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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> |
1da177e4 LT |
36 | |
37 | #include <linux/acpi.h> | |
38 | #include <acpi/processor.h> | |
39 | ||
fe27cb35 | 40 | #include <asm/io.h> |
dde9f7ba | 41 | #include <asm/msr.h> |
fe27cb35 VP |
42 | #include <asm/processor.h> |
43 | #include <asm/cpufeature.h> | |
44 | #include <asm/delay.h> | |
45 | #include <asm/uaccess.h> | |
46 | ||
1da177e4 LT |
47 | #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "acpi-cpufreq", msg) |
48 | ||
49 | MODULE_AUTHOR("Paul Diefenbaugh, Dominik Brodowski"); | |
50 | MODULE_DESCRIPTION("ACPI Processor P-States Driver"); | |
51 | MODULE_LICENSE("GPL"); | |
52 | ||
dde9f7ba VP |
53 | enum { |
54 | UNDEFINED_CAPABLE = 0, | |
55 | SYSTEM_INTEL_MSR_CAPABLE, | |
56 | SYSTEM_IO_CAPABLE, | |
57 | }; | |
58 | ||
59 | #define INTEL_MSR_RANGE (0xffff) | |
dfde5d62 | 60 | #define CPUID_6_ECX_APERFMPERF_CAPABILITY (0x1) |
dde9f7ba | 61 | |
fe27cb35 | 62 | struct acpi_cpufreq_data { |
64be7eed VP |
63 | struct acpi_processor_performance *acpi_data; |
64 | struct cpufreq_frequency_table *freq_table; | |
dfde5d62 | 65 | unsigned int max_freq; |
64be7eed VP |
66 | unsigned int resume; |
67 | unsigned int cpu_feature; | |
1da177e4 LT |
68 | }; |
69 | ||
ea348f3e | 70 | static DEFINE_PER_CPU(struct acpi_cpufreq_data *, drv_data); |
71 | ||
50109292 FY |
72 | /* acpi_perf_data is a pointer to percpu data. */ |
73 | static struct acpi_processor_performance *acpi_perf_data; | |
1da177e4 LT |
74 | |
75 | static struct cpufreq_driver acpi_cpufreq_driver; | |
76 | ||
d395bf12 VP |
77 | static unsigned int acpi_pstate_strict; |
78 | ||
dde9f7ba VP |
79 | static int check_est_cpu(unsigned int cpuid) |
80 | { | |
92cb7612 | 81 | struct cpuinfo_x86 *cpu = &cpu_data(cpuid); |
dde9f7ba VP |
82 | |
83 | if (cpu->x86_vendor != X86_VENDOR_INTEL || | |
64be7eed | 84 | !cpu_has(cpu, X86_FEATURE_EST)) |
dde9f7ba VP |
85 | return 0; |
86 | ||
87 | return 1; | |
88 | } | |
89 | ||
dde9f7ba | 90 | static unsigned extract_io(u32 value, struct acpi_cpufreq_data *data) |
fe27cb35 | 91 | { |
64be7eed VP |
92 | struct acpi_processor_performance *perf; |
93 | int i; | |
fe27cb35 VP |
94 | |
95 | perf = data->acpi_data; | |
96 | ||
95dd7227 | 97 | for (i=0; i<perf->state_count; i++) { |
fe27cb35 VP |
98 | if (value == perf->states[i].status) |
99 | return data->freq_table[i].frequency; | |
100 | } | |
101 | return 0; | |
102 | } | |
103 | ||
dde9f7ba VP |
104 | static unsigned extract_msr(u32 msr, struct acpi_cpufreq_data *data) |
105 | { | |
106 | int i; | |
a6f6e6e6 | 107 | struct acpi_processor_performance *perf; |
dde9f7ba VP |
108 | |
109 | msr &= INTEL_MSR_RANGE; | |
a6f6e6e6 VP |
110 | perf = data->acpi_data; |
111 | ||
95dd7227 | 112 | for (i=0; data->freq_table[i].frequency != CPUFREQ_TABLE_END; i++) { |
a6f6e6e6 | 113 | if (msr == perf->states[data->freq_table[i].index].status) |
dde9f7ba VP |
114 | return data->freq_table[i].frequency; |
115 | } | |
116 | return data->freq_table[0].frequency; | |
117 | } | |
118 | ||
dde9f7ba VP |
119 | static unsigned extract_freq(u32 val, struct acpi_cpufreq_data *data) |
120 | { | |
121 | switch (data->cpu_feature) { | |
64be7eed | 122 | case SYSTEM_INTEL_MSR_CAPABLE: |
dde9f7ba | 123 | return extract_msr(val, data); |
64be7eed | 124 | case SYSTEM_IO_CAPABLE: |
dde9f7ba | 125 | return extract_io(val, data); |
64be7eed | 126 | default: |
dde9f7ba VP |
127 | return 0; |
128 | } | |
129 | } | |
130 | ||
dde9f7ba VP |
131 | struct msr_addr { |
132 | u32 reg; | |
133 | }; | |
134 | ||
fe27cb35 VP |
135 | struct io_addr { |
136 | u16 port; | |
137 | u8 bit_width; | |
138 | }; | |
139 | ||
dde9f7ba VP |
