blob: b0c18ed8d83f707d000213e458dba613e4ffaf96 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Dave Jones3a58df32009-01-17 22:36:14 -05002 * acpi-cpufreq.c - ACPI Processor P-States Driver
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090036#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
38#include <linux/acpi.h>
Dave Jones3a58df32009-01-17 22:36:14 -050039#include <linux/io.h>
40#include <linux/delay.h>
41#include <linux/uaccess.h>
42
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <acpi/processor.h>
44
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -070045#include <asm/msr.h>
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -070046#include <asm/processor.h>
47#include <asm/cpufeature.h>
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -070048
Linus Torvalds1da177e2005-04-16 15:20:36 -070049MODULE_AUTHOR("Paul Diefenbaugh, Dominik Brodowski");
50MODULE_DESCRIPTION("ACPI Processor P-States Driver");
51MODULE_LICENSE("GPL");
52
Andre Przywaraacd31622012-09-04 08:28:03 +000053#define PFX "acpi-cpufreq: "
54
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -070055enum {
56 UNDEFINED_CAPABLE = 0,
57 SYSTEM_INTEL_MSR_CAPABLE,
Matthew Garrett3dc9a632012-09-04 08:28:02 +000058 SYSTEM_AMD_MSR_CAPABLE,
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -070059 SYSTEM_IO_CAPABLE,
60};
61
62#define INTEL_MSR_RANGE (0xffff)
Matthew Garrett3dc9a632012-09-04 08:28:02 +000063#define AMD_MSR_RANGE (0x7)
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -070064
Andre Przywara615b7302012-09-04 08:28:07 +000065#define MSR_K7_HWCR_CPB_DIS (1ULL << 25)
66
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -070067struct acpi_cpufreq_data {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -070068 struct acpi_processor_performance *acpi_data;
69 struct cpufreq_frequency_table *freq_table;
70 unsigned int resume;
71 unsigned int cpu_feature;
Lan Tianyuf4fd3792013-06-27 15:08:54 +080072 cpumask_var_t freqdomain_cpus;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073};
74
Tejun Heof1625062009-10-29 22:34:13 +090075static DEFINE_PER_CPU(struct acpi_cpufreq_data *, acfreq_data);
travis@sgi.comea348f32008-01-30 13:33:12 +010076
Fenghua Yu50109292007-08-07 18:40:30 -040077/* acpi_perf_data is a pointer to percpu data. */
Namhyung Kim3f6c4df2010-08-13 23:00:11 +090078static struct acpi_processor_performance __percpu *acpi_perf_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
80static struct cpufreq_driver acpi_cpufreq_driver;
81
Venkatesh Pallipadid395bf12005-08-25 15:59:00 -040082static unsigned int acpi_pstate_strict;
Andre Przywara615b7302012-09-04 08:28:07 +000083static struct msr __percpu *msrs;
84
85static bool boost_state(unsigned int cpu)
86{
87 u32 lo, hi;
88 u64 msr;
89
90 switch (boot_cpu_data.x86_vendor) {
91 case X86_VENDOR_INTEL:
92 rdmsr_on_cpu(cpu, MSR_IA32_MISC_ENABLE, &lo, &hi);
93 msr = lo | ((u64)hi << 32);
94 return !(msr & MSR_IA32_MISC_ENABLE_TURBO_DISABLE);
95 case X86_VENDOR_AMD:
96 rdmsr_on_cpu(cpu, MSR_K7_HWCR, &lo, &hi);
97 msr = lo | ((u64)hi << 32);
98 return !(msr & MSR_K7_HWCR_CPB_DIS);
99 }
100 return false;
101}
102
103static void boost_set_msrs(bool enable, const struct cpumask *cpumask)
104{
105 u32 cpu;
106 u32 msr_addr;
107 u64 msr_mask;
108
109 switch (boot_cpu_data.x86_vendor) {
110 case X86_VENDOR_INTEL:
111 msr_addr = MSR_IA32_MISC_ENABLE;
112 msr_mask = MSR_IA32_MISC_ENABLE_TURBO_DISABLE;
113 break;
114 case X86_VENDOR_AMD:
115 msr_addr = MSR_K7_HWCR;
116 msr_mask = MSR_K7_HWCR_CPB_DIS;
117 break;
118 default:
119 return;
120 }
121
122 rdmsr_on_cpus(cpumask, msr_addr, msrs);
123
124 for_each_cpu(cpu, cpumask) {
125 struct msr *reg = per_cpu_ptr(msrs, cpu);
126 if (enable)
127 reg->q &= ~msr_mask;
128 else
129 reg->q |= msr_mask;
130 }
131
132 wrmsr_on_cpus(cpumask, msr_addr, msrs);
133}
134
Lukasz Majewskicfc9c8e2013-12-20 15:24:50 +0100135static int _store_boost(int val)
Andre Przywara615b7302012-09-04 08:28:07 +0000136{
Andre Przywara615b7302012-09-04 08:28:07 +0000137 get_online_cpus();
Andre Przywara615b7302012-09-04 08:28:07 +0000138 boost_set_msrs(val, cpu_online_mask);
Andre Przywara615b7302012-09-04 08:28:07 +0000139 put_online_cpus();
Andre Przywara615b7302012-09-04 08:28:07 +0000140 pr_debug("Core Boosting %sabled.\n", val ? "en" : "dis");
141
Lukasz Majewskicfc9c8e2013-12-20 15:24:50 +0100142 return 0;
Andre Przywara615b7302012-09-04 08:28:07 +0000143}
144
Lan Tianyuf4fd3792013-06-27 15:08:54 +0800145static ssize_t show_freqdomain_cpus(struct cpufreq_policy *policy, char *buf)
146{
147 struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
148
149 return cpufreq_show_cpus(data->freqdomain_cpus, buf);
150}
151
152cpufreq_freq_attr_ro(freqdomain_cpus);
153
Andre Przywara11269ff2012-09-04 08:28:08 +0000154#ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
Lukasz Majewskicfc9c8e2013-12-20 15:24:50 +0100155static ssize_t store_boost(const char *buf, size_t count)
156{
157 int ret;
158 unsigned long val = 0;
159
160 if (!acpi_cpufreq_driver.boost_supported)
161 return -EINVAL;
162
163 ret = kstrtoul(buf, 10, &val);
164 if (ret || (val > 1))
165 return -EINVAL;
166
167 _store_boost((int) val);
168
169 return count;
170}
171
Andre Przywara11269ff2012-09-04 08:28:08 +0000172static ssize_t store_cpb(struct cpufreq_policy *policy, const char *buf,
173 size_t count)
174{
