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Commit 7b14dedd1fe72f33e128ed1b0cbf96d06acc7e9c

Authored by Adrian Bunk
Committed by Dave Jones
1 parent 7970e08bf0
Exists in master and in 39 other branches 8mp-imx_5.4.70_2.3.0, 8qm-imx_5.4.70_2.3.0, emb_imx_lf-5.15.y, emb_lf-6.1.y, imx_3.0.35_4.1.0, imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, imx_4.1.15_1.0.0_ga, pitx_8mp_lf-5.10.y, rt-smarc-imx_4.1.15_1.0.0_ga, rt_linux_5.15.71, smarc-8m-android-11.0.0_2.0.0, smarc-imx6_4.14.98_2.0.0_ga, smarc-imx6_4.9.88_2.0.0_ga, smarc-imx7_4.14.98_2.0.0_ga, smarc-imx7_4.9.11_1.0.0_ga, smarc-imx7_4.9.88_2.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga, smarc-imx_4.1.15_1.0.0_ga, smarc-imx_4.9.11_1.0.0_ga, smarc-imx_4.9.51_imx8m_ga, smarc-imx_4.9.88_2.0.0_ga, smarc-m6.0.1_2.1.0-ga, smarc-n7.1.2_2.0.0-ga, smarc-rel_imx_4.1.15_1.2.0_ga, smarc_8m_00d0_imx_4.14.98_2.0.0_ga, smarc_8m_imx_4.14.78_1.0.0_ga, smarc_8m_imx_4.14.98_2.0.0_ga, smarc_8m_imx_4.19.35_1.1.0, smarc_8mm_imx_4.14.78_1.0.0_ga, smarc_8mm_imx_4.14.98_2.0.0_ga, smarc_8mm_imx_4.19.35_1.1.0, smarc_8mm_imx_5.4.24_2.1.0, smarc_8mp_lf-5.10.y, smarc_8mq_imx_5.4.24_2.1.0, smarc_8mq_lf-5.10.y, smarc_imx_lf-5.15.y

[CPUFREQ] drivers/cpufreq/cpufreq.c: static functions mustn't be exported 

This patch removes the EXPORT_SYMBOL_GPL of the static function cpufreq_parse_governor().

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Dave Jones <davej@redhat.com>

Showing 1 changed file with 0 additions and 1 deletions Inline Diff

drivers/cpufreq/cpufreq.c
Diff comments   View file @ 7b14ded
1 /* 1 /*
2 * linux/drivers/cpufreq/cpufreq.c 2 * linux/drivers/cpufreq/cpufreq.c
3 * 3 *
4 * Copyright (C) 2001 Russell King 4 * Copyright (C) 2001 Russell King
5 * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de> 5 * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
6 * 6 *
7 * Oct 2005 - Ashok Raj <ashok.raj@intel.com> 7 * Oct 2005 - Ashok Raj <ashok.raj@intel.com>
8 * Added handling for CPU hotplug 8 * Added handling for CPU hotplug
9 * Feb 2006 - Jacob Shin <jacob.shin@amd.com> 9 * Feb 2006 - Jacob Shin <jacob.shin@amd.com>
10 * Fix handling for CPU hotplug -- affected CPUs 10 * Fix handling for CPU hotplug -- affected CPUs
11 * 11 *
12 * This program is free software; you can redistribute it and/or modify 12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as 13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation. 14 * published by the Free Software Foundation.
15 * 15 *
16 */ 16 */
17 17
18 #include <linux/config.h> 18 #include <linux/config.h>
19 #include <linux/kernel.h> 19 #include <linux/kernel.h>
20 #include <linux/module.h> 20 #include <linux/module.h>
21 #include <linux/init.h> 21 #include <linux/init.h>
22 #include <linux/notifier.h> 22 #include <linux/notifier.h>
23 #include <linux/cpufreq.h> 23 #include <linux/cpufreq.h>
24 #include <linux/delay.h> 24 #include <linux/delay.h>
25 #include <linux/interrupt.h> 25 #include <linux/interrupt.h>
26 #include <linux/spinlock.h> 26 #include <linux/spinlock.h>
27 #include <linux/device.h> 27 #include <linux/device.h>
28 #include <linux/slab.h> 28 #include <linux/slab.h>
29 #include <linux/cpu.h> 29 #include <linux/cpu.h>
30 #include <linux/completion.h> 30 #include <linux/completion.h>
31 #include <linux/mutex.h> 31 #include <linux/mutex.h>
32 32
33 #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, "cpufreq-core", msg) 33 #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, "cpufreq-core", msg)
34 34
35 /** 35 /**
36 * The "cpufreq driver" - the arch- or hardware-dependend low 36 * The "cpufreq driver" - the arch- or hardware-dependend low
37 * level driver of CPUFreq support, and its spinlock. This lock 37 * level driver of CPUFreq support, and its spinlock. This lock
38 * also protects the cpufreq_cpu_data array. 38 * also protects the cpufreq_cpu_data array.
39 */ 39 */
40 static struct cpufreq_driver *cpufreq_driver; 40 static struct cpufreq_driver *cpufreq_driver;
41 static struct cpufreq_policy *cpufreq_cpu_data[NR_CPUS]; 41 static struct cpufreq_policy *cpufreq_cpu_data[NR_CPUS];
42 static DEFINE_SPINLOCK(cpufreq_driver_lock); 42 static DEFINE_SPINLOCK(cpufreq_driver_lock);
43 43
44 /* internal prototypes */ 44 /* internal prototypes */
45 static int __cpufreq_governor(struct cpufreq_policy *policy, unsigned int event); 45 static int __cpufreq_governor(struct cpufreq_policy *policy, unsigned int event);
46 static void handle_update(void *data); 46 static void handle_update(void *data);
47 47
48 /** 48 /**
49 * Two notifier lists: the "policy" list is involved in the 49 * Two notifier lists: the "policy" list is involved in the
50 * validation process for a new CPU frequency policy; the 50 * validation process for a new CPU frequency policy; the
51 * "transition" list for kernel code that needs to handle 51 * "transition" list for kernel code that needs to handle
52 * changes to devices when the CPU clock speed changes. 52 * changes to devices when the CPU clock speed changes.
53 * The mutex locks both lists. 53 * The mutex locks both lists.
54 */ 54 */
55 static BLOCKING_NOTIFIER_HEAD(cpufreq_policy_notifier_list); 55 static BLOCKING_NOTIFIER_HEAD(cpufreq_policy_notifier_list);
56 static BLOCKING_NOTIFIER_HEAD(cpufreq_transition_notifier_list); 56 static BLOCKING_NOTIFIER_HEAD(cpufreq_transition_notifier_list);
57 57
58 58
59 static LIST_HEAD(cpufreq_governor_list); 59 static LIST_HEAD(cpufreq_governor_list);
60 static DEFINE_MUTEX (cpufreq_governor_mutex); 60 static DEFINE_MUTEX (cpufreq_governor_mutex);
61 61
62 struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu) 62 struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
63 { 63 {
64 struct cpufreq_policy *data; 64 struct cpufreq_policy *data;
65 unsigned long flags; 65 unsigned long flags;
66 66
67 if (cpu >= NR_CPUS) 67 if (cpu >= NR_CPUS)
68 goto err_out; 68 goto err_out;
69 69
70 /* get the cpufreq driver */ 70 /* get the cpufreq driver */
71 spin_lock_irqsave(&cpufreq_driver_lock, flags); 71 spin_lock_irqsave(&cpufreq_driver_lock, flags);
72 72
73 if (!cpufreq_driver) 73 if (!cpufreq_driver)
74 goto err_out_unlock; 74 goto err_out_unlock;
75 75
76 if (!try_module_get(cpufreq_driver->owner)) 76 if (!try_module_get(cpufreq_driver->owner))
77 goto err_out_unlock; 77 goto err_out_unlock;
78 78
79 79
80 /* get the CPU */ 80 /* get the CPU */
81 data = cpufreq_cpu_data[cpu]; 81 data = cpufreq_cpu_data[cpu];
82 82
83 if (!data) 83 if (!data)
84 goto err_out_put_module; 84 goto err_out_put_module;
85 85
86 if (!kobject_get(&data->kobj)) 86 if (!kobject_get(&data->kobj))
87 goto err_out_put_module; 87 goto err_out_put_module;
88 88
89 spin_unlock_irqrestore(&cpufreq_driver_lock, flags); 89 spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
90 return data; 90 return data;
91 91
92 err_out_put_module: 92 err_out_put_module:
93 module_put(cpufreq_driver->owner); 93 module_put(cpufreq_driver->owner);
94 err_out_unlock: 94 err_out_unlock:
95 spin_unlock_irqrestore(&cpufreq_driver_lock, flags); 95 spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
96 err_out: 96 err_out:
97 return NULL; 97 return NULL;
98 } 98 }
99 EXPORT_SYMBOL_GPL(cpufreq_cpu_get); 99 EXPORT_SYMBOL_GPL(cpufreq_cpu_get);
100 100
101 101
102 void cpufreq_cpu_put(struct cpufreq_policy *data) 102 void cpufreq_cpu_put(struct cpufreq_policy *data)
103 { 103 {
104 kobject_put(&data->kobj); 104 kobject_put(&data->kobj);
105 module_put(cpufreq_driver->owner); 105 module_put(cpufreq_driver->owner);
106 } 106 }
107 EXPORT_SYMBOL_GPL(cpufreq_cpu_put); 107 EXPORT_SYMBOL_GPL(cpufreq_cpu_put);
108 108
109 109
110 /********************************************************************* 110 /*********************************************************************
111 * UNIFIED DEBUG HELPERS * 111 * UNIFIED DEBUG HELPERS *
112 *********************************************************************/ 112 *********************************************************************/
113 #ifdef CONFIG_CPU_FREQ_DEBUG 113 #ifdef CONFIG_CPU_FREQ_DEBUG
114 114
115 /* what part(s) of the CPUfreq subsystem are debugged? */ 115 /* what part(s) of the CPUfreq subsystem are debugged? */
116 static unsigned int debug; 116 static unsigned int debug;
117 117
118 /* is the debug output ratelimit'ed using printk_ratelimit? User can 118 /* is the debug output ratelimit'ed using printk_ratelimit? User can
119 * set or modify this value. 119 * set or modify this value.
120 */ 120 */
121 static unsigned int debug_ratelimit = 1; 121 static unsigned int debug_ratelimit = 1;
122 122
123 /* is the printk_ratelimit'ing enabled? It's enabled after a successful 123 /* is the printk_ratelimit'ing enabled? It's enabled after a successful
124 * loading of a cpufreq driver, temporarily disabled when a new policy 124 * loading of a cpufreq driver, temporarily disabled when a new policy
125 * is set, and disabled upon cpufreq driver removal 125 * is set, and disabled upon cpufreq driver removal
126 */ 126 */
127 static unsigned int disable_ratelimit = 1; 127 static unsigned int disable_ratelimit = 1;
128 static DEFINE_SPINLOCK(disable_ratelimit_lock); 128 static DEFINE_SPINLOCK(disable_ratelimit_lock);
129 129
130 static void cpufreq_debug_enable_ratelimit(void) 130 static void cpufreq_debug_enable_ratelimit(void)
131 { 131 {
132 unsigned long flags; 132 unsigned long flags;
133 133
134 spin_lock_irqsave(&disable_ratelimit_lock, flags); 134 spin_lock_irqsave(&disable_ratelimit_lock, flags);
135 if (disable_ratelimit) 135 if (disable_ratelimit)
136 disable_ratelimit--; 136 disable_ratelimit--;
137 spin_unlock_irqrestore(&disable_ratelimit_lock, flags); 137 spin_unlock_irqrestore(&disable_ratelimit_lock, flags);
138 } 138 }
139 139
140 static void cpufreq_debug_disable_ratelimit(void) 140 static void cpufreq_debug_disable_ratelimit(void)
141 { 141 {
142 unsigned long flags; 142 unsigned long flags;
143 143
144 spin_lock_irqsave(&disable_ratelimit_lock, flags); 144 spin_lock_irqsave(&disable_ratelimit_lock, flags);
145 disable_ratelimit++; 145 disable_ratelimit++;
146 spin_unlock_irqrestore(&disable_ratelimit_lock, flags); 146 spin_unlock_irqrestore(&disable_ratelimit_lock, flags);
147 } 147 }
148 148
149 void cpufreq_debug_printk(unsigned int type, const char *prefix, const char *fmt, ...) 149 void cpufreq_debug_printk(unsigned int type, const char *prefix, const char *fmt, ...)