140 | typedef union { |
141 | struct msr_addr msr; | |
142 | struct io_addr io; | |
143 | } drv_addr_union; | |
144 | ||
fe27cb35 | 145 | struct drv_cmd { |
dde9f7ba | 146 | unsigned int type; |
fe27cb35 | 147 | cpumask_t mask; |
dde9f7ba | 148 | drv_addr_union addr; |
fe27cb35 VP |
149 | u32 val; |
150 | }; | |
151 | ||
152 | static void do_drv_read(struct drv_cmd *cmd) | |
1da177e4 | 153 | { |
dde9f7ba VP |
154 | u32 h; |
155 | ||
156 | switch (cmd->type) { | |
64be7eed | 157 | case SYSTEM_INTEL_MSR_CAPABLE: |
dde9f7ba VP |
158 | rdmsr(cmd->addr.msr.reg, cmd->val, h); |
159 | break; | |
64be7eed | 160 | case SYSTEM_IO_CAPABLE: |
4e581ff1 VP |
161 | acpi_os_read_port((acpi_io_address)cmd->addr.io.port, |
162 | &cmd->val, | |
163 | (u32)cmd->addr.io.bit_width); | |
dde9f7ba | 164 | break; |
64be7eed | 165 | default: |
dde9f7ba VP |
166 | break; |
167 | } | |
fe27cb35 | 168 | } |
1da177e4 | 169 | |
fe27cb35 VP |
170 | static void do_drv_write(struct drv_cmd *cmd) |
171 | { | |
13424f65 | 172 | u32 lo, hi; |
dde9f7ba VP |
173 | |
174 | switch (cmd->type) { | |
64be7eed | 175 | case SYSTEM_INTEL_MSR_CAPABLE: |
13424f65 VP |
176 | rdmsr(cmd->addr.msr.reg, lo, hi); |
177 | lo = (lo & ~INTEL_MSR_RANGE) | (cmd->val & INTEL_MSR_RANGE); | |
178 | wrmsr(cmd->addr.msr.reg, lo, hi); | |
dde9f7ba | 179 | break; |
64be7eed | 180 | case SYSTEM_IO_CAPABLE: |
4e581ff1 VP |
181 | acpi_os_write_port((acpi_io_address)cmd->addr.io.port, |
182 | cmd->val, | |
183 | (u32)cmd->addr.io.bit_width); | |
dde9f7ba | 184 | break; |
64be7eed | 185 | default: |
dde9f7ba VP |
186 | break; |
187 | } | |
fe27cb35 | 188 | } |
1da177e4 | 189 | |
95dd7227 | 190 | static void drv_read(struct drv_cmd *cmd) |
fe27cb35 | 191 | { |
64be7eed | 192 | cpumask_t saved_mask = current->cpus_allowed; |
fe27cb35 VP |
193 | cmd->val = 0; |
194 | ||
fc0e4748 | 195 | set_cpus_allowed_ptr(current, &cmd->mask); |
fe27cb35 | 196 | do_drv_read(cmd); |
fc0e4748 | 197 | set_cpus_allowed_ptr(current, &saved_mask); |
fe27cb35 VP |
198 | } |
199 | ||
200 | static void drv_write(struct drv_cmd *cmd) | |
201 | { | |
64be7eed VP |
202 | cpumask_t saved_mask = current->cpus_allowed; |
203 | unsigned int i; | |
fe27cb35 | 204 | |
334ef7a7 | 205 | for_each_cpu_mask_nr(i, cmd->mask) { |
0bc3cc03 | 206 | set_cpus_allowed_ptr(current, &cpumask_of_cpu(i)); |
fe27cb35 | 207 | do_drv_write(cmd); |
1da177e4 LT |
208 | } |
209 | ||
fc0e4748 | 210 | set_cpus_allowed_ptr(current, &saved_mask); |
fe27cb35 VP |
211 | return; |
212 | } | |
1da177e4 | 213 | |
fc0e4748 | 214 | static u32 get_cur_val(const cpumask_t *mask) |
fe27cb35 | 215 | { |
64be7eed VP |
216 | struct acpi_processor_performance *perf; |
217 | struct drv_cmd cmd; | |
1da177e4 | 218 | |
fc0e4748 | 219 | if (unlikely(cpus_empty(*mask))) |
fe27cb35 | 220 | return 0; |
1da177e4 | 221 | |
fc0e4748 | 222 | switch (per_cpu(drv_data, first_cpu(*mask))->cpu_feature) { |
dde9f7ba VP |
223 | case SYSTEM_INTEL_MSR_CAPABLE: |
224 | cmd.type = SYSTEM_INTEL_MSR_CAPABLE; | |
225 | cmd.addr.msr.reg = MSR_IA32_PERF_STATUS; | |
226 | break; | |
227 | case SYSTEM_IO_CAPABLE: | |
228 | cmd.type = SYSTEM_IO_CAPABLE; | |
fc0e4748 | 229 | perf = per_cpu(drv_data, first_cpu(*mask))->acpi_data; |
dde9f7ba VP |
230 | cmd.addr.io.port = perf->control_register.address; |
231 | cmd.addr.io.bit_width = perf->control_register.bit_width; | |
232 | break; | |
233 | default: | |
234 | return 0; | |
235 | } | |
236 | ||
fc0e4748 | 237 | cmd.mask = *mask; |
1da177e4 | 238 | |
fe27cb35 | 239 | drv_read(&cmd); |
1da177e4 | 240 | |
fe27cb35 VP |
241 | dprintk("get_cur_val = %u\n", cmd.val); |
242 | ||
243 | return cmd.val; | |
244 | } | |
1da177e4 | 245 | |
dfde5d62 VP |
246 | /* |