Lukasz Majewskicfc9c8e2013-12-20 15:24:50 +0100175 return store_boost(buf, count);
Andre Przywara11269ff2012-09-04 08:28:08 +0000176}
177
178static ssize_t show_cpb(struct cpufreq_policy *policy, char *buf)
179{
Lukasz Majewskicfc9c8e2013-12-20 15:24:50 +0100180 return sprintf(buf, "%u\n", acpi_cpufreq_driver.boost_enabled);
Andre Przywara11269ff2012-09-04 08:28:08 +0000181}
182
Lan Tianyu59027d32013-08-13 10:05:53 +0800183cpufreq_freq_attr_rw(cpb);
Andre Przywara11269ff2012-09-04 08:28:08 +0000184#endif
185
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700186static int check_est_cpu(unsigned int cpuid)
187{
Mike Travis92cb7612007-10-19 20:35:04 +0200188 struct cpuinfo_x86 *cpu = &cpu_data(cpuid);
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700189
Harald Welte0de51082009-06-08 18:27:54 +0800190 return cpu_has(cpu, X86_FEATURE_EST);
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700191}
192
Matthew Garrett3dc9a632012-09-04 08:28:02 +0000193static int check_amd_hwpstate_cpu(unsigned int cpuid)
194{
195 struct cpuinfo_x86 *cpu = &cpu_data(cpuid);
196
197 return cpu_has(cpu, X86_FEATURE_HW_PSTATE);
198}
199
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700200static unsigned extract_io(u32 value, struct acpi_cpufreq_data *data)
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700201{
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700202 struct acpi_processor_performance *perf;
203 int i;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700204
205 perf = data->acpi_data;
206
Dave Jones3a58df32009-01-17 22:36:14 -0500207 for (i = 0; i < perf->state_count; i++) {
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700208 if (value == perf->states[i].status)
209 return data->freq_table[i].frequency;
210 }
211 return 0;
212}
213
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700214static unsigned extract_msr(u32 msr, struct acpi_cpufreq_data *data)
215{
Stratos Karafotis041526f2014-04-25 23:15:38 +0300216 struct cpufreq_frequency_table *pos;
Venkatesh Pallipadia6f6e6e62006-10-03 12:37:42 -0700217 struct acpi_processor_performance *perf;
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700218
Matthew Garrett3dc9a632012-09-04 08:28:02 +0000219 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
220 msr &= AMD_MSR_RANGE;
221 else
222 msr &= INTEL_MSR_RANGE;
223
Venkatesh Pallipadia6f6e6e62006-10-03 12:37:42 -0700224 perf = data->acpi_data;
225
Stratos Karafotis041526f2014-04-25 23:15:38 +0300226 cpufreq_for_each_entry(pos, data->freq_table)
227 if (msr == perf->states[pos->driver_data].status)
228 return pos->frequency;
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700229 return data->freq_table[0].frequency;
230}
231
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700232static unsigned extract_freq(u32 val, struct acpi_cpufreq_data *data)
233{
234 switch (data->cpu_feature) {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700235 case SYSTEM_INTEL_MSR_CAPABLE:
Matthew Garrett3dc9a632012-09-04 08:28:02 +0000236 case SYSTEM_AMD_MSR_CAPABLE:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700237 return extract_msr(val, data);
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700238 case SYSTEM_IO_CAPABLE:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700239 return extract_io(val, data);
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700240 default:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700241 return 0;
242 }
243}
244
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700245struct msr_addr {
246 u32 reg;
247};
248
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700249struct io_addr {
250 u16 port;
251 u8 bit_width;
252};
253
254struct drv_cmd {
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700255 unsigned int type;
Ingo Molnarbfa318a2009-01-15 15:46:08 +0100256 const struct cpumask *mask;
Dave Jones3a58df32009-01-17 22:36:14 -0500257 union {
258 struct msr_addr msr;
259 struct io_addr io;
260 } addr;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700261 u32 val;
262};
263
Andrew Morton01599fc2009-04-13 10:27:49 -0700264/* Called via smp_call_function_single(), on the target CPU */
265static void do_drv_read(void *_cmd)
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700266{
Mike Travis72859082009-01-16 15:31:15 -0800267 struct drv_cmd *cmd = _cmd;
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700268 u32 h;
269
270 switch (cmd->type) {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700271 case SYSTEM_INTEL_MSR_CAPABLE:
Matthew Garrett3dc9a632012-09-04 08:28:02 +0000272 case SYSTEM_AMD_MSR_CAPABLE:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700273 rdmsr(cmd->addr.msr.reg, cmd->val, h);
274 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700275 case SYSTEM_IO_CAPABLE:
Venkatesh Pallipadi4e581ff2006-12-13 10:41:16 -0800276 acpi_os_read_port((acpi_io_address)cmd->addr.io.port,
277 &cmd->val,
278 (u32)cmd->addr.io.bit_width);
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700279 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700280 default:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700281 break;
282 }
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700283}
284
Andrew Morton01599fc2009-04-13 10:27:49 -0700285/* Called via smp_call_function_many(), on the target CPUs */
286static void do_drv_write(void *_cmd)