150 { 150 {
151 char s[256]; 151 char s[256];
152 va_list args; 152 va_list args;
153 unsigned int len; 153 unsigned int len;
154 unsigned long flags; 154 unsigned long flags;
155 155
156 WARN_ON(!prefix); 156 WARN_ON(!prefix);
157 if (type & debug) { 157 if (type & debug) {
158 spin_lock_irqsave(&disable_ratelimit_lock, flags); 158 spin_lock_irqsave(&disable_ratelimit_lock, flags);
159 if (!disable_ratelimit && debug_ratelimit && !printk_ratelimit()) { 159 if (!disable_ratelimit && debug_ratelimit && !printk_ratelimit()) {
160 spin_unlock_irqrestore(&disable_ratelimit_lock, flags); 160 spin_unlock_irqrestore(&disable_ratelimit_lock, flags);
161 return; 161 return;
162 } 162 }
163 spin_unlock_irqrestore(&disable_ratelimit_lock, flags); 163 spin_unlock_irqrestore(&disable_ratelimit_lock, flags);
164 164
165 len = snprintf(s, 256, KERN_DEBUG "%s: ", prefix); 165 len = snprintf(s, 256, KERN_DEBUG "%s: ", prefix);
166 166
167 va_start(args, fmt); 167 va_start(args, fmt);
168 len += vsnprintf(&s[len], (256 - len), fmt, args); 168 len += vsnprintf(&s[len], (256 - len), fmt, args);
169 va_end(args); 169 va_end(args);
170 170
171 printk(s); 171 printk(s);
172 172
173 WARN_ON(len < 5); 173 WARN_ON(len < 5);
174 } 174 }
175 } 175 }
176 EXPORT_SYMBOL(cpufreq_debug_printk); 176 EXPORT_SYMBOL(cpufreq_debug_printk);
177 177
178 178
179 module_param(debug, uint, 0644); 179 module_param(debug, uint, 0644);
180 MODULE_PARM_DESC(debug, "CPUfreq debugging: add 1 to debug core, 2 to debug drivers, and 4 to debug governors."); 180 MODULE_PARM_DESC(debug, "CPUfreq debugging: add 1 to debug core, 2 to debug drivers, and 4 to debug governors.");
181 181
182 module_param(debug_ratelimit, uint, 0644); 182 module_param(debug_ratelimit, uint, 0644);
183 MODULE_PARM_DESC(debug_ratelimit, "CPUfreq debugging: set to 0 to disable ratelimiting."); 183 MODULE_PARM_DESC(debug_ratelimit, "CPUfreq debugging: set to 0 to disable ratelimiting.");
184 184
185 #else /* !CONFIG_CPU_FREQ_DEBUG */ 185 #else /* !CONFIG_CPU_FREQ_DEBUG */
186 186
187 static inline void cpufreq_debug_enable_ratelimit(void) { return; } 187 static inline void cpufreq_debug_enable_ratelimit(void) { return; }
188 static inline void cpufreq_debug_disable_ratelimit(void) { return; } 188 static inline void cpufreq_debug_disable_ratelimit(void) { return; }
189 189
190 #endif /* CONFIG_CPU_FREQ_DEBUG */ 190 #endif /* CONFIG_CPU_FREQ_DEBUG */
191 191
192 192
193 /********************************************************************* 193 /*********************************************************************
194 * EXTERNALLY AFFECTING FREQUENCY CHANGES * 194 * EXTERNALLY AFFECTING FREQUENCY CHANGES *
195 *********************************************************************/ 195 *********************************************************************/
196 196
197 /** 197 /**
198 * adjust_jiffies - adjust the system "loops_per_jiffy" 198 * adjust_jiffies - adjust the system "loops_per_jiffy"
199 * 199 *
200 * This function alters the system "loops_per_jiffy" for the clock 200 * This function alters the system "loops_per_jiffy" for the clock
201 * speed change. Note that loops_per_jiffy cannot be updated on SMP 201 * speed change. Note that loops_per_jiffy cannot be updated on SMP
202 * systems as each CPU might be scaled differently. So, use the arch 202 * systems as each CPU might be scaled differently. So, use the arch
203 * per-CPU loops_per_jiffy value wherever possible. 203 * per-CPU loops_per_jiffy value wherever possible.
204 */ 204 */
205 #ifndef CONFIG_SMP 205 #ifndef CONFIG_SMP
206 static unsigned long l_p_j_ref; 206 static unsigned long l_p_j_ref;
207 static unsigned int l_p_j_ref_freq; 207 static unsigned int l_p_j_ref_freq;
208 208
209 static void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci) 209 static void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci)
210 { 210 {
211 if (ci->flags & CPUFREQ_CONST_LOOPS) 211 if (ci->flags & CPUFREQ_CONST_LOOPS)
212 return; 212 return;
213 213
214 if (!l_p_j_ref_freq) { 214 if (!l_p_j_ref_freq) {
215 l_p_j_ref = loops_per_jiffy; 215 l_p_j_ref = loops_per_jiffy;
216 l_p_j_ref_freq = ci->old; 216 l_p_j_ref_freq = ci->old;
217 dprintk("saving %lu as reference value for loops_per_jiffy; freq is %u kHz\n", l_p_j_ref, l_p_j_ref_freq); 217 dprintk("saving %lu as reference value for loops_per_jiffy; freq is %u kHz\n", l_p_j_ref, l_p_j_ref_freq);
218 } 218 }
219 if ((val == CPUFREQ_PRECHANGE && ci->old < ci->new) || 219 if ((val == CPUFREQ_PRECHANGE && ci->old < ci->new) ||
220 (val == CPUFREQ_POSTCHANGE && ci->old > ci->new) || 220 (val == CPUFREQ_POSTCHANGE && ci->old > ci->new) ||
221 (val == CPUFREQ_RESUMECHANGE || val == CPUFREQ_SUSPENDCHANGE)) { 221 (val == CPUFREQ_RESUMECHANGE || val == CPUFREQ_SUSPENDCHANGE)) {
222 loops_per_jiffy = cpufreq_scale(l_p_j_ref, l_p_j_ref_freq, ci->new); 222 loops_per_jiffy = cpufreq_scale(l_p_j_ref, l_p_j_ref_freq, ci->new);
223 dprintk("scaling loops_per_jiffy to %lu for frequency %u kHz\n", loops_per_jiffy, ci->new); 223 dprintk("scaling loops_per_jiffy to %lu for frequency %u kHz\n", loops_per_jiffy, ci->new);
224 } 224 }
225 } 225 }
226 #else 226 #else
227 static inline void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci) { return; } 227 static inline void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci) { return; }
228 #endif 228 #endif
229 229
230 230
231 /** 231 /**
232 * cpufreq_notify_transition - call notifier chain and adjust_jiffies 232 * cpufreq_notify_transition - call notifier chain and adjust_jiffies
233 * on frequency transition. 233 * on frequency transition.
234 * 234 *
235 * This function calls the transition notifiers and the "adjust_jiffies" 235 * This function calls the transition notifiers and the "adjust_jiffies"
236 * function. It is called twice on all CPU frequency changes that have 236 * function. It is called twice on all CPU frequency changes that have
237 * external effects. 237 * external effects.
238 */ 238 */
239 void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state) 239 void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state)
240 { 240 {
241 struct cpufreq_policy *policy; 241 struct cpufreq_policy *policy;
242 242
243 BUG_ON(irqs_disabled()); 243 BUG_ON(irqs_disabled());
244 244
245 freqs->flags = cpufreq_driver->flags; 245 freqs->flags = cpufreq_driver->flags;
246 dprintk("notification %u of frequency transition to %u kHz\n", 246 dprintk("notification %u of frequency transition to %u kHz\n",
247 state, freqs->new); 247 state, freqs->new);
248 248
249 policy = cpufreq_cpu_data[freqs->cpu]; 249 policy = cpufreq_cpu_data[freqs->cpu];
250 switch (state) { 250 switch (state) {
251 251
252 case CPUFREQ_PRECHANGE: 252 case CPUFREQ_PRECHANGE:
253 /* detect if the driver reported a value as "old frequency" 253 /* detect if the driver reported a value as "old frequency"
254 * which is not equal to what the cpufreq core thinks is 254 * which is not equal to what the cpufreq core thinks is
255 * "old frequency". 255 * "old frequency".
256 */ 256 */
257 if (!(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) { 257 if (!(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) {
258 if ((policy) && (policy->cpu == freqs->cpu) && 258 if ((policy) && (policy->cpu == freqs->cpu) &&
259 (policy->cur) && (policy->cur != freqs->old)) { 259 (policy->cur) && (policy->cur != freqs->old)) {
260 dprintk(KERN_WARNING "Warning: CPU frequency is" 260 dprintk(KERN_WARNING "Warning: CPU frequency is"
261 " %u, cpufreq assumed %u kHz.\n", 261 " %u, cpufreq assumed %u kHz.\n",
262 freqs->old, policy->cur); 262 freqs->old, policy->cur);
263 freqs->old = policy->cur; 263 freqs->old = policy->cur;
264 } 264 }
265 } 265 }
266 blocking_notifier_call_chain(&cpufreq_transition_notifier_list, 266 blocking_notifier_call_chain(&cpufreq_transition_notifier_list,
267 CPUFREQ_PRECHANGE, freqs); 267 CPUFREQ_PRECHANGE, freqs);
268 adjust_jiffies(CPUFREQ_PRECHANGE, freqs); 268 adjust_jiffies(CPUFREQ_PRECHANGE, freqs);
269 break; 269 break;
270 270
271 case CPUFREQ_POSTCHANGE: 271 case CPUFREQ_POSTCHANGE:
272 adjust_jiffies(CPUFREQ_POSTCHANGE, freqs); 272 adjust_jiffies(CPUFREQ_POSTCHANGE, freqs);
273 blocking_notifier_call_chain(&cpufreq_transition_notifier_list, 273 blocking_notifier_call_chain(&cpufreq_transition_notifier_list,
274 CPUFREQ_POSTCHANGE, freqs); 274 CPUFREQ_POSTCHANGE, freqs);
275 if (likely(policy) && likely(policy->cpu == freqs->cpu)) 275 if (likely(policy) && likely(policy->cpu == freqs->cpu))
276 policy->cur = freqs->new; 276 policy->cur = freqs->new;
277 break; 277 break;
278 } 278 }
279 } 279 }
280 EXPORT_SYMBOL_GPL(cpufreq_notify_transition); 280 EXPORT_SYMBOL_GPL(cpufreq_notify_transition);
281 281
282 282
283 283
284 /********************************************************************* 284 /*********************************************************************
285 * SYSFS INTERFACE * 285 * SYSFS INTERFACE *
286 *********************************************************************/ 286 *********************************************************************/
287 287
288 /** 288 /**
289 * cpufreq_parse_governor - parse a governor string 289 * cpufreq_parse_governor - parse a governor string
290 */ 290 */
291 static int cpufreq_parse_governor (char *str_governor, unsigned int *policy, 291 static int cpufreq_parse_governor (char *str_governor, unsigned int *policy,
292 struct cpufreq_governor **governor) 292 struct cpufreq_governor **governor)
293 { 293 {
294 if (!cpufreq_driver) 294 if (!cpufreq_driver)
295 return -EINVAL; 295 return -EINVAL;
296 if (cpufreq_driver->setpolicy) { 296 if (cpufreq_driver->setpolicy) {
297 if (!strnicmp(str_governor, "performance", CPUFREQ_NAME_LEN)) { 297 if (!strnicmp(str_governor, "performance", CPUFREQ_NAME_LEN)) {
298 *policy = CPUFREQ_POLICY_PERFORMANCE; 298 *policy = CPUFREQ_POLICY_PERFORMANCE;
299 return 0; 299 return 0;
300 } else if (!strnicmp(str_governor, "powersave", CPUFREQ_NAME_LEN)) { 300 } else if (!strnicmp(str_governor, "powersave", CPUFREQ_NAME_LEN)) {
301 *policy = CPUFREQ_POLICY_POWERSAVE; 301 *policy = CPUFREQ_POLICY_POWERSAVE;
302 return 0; 302 return 0;
303 } 303 }
304 return -EINVAL; 304 return -EINVAL;
305 } else { 305 } else {
306 struct cpufreq_governor *t; 306 struct cpufreq_governor *t;
307 mutex_lock(&cpufreq_governor_mutex); 307 mutex_lock(&cpufreq_governor_mutex);
308 if (!cpufreq_driver || !cpufreq_driver->target) 308 if (!cpufreq_driver || !cpufreq_driver->target)
309 goto out; 309 goto out;
310 list_for_each_entry(t, &cpufreq_governor_list, governor_list) { 310 list_for_each_entry(t, &cpufreq_governor_list, governor_list) {
311 if (!strnicmp(str_governor,t->name,CPUFREQ_NAME_LEN)) { 311 if (!strnicmp(str_governor,t->name,CPUFREQ_NAME_LEN)) {
312 *governor = t; 312 *governor = t;
313 mutex_unlock(&cpufreq_governor_mutex); 313 mutex_unlock(&cpufreq_governor_mutex);
314 return 0; 314 return 0;
315 } 315 }
316 } 316 }
317 out: 317 out:
318 mutex_unlock(&cpufreq_governor_mutex); 318 mutex_unlock(&cpufreq_governor_mutex);
319 } 319 }
320 return -EINVAL; 320 return -EINVAL;
321 } 321 }
322 EXPORT_SYMBOL_GPL(cpufreq_parse_governor);
323 322
324 323
325 /* drivers/base/cpu.c */ 324 /* drivers/base/cpu.c */
326 extern struct sysdev_class cpu_sysdev_class; 325 extern struct sysdev_class cpu_sysdev_class;
327 326
328 327
329 /** 328 /**
330 * cpufreq_per_cpu_attr_read() / show_##file_name() - print out cpufreq information 329 * cpufreq_per_cpu_attr_read() / show_##file_name() - print out cpufreq information
331 * 330 *
332 * Write out information from cpufreq_driver->policy[cpu]; object must be 331 * Write out information from cpufreq_driver->policy[cpu]; object must be
333 * "unsigned int". 332 * "unsigned int".