247 | * Return the measured active (C0) frequency on this CPU since last call | |
248 | * to this function. | |
249 | * Input: cpu number | |
250 | * Return: Average CPU frequency in terms of max frequency (zero on error) | |
251 | * | |
252 | * We use IA32_MPERF and IA32_APERF MSRs to get the measured performance | |
253 | * over a period of time, while CPU is in C0 state. | |
254 | * IA32_MPERF counts at the rate of max advertised frequency | |
255 | * IA32_APERF counts at the rate of actual CPU frequency | |
256 | * Only IA32_APERF/IA32_MPERF ratio is architecturally defined and | |
257 | * no meaning should be associated with absolute values of these MSRs. | |
258 | */ | |
bf0b90e3 | 259 | static unsigned int get_measured_perf(struct cpufreq_policy *policy, |
260 | unsigned int cpu) | |
dfde5d62 VP |
261 | { |
262 | union { | |
263 | struct { | |
264 | u32 lo; | |
265 | u32 hi; | |
266 | } split; | |
267 | u64 whole; | |
268 | } aperf_cur, mperf_cur; | |
269 | ||
270 | cpumask_t saved_mask; | |
271 | unsigned int perf_percent; | |
272 | unsigned int retval; | |
273 | ||
274 | saved_mask = current->cpus_allowed; | |
0bc3cc03 | 275 | set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu)); |
dfde5d62 VP |
276 | if (get_cpu() != cpu) { |
277 | /* We were not able to run on requested processor */ | |
278 | put_cpu(); | |
279 | return 0; | |
280 | } | |
281 | ||
282 | rdmsr(MSR_IA32_APERF, aperf_cur.split.lo, aperf_cur.split.hi); | |
283 | rdmsr(MSR_IA32_MPERF, mperf_cur.split.lo, mperf_cur.split.hi); | |
284 | ||
285 | wrmsr(MSR_IA32_APERF, 0,0); | |
286 | wrmsr(MSR_IA32_MPERF, 0,0); | |
287 | ||
288 | #ifdef __i386__ | |
289 | /* | |
290 | * We dont want to do 64 bit divide with 32 bit kernel | |
291 | * Get an approximate value. Return failure in case we cannot get | |
292 | * an approximate value. | |
293 | */ | |
294 | if (unlikely(aperf_cur.split.hi || mperf_cur.split.hi)) { | |
295 | int shift_count; | |
296 | u32 h; | |
297 | ||
298 | h = max_t(u32, aperf_cur.split.hi, mperf_cur.split.hi); | |
299 | shift_count = fls(h); | |
300 | ||
301 | aperf_cur.whole >>= shift_count; | |
302 | mperf_cur.whole >>= shift_count; | |
303 | } | |
304 | ||
305 | if (((unsigned long)(-1) / 100) < aperf_cur.split.lo) { | |
306 | int shift_count = 7; | |
307 | aperf_cur.split.lo >>= shift_count; | |
308 | mperf_cur.split.lo >>= shift_count; | |
309 | } | |
310 | ||
95dd7227 | 311 | if (aperf_cur.split.lo && mperf_cur.split.lo) |
dfde5d62 | 312 | perf_percent = (aperf_cur.split.lo * 100) / mperf_cur.split.lo; |
95dd7227 | 313 | else |
dfde5d62 | 314 | perf_percent = 0; |
dfde5d62 VP |
315 | |
316 | #else | |
317 | if (unlikely(((unsigned long)(-1) / 100) < aperf_cur.whole)) { | |
318 | int shift_count = 7; | |
319 | aperf_cur.whole >>= shift_count; | |
320 | mperf_cur.whole >>= shift_count; | |
321 | } | |
322 | ||
95dd7227 | 323 | if (aperf_cur.whole && mperf_cur.whole) |
dfde5d62 | 324 | perf_percent = (aperf_cur.whole * 100) / mperf_cur.whole; |
95dd7227 | 325 | else |
dfde5d62 | 326 | perf_percent = 0; |
dfde5d62 VP |
327 | |
328 | #endif | |
329 | ||
bf0b90e3 | 330 | retval = per_cpu(drv_data, policy->cpu)->max_freq * perf_percent / 100; |
dfde5d62 VP |
331 | |
332 | put_cpu(); | |
fc0e4748 | 333 | set_cpus_allowed_ptr(current, &saved_mask); |
dfde5d62 VP |
334 | |
335 | dprintk("cpu %d: performance percent %d\n", cpu, perf_percent); | |
336 | return retval; | |
337 | } | |
338 | ||
fe27cb35 VP |
339 | static unsigned int get_cur_freq_on_cpu(unsigned int cpu) |
340 | { | |
ea348f3e | 341 | struct acpi_cpufreq_data *data = per_cpu(drv_data, cpu); |
64be7eed | 342 | unsigned int freq; |
e56a727b | 343 | unsigned int cached_freq; |
fe27cb35 VP |
344 | |
345 | dprintk("get_cur_freq_on_cpu (%d)\n", cpu); | |
