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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -07002 * acpi-cpufreq.c - ACPI Processor P-States Driver ($Revision: 1.4 $)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
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>
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -07007 * Copyright (C) 2006 Denis Sadykov <denis.m.sadykov@intel.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/kernel.h>
29#include <linux/module.h>
30#include <linux/init.h>
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -070031#include <linux/smp.h>
32#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <linux/cpufreq.h>
Venkatesh Pallipadid395bf12005-08-25 15:59:00 -040034#include <linux/compiler.h>
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -070035#include <linux/dmi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
37#include <linux/acpi.h>
38#include <acpi/processor.h>
39
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -070040#include <asm/io.h>
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -070041#include <asm/msr.h>
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -070042#include <asm/processor.h>
43#include <asm/cpufeature.h>
44#include <asm/delay.h>
45#include <asm/uaccess.h>
46
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "acpi-cpufreq", msg)
48
49MODULE_AUTHOR("Paul Diefenbaugh, Dominik Brodowski");
50MODULE_DESCRIPTION("ACPI Processor P-States Driver");
51MODULE_LICENSE("GPL");
52
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -070053enum {
54 UNDEFINED_CAPABLE = 0,
55 SYSTEM_INTEL_MSR_CAPABLE,
56 SYSTEM_IO_CAPABLE,
57};
58
59#define INTEL_MSR_RANGE (0xffff)
Venkatesh Pallipadidfde5d62006-10-03 12:38:45 -070060#define CPUID_6_ECX_APERFMPERF_CAPABILITY (0x1)
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -070061
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -070062struct acpi_cpufreq_data {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -070063 struct acpi_processor_performance *acpi_data;
64 struct cpufreq_frequency_table *freq_table;
Venkatesh Pallipadidfde5d62006-10-03 12:38:45 -070065 unsigned int max_freq;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -070066 unsigned int resume;
67 unsigned int cpu_feature;
Linus Torvalds1da177e2005-04-16 15:20:36 -070068};
69
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -070070static struct acpi_cpufreq_data *drv_data[NR_CPUS];
71static struct acpi_processor_performance *acpi_perf_data[NR_CPUS];
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
73static struct cpufreq_driver acpi_cpufreq_driver;
74
Venkatesh Pallipadid395bf12005-08-25 15:59:00 -040075static unsigned int acpi_pstate_strict;
76
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -070077static int check_est_cpu(unsigned int cpuid)
78{
79 struct cpuinfo_x86 *cpu = &cpu_data[cpuid];
80
81 if (cpu->x86_vendor != X86_VENDOR_INTEL ||
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -070082 !cpu_has(cpu, X86_FEATURE_EST))
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -070083 return 0;
84
85 return 1;
86}
87
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -070088static unsigned extract_io(u32 value, struct acpi_cpufreq_data *data)
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -070089{
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -070090 struct acpi_processor_performance *perf;
91 int i;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -070092
93 perf = data->acpi_data;
94
Dave Jones95dd7222006-10-18 00:41:48 -040095 for (i=0; i<perf->state_count; i++) {
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -070096 if (value == perf->states[i].status)
97 return data->freq_table[i].frequency;
98 }
99 return 0;
100}
101
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700102static unsigned extract_msr(u32 msr, struct acpi_cpufreq_data *data)
103{
104 int i;
Venkatesh Pallipadia6f6e6e62006-10-03 12:37:42 -0700105 struct acpi_processor_performance *perf;
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700106
107 msr &= INTEL_MSR_RANGE;
Venkatesh Pallipadia6f6e6e62006-10-03 12:37:42 -0700108 perf = data->acpi_data;
109
Dave Jones95dd7222006-10-18 00:41:48 -0400110 for (i=0; data->freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
Venkatesh Pallipadia6f6e6e62006-10-03 12:37:42 -0700111 if (msr == perf->states[data->freq_table[i].index].status)
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700112 return data->freq_table[i].frequency;
113 }
114 return data->freq_table[0].frequency;
115}
116
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700117static unsigned extract_freq(u32 val, struct acpi_cpufreq_data *data)
118{
119 switch (data->cpu_feature) {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700120 case SYSTEM_INTEL_MSR_CAPABLE:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700121 return extract_msr(val, data);
