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> |
4e57b681 | 35 | #include <linux/sched.h> /* current */ |
8adcc0c6 | 36 | #include <linux/dmi.h> |
1da177e4 LT |
37 | |
38 | #include <linux/acpi.h> | |
39 | #include <acpi/processor.h> | |
40 | ||
fe27cb35 VP |
41 | #include <asm/io.h> |
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 | ||
53 | ||
fe27cb35 | 54 | struct acpi_cpufreq_data { |
09b4d1ee | 55 | struct acpi_processor_performance *acpi_data; |
1da177e4 LT |
56 | struct cpufreq_frequency_table *freq_table; |
57 | unsigned int resume; | |
58 | }; | |
59 | ||
fe27cb35 | 60 | static struct acpi_cpufreq_data *drv_data[NR_CPUS]; |
09b4d1ee | 61 | static struct acpi_processor_performance *acpi_perf_data[NR_CPUS]; |
1da177e4 LT |
62 | |
63 | static struct cpufreq_driver acpi_cpufreq_driver; | |
64 | ||
d395bf12 VP |
65 | static unsigned int acpi_pstate_strict; |
66 | ||
fe27cb35 VP |
67 | static unsigned extract_freq(u32 value, struct acpi_cpufreq_data *data) |
68 | { | |
69 | struct acpi_processor_performance *perf; | |
70 | int i; | |
71 | ||
72 | perf = data->acpi_data; | |
73 | ||
74 | for (i = 0; i < perf->state_count; i++) { | |
75 | if (value == perf->states[i].status) | |
76 | return data->freq_table[i].frequency; | |
77 | } | |
78 | return 0; | |
79 | } | |
80 | ||
81 | ||
82 | static void wrport(u16 port, u8 bit_width, u32 value) | |
1da177e4 LT |
83 | { |
84 | if (bit_width <= 8) { | |
85 | outb(value, port); | |
86 | } else if (bit_width <= 16) { | |
87 | outw(value, port); | |
88 | } else if (bit_width <= 32) { | |
89 | outl(value, port); | |
1da177e4 | 90 | } |
1da177e4 LT |
91 | } |
92 | ||
fe27cb35 | 93 | static void rdport(u16 port, u8 bit_width, u32 *ret) |
1da177e4 LT |
94 | { |
95 | *ret = 0; | |
96 | if (bit_width <= 8) { | |
97 | *ret = inb(port); | |
98 | } else if (bit_width <= 16) { | |
99 | *ret = inw(port); | |
100 | } else if (bit_width <= 32) { | |
101 | *ret = inl(port); | |
1da177e4 | 102 | } |
1da177e4 LT |
103 | } |
104 | ||
fe27cb35 VP |
105 | struct io_addr { |
106 | u16 port; | |
107 | u8 bit_width; | |
108 | }; | |
109 | ||
110 | struct drv_cmd { | |
111 | cpumask_t mask; | |
112 | struct io_addr addr; | |
113 | u32 val; | |
114 | }; | |
115 | ||
116 | static void do_drv_read(struct drv_cmd *cmd) | |
1da177e4 | 117 | { |
fe27cb35 VP |
118 | rdport(cmd->addr.port, cmd->addr.bit_width, &cmd->val); |
119 | return; | |
120 | } | |
1da177e4 | 121 | |
fe27cb35 VP |
122 | static void do_drv_write(struct drv_cmd *cmd) |
123 | { | |
124 | wrport(cmd->addr.port, cmd->addr.bit_width, cmd->val); | |
125 | return; | |
126 | } | |
1da177e4 | 127 | |
fe27cb35 VP |
128 | static inline void drv_read(struct drv_cmd *cmd) |
129 | { | |
130 | cpumask_t saved_mask = current->cpus_allowed; | |
131 | cmd->val = 0; | |
132 | ||
133 | set_cpus_allowed(current, cmd->mask); | |
134 | do_drv_read(cmd); | |
135 | set_cpus_allowed(current, saved_mask); | |
