADR_SPACE_FIXED_HARDWARE: |
7650b281 | 727 | acpi_cpufreq_driver.get = get_cur_freq_on_cpu; |
a507ac4b | 728 | policy->cur = get_cur_freq_on_cpu(cpu); |
dde9f7ba | 729 | break; |
64be7eed | 730 | default: |
dde9f7ba VP |
731 | break; |
732 | } | |
733 | ||
1da177e4 LT |
734 | /* notify BIOS that we exist */ |
735 | acpi_processor_notify_smm(THIS_MODULE); | |
736 | ||
dfde5d62 VP |
737 | /* Check for APERF/MPERF support in hardware */ |
738 | if (c->x86_vendor == X86_VENDOR_INTEL && c->cpuid_level >= 6) { | |
739 | unsigned int ecx; | |
740 | ecx = cpuid_ecx(6); | |
95dd7227 | 741 | if (ecx & CPUID_6_ECX_APERFMPERF_CAPABILITY) |
dfde5d62 | 742 | acpi_cpufreq_driver.getavg = get_measured_perf; |
dfde5d62 VP |
743 | } |
744 | ||
fe27cb35 | 745 | dprintk("CPU%u - ACPI performance management activated.\n", cpu); |
09b4d1ee | 746 | for (i = 0; i < perf->state_count; i++) |
1da177e4 | 747 | dprintk(" %cP%d: %d MHz, %d mW, %d uS\n", |
64be7eed | 748 | (i == perf->state ? '*' : ' '), i, |
09b4d1ee VP |
749 | (u32) perf->states[i].core_frequency, |
750 | (u32) perf->states[i].power, | |
751 | (u32) perf->states[i].transition_latency); | |
1da177e4 LT |
752 | |
753 | cpufreq_frequency_table_get_attr(data->freq_table, policy->cpu); | |
64be7eed | 754 | |
4b31e774 DB |
755 | /* |
756 | * the first call to ->target() should result in us actually | |
757 | * writing something to the appropriate registers. | |
758 | */ | |
759 | data->resume = 1; | |
64be7eed | 760 | |
fe27cb35 | 761 | return result; |
1da177e4 | 762 | |
95dd7227 | 763 | err_freqfree: |
1da177e4 | 764 | kfree(data->freq_table); |
95dd7227 | 765 | err_unreg: |
09b4d1ee | 766 | acpi_processor_unregister_performance(perf, cpu); |
95dd7227 | 767 | err_free: |
1da177e4 | 768 | kfree(data); |
ea348f3e | 769 | per_cpu(drv_data, cpu) = NULL; |
1da177e4 | 770 | |
64be7eed | 771 | return result; |
1da177e4 LT |
772 | } |
773 | ||
64be7eed | 774 | static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy) |
1da177e4 | 775 | { |
ea348f3e | 776 | struct acpi_cpufreq_data *data = per_cpu(drv_data, policy->cpu); |
1da177e4 | 777 | |
1da177e4 LT |
778 | dprintk("acpi_cpufreq_cpu_exit\n"); |
779 | ||
780 | if (data) { | |
781 | cpufreq_frequency_table_put_attr(policy->cpu); | |
ea348f3e | 782 | per_cpu(drv_data, policy->cpu) = NULL; |
64be7eed VP |
783 | acpi_processor_unregister_performance(data->acpi_data, |
784 | policy->cpu); | |
1da177e4 LT |
785 | kfree(data); |
786 | } | |
787 | ||
64be7eed | 788 | return 0; |
1da177e4 LT |
789 | } |
790 | ||
64be7eed | 791 | static int acpi_cpufreq_resume(struct cpufreq_policy *policy) |
1da177e4 | 792 | { |
ea348f3e | 793 | struct acpi_cpufreq_data *data = per_cpu(drv_data, policy->cpu); |
1da177e4 | 794 | |
1da177e4 LT |
795 | dprintk("acpi_cpufreq_resume\n"); |
796 | ||
797 | data->resume = 1; | |
798 | ||
64be7eed | 799 | return 0; |
1da177e4 LT |
800 | } |
801 | ||
64be7eed | 802 | static struct freq_attr *acpi_cpufreq_attr[] = { |
1da177e4 LT |
803 | &cpufreq_freq_attr_scaling_available_freqs, |
804 | NULL, | |
805 | }; | |
806 | ||
807 | static struct cpufreq_driver acpi_cpufreq_driver = { | |
64be7eed VP |
808 | .verify = acpi_cpufreq_verify, |
809 | .target = acpi_cpufreq_target, | |
64be7eed VP |
810 | .init = acpi_cpufreq_cpu_init, |
811 | .exit = acpi_cpufreq_cpu_exit, | |
812 | .resume = acpi_cpufreq_resume, | |
813 | .name = "acpi-cpufreq", | |
814 | .owner = THIS_MODULE, | |
815 | .attr = acpi_cpufreq_attr, | |
1da177e4 LT |
816 | }; |
817 | ||
64be7eed | 818 | static int __init acpi_cpufreq_init(void) |
1da177e4 | 819 | { |
50109292 FY |
820 | int ret; |
821 | ||
ee297533 YL |
822 | if (acpi_disabled) |
823 | return 0; | |
824 | ||
1da177e4 LT |
825 | dprintk("acpi_cpufreq_init\n"); |
826 | ||
50109292 FY |
827 | ret = acpi_cpufreq_early_init(); |
828 | if (ret) | |
829 | return ret; | |
09b4d1ee | 830 | |
847aef6f AM |
831 | ret = cpufreq_register_driver(&acpi_cpufreq_driver); |
832 | if (ret) | |
2fdf66b4 | 833 | free_acpi_perf_data(); |
847aef6f AM |
834 | |
835 | return ret; | |
1da177e4 LT |
836 | } |
837 | ||
64be7eed | 838 | static void __exit acpi_cpufreq_exit(void) |
1da177e4 LT |
839 | { |
840 | dprintk("acpi_cpufreq_exit\n"); | |
841 | ||
842 | cpufreq_unregister_driver(&acpi_cpufreq_driver); | |
843 | ||
50109292 | 844 | free_percpu(acpi_perf_data); |
1da177e4 LT |
845 | } |
846 | ||
d395bf12 | 847 | module_param(acpi_pstate_strict, uint, 0644); |
64be7eed | 848 | MODULE_PARM_DESC(acpi_pstate_strict, |
95dd7227 DJ |
849 | "value 0 or non-zero. non-zero -> strict ACPI checks are " |
850 | "performed during frequency changes."); | |
1da177e4 LT |
851 | |
852 | late_initcall(acpi_cpufreq_init); | |
853 | module_exit(acpi_cpufreq_exit); | |
854 | ||
855 | MODULE_ALIAS("acpi"); |