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700122 case SYSTEM_IO_CAPABLE:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700123 return extract_io(val, data);
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700124 default:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700125 return 0;
126 }
127}
128
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700129struct msr_addr {
130 u32 reg;
131};
132
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700133struct io_addr {
134 u16 port;
135 u8 bit_width;
136};
137
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700138typedef union {
139 struct msr_addr msr;
140 struct io_addr io;
141} drv_addr_union;
142
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700143struct drv_cmd {
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700144 unsigned int type;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700145 cpumask_t mask;
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700146 drv_addr_union addr;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700147 u32 val;
148};
149
150static void do_drv_read(struct drv_cmd *cmd)
151{
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700152 u32 h;
153
154 switch (cmd->type) {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700155 case SYSTEM_INTEL_MSR_CAPABLE:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700156 rdmsr(cmd->addr.msr.reg, cmd->val, h);
157 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700158 case SYSTEM_IO_CAPABLE:
Venkatesh Pallipadi4e581ff2006-12-13 10:41:16 -0800159 acpi_os_read_port((acpi_io_address)cmd->addr.io.port,
160 &cmd->val,
161 (u32)cmd->addr.io.bit_width);
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700162 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700163 default:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700164 break;
165 }
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700166}
167
168static void do_drv_write(struct drv_cmd *cmd)
169{
Venki Pallipadi13424f62007-05-23 15:42:13 -0700170 u32 lo, hi;
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700171
172 switch (cmd->type) {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700173 case SYSTEM_INTEL_MSR_CAPABLE:
Venki Pallipadi13424f62007-05-23 15:42:13 -0700174 rdmsr(cmd->addr.msr.reg, lo, hi);
175 lo = (lo & ~INTEL_MSR_RANGE) | (cmd->val & INTEL_MSR_RANGE);
176 wrmsr(cmd->addr.msr.reg, lo, hi);
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700177 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700178 case SYSTEM_IO_CAPABLE:
Venkatesh Pallipadi4e581ff2006-12-13 10:41:16 -0800179 acpi_os_write_port((acpi_io_address)cmd->addr.io.port,
180 cmd->val,
181 (u32)cmd->addr.io.bit_width);
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700182 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700183 default:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700184 break;
185 }
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700186}
187
Dave Jones95dd7222006-10-18 00:41:48 -0400188static void drv_read(struct drv_cmd *cmd)
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700189{
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700190 cpumask_t saved_mask = current->cpus_allowed;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700191 cmd->val = 0;
192
193 set_cpus_allowed(current, cmd->mask);
194 do_drv_read(cmd);
195 set_cpus_allowed(current, saved_mask);
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700196}
197
198static void drv_write(struct drv_cmd *cmd)
199{
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700200 cpumask_t saved_mask = current->cpus_allowed;
201 unsigned int i;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700202
203 for_each_cpu_mask(i, cmd->mask) {
204 set_cpus_allowed(current, cpumask_of_cpu(i));
205 do_drv_write(cmd);
206 }
207
208 set_cpus_allowed(current, saved_mask);
209 return;
210}
211
212static u32 get_cur_val(cpumask_t mask)
213{
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700214 struct acpi_processor_performance *perf;
215 struct drv_cmd cmd;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700216
217 if (unlikely(cpus_empty(mask)))
218 return 0;
219
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700220 switch (drv_data[first_cpu(mask)]->cpu_feature) {
221 case SYSTEM_INTEL_MSR_CAPABLE:
222 cmd.type = SYSTEM_INTEL_MSR_CAPABLE;
223 cmd.addr.msr.reg = MSR_IA32_PERF_STATUS;
224 break;
225 case SYSTEM_IO_CAPABLE:
226 cmd.type = SYSTEM_IO_CAPABLE;
227 perf = drv_data[first_cpu(mask)]->acpi_data;
228 cmd.addr.io.port = perf->control_register.address;
229 cmd.addr.io.bit_width = perf->control_register.bit_width;
230 break;
231 default:
232 return 0;
233 }
234
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700235 cmd.mask = mask;
236
237 drv_read(&cmd);
238
239 dprintk("get_cur_val = %u\n", cmd.val);
240
241 return cmd.val;
242}
243
Venkatesh Pallipadidfde5d62006-10-03 12:38:45 -0700244/*
245 * Return the measured active (C0) frequency on this CPU since last call
246 * to this function.