334 */ 333 */
335 334
336 #define show_one(file_name, object) \ 335 #define show_one(file_name, object) \
337 static ssize_t show_##file_name \ 336 static ssize_t show_##file_name \
338 (struct cpufreq_policy * policy, char *buf) \ 337 (struct cpufreq_policy * policy, char *buf) \
339 { \ 338 { \
340 return sprintf (buf, "%u\n", policy->object); \ 339 return sprintf (buf, "%u\n", policy->object); \
341 } 340 }
342 341
343 show_one(cpuinfo_min_freq, cpuinfo.min_freq); 342 show_one(cpuinfo_min_freq, cpuinfo.min_freq);
344 show_one(cpuinfo_max_freq, cpuinfo.max_freq); 343 show_one(cpuinfo_max_freq, cpuinfo.max_freq);
345 show_one(scaling_min_freq, min); 344 show_one(scaling_min_freq, min);
346 show_one(scaling_max_freq, max); 345 show_one(scaling_max_freq, max);
347 show_one(scaling_cur_freq, cur); 346 show_one(scaling_cur_freq, cur);
348 347
349 static int __cpufreq_set_policy(struct cpufreq_policy *data, struct cpufreq_policy *policy); 348 static int __cpufreq_set_policy(struct cpufreq_policy *data, struct cpufreq_policy *policy);
350 349
351 /** 350 /**
352 * cpufreq_per_cpu_attr_write() / store_##file_name() - sysfs write access 351 * cpufreq_per_cpu_attr_write() / store_##file_name() - sysfs write access
353 */ 352 */
354 #define store_one(file_name, object) \ 353 #define store_one(file_name, object) \
355 static ssize_t store_##file_name \ 354 static ssize_t store_##file_name \
356 (struct cpufreq_policy * policy, const char *buf, size_t count) \ 355 (struct cpufreq_policy * policy, const char *buf, size_t count) \
357 { \ 356 { \
358 unsigned int ret = -EINVAL; \ 357 unsigned int ret = -EINVAL; \
359 struct cpufreq_policy new_policy; \ 358 struct cpufreq_policy new_policy; \
360 \ 359 \
361 ret = cpufreq_get_policy(&new_policy, policy->cpu); \ 360 ret = cpufreq_get_policy(&new_policy, policy->cpu); \
362 if (ret) \ 361 if (ret) \
363 return -EINVAL; \ 362 return -EINVAL; \
364 \ 363 \
365 ret = sscanf (buf, "%u", &new_policy.object); \ 364 ret = sscanf (buf, "%u", &new_policy.object); \
366 if (ret != 1) \ 365 if (ret != 1) \
367 return -EINVAL; \ 366 return -EINVAL; \
368 \ 367 \
369 mutex_lock(&policy->lock); \ 368 mutex_lock(&policy->lock); \
370 ret = __cpufreq_set_policy(policy, &new_policy); \ 369 ret = __cpufreq_set_policy(policy, &new_policy); \
371 policy->user_policy.object = policy->object; \ 370 policy->user_policy.object = policy->object; \
372 mutex_unlock(&policy->lock); \ 371 mutex_unlock(&policy->lock); \
373 \ 372 \
374 return ret ? ret : count; \ 373 return ret ? ret : count; \
375 } 374 }
376 375
377 store_one(scaling_min_freq,min); 376 store_one(scaling_min_freq,min);
378 store_one(scaling_max_freq,max); 377 store_one(scaling_max_freq,max);
379 378
380 /** 379 /**
381 * show_cpuinfo_cur_freq - current CPU frequency as detected by hardware 380 * show_cpuinfo_cur_freq - current CPU frequency as detected by hardware
382 */ 381 */
383 static ssize_t show_cpuinfo_cur_freq (struct cpufreq_policy * policy, char *buf) 382 static ssize_t show_cpuinfo_cur_freq (struct cpufreq_policy * policy, char *buf)
384 { 383 {
385 unsigned int cur_freq = cpufreq_get(policy->cpu); 384 unsigned int cur_freq = cpufreq_get(policy->cpu);
386 if (!cur_freq) 385 if (!cur_freq)
387 return sprintf(buf, "<unknown>"); 386 return sprintf(buf, "<unknown>");
388 return sprintf(buf, "%u\n", cur_freq); 387 return sprintf(buf, "%u\n", cur_freq);
389 } 388 }
390 389
391 390
392 /** 391 /**
393 * show_scaling_governor - show the current policy for the specified CPU 392 * show_scaling_governor - show the current policy for the specified CPU
394 */ 393 */
395 static ssize_t show_scaling_governor (struct cpufreq_policy * policy, char *buf) 394 static ssize_t show_scaling_governor (struct cpufreq_policy * policy, char *buf)
396 { 395 {
397 if(policy->policy == CPUFREQ_POLICY_POWERSAVE) 396 if(policy->policy == CPUFREQ_POLICY_POWERSAVE)
398 return sprintf(buf, "powersave\n"); 397 return sprintf(buf, "powersave\n");
399 else if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) 398 else if (policy->policy == CPUFREQ_POLICY_PERFORMANCE)
400 return sprintf(buf, "performance\n"); 399 return sprintf(buf, "performance\n");
401 else if (policy->governor) 400 else if (policy->governor)
402 return scnprintf(buf, CPUFREQ_NAME_LEN, "%s\n", policy->governor->name); 401 return scnprintf(buf, CPUFREQ_NAME_LEN, "%s\n", policy->governor->name);
403 return -EINVAL; 402 return -EINVAL;
404 } 403 }
405 404
406 405
407 /** 406 /**
408 * store_scaling_governor - store policy for the specified CPU 407 * store_scaling_governor - store policy for the specified CPU
409 */ 408 */
410 static ssize_t store_scaling_governor (struct cpufreq_policy * policy, 409 static ssize_t store_scaling_governor (struct cpufreq_policy * policy,
411 const char *buf, size_t count) 410 const char *buf, size_t count)
412 { 411 {
413 unsigned int ret = -EINVAL; 412 unsigned int ret = -EINVAL;
414 char str_governor[16]; 413 char str_governor[16];
415 struct cpufreq_policy new_policy; 414 struct cpufreq_policy new_policy;
416 415
417 ret = cpufreq_get_policy(&new_policy, policy->cpu); 416 ret = cpufreq_get_policy(&new_policy, policy->cpu);
418 if (ret) 417 if (ret)
419 return ret; 418 return ret;
420 419
421 ret = sscanf (buf, "%15s", str_governor); 420 ret = sscanf (buf, "%15s", str_governor);
422 if (ret != 1) 421 if (ret != 1)
423 return -EINVAL; 422 return -EINVAL;
424 423
425 if (cpufreq_parse_governor(str_governor, &new_policy.policy, &new_policy.governor)) 424 if (cpufreq_parse_governor(str_governor, &new_policy.policy, &new_policy.governor))
426 return -EINVAL; 425 return -EINVAL;
427 426
428 /* Do not use cpufreq_set_policy here or the user_policy.max 427 /* Do not use cpufreq_set_policy here or the user_policy.max
429 will be wrongly overridden */ 428 will be wrongly overridden */
430 mutex_lock(&policy->lock); 429 mutex_lock(&policy->lock);
431 ret = __cpufreq_set_policy(policy, &new_policy); 430 ret = __cpufreq_set_policy(policy, &new_policy);
432 431
433 policy->user_policy.policy = policy->policy; 432 policy->user_policy.policy = policy->policy;
434 policy->user_policy.governor = policy->governor; 433 policy->user_policy.governor = policy->governor;
435 mutex_unlock(&policy->lock); 434 mutex_unlock(&policy->lock);
436 435
437 return ret ? ret : count; 436 return ret ? ret : count;
438 } 437 }
439 438
440 /** 439 /**
441 * show_scaling_driver - show the cpufreq driver currently loaded 440 * show_scaling_driver - show the cpufreq driver currently loaded
442 */ 441 */
443 static ssize_t show_scaling_driver (struct cpufreq_policy * policy, char *buf) 442 static ssize_t show_scaling_driver (struct cpufreq_policy * policy, char *buf)
444 { 443 {
445 return scnprintf(buf, CPUFREQ_NAME_LEN, "%s\n", cpufreq_driver->name); 444 return scnprintf(buf, CPUFREQ_NAME_LEN, "%s\n", cpufreq_driver->name);
446 } 445 }
447 446
448 /** 447 /**
449 * show_scaling_available_governors - show the available CPUfreq governors 448 * show_scaling_available_governors - show the available CPUfreq governors
450 */ 449 */
451 static ssize_t show_scaling_available_governors (struct cpufreq_policy * policy, 450 static ssize_t show_scaling_available_governors (struct cpufreq_policy * policy,
452 char *buf) 451 char *buf)
453 { 452 {
454 ssize_t i = 0; 453 ssize_t i = 0;
455 struct cpufreq_governor *t; 454 struct cpufreq_governor *t;
456 455
457 if (!cpufreq_driver->target) { 456 if (!cpufreq_driver->target) {
458 i += sprintf(buf, "performance powersave"); 457 i += sprintf(buf, "performance powersave");
459 goto out; 458 goto out;
460 } 459 }
461 460
462 list_for_each_entry(t, &cpufreq_governor_list, governor_list) { 461 list_for_each_entry(t, &cpufreq_governor_list, governor_list) {
463 if (i >= (ssize_t) ((PAGE_SIZE / sizeof(char)) - (CPUFREQ_NAME_LEN + 2))) 462 if (i >= (ssize_t) ((PAGE_SIZE / sizeof(char)) - (CPUFREQ_NAME_LEN + 2)))
464 goto out; 463 goto out;
465 i += scnprintf(&buf[i], CPUFREQ_NAME_LEN, "%s ", t->name); 464 i += scnprintf(&buf[i], CPUFREQ_NAME_LEN, "%s ", t->name);
466 } 465 }
467 out: 466 out:
468 i += sprintf(&buf[i], "\n"); 467 i += sprintf(&buf[i], "\n");
469 return i; 468 return i;
470 } 469 }
471 /** 470 /**
472 * show_affected_cpus - show the CPUs affected by each transition 471 * show_affected_cpus - show the CPUs affected by each transition
473 */ 472 */
474 static ssize_t show_affected_cpus (struct cpufreq_policy * policy, char *buf) 473 static ssize_t show_affected_cpus (struct cpufreq_policy * policy, char *buf)
475 { 474 {
476 ssize_t i = 0; 475 ssize_t i = 0;
477 unsigned int cpu; 476 unsigned int cpu;
478 477
479 for_each_cpu_mask(cpu, policy->cpus) { 478 for_each_cpu_mask(cpu, policy->cpus) {
480 if (i) 479 if (i)
481 i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), " "); 480 i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), " ");
482 i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), "%u", cpu); 481 i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), "%u", cpu);