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700287{
Mike Travis72859082009-01-16 15:31:15 -0800288 struct drv_cmd *cmd = _cmd;
Venki Pallipadi13424f62007-05-23 15:42:13 -0700289 u32 lo, hi;
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700290
291 switch (cmd->type) {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700292 case SYSTEM_INTEL_MSR_CAPABLE:
Venki Pallipadi13424f62007-05-23 15:42:13 -0700293 rdmsr(cmd->addr.msr.reg, lo, hi);
294 lo = (lo & ~INTEL_MSR_RANGE) | (cmd->val & INTEL_MSR_RANGE);
295 wrmsr(cmd->addr.msr.reg, lo, hi);
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700296 break;
Matthew Garrett3dc9a632012-09-04 08:28:02 +0000297 case SYSTEM_AMD_MSR_CAPABLE:
298 wrmsr(cmd->addr.msr.reg, cmd->val, 0);
299 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700300 case SYSTEM_IO_CAPABLE:
Venkatesh Pallipadi4e581ff2006-12-13 10:41:16 -0800301 acpi_os_write_port((acpi_io_address)cmd->addr.io.port,
302 cmd->val,
303 (u32)cmd->addr.io.bit_width);
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700304 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700305 default:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700306 break;
307 }
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700308}
309
Dave Jones95dd7222006-10-18 00:41:48 -0400310static void drv_read(struct drv_cmd *cmd)
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700311{
Andrew Morton4a283952009-12-21 16:19:58 -0800312 int err;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700313 cmd->val = 0;
314
Andrew Morton4a283952009-12-21 16:19:58 -0800315 err = smp_call_function_any(cmd->mask, do_drv_read, cmd, 1);
316 WARN_ON_ONCE(err); /* smp_call_function_any() was buggy? */
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700317}
318
319static void drv_write(struct drv_cmd *cmd)
320{
Linus Torvaldsea34f432009-04-15 08:05:13 -0700321 int this_cpu;
322
323 this_cpu = get_cpu();
324 if (cpumask_test_cpu(this_cpu, cmd->mask))
325 do_drv_write(cmd);
Andrew Morton01599fc2009-04-13 10:27:49 -0700326 smp_call_function_many(cmd->mask, do_drv_write, cmd, 1);
Linus Torvaldsea34f432009-04-15 08:05:13 -0700327 put_cpu();
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700328}
329
Mike Travis4d8bb532009-01-04 05:18:08 -0800330static u32 get_cur_val(const struct cpumask *mask)
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700331{
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700332 struct acpi_processor_performance *perf;
333 struct drv_cmd cmd;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700334
Mike Travis4d8bb532009-01-04 05:18:08 -0800335 if (unlikely(cpumask_empty(mask)))
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700336 return 0;
337
Tejun Heof1625062009-10-29 22:34:13 +0900338 switch (per_cpu(acfreq_data, cpumask_first(mask))->cpu_feature) {
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700339 case SYSTEM_INTEL_MSR_CAPABLE:
340 cmd.type = SYSTEM_INTEL_MSR_CAPABLE;
Ross Lagerwall8673b832013-05-31 20:45:17 +0100341 cmd.addr.msr.reg = MSR_IA32_PERF_CTL;
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700342 break;
Matthew Garrett3dc9a632012-09-04 08:28:02 +0000343 case SYSTEM_AMD_MSR_CAPABLE:
344 cmd.type = SYSTEM_AMD_MSR_CAPABLE;
Ross Lagerwall8673b832013-05-31 20:45:17 +0100345 cmd.addr.msr.reg = MSR_AMD_PERF_CTL;
Matthew Garrett3dc9a632012-09-04 08:28:02 +0000346 break;
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700347 case SYSTEM_IO_CAPABLE:
348 cmd.type = SYSTEM_IO_CAPABLE;
Tejun Heof1625062009-10-29 22:34:13 +0900349 perf = per_cpu(acfreq_data, cpumask_first(mask))->acpi_data;
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700350 cmd.addr.io.port = perf->control_register.address;
351 cmd.addr.io.bit_width = perf->control_register.bit_width;
352 break;
353 default:
354 return 0;
355 }
356
Ingo Molnarbfa318a2009-01-15 15:46:08 +0100357 cmd.mask = mask;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700358 drv_read(&cmd);
359
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200360 pr_debug("get_cur_val = %u\n", cmd.val);
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700361
362 return cmd.val;
363}
364
365static unsigned int get_cur_freq_on_cpu(unsigned int cpu)
366{
Tejun Heof1625062009-10-29 22:34:13 +0900367 struct acpi_cpufreq_data *data = per_cpu(acfreq_data, cpu);
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700368 unsigned int freq;
Venkatesh Pallipadie56a7272008-04-28 15:13:43 -0400369 unsigned int cached_freq;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700370
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200371 pr_debug("get_cur_freq_on_cpu (%d)\n", cpu);
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700372
373 if (unlikely(data == NULL ||
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700374 data->acpi_data == NULL || data->freq_table == NULL)) {
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700375 return 0;
376 }
377
Venkatesh Pallipadie56a7272008-04-28 15:13:43 -0400378 cached_freq = data->freq_table[data->acpi_data->state].frequency;
Mike Travise39ad412009-01-04 05:18:10 -0800379 freq = extract_freq(get_cur_val(cpumask_of(cpu)), data);
Venkatesh Pallipadie56a7272008-04-28 15:13:43 -0400380 if (freq != cached_freq) {
381 /*
382 * The dreaded BIOS frequency change behind our back.
383 * Force set the frequency on next target call.