247 * Input: cpu number
248 * Return: Average CPU frequency in terms of max frequency (zero on error)
249 *
250 * We use IA32_MPERF and IA32_APERF MSRs to get the measured performance
251 * over a period of time, while CPU is in C0 state.
252 * IA32_MPERF counts at the rate of max advertised frequency
253 * IA32_APERF counts at the rate of actual CPU frequency
254 * Only IA32_APERF/IA32_MPERF ratio is architecturally defined and
255 * no meaning should be associated with absolute values of these MSRs.
256 */
257static unsigned int get_measured_perf(unsigned int cpu)
258{
259 union {
260 struct {
261 u32 lo;
262 u32 hi;
263 } split;
264 u64 whole;
265 } aperf_cur, mperf_cur;
266
267 cpumask_t saved_mask;
268 unsigned int perf_percent;
269 unsigned int retval;
270
271 saved_mask = current->cpus_allowed;
272 set_cpus_allowed(current, cpumask_of_cpu(cpu));
273 if (get_cpu() != cpu) {
274 /* We were not able to run on requested processor */
275 put_cpu();
276 return 0;
277 }
278
279 rdmsr(MSR_IA32_APERF, aperf_cur.split.lo, aperf_cur.split.hi);
280 rdmsr(MSR_IA32_MPERF, mperf_cur.split.lo, mperf_cur.split.hi);
281
282 wrmsr(MSR_IA32_APERF, 0,0);
283 wrmsr(MSR_IA32_MPERF, 0,0);
284
285#ifdef __i386__
286 /*
287 * We dont want to do 64 bit divide with 32 bit kernel
288 * Get an approximate value. Return failure in case we cannot get
289 * an approximate value.
290 */
291 if (unlikely(aperf_cur.split.hi || mperf_cur.split.hi)) {
292 int shift_count;
293 u32 h;
294
295 h = max_t(u32, aperf_cur.split.hi, mperf_cur.split.hi);
296 shift_count = fls(h);
297
298 aperf_cur.whole >>= shift_count;
299 mperf_cur.whole >>= shift_count;
300 }
301
302 if (((unsigned long)(-1) / 100) < aperf_cur.split.lo) {
303 int shift_count = 7;
304 aperf_cur.split.lo >>= shift_count;
305 mperf_cur.split.lo >>= shift_count;
306 }
307
Dave Jones95dd7222006-10-18 00:41:48 -0400308 if (aperf_cur.split.lo && mperf_cur.split.lo)
Venkatesh Pallipadidfde5d62006-10-03 12:38:45 -0700309 perf_percent = (aperf_cur.split.lo * 100) / mperf_cur.split.lo;
Dave Jones95dd7222006-10-18 00:41:48 -0400310 else
Venkatesh Pallipadidfde5d62006-10-03 12:38:45 -0700311 perf_percent = 0;
Venkatesh Pallipadidfde5d62006-10-03 12:38:45 -0700312
313#else
314 if (unlikely(((unsigned long)(-1) / 100) < aperf_cur.whole)) {
315 int shift_count = 7;
316 aperf_cur.whole >>= shift_count;
317 mperf_cur.whole >>= shift_count;
318 }
319
Dave Jones95dd7222006-10-18 00:41:48 -0400320 if (aperf_cur.whole && mperf_cur.whole)
Venkatesh Pallipadidfde5d62006-10-03 12:38:45 -0700321 perf_percent = (aperf_cur.whole * 100) / mperf_cur.whole;
Dave Jones95dd7222006-10-18 00:41:48 -0400322 else
Venkatesh Pallipadidfde5d62006-10-03 12:38:45 -0700323 perf_percent = 0;
Venkatesh Pallipadidfde5d62006-10-03 12:38:45 -0700324
325#endif
326
327 retval = drv_data[cpu]->max_freq * perf_percent / 100;
328
329 put_cpu();
330 set_cpus_allowed(current, saved_mask);
331
332 dprintk("cpu %d: performance percent %d\n", cpu, perf_percent);
333 return retval;
334}
335
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700336static unsigned int get_cur_freq_on_cpu(unsigned int cpu)
337{
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700338 struct acpi_cpufreq_data *data = drv_data[cpu];
339 unsigned int freq;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700340
341 dprintk("get_cur_freq_on_cpu (%d)\n", cpu);
342
343 if (unlikely(data == NULL ||
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700344 data->acpi_data == NULL || data->freq_table == NULL)) {
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700345 return 0;
346 }
347
348 freq = extract_freq(get_cur_val(cpumask_of_cpu(cpu)), data);
349 dprintk("cur freq = %u\n", freq);
350
351 return freq;
352}
353
354static unsigned int check_freqs(cpumask_t mask, unsigned int freq,
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700355 struct acpi_cpufreq_data *data)
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700356{
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700357 unsigned int cur_freq;
358 unsigned int i;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700359