136 | ||
137 | } | |
138 | ||
139 | static void drv_write(struct drv_cmd *cmd) | |
140 | { | |
141 | cpumask_t saved_mask = current->cpus_allowed; | |
142 | unsigned int i; | |
143 | ||
144 | for_each_cpu_mask(i, cmd->mask) { | |
145 | set_cpus_allowed(current, cpumask_of_cpu(i)); | |
146 | do_drv_write(cmd); | |
1da177e4 LT |
147 | } |
148 | ||
fe27cb35 VP |
149 | set_cpus_allowed(current, saved_mask); |
150 | return; | |
151 | } | |
1da177e4 | 152 | |
fe27cb35 VP |
153 | static u32 get_cur_val(cpumask_t mask) |
154 | { | |
155 | struct acpi_processor_performance *perf; | |
156 | struct drv_cmd cmd; | |
1da177e4 | 157 | |
fe27cb35 VP |
158 | if (unlikely(cpus_empty(mask))) |
159 | return 0; | |
1da177e4 | 160 | |
fe27cb35 VP |
161 | perf = drv_data[first_cpu(mask)]->acpi_data; |
162 | cmd.addr.port = perf->control_register.address; | |
163 | cmd.addr.bit_width = perf->control_register.bit_width; | |
164 | cmd.mask = mask; | |
1da177e4 | 165 | |
fe27cb35 | 166 | drv_read(&cmd); |
1da177e4 | 167 | |
fe27cb35 VP |
168 | dprintk("get_cur_val = %u\n", cmd.val); |
169 | ||
170 | return cmd.val; | |
171 | } | |
1da177e4 | 172 | |
fe27cb35 VP |
173 | static unsigned int get_cur_freq_on_cpu(unsigned int cpu) |
174 | { | |
175 | struct acpi_cpufreq_data *data = drv_data[cpu]; | |
176 | unsigned int freq; | |
177 | ||
178 | dprintk("get_cur_freq_on_cpu (%d)\n", cpu); | |
179 | ||
180 | if (unlikely(data == NULL || | |
181 | data->acpi_data == NULL || | |
182 | data->freq_table == NULL)) { | |
183 | return 0; | |
1da177e4 LT |
184 | } |
185 | ||
fe27cb35 VP |
186 | freq = extract_freq(get_cur_val(cpumask_of_cpu(cpu)), data); |
187 | dprintk("cur freq = %u\n", freq); | |
1da177e4 | 188 | |
fe27cb35 | 189 | return freq; |
1da177e4 LT |
190 | } |
191 | ||
fe27cb35 VP |
192 | static unsigned int check_freqs(cpumask_t mask, unsigned int freq, |
193 | struct acpi_cpufreq_data *data) | |
194 | { | |
195 | unsigned int cur_freq; | |
196 | unsigned int i; | |
1da177e4 | 197 | |
fe27cb35 VP |
198 | for (i = 0; i < 100; i++) { |
199 | cur_freq = extract_freq(get_cur_val(mask), data); | |
200 | if (cur_freq == freq) | |
201 | return 1; | |
202 | udelay(10); | |
203 | } | |
204 | return 0; | |
205 | } | |
206 | ||
207 | static int acpi_cpufreq_target(struct cpufreq_policy *policy, | |
208 | unsigned int target_freq, | |
209 | unsigned int relation) | |
1da177e4 | 210 | { |
fe27cb35 VP |
211 | struct acpi_cpufreq_data *data = drv_data[policy->cpu]; |
212 | struct acpi_processor_performance *perf; | |
213 | struct cpufreq_freqs freqs; | |
214 | cpumask_t online_policy_cpus; | |
215 | struct drv_cmd cmd; | |
216 | unsigned int next_state = 0; | |
217 | unsigned int next_perf_state = 0; | |
218 | unsigned int i; | |
219 | int result = 0; | |
220 | ||
221 | dprintk("acpi_cpufreq_target %d (%d)\n", target_freq, policy->cpu); | |
222 | ||
223 | if (unlikely(data == NULL || | |