384 */
385 data->resume = 1;
386 }
387
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200388 pr_debug("cur freq = %u\n", freq);
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700389
390 return freq;
391}
392
Mike Travis72859082009-01-16 15:31:15 -0800393static unsigned int check_freqs(const struct cpumask *mask, unsigned int freq,
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700394 struct acpi_cpufreq_data *data)
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700395{
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700396 unsigned int cur_freq;
397 unsigned int i;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700398
Dave Jones3a58df32009-01-17 22:36:14 -0500399 for (i = 0; i < 100; i++) {
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700400 cur_freq = extract_freq(get_cur_val(mask), data);
401 if (cur_freq == freq)
402 return 1;
403 udelay(10);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 }
405 return 0;
406}
407
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700408static int acpi_cpufreq_target(struct cpufreq_policy *policy,
Viresh Kumar9c0ebcf2013-10-25 19:45:48 +0530409 unsigned int index)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410{
Tejun Heof1625062009-10-29 22:34:13 +0900411 struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700412 struct acpi_processor_performance *perf;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700413 struct drv_cmd cmd;
Venkatesh Pallipadi8edc59d92006-12-19 12:58:55 -0800414 unsigned int next_perf_state = 0; /* Index into perf table */
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700415 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700417 if (unlikely(data == NULL ||
Dave Jones95dd7222006-10-18 00:41:48 -0400418 data->acpi_data == NULL || data->freq_table == NULL)) {
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700419 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 }
421
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500422 perf = data->acpi_data;
Viresh Kumar9c0ebcf2013-10-25 19:45:48 +0530423 next_perf_state = data->freq_table[index].driver_data;
Venkatesh Pallipadi7650b282006-10-03 12:36:30 -0700424 if (perf->state == next_perf_state) {
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700425 if (unlikely(data->resume)) {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200426 pr_debug("Called after resume, resetting to P%d\n",
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700427 next_perf_state);
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700428 data->resume = 0;
429 } else {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200430 pr_debug("Already at target state (P%d)\n",
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700431 next_perf_state);
Mike Travis4d8bb532009-01-04 05:18:08 -0800432 goto out;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700433 }
434 }
435
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700436 switch (data->cpu_feature) {
437 case SYSTEM_INTEL_MSR_CAPABLE:
438 cmd.type = SYSTEM_INTEL_MSR_CAPABLE;
439 cmd.addr.msr.reg = MSR_IA32_PERF_CTL;
Venki Pallipadi13424f62007-05-23 15:42:13 -0700440 cmd.val = (u32) perf->states[next_perf_state].control;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700441 break;
Matthew Garrett3dc9a632012-09-04 08:28:02 +0000442 case SYSTEM_AMD_MSR_CAPABLE:
443 cmd.type = SYSTEM_AMD_MSR_CAPABLE;
444 cmd.addr.msr.reg = MSR_AMD_PERF_CTL;
445 cmd.val = (u32) perf->states[next_perf_state].control;
446 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700447 case SYSTEM_IO_CAPABLE:
448 cmd.type = SYSTEM_IO_CAPABLE;
449 cmd.addr.io.port = perf->control_register.address;
450 cmd.addr.io.bit_width = perf->control_register.bit_width;
451 cmd.val = (u32) perf->states[next_perf_state].control;
452 break;
453 default:
Mike Travis4d8bb532009-01-04 05:18:08 -0800454 result = -ENODEV;
455 goto out;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700456 }
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700457
Mike Travis4d8bb532009-01-04 05:18:08 -0800458 /* cpufreq holds the hotplug lock, so we are safe from here on */
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700459 if (policy->shared_type != CPUFREQ_SHARED_TYPE_ANY)
Ingo Molnarbfa318a2009-01-15 15:46:08 +0100460 cmd.mask = policy->cpus;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700461 else
Ingo Molnarbfa318a2009-01-15 15:46:08 +0100462 cmd.mask = cpumask_of(policy->cpu);
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700463
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700464 drv_write(&cmd);
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500465
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700466 if (acpi_pstate_strict) {
Viresh Kumard4019f02013-08-14 19:38:24 +0530467 if (!check_freqs(cmd.mask, data->freq_table[index].frequency,
468 data)) {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200469 pr_debug("acpi_cpufreq_target failed (%d)\n",
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700470 policy->cpu);
Mike Travis4d8bb532009-01-04 05:18:08 -0800471 result = -EAGAIN;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500472 }
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500473 }
474
Viresh Kumare15d8302013-06-19 14:22:55 +0530475 if (!result)
476 perf->state = next_perf_state;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500477
Mike Travis4d8bb532009-01-04 05:18:08 -0800478out:
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700479 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480}
481
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482static unsigned long
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700483acpi_cpufreq_guess_freq(struct acpi_cpufreq_data *data, unsigned int cpu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484{
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700485 struct acpi_processor_performance *perf = data->acpi_data;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500486
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 if (cpu_khz) {
488 /* search the closest match to cpu_khz */
489 unsigned int i;
490 unsigned long freq;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500491 unsigned long freqn = perf->states[0].core_frequency * 1000;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492
Dave Jones3a58df32009-01-17 22:36:14 -0500493 for (i = 0; i < (perf->state_count-1); i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 freq = freqn;
Dave Jones95dd7222006-10-18 00:41:48 -0400495 freqn = perf->states[i+1].core_frequency * 1000;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 if ((2 * cpu_khz) > (freqn + freq)) {
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500497 perf->state = i;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700498 return freq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 }
500 }
Dave Jones95dd7222006-10-18 00:41:48 -0400501 perf->state = perf->state_count-1;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700502 return freqn;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500503 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 /* assume CPU is at P0... */
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500505 perf->state = 0;
506 return perf->states[0].core_frequency * 1000;
507 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508}
509
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800510static void free_acpi_perf_data(void)
511{
512 unsigned int i;
513
514 /* Freeing a NULL pointer is OK, and alloc_percpu zeroes. */
515 for_each_possible_cpu(i)
516 free_cpumask_var(per_cpu_ptr(acpi_perf_data, i)
517 ->shared_cpu_map);
518 free_percpu(acpi_perf_data);
519}
520
Andre Przywara615b7302012-09-04 08:28:07 +0000521static int boost_notify(struct notifier_block *nb, unsigned long action,
522 void *hcpu)
523{
524 unsigned cpu = (long)hcpu;
525 const struct cpumask *cpumask;
526
527 cpumask = get_cpu_mask(cpu);
528
529 /*
530 * Clear the boost-disable bit on the CPU_DOWN path so that
531 * this cpu cannot block the remaining ones from boosting. On
532 * the CPU_UP path we simply keep the boost-disable flag in
533 * sync with the current global state.
534 */
535
536 switch (action) {
537 case CPU_UP_PREPARE:
538 case CPU_UP_PREPARE_FROZEN:
Lukasz Majewskicfc9c8e2013-12-20 15:24:50 +0100539 boost_set_msrs(acpi_cpufreq_driver.boost_enabled, cpumask);
Andre Przywara615b7302012-09-04 08:28:07 +0000540 break;
541
542 case CPU_DOWN_PREPARE:
543 case CPU_DOWN_PREPARE_FROZEN:
544 boost_set_msrs(1, cpumask);
545 break;
546
547 default:
548 break;
549 }
550
551 return NOTIFY_OK;
552}
553
554
555static struct notifier_block boost_nb = {
556 .notifier_call = boost_notify,
557};
558
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500559/*
560 * acpi_cpufreq_early_init - initialize ACPI P-States library
561 *
562 * Initialize the ACPI P-States library (drivers/acpi/processor_perflib.c)
563 * in order to determine correct frequency and voltage pairings. We can
564 * do _PDC and _PSD and find out the processor dependency for the
565 * actual init that will happen later...