Dave Jones95dd7222006-10-18 00:41:48 -0400360 for (i=0; i<100; i++) {
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700361 cur_freq = extract_freq(get_cur_val(mask), data);
362 if (cur_freq == freq)
363 return 1;
364 udelay(10);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 }
366 return 0;
367}
368
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700369static int acpi_cpufreq_target(struct cpufreq_policy *policy,
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700370 unsigned int target_freq, unsigned int relation)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371{
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700372 struct acpi_cpufreq_data *data = drv_data[policy->cpu];
373 struct acpi_processor_performance *perf;
374 struct cpufreq_freqs freqs;
375 cpumask_t online_policy_cpus;
376 struct drv_cmd cmd;
Venkatesh Pallipadi8edc59d92006-12-19 12:58:55 -0800377 unsigned int next_state = 0; /* Index into freq_table */
378 unsigned int next_perf_state = 0; /* Index into perf table */
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700379 unsigned int i;
380 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700382 dprintk("acpi_cpufreq_target %d (%d)\n", target_freq, policy->cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700384 if (unlikely(data == NULL ||
Dave Jones95dd7222006-10-18 00:41:48 -0400385 data->acpi_data == NULL || data->freq_table == NULL)) {
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700386 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 }
388
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500389 perf = data->acpi_data;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700390 result = cpufreq_frequency_table_target(policy,
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700391 data->freq_table,
392 target_freq,
393 relation, &next_state);
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700394 if (unlikely(result))
395 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396
Andrew Morton7e1f19e2006-03-28 17:03:00 -0500397#ifdef CONFIG_HOTPLUG_CPU
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500398 /* cpufreq holds the hotplug lock, so we are safe from here on */
399 cpus_and(online_policy_cpus, cpu_online_map, policy->cpus);
Andrew Morton7e1f19e2006-03-28 17:03:00 -0500400#else
401 online_policy_cpus = policy->cpus;
402#endif
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500403
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700404 next_perf_state = data->freq_table[next_state].index;
Venkatesh Pallipadi7650b282006-10-03 12:36:30 -0700405 if (perf->state == next_perf_state) {
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700406 if (unlikely(data->resume)) {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700407 dprintk("Called after resume, resetting to P%d\n",
408 next_perf_state);
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700409 data->resume = 0;
410 } else {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700411 dprintk("Already at target state (P%d)\n",
412 next_perf_state);
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700413 return 0;
414 }
415 }
416
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700417 switch (data->cpu_feature) {
418 case SYSTEM_INTEL_MSR_CAPABLE:
419 cmd.type = SYSTEM_INTEL_MSR_CAPABLE;
420 cmd.addr.msr.reg = MSR_IA32_PERF_CTL;
Venki Pallipadi13424f62007-05-23 15:42:13 -0700421 cmd.val = (u32) perf->states[next_perf_state].control;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700422 break;
423 case SYSTEM_IO_CAPABLE:
424 cmd.type = SYSTEM_IO_CAPABLE;
425 cmd.addr.io.port = perf->control_register.address;
426 cmd.addr.io.bit_width = perf->control_register.bit_width;
427 cmd.val = (u32) perf->states[next_perf_state].control;
428 break;
429 default:
430 return -ENODEV;
431 }
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700432
433 cpus_clear(cmd.mask);
434
435 if (policy->shared_type != CPUFREQ_SHARED_TYPE_ANY)
436 cmd.mask = online_policy_cpus;
437 else
438 cpu_set(policy->cpu, cmd.mask);
439
Venkatesh Pallipadi8edc59d92006-12-19 12:58:55 -0800440 freqs.old = perf->states[perf->state].core_frequency * 1000;