224 | data->acpi_data == NULL || | |
225 | data->freq_table == NULL)) { | |
226 | return -ENODEV; | |
227 | } | |
1da177e4 | 228 | |
fe27cb35 | 229 | perf = data->acpi_data; |
1da177e4 | 230 | result = cpufreq_frequency_table_target(policy, |
fe27cb35 VP |
231 | data->freq_table, |
232 | target_freq, | |
233 | relation, | |
234 | &next_state); | |
09b4d1ee | 235 | if (unlikely(result)) |
fe27cb35 | 236 | return -ENODEV; |
09b4d1ee | 237 | |
7e1f19e5 | 238 | #ifdef CONFIG_HOTPLUG_CPU |
09b4d1ee VP |
239 | /* cpufreq holds the hotplug lock, so we are safe from here on */ |
240 | cpus_and(online_policy_cpus, cpu_online_map, policy->cpus); | |
7e1f19e5 AM |
241 | #else |
242 | online_policy_cpus = policy->cpus; | |
243 | #endif | |
1da177e4 | 244 | |
fe27cb35 VP |
245 | cmd.val = get_cur_val(online_policy_cpus); |
246 | freqs.old = extract_freq(cmd.val, data); | |
247 | freqs.new = data->freq_table[next_state].frequency; | |
248 | next_perf_state = data->freq_table[next_state].index; | |
249 | if (freqs.new == freqs.old) { | |
250 | if (unlikely(data->resume)) { | |
251 | dprintk("Called after resume, resetting to P%d\n", next_perf_state); | |
252 | data->resume = 0; | |
253 | } else { | |
254 | dprintk("Already at target state (P%d)\n", next_perf_state); | |
255 | return 0; | |
256 | } | |
09b4d1ee VP |
257 | } |
258 | ||
fe27cb35 VP |
259 | cmd.addr.port = perf->control_register.address; |
260 | cmd.addr.bit_width = perf->control_register.bit_width; | |
261 | cmd.val = (u32) perf->states[next_perf_state].control; | |
09b4d1ee | 262 | |
fe27cb35 | 263 | cpus_clear(cmd.mask); |
09b4d1ee | 264 | |
fe27cb35 VP |
265 | if (policy->shared_type != CPUFREQ_SHARED_TYPE_ANY) |
266 | cmd.mask = online_policy_cpus; | |
267 | else | |
268 | cpu_set(policy->cpu, cmd.mask); | |
09b4d1ee | 269 | |
fe27cb35 VP |
270 | for_each_cpu_mask(i, cmd.mask) { |
271 | freqs.cpu = i; | |
272 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); | |
09b4d1ee | 273 | } |
1da177e4 | 274 | |
fe27cb35 | 275 | drv_write(&cmd); |
09b4d1ee | 276 | |
fe27cb35 VP |
277 | if (acpi_pstate_strict) { |
278 | if (!check_freqs(cmd.mask, freqs.new, data)) { | |
279 | dprintk("acpi_cpufreq_target failed (%d)\n", | |
280 | policy->cpu); | |
281 | return -EAGAIN; | |
09b4d1ee VP |
282 | } |
283 | } | |
284 | ||
fe27cb35 VP |
285 | for_each_cpu_mask(i, cmd.mask) { |
286 | freqs.cpu = i; | |
287 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); | |
288 | } | |
289 | perf->state = next_perf_state; | |
290 | ||
291 | return result; | |
1da177e4 LT |
292 | } |
293 | ||
294 | ||
295 | static int | |
296 | acpi_cpufreq_verify ( | |
297 | struct cpufreq_policy *policy) | |
298 | { | |
fe27cb35 | 299 | struct acpi_cpufreq_data *data = drv_data[policy->cpu]; |
1da177e4 LT |
300 | |
301 | dprintk("acpi_cpufreq_verify\n"); | |
302 | ||
fe27cb35 | 303 | return cpufreq_frequency_table_verify(policy, data->freq_table); |
1da177e4 LT |