483 if (i >= (PAGE_SIZE - 5)) 482 if (i >= (PAGE_SIZE - 5))
484 break; 483 break;
485 } 484 }
486 i += sprintf(&buf[i], "\n"); 485 i += sprintf(&buf[i], "\n");
487 return i; 486 return i;
488 } 487 }
489 488
490 489
491 #define define_one_ro(_name) \ 490 #define define_one_ro(_name) \
492 static struct freq_attr _name = \ 491 static struct freq_attr _name = \
493 __ATTR(_name, 0444, show_##_name, NULL) 492 __ATTR(_name, 0444, show_##_name, NULL)
494 493
495 #define define_one_ro0400(_name) \ 494 #define define_one_ro0400(_name) \
496 static struct freq_attr _name = \ 495 static struct freq_attr _name = \
497 __ATTR(_name, 0400, show_##_name, NULL) 496 __ATTR(_name, 0400, show_##_name, NULL)
498 497
499 #define define_one_rw(_name) \ 498 #define define_one_rw(_name) \
500 static struct freq_attr _name = \ 499 static struct freq_attr _name = \
501 __ATTR(_name, 0644, show_##_name, store_##_name) 500 __ATTR(_name, 0644, show_##_name, store_##_name)
502 501
503 define_one_ro0400(cpuinfo_cur_freq); 502 define_one_ro0400(cpuinfo_cur_freq);
504 define_one_ro(cpuinfo_min_freq); 503 define_one_ro(cpuinfo_min_freq);
505 define_one_ro(cpuinfo_max_freq); 504 define_one_ro(cpuinfo_max_freq);
506 define_one_ro(scaling_available_governors); 505 define_one_ro(scaling_available_governors);
507 define_one_ro(scaling_driver); 506 define_one_ro(scaling_driver);
508 define_one_ro(scaling_cur_freq); 507 define_one_ro(scaling_cur_freq);
509 define_one_ro(affected_cpus); 508 define_one_ro(affected_cpus);
510 define_one_rw(scaling_min_freq); 509 define_one_rw(scaling_min_freq);
511 define_one_rw(scaling_max_freq); 510 define_one_rw(scaling_max_freq);
512 define_one_rw(scaling_governor); 511 define_one_rw(scaling_governor);
513 512
514 static struct attribute * default_attrs[] = { 513 static struct attribute * default_attrs[] = {
515 &cpuinfo_min_freq.attr, 514 &cpuinfo_min_freq.attr,
516 &cpuinfo_max_freq.attr, 515 &cpuinfo_max_freq.attr,
517 &scaling_min_freq.attr, 516 &scaling_min_freq.attr,
518 &scaling_max_freq.attr, 517 &scaling_max_freq.attr,
519 &affected_cpus.attr, 518 &affected_cpus.attr,
520 &scaling_governor.attr, 519 &scaling_governor.attr,
521 &scaling_driver.attr, 520 &scaling_driver.attr,
522 &scaling_available_governors.attr, 521 &scaling_available_governors.attr,
523 NULL 522 NULL
524 }; 523 };
525 524
526 #define to_policy(k) container_of(k,struct cpufreq_policy,kobj) 525 #define to_policy(k) container_of(k,struct cpufreq_policy,kobj)
527 #define to_attr(a) container_of(a,struct freq_attr,attr) 526 #define to_attr(a) container_of(a,struct freq_attr,attr)
528 527
529 static ssize_t show(struct kobject * kobj, struct attribute * attr ,char * buf) 528 static ssize_t show(struct kobject * kobj, struct attribute * attr ,char * buf)
530 { 529 {
531 struct cpufreq_policy * policy = to_policy(kobj); 530 struct cpufreq_policy * policy = to_policy(kobj);
532 struct freq_attr * fattr = to_attr(attr); 531 struct freq_attr * fattr = to_attr(attr);
533 ssize_t ret; 532 ssize_t ret;
534 policy = cpufreq_cpu_get(policy->cpu); 533 policy = cpufreq_cpu_get(policy->cpu);
535 if (!policy) 534 if (!policy)
536 return -EINVAL; 535 return -EINVAL;
537 ret = fattr->show ? fattr->show(policy,buf) : -EIO; 536 ret = fattr->show ? fattr->show(policy,buf) : -EIO;
538 cpufreq_cpu_put(policy); 537 cpufreq_cpu_put(policy);
539 return ret; 538 return ret;
540 } 539 }
541 540
542 static ssize_t store(struct kobject * kobj, struct attribute * attr, 541 static ssize_t store(struct kobject * kobj, struct attribute * attr,
543 const char * buf, size_t count) 542 const char * buf, size_t count)
544 { 543 {
545 struct cpufreq_policy * policy = to_policy(kobj); 544 struct cpufreq_policy * policy = to_policy(kobj);
546 struct freq_attr * fattr = to_attr(attr); 545 struct freq_attr * fattr = to_attr(attr);
547 ssize_t ret; 546 ssize_t ret;
548 policy = cpufreq_cpu_get(policy->cpu); 547 policy = cpufreq_cpu_get(policy->cpu);
549 if (!policy) 548 if (!policy)
550 return -EINVAL; 549 return -EINVAL;
551 ret = fattr->store ? fattr->store(policy,buf,count) : -EIO; 550 ret = fattr->store ? fattr->store(policy,buf,count) : -EIO;
552 cpufreq_cpu_put(policy); 551 cpufreq_cpu_put(policy);
553 return ret; 552 return ret;
554 } 553 }
555 554
556 static void cpufreq_sysfs_release(struct kobject * kobj) 555 static void cpufreq_sysfs_release(struct kobject * kobj)
557 { 556 {
558 struct cpufreq_policy * policy = to_policy(kobj); 557 struct cpufreq_policy * policy = to_policy(kobj);
559 dprintk("last reference is dropped\n"); 558 dprintk("last reference is dropped\n");
560 complete(&policy->kobj_unregister); 559 complete(&policy->kobj_unregister);
561 } 560 }
562 561
563 static struct sysfs_ops sysfs_ops = { 562 static struct sysfs_ops sysfs_ops = {
564 .show = show, 563 .show = show,
565 .store = store, 564 .store = store,
566 }; 565 };
567 566
568 static struct kobj_type ktype_cpufreq = { 567 static struct kobj_type ktype_cpufreq = {
569 .sysfs_ops = &sysfs_ops, 568 .sysfs_ops = &sysfs_ops,
570 .default_attrs = default_attrs, 569 .default_attrs = default_attrs,
571 .release = cpufreq_sysfs_release, 570 .release = cpufreq_sysfs_release,
572 }; 571 };
573 572
574 573
575 /** 574 /**
576 * cpufreq_add_dev - add a CPU device 575 * cpufreq_add_dev - add a CPU device
577 * 576 *
578 * Adds the cpufreq interface for a CPU device. 577 * Adds the cpufreq interface for a CPU device.
579 */ 578 */
580 static int cpufreq_add_dev (struct sys_device * sys_dev) 579 static int cpufreq_add_dev (struct sys_device * sys_dev)
581 { 580 {
582 unsigned int cpu = sys_dev->id; 581 unsigned int cpu = sys_dev->id;
583 int ret = 0; 582 int ret = 0;
584 struct cpufreq_policy new_policy; 583 struct cpufreq_policy new_policy;
585 struct cpufreq_policy *policy; 584 struct cpufreq_policy *policy;
586 struct freq_attr **drv_attr; 585 struct freq_attr **drv_attr;
587 struct sys_device *cpu_sys_dev; 586 struct sys_device *cpu_sys_dev;
588 unsigned long flags; 587 unsigned long flags;
589 unsigned int j; 588 unsigned int j;
590 #ifdef CONFIG_SMP 589 #ifdef CONFIG_SMP
591 struct cpufreq_policy *managed_policy; 590 struct cpufreq_policy *managed_policy;
592 #endif 591 #endif
593 592
594 if (cpu_is_offline(cpu)) 593 if (cpu_is_offline(cpu))
595 return 0; 594 return 0;
596 595
597 cpufreq_debug_disable_ratelimit(); 596 cpufreq_debug_disable_ratelimit();
598 dprintk("adding CPU %u\n", cpu); 597 dprintk("adding CPU %u\n", cpu);
599 598
600 #ifdef CONFIG_SMP 599 #ifdef CONFIG_SMP
601 /* check whether a different CPU already registered this 600 /* check whether a different CPU already registered this
602 * CPU because it is in the same boat. */ 601 * CPU because it is in the same boat. */
603 policy = cpufreq_cpu_get(cpu); 602 policy = cpufreq_cpu_get(cpu);
604 if (unlikely(policy)) { 603 if (unlikely(policy)) {
605 cpufreq_cpu_put(policy); 604 cpufreq_cpu_put(policy);
606 cpufreq_debug_enable_ratelimit(); 605 cpufreq_debug_enable_ratelimit();
607 return 0; 606 return 0;
608 } 607 }
609 #endif 608 #endif
610 609
611 if (!try_module_get(cpufreq_driver->owner)) { 610 if (!try_module_get(cpufreq_driver->owner)) {
612 ret = -EINVAL; 611 ret = -EINVAL;
613 goto module_out; 612 goto module_out;
614 } 613 }
615 614
616 policy = kzalloc(sizeof(struct cpufreq_policy), GFP_KERNEL); 615 policy = kzalloc(sizeof(struct cpufreq_policy), GFP_KERNEL);
617 if (!policy) { 616 if (!policy) {
618 ret = -ENOMEM; 617 ret = -ENOMEM;
619 goto nomem_out; 618 goto nomem_out;
620 } 619 }
621 620
622 policy->cpu = cpu; 621 policy->cpu = cpu;
623 policy->cpus = cpumask_of_cpu(cpu); 622 policy->cpus = cpumask_of_cpu(cpu);
624 623
625 mutex_init(&policy->lock); 624 mutex_init(&policy->lock);
626 mutex_lock(&policy->lock); 625 mutex_lock(&policy->lock);
627 init_completion(&policy->kobj_unregister); 626 init_completion(&policy->kobj_unregister);
628 INIT_WORK(&policy->update, handle_update, (void *)(long)cpu); 627 INIT_WORK(&policy->update, handle_update, (void *)(long)cpu);
629 628
630 /* call driver. From then on the cpufreq must be able 629 /* call driver. From then on the cpufreq must be able
631 * to accept all calls to ->verify and ->setpolicy for this CPU 630 * to accept all calls to ->verify and ->setpolicy for this CPU
632 */ 631 */
633 ret = cpufreq_driver->init(policy); 632 ret = cpufreq_driver->init(policy);
634 if (ret) { 633 if (ret) {
635 dprintk("initialization failed\n"); 634 dprintk("initialization failed\n");
636 mutex_unlock(&policy->lock); 635 mutex_unlock(&policy->lock);
637 goto err_out; 636 goto err_out;
638 } 637 }
639 638
640 #ifdef CONFIG_SMP 639 #ifdef CONFIG_SMP
641 for_each_cpu_mask(j, policy->cpus) { 640 for_each_cpu_mask(j, policy->cpus) {
642 if (cpu == j) 641 if (cpu == j)
643 continue; 642 continue;
644 643
645 /* check for existing affected CPUs. They may not be aware 644 /* check for existing affected CPUs. They may not be aware
646 * of it due to CPU Hotplug. 645 * of it due to CPU Hotplug.