441 freqs.new = data->freq_table[next_state].frequency;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700442 for_each_cpu_mask(i, cmd.mask) {
443 freqs.cpu = i;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500444 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
445 }
446
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700447 drv_write(&cmd);
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500448
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700449 if (acpi_pstate_strict) {
450 if (!check_freqs(cmd.mask, freqs.new, data)) {
451 dprintk("acpi_cpufreq_target failed (%d)\n",
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700452 policy->cpu);
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700453 return -EAGAIN;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500454 }
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500455 }
456
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700457 for_each_cpu_mask(i, cmd.mask) {
458 freqs.cpu = i;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500459 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
460 }
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700461 perf->state = next_perf_state;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500462
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700463 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464}
465
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700466static int acpi_cpufreq_verify(struct cpufreq_policy *policy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467{
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700468 struct acpi_cpufreq_data *data = drv_data[policy->cpu];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469
470 dprintk("acpi_cpufreq_verify\n");
471
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700472 return cpufreq_frequency_table_verify(policy, data->freq_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473}
474
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475static unsigned long
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700476acpi_cpufreq_guess_freq(struct acpi_cpufreq_data *data, unsigned int cpu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477{
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700478 struct acpi_processor_performance *perf = data->acpi_data;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500479
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 if (cpu_khz) {
481 /* search the closest match to cpu_khz */
482 unsigned int i;
483 unsigned long freq;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500484 unsigned long freqn = perf->states[0].core_frequency * 1000;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
Dave Jones95dd7222006-10-18 00:41:48 -0400486 for (i=0; i<(perf->state_count-1); i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 freq = freqn;
Dave Jones95dd7222006-10-18 00:41:48 -0400488 freqn = perf->states[i+1].core_frequency * 1000;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 if ((2 * cpu_khz) > (freqn + freq)) {
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500490 perf->state = i;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700491 return freq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 }
493 }
Dave Jones95dd7222006-10-18 00:41:48 -0400494 perf->state = perf->state_count-1;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700495 return freqn;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500496 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 /* assume CPU is at P0... */
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500498 perf->state = 0;
499 return perf->states[0].core_frequency * 1000;
500 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501}
502
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500503/*
504 * acpi_cpufreq_early_init - initialize ACPI P-States library
505 *
506 * Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c)
507 * in order to determine correct frequency and voltage pairings. We can
508 * do _PDC and _PSD and find out the processor dependency for the
509 * actual init that will happen later...