566 */
Fenghua Yu50109292007-08-07 18:40:30 -0400567static int __init acpi_cpufreq_early_init(void)
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500568{
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800569 unsigned int i;
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200570 pr_debug("acpi_cpufreq_early_init\n");
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500571
Fenghua Yu50109292007-08-07 18:40:30 -0400572 acpi_perf_data = alloc_percpu(struct acpi_processor_performance);
573 if (!acpi_perf_data) {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200574 pr_debug("Memory allocation error for acpi_perf_data.\n");
Fenghua Yu50109292007-08-07 18:40:30 -0400575 return -ENOMEM;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500576 }
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800577 for_each_possible_cpu(i) {
Yinghai Lueaa95842009-06-06 14:51:36 -0700578 if (!zalloc_cpumask_var_node(
Mike Travis80855f72008-12-31 18:08:47 -0800579 &per_cpu_ptr(acpi_perf_data, i)->shared_cpu_map,
580 GFP_KERNEL, cpu_to_node(i))) {
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800581
582 /* Freeing a NULL pointer is OK: alloc_percpu zeroes. */
583 free_acpi_perf_data();
584 return -ENOMEM;
585 }
586 }
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500587
588 /* Do initialization in ACPI core */
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700589 acpi_processor_preregister_performance(acpi_perf_data);
590 return 0;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500591}
592
Dave Jones95625b82006-10-21 01:37:39 -0400593#ifdef CONFIG_SMP
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700594/*
595 * Some BIOSes do SW_ANY coordination internally, either set it up in hw
596 * or do it in BIOS firmware and won't inform about it to OS. If not
597 * detected, this has a side effect of making CPU run at a different speed
598 * than OS intended it to run at. Detect it and handle it cleanly.
599 */
600static int bios_with_sw_any_bug;
601
Jeff Garzik18552562007-10-03 15:15:40 -0400602static int sw_any_bug_found(const struct dmi_system_id *d)
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700603{
604 bios_with_sw_any_bug = 1;
605 return 0;
606}
607
Jeff Garzik18552562007-10-03 15:15:40 -0400608static const struct dmi_system_id sw_any_bug_dmi_table[] = {
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700609 {
610 .callback = sw_any_bug_found,
611 .ident = "Supermicro Server X6DLP",
612 .matches = {
613 DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
614 DMI_MATCH(DMI_BIOS_VERSION, "080010"),
615 DMI_MATCH(DMI_PRODUCT_NAME, "X6DLP"),
616 },
617 },
618 { }
619};
Prarit Bhargava1a8e42f2009-08-26 13:19:37 -0400620
621static int acpi_cpufreq_blacklist(struct cpuinfo_x86 *c)
622{
John Villalovos293afe42009-09-25 13:30:08 -0400623 /* Intel Xeon Processor 7100 Series Specification Update
624 * http://www.intel.com/Assets/PDF/specupdate/314554.pdf
Prarit Bhargava1a8e42f2009-08-26 13:19:37 -0400625 * AL30: A Machine Check Exception (MCE) Occurring during an
626 * Enhanced Intel SpeedStep Technology Ratio Change May Cause
John Villalovos293afe42009-09-25 13:30:08 -0400627 * Both Processor Cores to Lock Up. */
Prarit Bhargava1a8e42f2009-08-26 13:19:37 -0400628 if (c->x86_vendor == X86_VENDOR_INTEL) {
629 if ((c->x86 == 15) &&
630 (c->x86_model == 6) &&
John Villalovos293afe42009-09-25 13:30:08 -0400631 (c->x86_mask == 8)) {
632 printk(KERN_INFO "acpi-cpufreq: Intel(R) "
633 "Xeon(R) 7100 Errata AL30, processors may "
634 "lock up on frequency changes: disabling "
635 "acpi-cpufreq.\n");
Prarit Bhargava1a8e42f2009-08-26 13:19:37 -0400636 return -ENODEV;
John Villalovos293afe42009-09-25 13:30:08 -0400637 }
Prarit Bhargava1a8e42f2009-08-26 13:19:37 -0400638 }
639 return 0;
640}
Dave Jones95625b82006-10-21 01:37:39 -0400641#endif
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700642
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700643static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644{
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700645 unsigned int i;
646 unsigned int valid_states = 0;
647 unsigned int cpu = policy->cpu;
648 struct acpi_cpufreq_data *data;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700649 unsigned int result = 0;
Mike Travis92cb7612007-10-19 20:35:04 +0200650 struct cpuinfo_x86 *c = &cpu_data(policy->cpu);
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700651 struct acpi_processor_performance *perf;
John Villalovos293afe42009-09-25 13:30:08 -0400652#ifdef CONFIG_SMP
653 static int blacklisted;
654#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200656 pr_debug("acpi_cpufreq_cpu_init\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657
Prarit Bhargava1a8e42f2009-08-26 13:19:37 -0400658#ifdef CONFIG_SMP
John Villalovos293afe42009-09-25 13:30:08 -0400659 if (blacklisted)
660 return blacklisted;
661 blacklisted = acpi_cpufreq_blacklist(c);
662 if (blacklisted)
663 return blacklisted;
Prarit Bhargava1a8e42f2009-08-26 13:19:37 -0400664#endif
665
Viresh Kumard5b73cd2013-08-06 22:53:06 +0530666 data = kzalloc(sizeof(*data), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 if (!data)
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700668 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669
Lan Tianyuf4fd3792013-06-27 15:08:54 +0800670 if (!zalloc_cpumask_var(&data->freqdomain_cpus, GFP_KERNEL)) {
671 result = -ENOMEM;
672 goto err_free;
673 }
674
Rusty Russellb36128c2009-02-20 16:29:08 +0900675 data->acpi_data = per_cpu_ptr(acpi_perf_data, cpu);
Tejun Heof1625062009-10-29 22:34:13 +0900676 per_cpu(acfreq_data, cpu) = data;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700677
Dave Jones95dd7222006-10-18 00:41:48 -0400678 if (cpu_has(c, X86_FEATURE_CONSTANT_TSC))
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700679 acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500681 result = acpi_processor_register_performance(data->acpi_data, cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 if (result)
Lan Tianyuf4fd3792013-06-27 15:08:54 +0800683 goto err_free_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500685 perf = data->acpi_data;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500686 policy->shared_type = perf->shared_type;
Dave Jones95dd7222006-10-18 00:41:48 -0400687
Venkatesh Pallipadi46f18e32006-06-26 00:34:43 -0400688 /*
Dave Jones95dd7222006-10-18 00:41:48 -0400689 * Will let policy->cpus know about dependency only when software
Venkatesh Pallipadi46f18e32006-06-26 00:34:43 -0400690 * coordination is required.