647 */ 646 */
648 managed_policy = cpufreq_cpu_get(j); 647 managed_policy = cpufreq_cpu_get(j);
649 if (unlikely(managed_policy)) { 648 if (unlikely(managed_policy)) {
650 spin_lock_irqsave(&cpufreq_driver_lock, flags); 649 spin_lock_irqsave(&cpufreq_driver_lock, flags);
651 managed_policy->cpus = policy->cpus; 650 managed_policy->cpus = policy->cpus;
652 cpufreq_cpu_data[cpu] = managed_policy; 651 cpufreq_cpu_data[cpu] = managed_policy;
653 spin_unlock_irqrestore(&cpufreq_driver_lock, flags); 652 spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
654 653
655 dprintk("CPU already managed, adding link\n"); 654 dprintk("CPU already managed, adding link\n");
656 sysfs_create_link(&sys_dev->kobj, 655 sysfs_create_link(&sys_dev->kobj,
657 &managed_policy->kobj, "cpufreq"); 656 &managed_policy->kobj, "cpufreq");
658 657
659 cpufreq_debug_enable_ratelimit(); 658 cpufreq_debug_enable_ratelimit();
660 mutex_unlock(&policy->lock); 659 mutex_unlock(&policy->lock);
661 ret = 0; 660 ret = 0;
662 goto err_out_driver_exit; /* call driver->exit() */ 661 goto err_out_driver_exit; /* call driver->exit() */
663 } 662 }
664 } 663 }
665 #endif 664 #endif
666 memcpy(&new_policy, policy, sizeof(struct cpufreq_policy)); 665 memcpy(&new_policy, policy, sizeof(struct cpufreq_policy));
667 666
668 /* prepare interface data */ 667 /* prepare interface data */
669 policy->kobj.parent = &sys_dev->kobj; 668 policy->kobj.parent = &sys_dev->kobj;
670 policy->kobj.ktype = &ktype_cpufreq; 669 policy->kobj.ktype = &ktype_cpufreq;
671 strlcpy(policy->kobj.name, "cpufreq", KOBJ_NAME_LEN); 670 strlcpy(policy->kobj.name, "cpufreq", KOBJ_NAME_LEN);
672 671
673 ret = kobject_register(&policy->kobj); 672 ret = kobject_register(&policy->kobj);
674 if (ret) { 673 if (ret) {
675 mutex_unlock(&policy->lock); 674 mutex_unlock(&policy->lock);
676 goto err_out_driver_exit; 675 goto err_out_driver_exit;
677 } 676 }
678 /* set up files for this cpu device */ 677 /* set up files for this cpu device */
679 drv_attr = cpufreq_driver->attr; 678 drv_attr = cpufreq_driver->attr;
680 while ((drv_attr) && (*drv_attr)) { 679 while ((drv_attr) && (*drv_attr)) {
681 sysfs_create_file(&policy->kobj, &((*drv_attr)->attr)); 680 sysfs_create_file(&policy->kobj, &((*drv_attr)->attr));
682 drv_attr++; 681 drv_attr++;
683 } 682 }
684 if (cpufreq_driver->get) 683 if (cpufreq_driver->get)
685 sysfs_create_file(&policy->kobj, &cpuinfo_cur_freq.attr); 684 sysfs_create_file(&policy->kobj, &cpuinfo_cur_freq.attr);
686 if (cpufreq_driver->target) 685 if (cpufreq_driver->target)
687 sysfs_create_file(&policy->kobj, &scaling_cur_freq.attr); 686 sysfs_create_file(&policy->kobj, &scaling_cur_freq.attr);
688 687
689 spin_lock_irqsave(&cpufreq_driver_lock, flags); 688 spin_lock_irqsave(&cpufreq_driver_lock, flags);
690 for_each_cpu_mask(j, policy->cpus) 689 for_each_cpu_mask(j, policy->cpus)
691 cpufreq_cpu_data[j] = policy; 690 cpufreq_cpu_data[j] = policy;
692 spin_unlock_irqrestore(&cpufreq_driver_lock, flags); 691 spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
693 692
694 /* symlink affected CPUs */ 693 /* symlink affected CPUs */
695 for_each_cpu_mask(j, policy->cpus) { 694 for_each_cpu_mask(j, policy->cpus) {
696 if (j == cpu) 695 if (j == cpu)
697 continue; 696 continue;
698 if (!cpu_online(j)) 697 if (!cpu_online(j))
699 continue; 698 continue;
700 699
701 dprintk("CPU %u already managed, adding link\n", j); 700 dprintk("CPU %u already managed, adding link\n", j);
702 cpufreq_cpu_get(cpu); 701 cpufreq_cpu_get(cpu);
703 cpu_sys_dev = get_cpu_sysdev(j); 702 cpu_sys_dev = get_cpu_sysdev(j);
704 sysfs_create_link(&cpu_sys_dev->kobj, &policy->kobj, 703 sysfs_create_link(&cpu_sys_dev->kobj, &policy->kobj,
705 "cpufreq"); 704 "cpufreq");
706 } 705 }
707 706
708 policy->governor = NULL; /* to assure that the starting sequence is 707 policy->governor = NULL; /* to assure that the starting sequence is
709 * run in cpufreq_set_policy */ 708 * run in cpufreq_set_policy */
710 mutex_unlock(&policy->lock); 709 mutex_unlock(&policy->lock);
711 710
712 /* set default policy */ 711 /* set default policy */
713 ret = cpufreq_set_policy(&new_policy); 712 ret = cpufreq_set_policy(&new_policy);
714 if (ret) { 713 if (ret) {
715 dprintk("setting policy failed\n"); 714 dprintk("setting policy failed\n");
716 goto err_out_unregister; 715 goto err_out_unregister;
717 } 716 }
718 717
719 module_put(cpufreq_driver->owner); 718 module_put(cpufreq_driver->owner);
720 dprintk("initialization complete\n"); 719 dprintk("initialization complete\n");
721 cpufreq_debug_enable_ratelimit(); 720 cpufreq_debug_enable_ratelimit();
722 721
723 return 0; 722 return 0;
724 723
725 724
726 err_out_unregister: 725 err_out_unregister:
727 spin_lock_irqsave(&cpufreq_driver_lock, flags); 726 spin_lock_irqsave(&cpufreq_driver_lock, flags);
728 for_each_cpu_mask(j, policy->cpus) 727 for_each_cpu_mask(j, policy->cpus)
729 cpufreq_cpu_data[j] = NULL; 728 cpufreq_cpu_data[j] = NULL;
730 spin_unlock_irqrestore(&cpufreq_driver_lock, flags); 729 spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
731 730
732 kobject_unregister(&policy->kobj); 731 kobject_unregister(&policy->kobj);
733 wait_for_completion(&policy->kobj_unregister); 732 wait_for_completion(&policy->kobj_unregister);
734 733
735 err_out_driver_exit: 734 err_out_driver_exit:
736 if (cpufreq_driver->exit) 735 if (cpufreq_driver->exit)
737 cpufreq_driver->exit(policy); 736 cpufreq_driver->exit(policy);
738 737
739 err_out: 738 err_out:
740 kfree(policy); 739 kfree(policy);
741 740
742 nomem_out: 741 nomem_out:
743 module_put(cpufreq_driver->owner); 742 module_put(cpufreq_driver->owner);
744 module_out: 743 module_out:
745 cpufreq_debug_enable_ratelimit(); 744 cpufreq_debug_enable_ratelimit();
746 return ret; 745 return ret;
747 } 746 }
748 747
749 748
750 /** 749 /**
751 * cpufreq_remove_dev - remove a CPU device 750 * cpufreq_remove_dev - remove a CPU device
752 * 751 *
753 * Removes the cpufreq interface for a CPU device. 752 * Removes the cpufreq interface for a CPU device.
754 */ 753 */
755 static int cpufreq_remove_dev (struct sys_device * sys_dev) 754 static int cpufreq_remove_dev (struct sys_device * sys_dev)
756 { 755 {
757 unsigned int cpu = sys_dev->id; 756 unsigned int cpu = sys_dev->id;
758 unsigned long flags; 757 unsigned long flags;
759 struct cpufreq_policy *data; 758 struct cpufreq_policy *data;
760 #ifdef CONFIG_SMP 759 #ifdef CONFIG_SMP
761 struct sys_device *cpu_sys_dev; 760 struct sys_device *cpu_sys_dev;
762 unsigned int j; 761 unsigned int j;
763 #endif 762 #endif
764 763
765 cpufreq_debug_disable_ratelimit(); 764 cpufreq_debug_disable_ratelimit();
766 dprintk("unregistering CPU %u\n", cpu); 765 dprintk("unregistering CPU %u\n", cpu);
767 766
768 spin_lock_irqsave(&cpufreq_driver_lock, flags); 767 spin_lock_irqsave(&cpufreq_driver_lock, flags);
769 data = cpufreq_cpu_data[cpu]; 768 data = cpufreq_cpu_data[cpu];
770 769
771 if (!data) { 770 if (!data) {
772 spin_unlock_irqrestore(&cpufreq_driver_lock, flags); 771 spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
773 cpufreq_debug_enable_ratelimit(); 772 cpufreq_debug_enable_ratelimit();
774 return -EINVAL; 773 return -EINVAL;
775 } 774 }
776 cpufreq_cpu_data[cpu] = NULL; 775 cpufreq_cpu_data[cpu] = NULL;
777 776
778 777
779 #ifdef CONFIG_SMP 778 #ifdef CONFIG_SMP
780 /* if this isn't the CPU which is the parent of the kobj, we 779 /* if this isn't the CPU which is the parent of the kobj, we
781 * only need to unlink, put and exit 780 * only need to unlink, put and exit
782 */ 781 */
783 if (unlikely(cpu != data->cpu)) { 782 if (unlikely(cpu != data->cpu)) {
784 dprintk("removing link\n"); 783 dprintk("removing link\n");
785 cpu_clear(cpu, data->cpus); 784 cpu_clear(cpu, data->cpus);
786 spin_unlock_irqrestore(&cpufreq_driver_lock, flags); 785 spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
787 sysfs_remove_link(&sys_dev->kobj, "cpufreq"); 786 sysfs_remove_link(&sys_dev->kobj, "cpufreq");
788 cpufreq_cpu_put(data); 787 cpufreq_cpu_put(data);
789 cpufreq_debug_enable_ratelimit(); 788 cpufreq_debug_enable_ratelimit();
790 return 0; 789 return 0;
791 } 790 }
792 #endif 791 #endif
793 792
794 793
795 if (!kobject_get(&data->kobj)) { 794 if (!kobject_get(&data->kobj)) {
796 spin_unlock_irqrestore(&cpufreq_driver_lock, flags); 795 spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
797 cpufreq_debug_enable_ratelimit(); 796 cpufreq_debug_enable_ratelimit();
798 return -EFAULT; 797 return -EFAULT;
799 } 798 }
800 799
801 #ifdef CONFIG_SMP 800 #ifdef CONFIG_SMP
802 /* if we have other CPUs still registered, we need to unlink them, 801 /* if we have other CPUs still registered, we need to unlink them,
803 * or else wait_for_completion below will lock up. Clean the 802 * or else wait_for_completion below will lock up. Clean the
804 * cpufreq_cpu_data[] while holding the lock, and remove the sysfs 803 * cpufreq_cpu_data[] while holding the lock, and remove the sysfs
805 * links afterwards. 804 * links afterwards.
806 */ 805 */
807 if (unlikely(cpus_weight(data->cpus) > 1)) { 806 if (unlikely(cpus_weight(data->cpus) > 1)) {
808 for_each_cpu_mask(j, data->cpus) { 807 for_each_cpu_mask(j, data->cpus) {
809 if (j == cpu) 808 if (j == cpu)
810 continue; 809 continue;
811 cpufreq_cpu_data[j] = NULL; 810 cpufreq_cpu_data[j] = NULL;
812 } 811 }
813 } 812 }
814 813
815 spin_unlock_irqrestore(&cpufreq_driver_lock, flags); 814 spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
816 815
817 if (unlikely(cpus_weight(data->cpus) > 1)) { 816 if (unlikely(cpus_weight(data->cpus) > 1)) {
818 for_each_cpu_mask(j, data->cpus) { 817 for_each_cpu_mask(j, data->cpus) {
819 if (j == cpu) 818 if (j == cpu)
820 continue; 819 continue;
821 dprintk("removing link for cpu %u\n", j); 820 dprintk("removing link for cpu %u\n", j);
822 cpu_sys_dev = get_cpu_sysdev(j); 821 cpu_sys_dev = get_cpu_sysdev(j);
823 sysfs_remove_link(&cpu_sys_dev->kobj, "cpufreq"); 822 sysfs_remove_link(&cpu_sys_dev->kobj, "cpufreq");
824 cpufreq_cpu_put(data); 823 cpufreq_cpu_put(data);
825 } 824 }
826 } 825 }
827 #else 826 #else
828 spin_unlock_irqrestore(&cpufreq_driver_lock, flags); 827 spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
829 #endif 828 #endif
830 829
831 mutex_lock(&data->lock); 830 mutex_lock(&data->lock);
832 if (cpufreq_driver->target) 831 if (cpufreq_driver->target)
833 __cpufreq_governor(data, CPUFREQ_GOV_STOP); 832 __cpufreq_governor(data, CPUFREQ_GOV_STOP);
834 mutex_unlock(&data->lock); 833 mutex_unlock(&data->lock);
835 834
836 kobject_unregister(&data->kobj); 835 kobject_unregister(&data->kobj);
837 836
838 kobject_put(&data->kobj); 837 kobject_put(&data->kobj);
839 838
840 /* we need to make sure that the underlying kobj is actually 839 /* we need to make sure that the underlying kobj is actually
841 * not referenced anymore by anybody before we proceed with 840 * not referenced anymore by anybody before we proceed with
842 * unloading. 841 * unloading.
843 */ 842 */
844 dprintk("waiting for dropping of refcount\n"); 843 dprintk("waiting for dropping of refcount\n");
845 wait_for_completion(&data->kobj_unregister); 844 wait_for_completion(&data->kobj_unregister);
846 dprintk("wait complete\n"); 845 dprintk("wait complete\n");
847 846
848 if (cpufreq_driver->exit) 847 if (cpufreq_driver->exit)
849 cpufreq_driver->exit(data); 848 cpufreq_driver->exit(data);
850 849
851 kfree(data); 850 kfree(data);
852 851
853 cpufreq_debug_enable_ratelimit(); 852 cpufreq_debug_enable_ratelimit();
854 return 0; 853 return 0;
855 } 854 }
856 855
857 856
858 static void handle_update(void *data) 857 static void handle_update(void *data)
859 { 858 {
860 unsigned int cpu = (unsigned int)(long)data; 859 unsigned int cpu = (unsigned int)(long)data;
861 dprintk("handle_update for cpu %u called\n", cpu); 860 dprintk("handle_update for cpu %u called\n", cpu);
862 cpufreq_update_policy(cpu); 861 cpufreq_update_policy(cpu);
863 } 862 }
864 863
865 /** 864 /**
866 * cpufreq_out_of_sync - If actual and saved CPU frequency differs, we're in deep trouble. 865 * cpufreq_out_of_sync - If actual and saved CPU frequency differs, we're in deep trouble.