510 */
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700511static int acpi_cpufreq_early_init(void)
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500512{
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700513 struct acpi_processor_performance *data;
514 cpumask_t covered;
515 unsigned int i, j;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500516
517 dprintk("acpi_cpufreq_early_init\n");
518
Andrew Mortonfb1bb342006-06-25 05:46:43 -0700519 for_each_possible_cpu(i) {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700520 data = kzalloc(sizeof(struct acpi_processor_performance),
521 GFP_KERNEL);
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500522 if (!data) {
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700523 for_each_cpu_mask(j, covered) {
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500524 kfree(acpi_perf_data[j]);
525 acpi_perf_data[j] = NULL;
526 }
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700527 return -ENOMEM;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500528 }
529 acpi_perf_data[i] = data;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700530 cpu_set(i, covered);
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500531 }
532
533 /* Do initialization in ACPI core */
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700534 acpi_processor_preregister_performance(acpi_perf_data);
535 return 0;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500536}
537
Dave Jones95625b82006-10-21 01:37:39 -0400538#ifdef CONFIG_SMP
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700539/*
540 * Some BIOSes do SW_ANY coordination internally, either set it up in hw
541 * or do it in BIOS firmware and won't inform about it to OS. If not
542 * detected, this has a side effect of making CPU run at a different speed
543 * than OS intended it to run at. Detect it and handle it cleanly.
544 */
545static int bios_with_sw_any_bug;
546
Venkatesh Pallipadi0497c8c2006-09-25 11:23:32 -0700547static int sw_any_bug_found(struct dmi_system_id *d)
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700548{
549 bios_with_sw_any_bug = 1;
550 return 0;
551}
552
Venkatesh Pallipadi0497c8c2006-09-25 11:23:32 -0700553static struct dmi_system_id sw_any_bug_dmi_table[] = {
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700554 {
555 .callback = sw_any_bug_found,
556 .ident = "Supermicro Server X6DLP",
557 .matches = {
558 DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
559 DMI_MATCH(DMI_BIOS_VERSION, "080010"),
560 DMI_MATCH(DMI_PRODUCT_NAME, "X6DLP"),
561 },
562 },
563 { }
564};
Dave Jones95625b82006-10-21 01:37:39 -0400565#endif
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700566
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700567static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568{
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700569 unsigned int i;
570 unsigned int valid_states = 0;
571 unsigned int cpu = policy->cpu;
572 struct acpi_cpufreq_data *data;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700573 unsigned int result = 0;
574 struct cpuinfo_x86 *c = &cpu_data[policy->cpu];
575 struct acpi_processor_performance *perf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 dprintk("acpi_cpufreq_cpu_init\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500579 if (!acpi_perf_data[cpu])
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700580 return -ENODEV;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500581
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700582 data = kzalloc(sizeof(struct acpi_cpufreq_data), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 if (!data)
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700584 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500586 data->acpi_data = acpi_perf_data[cpu];
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700587 drv_data[cpu] = data;
588
Dave Jones95dd7222006-10-18 00:41:48 -0400589 if (cpu_has(c, X86_FEATURE_CONSTANT_TSC))
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700590 acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500592 result = acpi_processor_register_performance(data->acpi_data, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 if (result)
594 goto err_free;
595
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500596 perf = data->acpi_data;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500597 policy->shared_type = perf->shared_type;
Dave Jones95dd7222006-10-18 00:41:48 -0400598
Venkatesh Pallipadi46f18e32006-06-26 00:34:43 -0400599 /*
Dave Jones95dd7222006-10-18 00:41:48 -0400600 * Will let policy->cpus know about dependency only when software
Venkatesh Pallipadi46f18e32006-06-26 00:34:43 -0400601 * coordination is required.