304 | } |
305 | ||
306 | ||
307 | static unsigned long | |
308 | acpi_cpufreq_guess_freq ( | |
fe27cb35 | 309 | struct acpi_cpufreq_data *data, |
1da177e4 LT |
310 | unsigned int cpu) |
311 | { | |
09b4d1ee VP |
312 | struct acpi_processor_performance *perf = data->acpi_data; |
313 | ||
1da177e4 LT |
314 | if (cpu_khz) { |
315 | /* search the closest match to cpu_khz */ | |
316 | unsigned int i; | |
317 | unsigned long freq; | |
09b4d1ee | 318 | unsigned long freqn = perf->states[0].core_frequency * 1000; |
1da177e4 | 319 | |
09b4d1ee | 320 | for (i = 0; i < (perf->state_count - 1); i++) { |
1da177e4 | 321 | freq = freqn; |
09b4d1ee | 322 | freqn = perf->states[i+1].core_frequency * 1000; |
1da177e4 | 323 | if ((2 * cpu_khz) > (freqn + freq)) { |
09b4d1ee | 324 | perf->state = i; |
1da177e4 LT |
325 | return (freq); |
326 | } | |
327 | } | |
09b4d1ee | 328 | perf->state = perf->state_count - 1; |
1da177e4 | 329 | return (freqn); |
09b4d1ee | 330 | } else { |
1da177e4 | 331 | /* assume CPU is at P0... */ |
09b4d1ee VP |
332 | perf->state = 0; |
333 | return perf->states[0].core_frequency * 1000; | |
334 | } | |
1da177e4 LT |
335 | } |
336 | ||
337 | ||
09b4d1ee VP |
338 | /* |
339 | * acpi_cpufreq_early_init - initialize ACPI P-States library | |
340 | * | |
341 | * Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c) | |
342 | * in order to determine correct frequency and voltage pairings. We can | |
343 | * do _PDC and _PSD and find out the processor dependency for the | |
344 | * actual init that will happen later... | |
345 | */ | |
fe27cb35 | 346 | static int acpi_cpufreq_early_init(void) |
09b4d1ee VP |
347 | { |
348 | struct acpi_processor_performance *data; | |
fe27cb35 | 349 | cpumask_t covered; |
09b4d1ee VP |
350 | unsigned int i, j; |
351 | ||
352 | dprintk("acpi_cpufreq_early_init\n"); | |
353 | ||
fb1bb34d | 354 | for_each_possible_cpu(i) { |
09b4d1ee VP |
355 | data = kzalloc(sizeof(struct acpi_processor_performance), |
356 | GFP_KERNEL); | |
357 | if (!data) { | |
fe27cb35 | 358 | for_each_cpu_mask(j, covered) { |
09b4d1ee VP |
359 | kfree(acpi_perf_data[j]); |
360 | acpi_perf_data[j] = NULL; | |
361 | } | |
362 | return (-ENOMEM); | |
363 | } | |
364 | acpi_perf_data[i] = data; | |
fe27cb35 | 365 | cpu_set(i, covered); |
09b4d1ee VP |
366 | } |
367 | ||
368 | /* Do initialization in ACPI core */ | |
fe27cb35 VP |
369 | acpi_processor_preregister_performance(acpi_perf_data); |
370 | return 0; | |
09b4d1ee VP |
371 | } |
372 | ||
8adcc0c6 VP |
373 | /* |
374 | * Some BIOSes do SW_ANY coordination internally, either set it up in hw | |
375 | * or do it in BIOS firmware and won't inform about it to OS. If not | |
376 | * detected, this has a side effect of making CPU run at a different speed | |
377 | * than OS intended it to run at. Detect it and handle it cleanly. | |
378 | */ | |
379 | static int bios_with_sw_any_bug; | |
380 | ||