867 * @cpu: cpu number 866 * @cpu: cpu number
868 * @old_freq: CPU frequency the kernel thinks the CPU runs at 867 * @old_freq: CPU frequency the kernel thinks the CPU runs at
869 * @new_freq: CPU frequency the CPU actually runs at 868 * @new_freq: CPU frequency the CPU actually runs at
870 * 869 *
871 * We adjust to current frequency first, and need to clean up later. So either call 870 * We adjust to current frequency first, and need to clean up later. So either call
872 * to cpufreq_update_policy() or schedule handle_update()). 871 * to cpufreq_update_policy() or schedule handle_update()).
873 */ 872 */
874 static void cpufreq_out_of_sync(unsigned int cpu, unsigned int old_freq, unsigned int new_freq) 873 static void cpufreq_out_of_sync(unsigned int cpu, unsigned int old_freq, unsigned int new_freq)
875 { 874 {
876 struct cpufreq_freqs freqs; 875 struct cpufreq_freqs freqs;
877 876
878 dprintk(KERN_WARNING "Warning: CPU frequency out of sync: cpufreq and timing " 877 dprintk(KERN_WARNING "Warning: CPU frequency out of sync: cpufreq and timing "
879 "core thinks of %u, is %u kHz.\n", old_freq, new_freq); 878 "core thinks of %u, is %u kHz.\n", old_freq, new_freq);
880 879
881 freqs.cpu = cpu; 880 freqs.cpu = cpu;
882 freqs.old = old_freq; 881 freqs.old = old_freq;
883 freqs.new = new_freq; 882 freqs.new = new_freq;
884 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); 883 cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
885 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); 884 cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
886 } 885 }
887 886
888 887
889 /** 888 /**
890 * cpufreq_quick_get - get the CPU frequency (in kHz) frpm policy->cur 889 * cpufreq_quick_get - get the CPU frequency (in kHz) frpm policy->cur
891 * @cpu: CPU number 890 * @cpu: CPU number
892 * 891 *
893 * This is the last known freq, without actually getting it from the driver. 892 * This is the last known freq, without actually getting it from the driver.
894 * Return value will be same as what is shown in scaling_cur_freq in sysfs. 893 * Return value will be same as what is shown in scaling_cur_freq in sysfs.
895 */ 894 */
896 unsigned int cpufreq_quick_get(unsigned int cpu) 895 unsigned int cpufreq_quick_get(unsigned int cpu)
897 { 896 {
898 struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); 897 struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
899 unsigned int ret = 0; 898 unsigned int ret = 0;
900 899
901 if (policy) { 900 if (policy) {
902 mutex_lock(&policy->lock); 901 mutex_lock(&policy->lock);
903 ret = policy->cur; 902 ret = policy->cur;
904 mutex_unlock(&policy->lock); 903 mutex_unlock(&policy->lock);
905 cpufreq_cpu_put(policy); 904 cpufreq_cpu_put(policy);
906 } 905 }
907 906
908 return (ret); 907 return (ret);
909 } 908 }
910 EXPORT_SYMBOL(cpufreq_quick_get); 909 EXPORT_SYMBOL(cpufreq_quick_get);
911 910
912 911
913 /** 912 /**
914 * cpufreq_get - get the current CPU frequency (in kHz) 913 * cpufreq_get - get the current CPU frequency (in kHz)
915 * @cpu: CPU number 914 * @cpu: CPU number
916 * 915 *
917 * Get the CPU current (static) CPU frequency 916 * Get the CPU current (static) CPU frequency
918 */ 917 */
919 unsigned int cpufreq_get(unsigned int cpu) 918 unsigned int cpufreq_get(unsigned int cpu)
920 { 919 {
921 struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); 920 struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
922 unsigned int ret = 0; 921 unsigned int ret = 0;
923 922
924 if (!policy) 923 if (!policy)
925 return 0; 924 return 0;
926 925
927 if (!cpufreq_driver->get) 926 if (!cpufreq_driver->get)
928 goto out; 927 goto out;
929 928
930 mutex_lock(&policy->lock); 929 mutex_lock(&policy->lock);
931 930
932 ret = cpufreq_driver->get(cpu); 931 ret = cpufreq_driver->get(cpu);
933 932
934 if (ret && policy->cur && !(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) { 933 if (ret && policy->cur && !(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) {
935 /* verify no discrepancy between actual and saved value exists */ 934 /* verify no discrepancy between actual and saved value exists */
936 if (unlikely(ret != policy->cur)) { 935 if (unlikely(ret != policy->cur)) {
937 cpufreq_out_of_sync(cpu, policy->cur, ret); 936 cpufreq_out_of_sync(cpu, policy->cur, ret);
938 schedule_work(&policy->update); 937 schedule_work(&policy->update);
939 } 938 }
940 } 939 }
941 940
942 mutex_unlock(&policy->lock); 941 mutex_unlock(&policy->lock);
943 942
944 out: 943 out:
945 cpufreq_cpu_put(policy); 944 cpufreq_cpu_put(policy);
946 945
947 return (ret); 946 return (ret);
948 } 947 }
949 EXPORT_SYMBOL(cpufreq_get); 948 EXPORT_SYMBOL(cpufreq_get);
950 949
951 950
952 /** 951 /**
953 * cpufreq_suspend - let the low level driver prepare for suspend 952 * cpufreq_suspend - let the low level driver prepare for suspend
954 */ 953 */
955 954
956 static int cpufreq_suspend(struct sys_device * sysdev, pm_message_t pmsg) 955 static int cpufreq_suspend(struct sys_device * sysdev, pm_message_t pmsg)
957 { 956 {
958 int cpu = sysdev->id; 957 int cpu = sysdev->id;
959 unsigned int ret = 0; 958 unsigned int ret = 0;
960 unsigned int cur_freq = 0; 959 unsigned int cur_freq = 0;
961 struct cpufreq_policy *cpu_policy; 960 struct cpufreq_policy *cpu_policy;
962 961
963 dprintk("resuming cpu %u\n", cpu); 962 dprintk("resuming cpu %u\n", cpu);
964 963
965 if (!cpu_online(cpu)) 964 if (!cpu_online(cpu))
966 return 0; 965 return 0;
967 966
968 /* we may be lax here as interrupts are off. Nonetheless 967 /* we may be lax here as interrupts are off. Nonetheless
969 * we need to grab the correct cpu policy, as to check 968 * we need to grab the correct cpu policy, as to check
970 * whether we really run on this CPU. 969 * whether we really run on this CPU.
971 */ 970 */
972 971
973 cpu_policy = cpufreq_cpu_get(cpu); 972 cpu_policy = cpufreq_cpu_get(cpu);
974 if (!cpu_policy) 973 if (!cpu_policy)
975 return -EINVAL; 974 return -EINVAL;
976 975
977 /* only handle each CPU group once */ 976 /* only handle each CPU group once */
978 if (unlikely(cpu_policy->cpu != cpu)) { 977 if (unlikely(cpu_policy->cpu != cpu)) {
979 cpufreq_cpu_put(cpu_policy); 978 cpufreq_cpu_put(cpu_policy);
980 return 0; 979 return 0;
981 } 980 }
982 981
983 if (cpufreq_driver->suspend) { 982 if (cpufreq_driver->suspend) {
984 ret = cpufreq_driver->suspend(cpu_policy, pmsg); 983 ret = cpufreq_driver->suspend(cpu_policy, pmsg);
985 if (ret) { 984 if (ret) {
986 printk(KERN_ERR "cpufreq: suspend failed in ->suspend " 985 printk(KERN_ERR "cpufreq: suspend failed in ->suspend "
987 "step on CPU %u\n", cpu_policy->cpu); 986 "step on CPU %u\n", cpu_policy->cpu);
988 cpufreq_cpu_put(cpu_policy); 987 cpufreq_cpu_put(cpu_policy);
989 return ret; 988 return ret;
990 } 989 }
991 } 990 }
992 991
993 992
994 if (cpufreq_driver->flags & CPUFREQ_CONST_LOOPS) 993 if (cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)
995 goto out; 994 goto out;
996 995
997 if (cpufreq_driver->get) 996 if (cpufreq_driver->get)
998 cur_freq = cpufreq_driver->get(cpu_policy->cpu); 997 cur_freq = cpufreq_driver->get(cpu_policy->cpu);
999 998
1000 if (!cur_freq || !cpu_policy->cur) { 999 if (!cur_freq || !cpu_policy->cur) {
1001 printk(KERN_ERR "cpufreq: suspend failed to assert current " 1000 printk(KERN_ERR "cpufreq: suspend failed to assert current "
1002 "frequency is what timing core thinks it is.\n"); 1001 "frequency is what timing core thinks it is.\n");
1003 goto out; 1002 goto out;
1004 } 1003 }
1005 1004
1006 if (unlikely(cur_freq != cpu_policy->cur)) { 1005 if (unlikely(cur_freq != cpu_policy->cur)) {
1007 struct cpufreq_freqs freqs; 1006 struct cpufreq_freqs freqs;
1008 1007
1009 if (!(cpufreq_driver->flags & CPUFREQ_PM_NO_WARN)) 1008 if (!(cpufreq_driver->flags & CPUFREQ_PM_NO_WARN))
1010 dprintk(KERN_DEBUG "Warning: CPU frequency is %u, " 1009 dprintk(KERN_DEBUG "Warning: CPU frequency is %u, "
1011 "cpufreq assumed %u kHz.\n", 1010 "cpufreq assumed %u kHz.\n",
1012 cur_freq, cpu_policy->cur); 1011 cur_freq, cpu_policy->cur);
1013 1012
1014 freqs.cpu = cpu; 1013 freqs.cpu = cpu;
1015 freqs.old = cpu_policy->cur; 1014 freqs.old = cpu_policy->cur;
1016 freqs.new = cur_freq; 1015 freqs.new = cur_freq;
1017 1016
1018 blocking_notifier_call_chain(&cpufreq_transition_notifier_list, 1017 blocking_notifier_call_chain(&cpufreq_transition_notifier_list,
1019 CPUFREQ_SUSPENDCHANGE, &freqs); 1018 CPUFREQ_SUSPENDCHANGE, &freqs);
1020 adjust_jiffies(CPUFREQ_SUSPENDCHANGE, &freqs); 1019 adjust_jiffies(CPUFREQ_SUSPENDCHANGE, &freqs);
1021 1020
1022 cpu_policy->cur = cur_freq; 1021 cpu_policy->cur = cur_freq;
1023 } 1022 }
1024 1023
1025 out: 1024 out:
1026 cpufreq_cpu_put(cpu_policy); 1025 cpufreq_cpu_put(cpu_policy);
1027 return 0; 1026 return 0;
1028 } 1027 }
1029 1028
1030 /** 1029 /**
1031 * cpufreq_resume - restore proper CPU frequency handling after resume 1030 * cpufreq_resume - restore proper CPU frequency handling after resume
1032 * 1031 *
1033 * 1.) resume CPUfreq hardware support (cpufreq_driver->resume()) 1032 * 1.) resume CPUfreq hardware support (cpufreq_driver->resume())
1034 * 2.) if ->target and !CPUFREQ_CONST_LOOPS: verify we're in sync 1033 * 2.) if ->target and !CPUFREQ_CONST_LOOPS: verify we're in sync
1035 * 3.) schedule call cpufreq_update_policy() ASAP as interrupts are 1034 * 3.) schedule call cpufreq_update_policy() ASAP as interrupts are
1036 * restored. 1035 * restored.
1037 */ 1036 */
1038 static int cpufreq_resume(struct sys_device * sysdev) 1037 static int cpufreq_resume(struct sys_device * sysdev)
1039 { 1038 {
1040 int cpu = sysdev->id; 1039 int cpu = sysdev->id;
1041 unsigned int ret = 0; 1040 unsigned int ret = 0;
1042 struct cpufreq_policy *cpu_policy; 1041 struct cpufreq_policy *cpu_policy;
1043 1042
1044 dprintk("resuming cpu %u\n", cpu); 1043 dprintk("resuming cpu %u\n", cpu);
1045 1044
1046 if (!cpu_online(cpu)) 1045 if (!cpu_online(cpu))
1047 return 0; 1046 return 0;
1048 1047
1049 /* we may be lax here as interrupts are off. Nonetheless 1048 /* we may be lax here as interrupts are off. Nonetheless
1050 * we need to grab the correct cpu policy, as to check 1049 * we need to grab the correct cpu policy, as to check
1051 * whether we really run on this CPU. 1050 * whether we really run on this CPU.