346 | ||
347 | if (unlikely(data == NULL || | |
64be7eed | 348 | data->acpi_data == NULL || data->freq_table == NULL)) { |
fe27cb35 | 349 | return 0; |
1da177e4 LT |
350 | } |
351 | ||
e56a727b | 352 | cached_freq = data->freq_table[data->acpi_data->state].frequency; |
0bc3cc03 | 353 | freq = extract_freq(get_cur_val(&cpumask_of_cpu(cpu)), data); |
e56a727b VP |
354 | if (freq != cached_freq) { |
355 | /* | |
356 | * The dreaded BIOS frequency change behind our back. | |
357 | * Force set the frequency on next target call. | |
358 | */ | |
359 | data->resume = 1; | |
360 | } | |
361 | ||
fe27cb35 | 362 | dprintk("cur freq = %u\n", freq); |
1da177e4 | 363 | |
fe27cb35 | 364 | return freq; |
1da177e4 LT |
365 | } |
366 | ||
fc0e4748 | 367 | static unsigned int check_freqs(const cpumask_t *mask, unsigned int freq, |
64be7eed | 368 | struct acpi_cpufreq_data *data) |
fe27cb35 | 369 | { |
64be7eed VP |
370 | unsigned int cur_freq; |
371 | unsigned int i; | |
1da177e4 | 372 | |
95dd7227 | 373 | for (i=0; i<100; i++) { |
fe27cb35 VP |
374 | cur_freq = extract_freq(get_cur_val(mask), data); |
375 | if (cur_freq == freq) | |
376 | return 1; | |
377 | udelay(10); | |
378 | } | |
379 | return 0; | |
380 | } | |
381 | ||
382 | static int acpi_cpufreq_target(struct cpufreq_policy *policy, | |
64be7eed | 383 | unsigned int target_freq, unsigned int relation) |
1da177e4 | 384 | { |
ea348f3e | 385 | struct acpi_cpufreq_data *data = per_cpu(drv_data, policy->cpu); |
64be7eed VP |
386 | struct acpi_processor_performance *perf; |
387 | struct cpufreq_freqs freqs; | |
388 | cpumask_t online_policy_cpus; | |
389 | struct drv_cmd cmd; | |
8edc59d9 VP |
390 | unsigned int next_state = 0; /* Index into freq_table */ |
391 | unsigned int next_perf_state = 0; /* Index into perf table */ | |
64be7eed VP |
392 | unsigned int i; |
393 | int result = 0; | |
fe27cb35 VP |
394 | |
395 | dprintk("acpi_cpufreq_target %d (%d)\n", target_freq, policy->cpu); | |
396 | ||
397 | if (unlikely(data == NULL || | |
95dd7227 | 398 | data->acpi_data == NULL || data->freq_table == NULL)) { |
fe27cb35 VP |
399 | return -ENODEV; |
400 | } | |
1da177e4 | 401 | |
fe27cb35 | 402 | perf = data->acpi_data; |
1da177e4 | 403 | result = cpufreq_frequency_table_target(policy, |
64be7eed VP |
404 | data->freq_table, |
405 | target_freq, | |
406 | relation, &next_state); | |
09b4d1ee | 407 | if (unlikely(result)) |
fe27cb35 | 408 | return -ENODEV; |
09b4d1ee | 409 | |
7e1f19e5 | 410 | #ifdef CONFIG_HOTPLUG_CPU |
09b4d1ee VP |
411 | /* cpufreq holds the hotplug lock, so we are safe from here on */ |
412 | cpus_and(online_policy_cpus, cpu_online_map, policy->cpus); | |
7e1f19e5 AM |
413 | #else |
414 | online_policy_cpus = policy->cpus; | |
415 | #endif | |
1da177e4 | 416 | |
fe27cb35 | 417 | next_perf_state = data->freq_table[next_state].index; |
7650b281 | 418 | if (perf->state == next_perf_state) { |
fe27cb35 | 419 | if (unlikely(data->resume)) { |
64be7eed VP |
420 | dprintk("Called after resume, resetting to P%d\n", |
421 | next_perf_state); | |
fe27cb35 VP |
422 | data->resume = 0; |
423 | } else { | |
64be7eed VP |
424 | dprintk("Already at target state (P%d)\n", |
425 | next_perf_state); | |
fe27cb35 VP |
426 | return 0; |
427 | } | |
09b4d1ee VP |
428 | } |
429 | ||
64be7eed VP |
430 | switch (data->cpu_feature) { |
431 | case SYSTEM_INTEL_MSR_CAPABLE: | |
432 | cmd.type = SYSTEM_INTEL_MSR_CAPABLE; | |
433 | cmd.addr.msr.reg = MSR_IA32_PERF_CTL; | |
13424f65 | 434 | cmd.val = (u32) perf->states[next_perf_state].control; |
64be7eed VP |
435 | break; |
436 | case SYSTEM_IO_CAPABLE: | |
437 | cmd.type = SYSTEM_IO_CAPABLE; | |
438 | cmd.addr.io.port = perf->control_register.address; | |