0497c8ca | 381 | static int sw_any_bug_found(struct dmi_system_id *d) |
8adcc0c6 VP |
382 | { |
383 | bios_with_sw_any_bug = 1; | |
384 | return 0; | |
385 | } | |
386 | ||
0497c8ca | 387 | static struct dmi_system_id sw_any_bug_dmi_table[] = { |
8adcc0c6 VP |
388 | { |
389 | .callback = sw_any_bug_found, | |
390 | .ident = "Supermicro Server X6DLP", | |
391 | .matches = { | |
392 | DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"), | |
393 | DMI_MATCH(DMI_BIOS_VERSION, "080010"), | |
394 | DMI_MATCH(DMI_PRODUCT_NAME, "X6DLP"), | |
395 | }, | |
396 | }, | |
397 | { } | |
398 | }; | |
399 | ||
1da177e4 LT |
400 | static int |
401 | acpi_cpufreq_cpu_init ( | |
402 | struct cpufreq_policy *policy) | |
403 | { | |
fe27cb35 VP |
404 | unsigned int i; |
405 | unsigned int valid_states = 0; | |
406 | unsigned int cpu = policy->cpu; | |
407 | struct acpi_cpufreq_data *data; | |
408 | unsigned int result = 0; | |
409 | struct cpuinfo_x86 *c = &cpu_data[policy->cpu]; | |
09b4d1ee | 410 | struct acpi_processor_performance *perf; |
1da177e4 | 411 | |
1da177e4 | 412 | dprintk("acpi_cpufreq_cpu_init\n"); |
1da177e4 | 413 | |
09b4d1ee VP |
414 | if (!acpi_perf_data[cpu]) |
415 | return (-ENODEV); | |
416 | ||
fe27cb35 | 417 | data = kzalloc(sizeof(struct acpi_cpufreq_data), GFP_KERNEL); |
1da177e4 LT |
418 | if (!data) |
419 | return (-ENOMEM); | |
1da177e4 | 420 | |
09b4d1ee | 421 | data->acpi_data = acpi_perf_data[cpu]; |
fe27cb35 | 422 | drv_data[cpu] = data; |
1da177e4 | 423 | |
fe27cb35 VP |
424 | if (cpu_has(c, X86_FEATURE_CONSTANT_TSC)) { |
425 | acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS; | |
426 | } | |
1da177e4 | 427 | |
fe27cb35 | 428 | result = acpi_processor_register_performance(data->acpi_data, cpu); |
1da177e4 LT |
429 | if (result) |
430 | goto err_free; | |
431 | ||
09b4d1ee | 432 | perf = data->acpi_data; |
09b4d1ee | 433 | policy->shared_type = perf->shared_type; |
46f18e3a VP |
434 | /* |
435 | * Will let policy->cpus know about dependency only when software | |
436 | * coordination is required. | |
437 | */ | |
438 | if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL || | |
8adcc0c6 | 439 | policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) { |
46f18e3a | 440 | policy->cpus = perf->shared_cpu_map; |
8adcc0c6 VP |
441 | } |
442 | ||
443 | #ifdef CONFIG_SMP | |
444 | dmi_check_system(sw_any_bug_dmi_table); | |
445 | if (bios_with_sw_any_bug && cpus_weight(policy->cpus) == 1) { | |
446 | policy->shared_type = CPUFREQ_SHARED_TYPE_ALL; | |
447 | policy->cpus = cpu_core_map[cpu]; | |
448 | } | |
449 | #endif | |
09b4d1ee | 450 | |
1da177e4 | 451 | /* capability check */ |
09b4d1ee | 452 | if (perf->state_count <= 1) { |
1da177e4 LT |
453 | dprintk("No P-States\n"); |
454 | result = -ENODEV; | |
455 | goto err_unreg; | |
456 | } | |
09b4d1ee | 457 | |
fe27cb35 VP |
458 | if (perf->control_register.space_id != perf->status_register.space_id) { |