1052 */ 1051 */
1053 1052
1054 cpu_policy = cpufreq_cpu_get(cpu); 1053 cpu_policy = cpufreq_cpu_get(cpu);
1055 if (!cpu_policy) 1054 if (!cpu_policy)
1056 return -EINVAL; 1055 return -EINVAL;
1057 1056
1058 /* only handle each CPU group once */ 1057 /* only handle each CPU group once */
1059 if (unlikely(cpu_policy->cpu != cpu)) { 1058 if (unlikely(cpu_policy->cpu != cpu)) {
1060 cpufreq_cpu_put(cpu_policy); 1059 cpufreq_cpu_put(cpu_policy);
1061 return 0; 1060 return 0;
1062 } 1061 }
1063 1062
1064 if (cpufreq_driver->resume) { 1063 if (cpufreq_driver->resume) {
1065 ret = cpufreq_driver->resume(cpu_policy); 1064 ret = cpufreq_driver->resume(cpu_policy);
1066 if (ret) { 1065 if (ret) {
1067 printk(KERN_ERR "cpufreq: resume failed in ->resume " 1066 printk(KERN_ERR "cpufreq: resume failed in ->resume "
1068 "step on CPU %u\n", cpu_policy->cpu); 1067 "step on CPU %u\n", cpu_policy->cpu);
1069 cpufreq_cpu_put(cpu_policy); 1068 cpufreq_cpu_put(cpu_policy);
1070 return ret; 1069 return ret;
1071 } 1070 }
1072 } 1071 }
1073 1072
1074 if (!(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) { 1073 if (!(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) {
1075 unsigned int cur_freq = 0; 1074 unsigned int cur_freq = 0;
1076 1075
1077 if (cpufreq_driver->get) 1076 if (cpufreq_driver->get)
1078 cur_freq = cpufreq_driver->get(cpu_policy->cpu); 1077 cur_freq = cpufreq_driver->get(cpu_policy->cpu);
1079 1078
1080 if (!cur_freq || !cpu_policy->cur) { 1079 if (!cur_freq || !cpu_policy->cur) {
1081 printk(KERN_ERR "cpufreq: resume failed to assert " 1080 printk(KERN_ERR "cpufreq: resume failed to assert "
1082 "current frequency is what timing core " 1081 "current frequency is what timing core "
1083 "thinks it is.\n"); 1082 "thinks it is.\n");
1084 goto out; 1083 goto out;
1085 } 1084 }
1086 1085
1087 if (unlikely(cur_freq != cpu_policy->cur)) { 1086 if (unlikely(cur_freq != cpu_policy->cur)) {
1088 struct cpufreq_freqs freqs; 1087 struct cpufreq_freqs freqs;
1089 1088
1090 if (!(cpufreq_driver->flags & CPUFREQ_PM_NO_WARN)) 1089 if (!(cpufreq_driver->flags & CPUFREQ_PM_NO_WARN))
1091 dprintk(KERN_WARNING "Warning: CPU frequency" 1090 dprintk(KERN_WARNING "Warning: CPU frequency"
1092 "is %u, cpufreq assumed %u kHz.\n", 1091 "is %u, cpufreq assumed %u kHz.\n",
1093 cur_freq, cpu_policy->cur); 1092 cur_freq, cpu_policy->cur);
1094 1093
1095 freqs.cpu = cpu; 1094 freqs.cpu = cpu;
1096 freqs.old = cpu_policy->cur; 1095 freqs.old = cpu_policy->cur;
1097 freqs.new = cur_freq; 1096 freqs.new = cur_freq;
1098 1097
1099 blocking_notifier_call_chain( 1098 blocking_notifier_call_chain(
1100 &cpufreq_transition_notifier_list, 1099 &cpufreq_transition_notifier_list,
1101 CPUFREQ_RESUMECHANGE, &freqs); 1100 CPUFREQ_RESUMECHANGE, &freqs);
1102 adjust_jiffies(CPUFREQ_RESUMECHANGE, &freqs); 1101 adjust_jiffies(CPUFREQ_RESUMECHANGE, &freqs);
1103 1102
1104 cpu_policy->cur = cur_freq; 1103 cpu_policy->cur = cur_freq;
1105 } 1104 }
1106 } 1105 }
1107 1106
1108 out: 1107 out:
1109 schedule_work(&cpu_policy->update); 1108 schedule_work(&cpu_policy->update);
1110 cpufreq_cpu_put(cpu_policy); 1109 cpufreq_cpu_put(cpu_policy);
1111 return ret; 1110 return ret;
1112 } 1111 }
1113 1112
1114 static struct sysdev_driver cpufreq_sysdev_driver = { 1113 static struct sysdev_driver cpufreq_sysdev_driver = {
1115 .add = cpufreq_add_dev, 1114 .add = cpufreq_add_dev,
1116 .remove = cpufreq_remove_dev, 1115 .remove = cpufreq_remove_dev,
1117 .suspend = cpufreq_suspend, 1116 .suspend = cpufreq_suspend,
1118 .resume = cpufreq_resume, 1117 .resume = cpufreq_resume,
1119 }; 1118 };
1120 1119
1121 1120
1122 /********************************************************************* 1121 /*********************************************************************
1123 * NOTIFIER LISTS INTERFACE * 1122 * NOTIFIER LISTS INTERFACE *
1124 *********************************************************************/ 1123 *********************************************************************/
1125 1124
1126 /** 1125 /**
1127 * cpufreq_register_notifier - register a driver with cpufreq 1126 * cpufreq_register_notifier - register a driver with cpufreq
1128 * @nb: notifier function to register 1127 * @nb: notifier function to register
1129 * @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER 1128 * @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER
1130 * 1129 *
1131 * Add a driver to one of two lists: either a list of drivers that 1130 * Add a driver to one of two lists: either a list of drivers that
1132 * are notified about clock rate changes (once before and once after 1131 * are notified about clock rate changes (once before and once after
1133 * the transition), or a list of drivers that are notified about 1132 * the transition), or a list of drivers that are notified about
1134 * changes in cpufreq policy. 1133 * changes in cpufreq policy.
1135 * 1134 *
1136 * This function may sleep, and has the same return conditions as 1135 * This function may sleep, and has the same return conditions as
1137 * blocking_notifier_chain_register. 1136 * blocking_notifier_chain_register.
1138 */ 1137 */
1139 int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list) 1138 int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list)
1140 { 1139 {
1141 int ret; 1140 int ret;
1142 1141
1143 switch (list) { 1142 switch (list) {
1144 case CPUFREQ_TRANSITION_NOTIFIER: 1143 case CPUFREQ_TRANSITION_NOTIFIER:
1145 ret = blocking_notifier_chain_register( 1144 ret = blocking_notifier_chain_register(
1146 &cpufreq_transition_notifier_list, nb); 1145 &cpufreq_transition_notifier_list, nb);
1147 break; 1146 break;
1148 case CPUFREQ_POLICY_NOTIFIER: 1147 case CPUFREQ_POLICY_NOTIFIER:
1149 ret = blocking_notifier_chain_register( 1148 ret = blocking_notifier_chain_register(
1150 &cpufreq_policy_notifier_list, nb); 1149 &cpufreq_policy_notifier_list, nb);
1151 break; 1150 break;
1152 default: 1151 default:
1153 ret = -EINVAL; 1152 ret = -EINVAL;
1154 } 1153 }
1155 1154
1156 return ret; 1155 return ret;
1157 } 1156 }
1158 EXPORT_SYMBOL(cpufreq_register_notifier); 1157 EXPORT_SYMBOL(cpufreq_register_notifier);
1159 1158
1160 1159
1161 /** 1160 /**
1162 * cpufreq_unregister_notifier - unregister a driver with cpufreq 1161 * cpufreq_unregister_notifier - unregister a driver with cpufreq
1163 * @nb: notifier block to be unregistered 1162 * @nb: notifier block to be unregistered
1164 * @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER 1163 * @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER
1165 * 1164 *
1166 * Remove a driver from the CPU frequency notifier list. 1165 * Remove a driver from the CPU frequency notifier list.
1167 * 1166 *
1168 * This function may sleep, and has the same return conditions as 1167 * This function may sleep, and has the same return conditions as
1169 * blocking_notifier_chain_unregister. 1168 * blocking_notifier_chain_unregister.
1170 */ 1169 */
1171 int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list) 1170 int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list)
1172 { 1171 {
1173 int ret; 1172 int ret;
1174 1173
1175 switch (list) { 1174 switch (list) {
1176 case CPUFREQ_TRANSITION_NOTIFIER: 1175 case CPUFREQ_TRANSITION_NOTIFIER:
1177 ret = blocking_notifier_chain_unregister( 1176 ret = blocking_notifier_chain_unregister(
1178 &cpufreq_transition_notifier_list, nb); 1177 &cpufreq_transition_notifier_list, nb);
1179 break; 1178 break;
1180 case CPUFREQ_POLICY_NOTIFIER: 1179 case CPUFREQ_POLICY_NOTIFIER:
1181 ret = blocking_notifier_chain_unregister( 1180 ret = blocking_notifier_chain_unregister(
1182 &cpufreq_policy_notifier_list, nb); 1181 &cpufreq_policy_notifier_list, nb);
1183 break; 1182 break;
1184 default: 1183 default:
1185 ret = -EINVAL; 1184 ret = -EINVAL;
1186 } 1185 }
1187 1186
1188 return ret; 1187 return ret;
1189 } 1188 }
1190 EXPORT_SYMBOL(cpufreq_unregister_notifier); 1189 EXPORT_SYMBOL(cpufreq_unregister_notifier);
1191 1190
1192 1191
1193 /********************************************************************* 1192 /*********************************************************************
1194 * GOVERNORS * 1193 * GOVERNORS *
1195 *********************************************************************/ 1194 *********************************************************************/
1196 1195
1197 1196
1198 int __cpufreq_driver_target(struct cpufreq_policy *policy, 1197 int __cpufreq_driver_target(struct cpufreq_policy *policy,
1199 unsigned int target_freq, 1198 unsigned int target_freq,
1200 unsigned int relation) 1199 unsigned int relation)
1201 { 1200 {
1202 int retval = -EINVAL; 1201 int retval = -EINVAL;
1203 1202
1204 lock_cpu_hotplug(); 1203 lock_cpu_hotplug();
1205 dprintk("target for CPU %u: %u kHz, relation %u\n", policy->cpu, 1204 dprintk("target for CPU %u: %u kHz, relation %u\n", policy->cpu,
1206 target_freq, relation); 1205 target_freq, relation);
1207 if (cpu_online(policy->cpu) && cpufreq_driver->target) 1206 if (cpu_online(policy->cpu) && cpufreq_driver->target)
1208 retval = cpufreq_driver->target(policy, target_freq, relation); 1207 retval = cpufreq_driver->target(policy, target_freq, relation);
1209 1208
1210 unlock_cpu_hotplug(); 1209 unlock_cpu_hotplug();
1211 1210
1212 return retval; 1211 return retval;
1213 } 1212 }
1214 EXPORT_SYMBOL_GPL(__cpufreq_driver_target); 1213 EXPORT_SYMBOL_GPL(__cpufreq_driver_target);
1215 1214
1216 int cpufreq_driver_target(struct cpufreq_policy *policy, 1215 int cpufreq_driver_target(struct cpufreq_policy *policy,
1217 unsigned int target_freq, 1216 unsigned int target_freq,
1218 unsigned int relation) 1217 unsigned int relation)
1219 { 1218 {
1220 int ret; 1219 int ret;
1221 1220
1222 policy = cpufreq_cpu_get(policy->cpu); 1221 policy = cpufreq_cpu_get(policy->cpu);
1223 if (!policy) 1222 if (!policy)
1224 return -EINVAL; 1223 return -EINVAL;
1225 1224
1226 mutex_lock(&policy->lock); 1225 mutex_lock(&policy->lock);
1227 1226
1228 ret = __cpufreq_driver_target(policy, target_freq, relation); 1227 ret = __cpufreq_driver_target(policy, target_freq, relation);
1229 1228
1230 mutex_unlock(&policy->lock); 1229 mutex_unlock(&policy->lock);
1231 1230
1232 cpufreq_cpu_put(policy); 1231 cpufreq_cpu_put(policy);
1233 return ret; 1232 return ret;
1234 } 1233 }
1235 EXPORT_SYMBOL_GPL(cpufreq_driver_target); 1234 EXPORT_SYMBOL_GPL(cpufreq_driver_target);
1236 1235
1237 1236
1238 static int __cpufreq_governor(struct cpufreq_policy *policy, unsigned int event) 1237 static int __cpufreq_governor(struct cpufreq_policy *policy, unsigned int event)