691 */
692 if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL ||
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700693 policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) {
Rusty Russell835481d2009-01-04 05:18:06 -0800694 cpumask_copy(policy->cpus, perf->shared_cpu_map);
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700695 }
Lan Tianyuf4fd3792013-06-27 15:08:54 +0800696 cpumask_copy(data->freqdomain_cpus, perf->shared_cpu_map);
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700697
698#ifdef CONFIG_SMP
699 dmi_check_system(sw_any_bug_dmi_table);
Fabio Baltieri2624f902013-01-31 09:44:40 +0000700 if (bios_with_sw_any_bug && !policy_is_shared(policy)) {
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700701 policy->shared_type = CPUFREQ_SHARED_TYPE_ALL;
Rusty Russell835481d2009-01-04 05:18:06 -0800702 cpumask_copy(policy->cpus, cpu_core_mask(cpu));
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700703 }
Andre Przywaraacd31622012-09-04 08:28:03 +0000704
705 if (check_amd_hwpstate_cpu(cpu) && !acpi_pstate_strict) {
706 cpumask_clear(policy->cpus);
707 cpumask_set_cpu(cpu, policy->cpus);
Lan Tianyuf4fd3792013-06-27 15:08:54 +0800708 cpumask_copy(data->freqdomain_cpus, cpu_sibling_mask(cpu));
Andre Przywaraacd31622012-09-04 08:28:03 +0000709 policy->shared_type = CPUFREQ_SHARED_TYPE_HW;
710 pr_info_once(PFX "overriding BIOS provided _PSD data\n");
711 }
Venkatesh Pallipadi8adcc0c2006-09-01 14:02:24 -0700712#endif
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500713
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714 /* capability check */
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500715 if (perf->state_count <= 1) {
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200716 pr_debug("No P-States\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 result = -ENODEV;
718 goto err_unreg;
719 }
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500720
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700721 if (perf->control_register.space_id != perf->status_register.space_id) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 result = -ENODEV;
723 goto err_unreg;
724 }
725
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700726 switch (perf->control_register.space_id) {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700727 case ACPI_ADR_SPACE_SYSTEM_IO:
Matthew Garrettc40a4512013-01-20 10:24:26 +0000728 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
729 boot_cpu_data.x86 == 0xf) {
730 pr_debug("AMD K8 systems must use native drivers.\n");
731 result = -ENODEV;
732 goto err_unreg;
733 }
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200734 pr_debug("SYSTEM IO addr space\n");
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700735 data->cpu_feature = SYSTEM_IO_CAPABLE;
736 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700737 case ACPI_ADR_SPACE_FIXED_HARDWARE:
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200738 pr_debug("HARDWARE addr space\n");
Matthew Garrett3dc9a632012-09-04 08:28:02 +0000739 if (check_est_cpu(cpu)) {
740 data->cpu_feature = SYSTEM_INTEL_MSR_CAPABLE;
741 break;
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700742 }
Matthew Garrett3dc9a632012-09-04 08:28:02 +0000743 if (check_amd_hwpstate_cpu(cpu)) {
744 data->cpu_feature = SYSTEM_AMD_MSR_CAPABLE;
745 break;
746 }
747 result = -ENODEV;
748 goto err_unreg;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700749 default:
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200750 pr_debug("Unknown addr space %d\n",
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700751 (u32) (perf->control_register.space_id));
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700752 result = -ENODEV;
753 goto err_unreg;
754 }
755
Viresh Kumar71508a12014-03-28 19:11:46 +0530756 data->freq_table = kzalloc(sizeof(*data->freq_table) *
Dave Jones95dd7222006-10-18 00:41:48 -0400757 (perf->state_count+1), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 if (!data->freq_table) {
759 result = -ENOMEM;
760 goto err_unreg;
761 }
762
763 /* detect transition latency */
764 policy->cpuinfo.transition_latency = 0;
Dave Jones3a58df32009-01-17 22:36:14 -0500765 for (i = 0; i < perf->state_count; i++) {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700766 if ((perf->states[i].transition_latency * 1000) >
767 policy->cpuinfo.transition_latency)
768 policy->cpuinfo.transition_latency =
769 perf->states[i].transition_latency * 1000;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771
Pallipadi, Venkatesha59d1632009-03-19 14:41:40 -0700772 /* Check for high latency (>20uS) from buggy BIOSes, like on T42 */
773 if (perf->control_register.space_id == ACPI_ADR_SPACE_FIXED_HARDWARE &&
774 policy->cpuinfo.transition_latency > 20 * 1000) {
Pallipadi, Venkatesha59d1632009-03-19 14:41:40 -0700775 policy->cpuinfo.transition_latency = 20 * 1000;
Joe Perches61c8c672009-05-26 14:58:39 -0700776 printk_once(KERN_INFO
777 "P-state transition latency capped at 20 uS\n");
Pallipadi, Venkatesha59d1632009-03-19 14:41:40 -0700778 }
779
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 /* table init */
Dave Jones3a58df32009-01-17 22:36:14 -0500781 for (i = 0; i < perf->state_count; i++) {
782 if (i > 0 && perf->states[i].core_frequency >=
Zhang Rui3cdf5522007-06-13 21:24:02 -0400783 data->freq_table[valid_states-1].frequency / 1000)
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700784 continue;
785
Viresh Kumar50701582013-03-30 16:25:15 +0530786 data->freq_table[valid_states].driver_data = i;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700787 data->freq_table[valid_states].frequency =
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700788 perf->states[i].core_frequency * 1000;
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700789 valid_states++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 }
Venkatesh Pallipadi3d4a7ef2006-11-13 17:47:44 -0800791 data->freq_table[valid_states].frequency = CPUFREQ_TABLE_END;
Venkatesh Pallipadi8edc59d92006-12-19 12:58:55 -0800792 perf->state = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793
Viresh Kumar776b57b2013-09-16 18:56:07 +0530794 result = cpufreq_table_validate_and_show(policy, data->freq_table);
Dave Jones95dd7222006-10-18 00:41:48 -0400795 if (result)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 goto err_freqfree;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797
Thomas Renningerd876dfb2009-04-17 16:22:08 +0200798 if (perf->states[0].core_frequency * 1000 != policy->cpuinfo.max_freq)
799 printk(KERN_WARNING FW_WARN "P-state 0 is not max freq\n");
800
Mattia Dongilia507ac42006-12-15 19:52:45 +0100801 switch (perf->control_register.space_id) {
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700802 case ACPI_ADR_SPACE_SYSTEM_IO:
Viresh Kumar1bab64d2013-10-16 23:58:10 +0200803 /*
804 * The core will not set policy->cur, because
805 * cpufreq_driver->get is NULL, so we need to set it here.