439 | cmd.addr.io.bit_width = perf->control_register.bit_width; | |
440 | cmd.val = (u32) perf->states[next_perf_state].control; | |
441 | break; | |
442 | default: | |
443 | return -ENODEV; | |
444 | } | |
09b4d1ee | 445 | |
fe27cb35 | 446 | cpus_clear(cmd.mask); |
09b4d1ee | 447 | |
fe27cb35 VP |
448 | if (policy->shared_type != CPUFREQ_SHARED_TYPE_ANY) |
449 | cmd.mask = online_policy_cpus; | |
450 | else | |
451 | cpu_set(policy->cpu, cmd.mask); | |
09b4d1ee | 452 | |
8edc59d9 VP |
453 | freqs.old = perf->states[perf->state].core_frequency * 1000; |
454 | freqs.new = data->freq_table[next_state].frequency; | |
334ef7a7 | 455 | for_each_cpu_mask_nr(i, cmd.mask) { |
fe27cb35 VP |
456 | freqs.cpu = i; |
457 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); | |
09b4d1ee | 458 | } |
1da177e4 | 459 | |
fe27cb35 | 460 | drv_write(&cmd); |
09b4d1ee | 461 | |
fe27cb35 | 462 | if (acpi_pstate_strict) { |
fc0e4748 | 463 | if (!check_freqs(&cmd.mask, freqs.new, data)) { |
fe27cb35 | 464 | dprintk("acpi_cpufreq_target failed (%d)\n", |
64be7eed | 465 | policy->cpu); |
fe27cb35 | 466 | return -EAGAIN; |
09b4d1ee VP |
467 | } |
468 | } | |
469 | ||
334ef7a7 | 470 | for_each_cpu_mask_nr(i, cmd.mask) { |
fe27cb35 VP |
471 | freqs.cpu = i; |
472 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); | |
473 | } | |
474 | perf->state = next_perf_state; | |
475 | ||
476 | return result; | |
1da177e4 LT |
477 | } |
478 | ||
64be7eed | 479 | static int acpi_cpufreq_verify(struct cpufreq_policy *policy) |
1da177e4 | 480 | { |
ea348f3e | 481 | struct acpi_cpufreq_data *data = per_cpu(drv_data, policy->cpu); |
1da177e4 LT |
482 | |
483 | dprintk("acpi_cpufreq_verify\n"); | |
484 | ||
fe27cb35 | 485 | return cpufreq_frequency_table_verify(policy, data->freq_table); |
1da177e4 LT |
486 | } |
487 | ||
1da177e4 | 488 | static unsigned long |
64be7eed | 489 | acpi_cpufreq_guess_freq(struct acpi_cpufreq_data *data, unsigned int cpu) |
1da177e4 | 490 | { |
64be7eed | 491 | struct acpi_processor_performance *perf = data->acpi_data; |
09b4d1ee | 492 | |
1da177e4 LT |
493 | if (cpu_khz) { |
494 | /* search the closest match to cpu_khz */ | |
495 | unsigned int i; | |
496 | unsigned long freq; | |
09b4d1ee | 497 | unsigned long freqn = perf->states[0].core_frequency * 1000; |
1da177e4 | 498 | |
95dd7227 | 499 | for (i=0; i<(perf->state_count-1); i++) { |
1da177e4 | 500 | freq = freqn; |
95dd7227 | 501 | freqn = perf->states[i+1].core_frequency * 1000; |
1da177e4 | 502 | if ((2 * cpu_khz) > (freqn + freq)) { |
09b4d1ee | 503 | perf->state = i; |
64be7eed | 504 | return freq; |
1da177e4 LT |
505 | } |
506 | } | |
95dd7227 | 507 | perf->state = perf->state_count-1; |
64be7eed | 508 | return freqn; |
09b4d1ee | 509 | } else { |
1da177e4 | 510 | /* assume CPU is at P0... */ |
09b4d1ee VP |
511 | perf->state = 0; |
512 | return perf->states[0].core_frequency * 1000; | |
513 | } | |
1da177e4 LT |
514 | } |
515 | ||
09b4d1ee VP |
516 | /* |
517 | * acpi_cpufreq_early_init - initialize ACPI P-States library | |
518 | * | |
519 | * Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c) | |
520 | * in order to determine correct frequency and voltage pairings. We can | |
521 | * do _PDC and _PSD and find out the processor dependency for the | |
522 | * actual init that will happen later... | |
523 | */ | |
50109292 | 524 | static int __init acpi_cpufreq_early_init(void) |
09b4d1ee | 525 | { |
09b4d1ee VP |
526 | dprintk("acpi_cpufreq_early_init\n"); |
527 | ||
50109292 FY |
528 | acpi_perf_data = alloc_percpu(struct acpi_processor_performance); |
529 | if (!acpi_perf_data) { | |
530 | dprintk("Memory allocation error for acpi_perf_data.\n"); | |
531 | return -ENOMEM; | |