459 | result = -ENODEV; | |
460 | goto err_unreg; | |
461 | } | |
462 | ||
463 | switch (perf->control_register.space_id) { | |
464 | case ACPI_ADR_SPACE_SYSTEM_IO: | |
465 | dprintk("SYSTEM IO addr space\n"); | |
466 | break; | |
467 | default: | |
468 | dprintk("Unknown addr space %d\n", | |
469 | (u32) (perf->control_register.space_id)); | |
1da177e4 LT |
470 | result = -ENODEV; |
471 | goto err_unreg; | |
472 | } | |
473 | ||
09b4d1ee | 474 | data->freq_table = kmalloc(sizeof(struct cpufreq_frequency_table) * (perf->state_count + 1), GFP_KERNEL); |
1da177e4 LT |
475 | if (!data->freq_table) { |
476 | result = -ENOMEM; | |
477 | goto err_unreg; | |
478 | } | |
479 | ||
480 | /* detect transition latency */ | |
481 | policy->cpuinfo.transition_latency = 0; | |
09b4d1ee VP |
482 | for (i=0; i<perf->state_count; i++) { |
483 | if ((perf->states[i].transition_latency * 1000) > policy->cpuinfo.transition_latency) | |
484 | policy->cpuinfo.transition_latency = perf->states[i].transition_latency * 1000; | |
1da177e4 LT |
485 | } |
486 | policy->governor = CPUFREQ_DEFAULT_GOVERNOR; | |
487 | ||
488 | /* The current speed is unknown and not detectable by ACPI... */ | |
489 | policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu); | |
490 | ||
491 | /* table init */ | |
fe27cb35 | 492 | for (i=0; i<perf->state_count; i++) |
1da177e4 | 493 | { |
fe27cb35 VP |
494 | if ( i > 0 && perf->states[i].core_frequency == |
495 | perf->states[i - 1].core_frequency) | |
496 | continue; | |
497 | ||
498 | data->freq_table[valid_states].index = i; | |
499 | data->freq_table[valid_states].frequency = | |
500 | perf->states[i].core_frequency * 1000; | |
501 | valid_states++; | |
1da177e4 | 502 | } |
fe27cb35 | 503 | data->freq_table[perf->state_count].frequency = CPUFREQ_TABLE_END; |
1da177e4 LT |
504 | |
505 | result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table); | |
506 | if (result) { | |
507 | goto err_freqfree; | |
508 | } | |
509 | ||
510 | /* notify BIOS that we exist */ | |
511 | acpi_processor_notify_smm(THIS_MODULE); | |
512 | ||
fe27cb35 | 513 | dprintk("CPU%u - ACPI performance management activated.\n", cpu); |
09b4d1ee | 514 | for (i = 0; i < perf->state_count; i++) |
1da177e4 | 515 | dprintk(" %cP%d: %d MHz, %d mW, %d uS\n", |
09b4d1ee VP |
516 | (i == perf->state?'*':' '), i, |
517 | (u32) perf->states[i].core_frequency, | |
518 | (u32) perf->states[i].power, | |
519 | (u32) perf->states[i].transition_latency); | |
1da177e4 LT |
520 | |
521 | cpufreq_frequency_table_get_attr(data->freq_table, policy->cpu); | |
4b31e774 DB |
522 | |
523 | /* | |
524 | * the first call to ->target() should result in us actually | |
525 | * writing something to the appropriate registers. | |
526 | */ | |
527 | data->resume = 1; | |
528 | ||
fe27cb35 | 529 | return result; |
1da177e4 LT |
530 | |
531 | err_freqfree: | |
532 | kfree(data->freq_table); | |
533 | err_unreg: | |