806 * However, we have to guess it, because the current speed is
807 * unknown and not detectable via IO ports.
808 */
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700809 policy->cur = acpi_cpufreq_guess_freq(data, policy->cpu);
810 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700811 case ACPI_ADR_SPACE_FIXED_HARDWARE:
Venkatesh Pallipadi7650b282006-10-03 12:36:30 -0700812 acpi_cpufreq_driver.get = get_cur_freq_on_cpu;
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700813 break;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700814 default:
Venkatesh Pallipadidde9f7b2006-10-03 12:33:14 -0700815 break;
816 }
817
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 /* notify BIOS that we exist */
819 acpi_processor_notify_smm(THIS_MODULE);
820
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200821 pr_debug("CPU%u - ACPI performance management activated.\n", cpu);
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500822 for (i = 0; i < perf->state_count; i++)
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200823 pr_debug(" %cP%d: %d MHz, %d mW, %d uS\n",
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700824 (i == perf->state ? '*' : ' '), i,
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500825 (u32) perf->states[i].core_frequency,
826 (u32) perf->states[i].power,
827 (u32) perf->states[i].transition_latency);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828
Dominik Brodowski4b31e772005-05-18 13:49:00 -0400829 /*
830 * the first call to ->target() should result in us actually
831 * writing something to the appropriate registers.
832 */
833 data->resume = 1;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700834
Venkatesh Pallipadife27cb32006-10-03 12:29:15 -0700835 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836
Dave Jones95dd7222006-10-18 00:41:48 -0400837err_freqfree:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 kfree(data->freq_table);
Dave Jones95dd7222006-10-18 00:41:48 -0400839err_unreg:
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500840 acpi_processor_unregister_performance(perf, cpu);
Lan Tianyuf4fd3792013-06-27 15:08:54 +0800841err_free_mask:
842 free_cpumask_var(data->freqdomain_cpus);
Dave Jones95dd7222006-10-18 00:41:48 -0400843err_free:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844 kfree(data);
Tejun Heof1625062009-10-29 22:34:13 +0900845 per_cpu(acfreq_data, cpu) = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700847 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848}
849
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700850static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851{
Tejun Heof1625062009-10-29 22:34:13 +0900852 struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200854 pr_debug("acpi_cpufreq_cpu_exit\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855
856 if (data) {
Tejun Heof1625062009-10-29 22:34:13 +0900857 per_cpu(acfreq_data, policy->cpu) = NULL;
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700858 acpi_processor_unregister_performance(data->acpi_data,
859 policy->cpu);
Lan Tianyuf4fd3792013-06-27 15:08:54 +0800860 free_cpumask_var(data->freqdomain_cpus);
Zhang Ruidab5fff2010-10-12 09:09:37 +0800861 kfree(data->freq_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862 kfree(data);
863 }
864
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700865 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866}
867
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700868static int acpi_cpufreq_resume(struct cpufreq_policy *policy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869{
Tejun Heof1625062009-10-29 22:34:13 +0900870 struct acpi_cpufreq_data *data = per_cpu(acfreq_data, policy->cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200872 pr_debug("acpi_cpufreq_resume\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873
874 data->resume = 1;
875
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700876 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877}
878
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700879static struct freq_attr *acpi_cpufreq_attr[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 &cpufreq_freq_attr_scaling_available_freqs,
Lan Tianyuf4fd3792013-06-27 15:08:54 +0800881 &freqdomain_cpus,
Andre Przywara11269ff2012-09-04 08:28:08 +0000882 NULL, /* this is a placeholder for cpb, do not remove */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 NULL,
884};
885
886static struct cpufreq_driver acpi_cpufreq_driver = {
Viresh Kumardb9be212013-10-03 20:27:56 +0530887 .verify = cpufreq_generic_frequency_table_verify,
Viresh Kumar9c0ebcf2013-10-25 19:45:48 +0530888 .target_index = acpi_cpufreq_target,
Thomas Renningere2f74f32009-11-19 12:31:01 +0100889 .bios_limit = acpi_processor_get_bios_limit,
890 .init = acpi_cpufreq_cpu_init,
891 .exit = acpi_cpufreq_cpu_exit,
892 .resume = acpi_cpufreq_resume,
893 .name = "acpi-cpufreq",
Thomas Renningere2f74f32009-11-19 12:31:01 +0100894 .attr = acpi_cpufreq_attr,
Lukasz Majewskicfc9c8e2013-12-20 15:24:50 +0100895 .set_boost = _store_boost,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896};
897