09b4d1ee VP |
532 | } |
533 | ||
534 | /* Do initialization in ACPI core */ | |
fe27cb35 VP |
535 | acpi_processor_preregister_performance(acpi_perf_data); |
536 | return 0; | |
09b4d1ee VP |
537 | } |
538 | ||
95625b8f | 539 | #ifdef CONFIG_SMP |
8adcc0c6 VP |
540 | /* |
541 | * Some BIOSes do SW_ANY coordination internally, either set it up in hw | |
542 | * or do it in BIOS firmware and won't inform about it to OS. If not | |
543 | * detected, this has a side effect of making CPU run at a different speed | |
544 | * than OS intended it to run at. Detect it and handle it cleanly. | |
545 | */ | |
546 | static int bios_with_sw_any_bug; | |
547 | ||
1855256c | 548 | static int sw_any_bug_found(const struct dmi_system_id *d) |
8adcc0c6 VP |
549 | { |
550 | bios_with_sw_any_bug = 1; | |
551 | return 0; | |
552 | } | |
553 | ||
1855256c | 554 | static const struct dmi_system_id sw_any_bug_dmi_table[] = { |
8adcc0c6 VP |
555 | { |
556 | .callback = sw_any_bug_found, | |
557 | .ident = "Supermicro Server X6DLP", | |
558 | .matches = { | |
559 | DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"), | |
560 | DMI_MATCH(DMI_BIOS_VERSION, "080010"), | |
561 | DMI_MATCH(DMI_PRODUCT_NAME, "X6DLP"), | |
562 | }, | |
563 | }, | |
564 | { } | |
565 | }; | |
95625b8f | 566 | #endif |
8adcc0c6 | 567 | |
64be7eed | 568 | static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy) |
1da177e4 | 569 | { |
64be7eed VP |
570 | unsigned int i; |
571 | unsigned int valid_states = 0; | |
572 | unsigned int cpu = policy->cpu; | |
573 | struct acpi_cpufreq_data *data; | |
64be7eed | 574 | unsigned int result = 0; |
92cb7612 | 575 | struct cpuinfo_x86 *c = &cpu_data(policy->cpu); |
64be7eed | 576 | struct acpi_processor_performance *perf; |
1da177e4 | 577 | |
1da177e4 | 578 | dprintk("acpi_cpufreq_cpu_init\n"); |
1da177e4 | 579 | |
fe27cb35 | 580 | data = kzalloc(sizeof(struct acpi_cpufreq_data), GFP_KERNEL); |
1da177e4 | 581 | if (!data) |
64be7eed | 582 | return -ENOMEM; |
1da177e4 | 583 | |
50109292 | 584 | data->acpi_data = percpu_ptr(acpi_perf_data, cpu); |
ea348f3e | 585 | per_cpu(drv_data, cpu) = data; |
1da177e4 | 586 | |
95dd7227 | 587 | if (cpu_has(c, X86_FEATURE_CONSTANT_TSC)) |
fe27cb35 | 588 | acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS; |
1da177e4 | 589 | |
fe27cb35 | 590 | result = acpi_processor_register_performance(data->acpi_data, cpu); |
1da177e4 LT |
591 | if (result) |
592 | goto err_free; | |
593 | ||
09b4d1ee | 594 | perf = data->acpi_data; |
09b4d1ee | 595 | policy->shared_type = perf->shared_type; |
95dd7227 | 596 | |
46f18e3a | 597 | /* |
95dd7227 | 598 | * Will let policy->cpus know about dependency only when software |
46f18e3a VP |
599 | * coordination is required. |
600 | */ | |
601 | if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL || | |
8adcc0c6 | 602 | policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) { |
46f18e3a | 603 | policy->cpus = perf->shared_cpu_map; |
8adcc0c6 | 604 | } |
e8628dd0 | 605 | policy->related_cpus = perf->shared_cpu_map; |
8adcc0c6 VP |
606 | |
607 | #ifdef CONFIG_SMP | |
608 | dmi_check_system(sw_any_bug_dmi_table); | |
609 | if (bios_with_sw_any_bug && cpus_weight(policy->cpus) == 1) { | |
610 | policy->shared_type = CPUFREQ_SHARED_TYPE_ALL; | |
08357611 | 611 | policy->cpus = per_cpu(cpu_core_map, cpu); |
8adcc0c6 VP |
612 | } |
613 | #endif | |
09b4d1ee | 614 | |
1da177e4 | 615 | /* capability check */ |
09b4d1ee | 616 | if (perf->state_count <= 1) { |
1da177e4 LT |
617 | dprintk("No P-States\n"); |
618 | result = -ENODEV; | |
619 | goto err_unreg; | |
620 | } | |
09b4d1ee | 621 | |
fe27cb35 VP |
622 | if (perf->control_register.space_id != perf->status_register.space_id) { |