602 */
603 if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL ||
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700604 policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) {
Venkatesh Pallipadi46f18e32006-06-26 00:34:43 -0400605 policy->cpus = perf->shared_cpu_map;
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700606 }
607
608#ifdef CONFIG_SMP
609 dmi_check_system(sw_any_bug_dmi_table);
610 if (bios_with_sw_any_bug && cpus_weight(policy->cpus) == 1) {
611 policy->shared_type = CPUFREQ_SHARED_TYPE_ALL;
612 policy->cpus = cpu_core_map[cpu];
613 }
614#endif
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500615
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 /* capability check */
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500617 if (perf->state_count <= 1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 dprintk("No P-States\n");
619 result = -ENODEV;
620 goto err_unreg;
621 }
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500622
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700623 if (perf->control_register.space_id != perf->status_register.space_id) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 result = -ENODEV;
625 goto err_unreg;
626 }
627
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700628 switch (perf->control_register.space_id) {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700629 case ACPI_ADR_SPACE_SYSTEM_IO:
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700630 dprintk("SYSTEM IO addr space\n");
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700631 data->cpu_feature = SYSTEM_IO_CAPABLE;
632 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700633 case ACPI_ADR_SPACE_FIXED_HARDWARE:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700634 dprintk("HARDWARE addr space\n");
635 if (!check_est_cpu(cpu)) {
636 result = -ENODEV;
637 goto err_unreg;
638 }
639 data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700640 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700641 default:
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700642 dprintk("Unknown addr space %d\n",
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700643 (u32) (perf->control_register.space_id));
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700644 result = -ENODEV;
645 goto err_unreg;
646 }
647
Dave Jones95dd7222006-10-18 00:41:48 -0400648 data->freq_table = kmalloc(sizeof(struct cpufreq_frequency_table) *
649 (perf->state_count+1), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 if (!data->freq_table) {
651 result = -ENOMEM;
652 goto err_unreg;
653 }
654
655 /* detect transition latency */
656 policy->cpuinfo.transition_latency = 0;
Dave Jones95dd7222006-10-18 00:41:48 -0400657 for (i=0; i<perf->state_count; i++) {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700658 if ((perf->states[i].transition_latency * 1000) >
659 policy->cpuinfo.transition_latency)
660 policy->cpuinfo.transition_latency =
661 perf->states[i].transition_latency * 1000;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 }
663 policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
664
Venkatesh Pallipadidfde5d62006-10-03 12:38:45 -0700665 data->max_freq = perf->states[0].core_frequency * 1000;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 /* table init */
Dave Jones95dd7222006-10-18 00:41:48 -0400667 for (i=0; i<perf->state_count; i++) {
668 if (i>0 && perf->states[i].core_frequency ==
669 perf->states[i-1].core_frequency)
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700670 continue;
671
672 data->freq_table[valid_states].index = i;
673 data->freq_table[valid_states].frequency =
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700674 perf->states[i].core_frequency * 1000;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700675 valid_states++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 }
Venkatesh Pallipadi3d4a7ef2006-11-13 17:47:44 -0800677 data->freq_table[valid_states].frequency = CPUFREQ_TABLE_END;
Venkatesh Pallipadi8edc59d92006-12-19 12:58:55 -0800678 perf->state = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679
680 result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table);
Dave Jones95dd7222006-10-18 00:41:48 -0400681 if (result)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 goto err_freqfree;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683
Mattia Dongilia507ac42006-12-15 19:52:45 +0100684 switch (perf->control_register.space_id) {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700685 case ACPI_ADR_SPACE_SYSTEM_IO:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700686 /* Current speed is unknown and not detectable by IO port */
687 policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu);
688 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700689 case ACPI_ADR_SPACE_FIXED_HARDWARE:
Venkatesh Pallipadi7650b282006-10-03 12:36:30 -0700690 acpi_cpufreq_driver.get = get_cur_freq_on_cpu;
Mattia Dongilia507ac42006-12-15 19:52:45 +0100691 policy->cur = get_cur_freq_on_cpu(cpu);
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700692 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700693 default:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700694 break;
695 }
696
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 /* notify BIOS that we exist */
698 acpi_processor_notify_smm(THIS_MODULE);
699
Venkatesh Pallipadidfde5d62006-10-03 12:38:45 -0700700 /* Check for APERF/MPERF support in hardware */
701 if (c->x86_vendor == X86_VENDOR_INTEL && c->cpuid_level >= 6) {
702 unsigned int ecx;
703 ecx = cpuid_ecx(6);
Dave Jones95dd7222006-10-18 00:41:48 -0400704 if (ecx & CPUID_6_ECX_APERFMPERF_CAPABILITY)
Venkatesh Pallipadidfde5d62006-10-03 12:38:45 -0700705 acpi_cpufreq_driver.getavg = get_measured_perf;
Venkatesh Pallipadidfde5d62006-10-03 12:38:45 -0700706 }
707
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700708 dprintk("CPU%u - ACPI performance management activated.\n", cpu);
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500709 for (i = 0; i < perf->state_count; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 dprintk(" %cP%d: %d MHz, %d mW, %d uS\n",
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700711 (i == perf->state ? '*' : ' '), i,
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500712 (u32) perf->states[i].core_frequency,
713 (u32) perf->states[i].power,
714 (u32) perf->states[i].transition_latency);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715
716 cpufreq_frequency_table_get_attr(data->freq_table, policy->cpu);
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700717
Dominik Brodowski4b31e772005-05-18 13:49:00 -0400718 /*
719 * the first call to ->target() should result in us actually
720 * writing something to the appropriate registers.