Andre Przywara615b7302012-09-04 08:28:07 +0000898static void __init acpi_cpufreq_boost_init(void)
899{
900 if (boot_cpu_has(X86_FEATURE_CPB) || boot_cpu_has(X86_FEATURE_IDA)) {
901 msrs = msrs_alloc();
902
903 if (!msrs)
904 return;
905
Lukasz Majewskicfc9c8e2013-12-20 15:24:50 +0100906 acpi_cpufreq_driver.boost_supported = true;
907 acpi_cpufreq_driver.boost_enabled = boost_state(0);
Srivatsa S. Bhat0197fbd2014-03-11 02:10:06 +0530908
909 cpu_notifier_register_begin();
Andre Przywara615b7302012-09-04 08:28:07 +0000910
911 /* Force all MSRs to the same value */
Lukasz Majewskicfc9c8e2013-12-20 15:24:50 +0100912 boost_set_msrs(acpi_cpufreq_driver.boost_enabled,
913 cpu_online_mask);
Andre Przywara615b7302012-09-04 08:28:07 +0000914
Srivatsa S. Bhat0197fbd2014-03-11 02:10:06 +0530915 __register_cpu_notifier(&boost_nb);
Andre Przywara615b7302012-09-04 08:28:07 +0000916
Srivatsa S. Bhat0197fbd2014-03-11 02:10:06 +0530917 cpu_notifier_register_done();
Lukasz Majewskicfc9c8e2013-12-20 15:24:50 +0100918 }
Andre Przywara615b7302012-09-04 08:28:07 +0000919}
920
Konrad Rzeszutek Wilkeb8c68e2014-01-27 22:50:35 -0500921static void acpi_cpufreq_boost_exit(void)
Andre Przywara615b7302012-09-04 08:28:07 +0000922{
Andre Przywara615b7302012-09-04 08:28:07 +0000923 if (msrs) {
924 unregister_cpu_notifier(&boost_nb);
925
926 msrs_free(msrs);
927 msrs = NULL;
928 }
929}
930
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700931static int __init acpi_cpufreq_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932{
Fenghua Yu50109292007-08-07 18:40:30 -0400933 int ret;
934
Rafael J. Wysocki75c07582013-10-25 16:22:47 +0200935 if (acpi_disabled)
936 return -ENODEV;
937
Yinghai Lu8a61e122013-09-20 10:43:56 -0700938 /* don't keep reloading if cpufreq_driver exists */
939 if (cpufreq_get_current_driver())
Rafael J. Wysocki75c07582013-10-25 16:22:47 +0200940 return -EEXIST;
Yinghai Luee297532008-09-24 19:04:31 -0700941
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200942 pr_debug("acpi_cpufreq_init\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943
Fenghua Yu50109292007-08-07 18:40:30 -0400944 ret = acpi_cpufreq_early_init();
945 if (ret)
946 return ret;
Venkatesh Pallipadi09b4d1e2005-12-14 15:05:00 -0500947
Andre Przywara11269ff2012-09-04 08:28:08 +0000948#ifdef CONFIG_X86_ACPI_CPUFREQ_CPB
949 /* this is a sysfs file with a strange name and an even stranger
950 * semantic - per CPU instantiation, but system global effect.
951 * Lets enable it only on AMD CPUs for compatibility reasons and
952 * only if configured. This is considered legacy code, which
953 * will probably be removed at some point in the future.
954 */
955 if (check_amd_hwpstate_cpu(0)) {
956 struct freq_attr **iter;
957
958 pr_debug("adding sysfs entry for cpb\n");
959
960 for (iter = acpi_cpufreq_attr; *iter != NULL; iter++)
961 ;
962
963 /* make sure there is a terminator behind it */
964 if (iter[1] == NULL)
965 *iter = &cpb;
966 }
967#endif
Lukasz Majewskicfc9c8e2013-12-20 15:24:50 +0100968 acpi_cpufreq_boost_init();
Andre Przywara11269ff2012-09-04 08:28:08 +0000969
Akinobu Mita847aef62008-07-14 11:59:44 +0900970 ret = cpufreq_register_driver(&acpi_cpufreq_driver);
Konrad Rzeszutek Wilkeb8c68e2014-01-27 22:50:35 -0500971 if (ret) {
Rusty Russell2fdf66b2008-12-31 18:08:47 -0800972 free_acpi_perf_data();
Konrad Rzeszutek Wilkeb8c68e2014-01-27 22:50:35 -0500973 acpi_cpufreq_boost_exit();
974 }
Akinobu Mita847aef62008-07-14 11:59:44 +0900975 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976}
977
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700978static void __exit acpi_cpufreq_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979{
Dominik Brodowski2d06d8c2011-03-27 15:04:46 +0200980 pr_debug("acpi_cpufreq_exit\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981
Andre Przywara615b7302012-09-04 08:28:07 +0000982 acpi_cpufreq_boost_exit();
983
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 cpufreq_unregister_driver(&acpi_cpufreq_driver);
985
Luming Yu50f4ddd2011-07-08 16:37:44 -0400986 free_acpi_perf_data();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987}
988
Venkatesh Pallipadid395bf12005-08-25 15:59:00 -0400989module_param(acpi_pstate_strict, uint, 0644);
Venkatesh Pallipadi64be7ee2006-10-03 12:35:23 -0700990MODULE_PARM_DESC(acpi_pstate_strict,
Dave Jones95dd7222006-10-18 00:41:48 -0400991 "value 0 or non-zero. non-zero -> strict ACPI checks are "
992 "performed during frequency changes.");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993
994late_initcall(acpi_cpufreq_init);
995module_exit(acpi_cpufreq_exit);
996
Matthew Garrettefa17192013-01-22 22:33:46 +0100997static const struct x86_cpu_id acpi_cpufreq_ids[] = {
998 X86_FEATURE_MATCH(X86_FEATURE_ACPI),
999 X86_FEATURE_MATCH(X86_FEATURE_HW_PSTATE),
1000 {}
1001};
1002MODULE_DEVICE_TABLE(x86cpu, acpi_cpufreq_ids);
1003
Rafael J. Wysockic655aff2013-06-07 13:13:31 +02001004static const struct acpi_device_id processor_device_ids[] = {
1005 {ACPI_PROCESSOR_OBJECT_HID, },
1006 {ACPI_PROCESSOR_DEVICE_HID, },
1007 {},
1008};
1009MODULE_DEVICE_TABLE(acpi, processor_device_ids);
1010
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011MODULE_ALIAS("acpi");