623 | result = -ENODEV; | |
624 | goto err_unreg; | |
625 | } | |
626 | ||
627 | switch (perf->control_register.space_id) { | |
64be7eed | 628 | case ACPI_ADR_SPACE_SYSTEM_IO: |
fe27cb35 | 629 | dprintk("SYSTEM IO addr space\n"); |
dde9f7ba VP |
630 | data->cpu_feature = SYSTEM_IO_CAPABLE; |
631 | break; | |
64be7eed | 632 | case ACPI_ADR_SPACE_FIXED_HARDWARE: |
dde9f7ba VP |
633 | dprintk("HARDWARE addr space\n"); |
634 | if (!check_est_cpu(cpu)) { | |
635 | result = -ENODEV; | |
636 | goto err_unreg; | |
637 | } | |
638 | data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE; | |
fe27cb35 | 639 | break; |
64be7eed | 640 | default: |
fe27cb35 | 641 | dprintk("Unknown addr space %d\n", |
64be7eed | 642 | (u32) (perf->control_register.space_id)); |
1da177e4 LT |
643 | result = -ENODEV; |
644 | goto err_unreg; | |
645 | } | |
646 | ||
95dd7227 DJ |
647 | data->freq_table = kmalloc(sizeof(struct cpufreq_frequency_table) * |
648 | (perf->state_count+1), GFP_KERNEL); | |
1da177e4 LT |
649 | if (!data->freq_table) { |
650 | result = -ENOMEM; | |
651 | goto err_unreg; | |
652 | } | |
653 | ||
654 | /* detect transition latency */ | |
655 | policy->cpuinfo.transition_latency = 0; | |
95dd7227 | 656 | for (i=0; i<perf->state_count; i++) { |
64be7eed VP |
657 | if ((perf->states[i].transition_latency * 1000) > |
658 | policy->cpuinfo.transition_latency) | |
659 | policy->cpuinfo.transition_latency = | |
660 | perf->states[i].transition_latency * 1000; | |
1da177e4 | 661 | } |
1da177e4 | 662 | |
dfde5d62 | 663 | data->max_freq = perf->states[0].core_frequency * 1000; |
1da177e4 | 664 | /* table init */ |
95dd7227 | 665 | for (i=0; i<perf->state_count; i++) { |
3cdf552b ZR |
666 | if (i>0 && perf->states[i].core_frequency >= |
667 | data->freq_table[valid_states-1].frequency / 1000) | |
fe27cb35 VP |
668 | continue; |
669 | ||
670 | data->freq_table[valid_states].index = i; | |
671 | data->freq_table[valid_states].frequency = | |
64be7eed | 672 | perf->states[i].core_frequency * 1000; |
fe27cb35 | 673 | valid_states++; |
1da177e4 | 674 | } |
3d4a7ef3 | 675 | data->freq_table[valid_states].frequency = CPUFREQ_TABLE_END; |
8edc59d9 | 676 | perf->state = 0; |
1da177e4 LT |
677 | |
678 | result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table); | |
95dd7227 | 679 | if (result) |
1da177e4 | 680 | goto err_freqfree; |
1da177e4 | 681 | |
a507ac4b | 682 | switch (perf->control_register.space_id) { |
64be7eed | 683 | case ACPI_ADR_SPACE_SYSTEM_IO: |
dde9f7ba VP |
684 | /* Current speed is unknown and not detectable by IO port */ |
685 | policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu); | |
686 | break; | |
64be7eed | 687 | case ACPI_ADR_SPACE_FIXED_HARDWARE: |
7650b281 | 688 | acpi_cpufreq_driver.get = get_cur_freq_on_cpu; |
a507ac4b | 689 | policy->cur = get_cur_freq_on_cpu(cpu); |
dde9f7ba | 690 | break; |
64be7eed | 691 | default: |
dde9f7ba VP |
692 | break; |
693 | } | |
694 | ||
1da177e4 LT |
695 | /* notify BIOS that we exist */ |
696 | acpi_processor_notify_smm(THIS_MODULE); | |
697 | ||
dfde5d62 VP |
698 | /* Check for APERF/MPERF support in hardware */ |
699 | if (c->x86_vendor == X86_VENDOR_INTEL && c->cpuid_level >= 6) { | |
700 | unsigned int ecx; | |
701 | ecx = cpuid_ecx(6); | |
95dd7227 | 702 | if (ecx & CPUID_6_ECX_APERFMPERF_CAPABILITY) |
dfde5d62 | 703 | acpi_cpufreq_driver.getavg = get_measured_perf; |
dfde5d62 VP |
704 | } |
705 | ||
fe27cb35 | 706 | dprintk("CPU%u - ACPI performance management activated.\n", cpu); |
09b4d1ee | 707 | for (i = 0; i < perf->state_count; i++) |
1da177e4 | 708 | dprintk(" %cP%d: %d MHz, %d mW, %d uS\n", |
64be7eed | 709 | (i == perf->state ? '*' : ' '), i, |
09b4d1ee VP |
710 | (u32) perf->states[i].core_frequency, |