09b4d1ee | 534 | acpi_processor_unregister_performance(perf, cpu); |
1da177e4 LT |
535 | err_free: |
536 | kfree(data); | |
fe27cb35 | 537 | drv_data[cpu] = NULL; |
1da177e4 LT |
538 | |
539 | return (result); | |
540 | } | |
541 | ||
542 | ||
543 | static int | |
544 | acpi_cpufreq_cpu_exit ( | |
545 | struct cpufreq_policy *policy) | |
546 | { | |
fe27cb35 | 547 | struct acpi_cpufreq_data *data = drv_data[policy->cpu]; |
1da177e4 LT |
548 | |
549 | ||
550 | dprintk("acpi_cpufreq_cpu_exit\n"); | |
551 | ||
552 | if (data) { | |
553 | cpufreq_frequency_table_put_attr(policy->cpu); | |
fe27cb35 | 554 | drv_data[policy->cpu] = NULL; |
09b4d1ee | 555 | acpi_processor_unregister_performance(data->acpi_data, policy->cpu); |
1da177e4 LT |
556 | kfree(data); |
557 | } | |
558 | ||
559 | return (0); | |
560 | } | |
561 | ||
562 | static int | |
563 | acpi_cpufreq_resume ( | |
564 | struct cpufreq_policy *policy) | |
565 | { | |
fe27cb35 | 566 | struct acpi_cpufreq_data *data = drv_data[policy->cpu]; |
1da177e4 LT |
567 | |
568 | ||
569 | dprintk("acpi_cpufreq_resume\n"); | |
570 | ||
571 | data->resume = 1; | |
572 | ||
573 | return (0); | |
574 | } | |
575 | ||
576 | ||
577 | static struct freq_attr* acpi_cpufreq_attr[] = { | |
578 | &cpufreq_freq_attr_scaling_available_freqs, | |
579 | NULL, | |
580 | }; | |
581 | ||
582 | static struct cpufreq_driver acpi_cpufreq_driver = { | |
911cb74b DJ |
583 | .verify = acpi_cpufreq_verify, |
584 | .target = acpi_cpufreq_target, | |
fe27cb35 | 585 | .get = get_cur_freq_on_cpu, |
911cb74b DJ |
586 | .init = acpi_cpufreq_cpu_init, |
587 | .exit = acpi_cpufreq_cpu_exit, | |
588 | .resume = acpi_cpufreq_resume, | |
589 | .name = "acpi-cpufreq", | |
590 | .owner = THIS_MODULE, | |
591 | .attr = acpi_cpufreq_attr, | |
1da177e4 LT |
592 | }; |
593 | ||
594 | ||
595 | static int __init | |
596 | acpi_cpufreq_init (void) | |
597 | { | |
1da177e4 LT |
598 | dprintk("acpi_cpufreq_init\n"); |
599 | ||
fe27cb35 | 600 | acpi_cpufreq_early_init(); |
09b4d1ee | 601 | |
bfeeb0f5 | 602 | return cpufreq_register_driver(&acpi_cpufreq_driver); |
1da177e4 LT |
603 | } |
604 | ||
605 | ||
606 | static void __exit | |
607 | acpi_cpufreq_exit (void) | |
608 | { | |
09b4d1ee | 609 | unsigned int i; |
1da177e4 LT |
610 | dprintk("acpi_cpufreq_exit\n"); |
611 | ||
612 | cpufreq_unregister_driver(&acpi_cpufreq_driver); | |
613 | ||
fb1bb34d | 614 | for_each_possible_cpu(i) { |
09b4d1ee VP |
615 | kfree(acpi_perf_data[i]); |
616 | acpi_perf_data[i] = NULL; | |
617 | } | |
1da177e4 LT |
618 | return; |
619 | } | |
620 | ||
d395bf12 VP |
621 | module_param(acpi_pstate_strict, uint, 0644); |
622 | MODULE_PARM_DESC(acpi_pstate_strict, "value 0 or non-zero. non-zero -> strict ACPI checks are performed during frequency changes."); | |
1da177e4 LT |
623 | |
624 | late_initcall(acpi_cpufreq_init); | |
625 | module_exit(acpi_cpufreq_exit); | |
626 | ||
627 | MODULE_ALIAS("acpi"); |