721 */
722 data->resume = 1;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700723
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700724 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725
Dave Jones95dd7222006-10-18 00:41:48 -0400726err_freqfree:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 kfree(data->freq_table);
Dave Jones95dd7222006-10-18 00:41:48 -0400728err_unreg:
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500729 acpi_processor_unregister_performance(perf, cpu);
Dave Jones95dd7222006-10-18 00:41:48 -0400730err_free:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 kfree(data);
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700732 drv_data[cpu] = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700734 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735}
736
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700737static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738{
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700739 struct acpi_cpufreq_data *data = drv_data[policy->cpu];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 dprintk("acpi_cpufreq_cpu_exit\n");
742
743 if (data) {
744 cpufreq_frequency_table_put_attr(policy->cpu);
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700745 drv_data[policy->cpu] = NULL;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700746 acpi_processor_unregister_performance(data->acpi_data,
747 policy->cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 kfree(data);
749 }
750
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700751 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752}
753
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700754static int acpi_cpufreq_resume(struct cpufreq_policy *policy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755{
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700756 struct acpi_cpufreq_data *data = drv_data[policy->cpu];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 dprintk("acpi_cpufreq_resume\n");
759
760 data->resume = 1;
761
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700762 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763}
764
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700765static struct freq_attr *acpi_cpufreq_attr[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 &cpufreq_freq_attr_scaling_available_freqs,
767 NULL,
768};
769
770static struct cpufreq_driver acpi_cpufreq_driver = {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700771 .verify = acpi_cpufreq_verify,
772 .target = acpi_cpufreq_target,
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700773 .init = acpi_cpufreq_cpu_init,
774 .exit = acpi_cpufreq_cpu_exit,
775 .resume = acpi_cpufreq_resume,
776 .name = "acpi-cpufreq",
777 .owner = THIS_MODULE,
778 .attr = acpi_cpufreq_attr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779};
780
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700781static int __init acpi_cpufreq_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 dprintk("acpi_cpufreq_init\n");
784
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700785 acpi_cpufreq_early_init();
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500786
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700787 return cpufreq_register_driver(&acpi_cpufreq_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788}
789
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700790static void __exit acpi_cpufreq_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791{
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700792 unsigned int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 dprintk("acpi_cpufreq_exit\n");
794
795 cpufreq_unregister_driver(&acpi_cpufreq_driver);
796
Andrew Mortonfb1bb342006-06-25 05:46:43 -0700797 for_each_possible_cpu(i) {
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500798 kfree(acpi_perf_data[i]);
799 acpi_perf_data[i] = NULL;
800 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 return;
802}
803
Venkatesh Pallipadid395bf12005-08-25 15:59:00 -0400804module_param(acpi_pstate_strict, uint, 0644);
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700805MODULE_PARM_DESC(acpi_pstate_strict,
Dave Jones95dd7222006-10-18 00:41:48 -0400806 "value 0 or non-zero. non-zero -> strict ACPI checks are "
807 "performed during frequency changes.");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808
809late_initcall(acpi_cpufreq_init);
810module_exit(acpi_cpufreq_exit);
811
812MODULE_ALIAS("acpi");