711 | (u32) perf->states[i].power, | |
712 | (u32) perf->states[i].transition_latency); | |
1da177e4 LT |
713 | |
714 | cpufreq_frequency_table_get_attr(data->freq_table, policy->cpu); | |
64be7eed | 715 | |
4b31e774 DB |
716 | /* |
717 | * the first call to ->target() should result in us actually | |
718 | * writing something to the appropriate registers. | |
719 | */ | |
720 | data->resume = 1; | |
64be7eed | 721 | |
fe27cb35 | 722 | return result; |
1da177e4 | 723 | |
95dd7227 | 724 | err_freqfree: |
1da177e4 | 725 | kfree(data->freq_table); |
95dd7227 | 726 | err_unreg: |
09b4d1ee | 727 | acpi_processor_unregister_performance(perf, cpu); |
95dd7227 | 728 | err_free: |
1da177e4 | 729 | kfree(data); |
ea348f3e | 730 | per_cpu(drv_data, cpu) = NULL; |
1da177e4 | 731 | |
64be7eed | 732 | return result; |
1da177e4 LT |
733 | } |
734 | ||
64be7eed | 735 | static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy) |
1da177e4 | 736 | { |
ea348f3e | 737 | struct acpi_cpufreq_data *data = per_cpu(drv_data, policy->cpu); |
1da177e4 | 738 | |
1da177e4 LT |
739 | dprintk("acpi_cpufreq_cpu_exit\n"); |
740 | ||
741 | if (data) { | |
742 | cpufreq_frequency_table_put_attr(policy->cpu); | |
ea348f3e | 743 | per_cpu(drv_data, policy->cpu) = NULL; |
64be7eed VP |
744 | acpi_processor_unregister_performance(data->acpi_data, |
745 | policy->cpu); | |
1da177e4 LT |
746 | kfree(data); |
747 | } | |
748 | ||
64be7eed | 749 | return 0; |
1da177e4 LT |
750 | } |
751 | ||
64be7eed | 752 | static int acpi_cpufreq_resume(struct cpufreq_policy *policy) |
1da177e4 | 753 | { |
ea348f3e | 754 | struct acpi_cpufreq_data *data = per_cpu(drv_data, policy->cpu); |
1da177e4 | 755 | |
1da177e4 LT |
756 | dprintk("acpi_cpufreq_resume\n"); |
757 | ||
758 | data->resume = 1; | |
759 | ||
64be7eed | 760 | return 0; |
1da177e4 LT |
761 | } |
762 | ||
64be7eed | 763 | static struct freq_attr *acpi_cpufreq_attr[] = { |
1da177e4 LT |
764 | &cpufreq_freq_attr_scaling_available_freqs, |
765 | NULL, | |
766 | }; | |
767 | ||
768 | static struct cpufreq_driver acpi_cpufreq_driver = { | |
64be7eed VP |
769 | .verify = acpi_cpufreq_verify, |
770 | .target = acpi_cpufreq_target, | |
64be7eed VP |
771 | .init = acpi_cpufreq_cpu_init, |
772 | .exit = acpi_cpufreq_cpu_exit, | |
773 | .resume = acpi_cpufreq_resume, | |
774 | .name = "acpi-cpufreq", | |
775 | .owner = THIS_MODULE, | |
776 | .attr = acpi_cpufreq_attr, | |
1da177e4 LT |
777 | }; |
778 | ||
64be7eed | 779 | static int __init acpi_cpufreq_init(void) |
1da177e4 | 780 | { |
50109292 FY |
781 | int ret; |
782 | ||
ee297533 YL |
783 | if (acpi_disabled) |
784 | return 0; | |
785 | ||
1da177e4 LT |
786 | dprintk("acpi_cpufreq_init\n"); |
787 | ||
50109292 FY |
788 | ret = acpi_cpufreq_early_init(); |
789 | if (ret) | |
790 | return ret; | |
09b4d1ee | 791 | |
847aef6f AM |
792 | ret = cpufreq_register_driver(&acpi_cpufreq_driver); |
793 | if (ret) | |
794 | free_percpu(acpi_perf_data); | |
795 | ||
796 | return ret; | |
1da177e4 LT |
797 | } |
798 | ||
64be7eed | 799 | static void __exit acpi_cpufreq_exit(void) |
1da177e4 LT |
800 | { |
801 | dprintk("acpi_cpufreq_exit\n"); | |
802 | ||
803 | cpufreq_unregister_driver(&acpi_cpufreq_driver); | |
804 | ||
50109292 | 805 | free_percpu(acpi_perf_data); |
1da177e4 LT |
806 | } |
807 | ||
d395bf12 | 808 | module_param(acpi_pstate_strict, uint, 0644); |
64be7eed | 809 | MODULE_PARM_DESC(acpi_pstate_strict, |
95dd7227 DJ |
810 | "value 0 or non-zero. non-zero -> strict ACPI checks are " |
811 | "performed during frequency changes."); | |
1da177e4 LT |
812 | |
813 | late_initcall(acpi_cpufreq_init); | |
814 | module_exit(acpi_cpufreq_exit); | |
815 | ||
816 | MODULE_ALIAS("acpi"); |