1239 { 1238 {
1240 int ret; 1239 int ret;
1241 1240
1242 if (!try_module_get(policy->governor->owner)) 1241 if (!try_module_get(policy->governor->owner))
1243 return -EINVAL; 1242 return -EINVAL;
1244 1243
1245 dprintk("__cpufreq_governor for CPU %u, event %u\n", policy->cpu, event); 1244 dprintk("__cpufreq_governor for CPU %u, event %u\n", policy->cpu, event);
1246 ret = policy->governor->governor(policy, event); 1245 ret = policy->governor->governor(policy, event);
1247 1246
1248 /* we keep one module reference alive for each CPU governed by this CPU */ 1247 /* we keep one module reference alive for each CPU governed by this CPU */
1249 if ((event != CPUFREQ_GOV_START) || ret) 1248 if ((event != CPUFREQ_GOV_START) || ret)
1250 module_put(policy->governor->owner); 1249 module_put(policy->governor->owner);
1251 if ((event == CPUFREQ_GOV_STOP) && !ret) 1250 if ((event == CPUFREQ_GOV_STOP) && !ret)
1252 module_put(policy->governor->owner); 1251 module_put(policy->governor->owner);
1253 1252
1254 return ret; 1253 return ret;
1255 } 1254 }
1256 1255
1257 1256
1258 int cpufreq_governor(unsigned int cpu, unsigned int event) 1257 int cpufreq_governor(unsigned int cpu, unsigned int event)
1259 { 1258 {
1260 int ret = 0; 1259 int ret = 0;
1261 struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); 1260 struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
1262 1261
1263 if (!policy) 1262 if (!policy)
1264 return -EINVAL; 1263 return -EINVAL;
1265 1264
1266 mutex_lock(&policy->lock); 1265 mutex_lock(&policy->lock);
1267 ret = __cpufreq_governor(policy, event); 1266 ret = __cpufreq_governor(policy, event);
1268 mutex_unlock(&policy->lock); 1267 mutex_unlock(&policy->lock);
1269 1268
1270 cpufreq_cpu_put(policy); 1269 cpufreq_cpu_put(policy);
1271 return ret; 1270 return ret;
1272 } 1271 }
1273 EXPORT_SYMBOL_GPL(cpufreq_governor); 1272 EXPORT_SYMBOL_GPL(cpufreq_governor);
1274 1273
1275 1274
1276 int cpufreq_register_governor(struct cpufreq_governor *governor) 1275 int cpufreq_register_governor(struct cpufreq_governor *governor)
1277 { 1276 {
1278 struct cpufreq_governor *t; 1277 struct cpufreq_governor *t;
1279 1278
1280 if (!governor) 1279 if (!governor)
1281 return -EINVAL; 1280 return -EINVAL;
1282 1281
1283 mutex_lock(&cpufreq_governor_mutex); 1282 mutex_lock(&cpufreq_governor_mutex);
1284 1283
1285 list_for_each_entry(t, &cpufreq_governor_list, governor_list) { 1284 list_for_each_entry(t, &cpufreq_governor_list, governor_list) {
1286 if (!strnicmp(governor->name,t->name,CPUFREQ_NAME_LEN)) { 1285 if (!strnicmp(governor->name,t->name,CPUFREQ_NAME_LEN)) {
1287 mutex_unlock(&cpufreq_governor_mutex); 1286 mutex_unlock(&cpufreq_governor_mutex);
1288 return -EBUSY; 1287 return -EBUSY;
1289 } 1288 }
1290 } 1289 }
1291 list_add(&governor->governor_list, &cpufreq_governor_list); 1290 list_add(&governor->governor_list, &cpufreq_governor_list);
1292 1291
1293 mutex_unlock(&cpufreq_governor_mutex); 1292 mutex_unlock(&cpufreq_governor_mutex);
1294 return 0; 1293 return 0;
1295 } 1294 }
1296 EXPORT_SYMBOL_GPL(cpufreq_register_governor); 1295 EXPORT_SYMBOL_GPL(cpufreq_register_governor);
1297 1296
1298 1297
1299 void cpufreq_unregister_governor(struct cpufreq_governor *governor) 1298 void cpufreq_unregister_governor(struct cpufreq_governor *governor)
1300 { 1299 {
1301 if (!governor) 1300 if (!governor)
1302 return; 1301 return;
1303 1302
1304 mutex_lock(&cpufreq_governor_mutex); 1303 mutex_lock(&cpufreq_governor_mutex);
1305 list_del(&governor->governor_list); 1304 list_del(&governor->governor_list);
1306 mutex_unlock(&cpufreq_governor_mutex); 1305 mutex_unlock(&cpufreq_governor_mutex);
1307 return; 1306 return;
1308 } 1307 }
1309 EXPORT_SYMBOL_GPL(cpufreq_unregister_governor); 1308 EXPORT_SYMBOL_GPL(cpufreq_unregister_governor);
1310 1309
1311 1310
1312 1311
1313 /********************************************************************* 1312 /*********************************************************************
1314 * POLICY INTERFACE * 1313 * POLICY INTERFACE *
1315 *********************************************************************/ 1314 *********************************************************************/
1316 1315
1317 /** 1316 /**
1318 * cpufreq_get_policy - get the current cpufreq_policy 1317 * cpufreq_get_policy - get the current cpufreq_policy
1319 * @policy: struct cpufreq_policy into which the current cpufreq_policy is written 1318 * @policy: struct cpufreq_policy into which the current cpufreq_policy is written
1320 * 1319 *
1321 * Reads the current cpufreq policy. 1320 * Reads the current cpufreq policy.
1322 */ 1321 */
1323 int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu) 1322 int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu)
1324 { 1323 {
1325 struct cpufreq_policy *cpu_policy; 1324 struct cpufreq_policy *cpu_policy;
1326 if (!policy) 1325 if (!policy)
1327 return -EINVAL; 1326 return -EINVAL;
1328 1327
1329 cpu_policy = cpufreq_cpu_get(cpu); 1328 cpu_policy = cpufreq_cpu_get(cpu);
1330 if (!cpu_policy) 1329 if (!cpu_policy)
1331 return -EINVAL; 1330 return -EINVAL;
1332 1331
1333 mutex_lock(&cpu_policy->lock); 1332 mutex_lock(&cpu_policy->lock);
1334 memcpy(policy, cpu_policy, sizeof(struct cpufreq_policy)); 1333 memcpy(policy, cpu_policy, sizeof(struct cpufreq_policy));
1335 mutex_unlock(&cpu_policy->lock); 1334 mutex_unlock(&cpu_policy->lock);
1336 1335
1337 cpufreq_cpu_put(cpu_policy); 1336 cpufreq_cpu_put(cpu_policy);
1338 return 0; 1337 return 0;
1339 } 1338 }
1340 EXPORT_SYMBOL(cpufreq_get_policy); 1339 EXPORT_SYMBOL(cpufreq_get_policy);
1341 1340
1342 1341
1343 static int __cpufreq_set_policy(struct cpufreq_policy *data, struct cpufreq_policy *policy) 1342 static int __cpufreq_set_policy(struct cpufreq_policy *data, struct cpufreq_policy *policy)
1344 { 1343 {
1345 int ret = 0; 1344 int ret = 0;
1346 1345
1347 cpufreq_debug_disable_ratelimit(); 1346 cpufreq_debug_disable_ratelimit();
1348 dprintk("setting new policy for CPU %u: %u - %u kHz\n", policy->cpu, 1347 dprintk("setting new policy for CPU %u: %u - %u kHz\n", policy->cpu,
1349 policy->min, policy->max); 1348 policy->min, policy->max);
1350 1349
1351 memcpy(&policy->cpuinfo, &data->cpuinfo, sizeof(struct cpufreq_cpuinfo)); 1350 memcpy(&policy->cpuinfo, &data->cpuinfo, sizeof(struct cpufreq_cpuinfo));
1352 1351
1353 /* verify the cpu speed can be set within this limit */ 1352 /* verify the cpu speed can be set within this limit */
1354 ret = cpufreq_driver->verify(policy); 1353 ret = cpufreq_driver->verify(policy);
1355 if (ret) 1354 if (ret)
1356 goto error_out; 1355 goto error_out;
1357 1356
1358 /* adjust if necessary - all reasons */ 1357 /* adjust if necessary - all reasons */
1359 blocking_notifier_call_chain(&cpufreq_policy_notifier_list, 1358 blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
1360 CPUFREQ_ADJUST, policy); 1359 CPUFREQ_ADJUST, policy);
1361 1360
1362 /* adjust if necessary - hardware incompatibility*/ 1361 /* adjust if necessary - hardware incompatibility*/
1363 blocking_notifier_call_chain(&cpufreq_policy_notifier_list, 1362 blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
1364 CPUFREQ_INCOMPATIBLE, policy); 1363 CPUFREQ_INCOMPATIBLE, policy);
1365 1364
1366 /* verify the cpu speed can be set within this limit, 1365 /* verify the cpu speed can be set within this limit,
1367 which might be different to the first one */ 1366 which might be different to the first one */
1368 ret = cpufreq_driver->verify(policy); 1367 ret = cpufreq_driver->verify(policy);
1369 if (ret) 1368 if (ret)
1370 goto error_out; 1369 goto error_out;
1371 1370
1372 /* notification of the new policy */ 1371 /* notification of the new policy */
1373 blocking_notifier_call_chain(&cpufreq_policy_notifier_list, 1372 blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
1374 CPUFREQ_NOTIFY, policy); 1373 CPUFREQ_NOTIFY, policy);
1375 1374
1376 data->min = policy->min; 1375 data->min = policy->min;
1377 data->max = policy->max; 1376 data->max = policy->max;
1378 1377
1379 dprintk("new min and max freqs are %u - %u kHz\n", data->min, data->max); 1378 dprintk("new min and max freqs are %u - %u kHz\n", data->min, data->max);
1380 1379
1381 if (cpufreq_driver->setpolicy) { 1380 if (cpufreq_driver->setpolicy) {
1382 data->policy = policy->policy; 1381 data->policy = policy->policy;
1383 dprintk("setting range\n"); 1382 dprintk("setting range\n");
1384 ret = cpufreq_driver->setpolicy(policy); 1383 ret = cpufreq_driver->setpolicy(policy);
1385 } else { 1384 } else {
1386 if (policy->governor != data->governor) { 1385 if (policy->governor != data->governor) {
1387 /* save old, working values */ 1386 /* save old, working values */
1388 struct cpufreq_governor *old_gov = data->governor; 1387 struct cpufreq_governor *old_gov = data->governor;
1389 1388
1390 dprintk("governor switch\n"); 1389 dprintk("governor switch\n");
1391 1390
1392 /* end old governor */ 1391 /* end old governor */
1393 if (data->governor) 1392 if (data->governor)
1394 __cpufreq_governor(data, CPUFREQ_GOV_STOP); 1393 __cpufreq_governor(data, CPUFREQ_GOV_STOP);
1395 1394
1396 /* start new governor */ 1395 /* start new governor */
1397 data->governor = policy->governor; 1396 data->governor = policy->governor;
1398 if (__cpufreq_governor(data, CPUFREQ_GOV_START)) { 1397 if (__cpufreq_governor(data, CPUFREQ_GOV_START)) {
1399 /* new governor failed, so re-start old one */ 1398 /* new governor failed, so re-start old one */
1400 dprintk("starting governor %s failed\n", data->governor->name); 1399 dprintk("starting governor %s failed\n", data->governor->name);
1401 if (old_gov) { 1400 if (old_gov) {
1402 data->governor = old_gov; 1401 data->governor = old_gov;
1403 __cpufreq_governor(data, CPUFREQ_GOV_START); 1402 __cpufreq_governor(data, CPUFREQ_GOV_START);
1404 } 1403 }
1405 ret = -EINVAL; 1404 ret = -EINVAL;
1406 goto error_out; 1405 goto error_out;
1407 } 1406 }
1408 /* might be a policy change, too, so fall through */ 1407 /* might be a policy change, too, so fall through */
1409 } 1408 }
1410 dprintk("governor: change or update limits\n"); 1409 dprintk("governor: change or update limits\n");
1411 __cpufreq_governor(data, CPUFREQ_GOV_LIMITS); 1410 __cpufreq_governor(data, CPUFREQ_GOV_LIMITS);
1412 } 1411 }
1413 1412
1414 error_out: 1413 error_out:
1415 cpufreq_debug_enable_ratelimit(); 1414 cpufreq_debug_enable_ratelimit();
1416 return ret; 1415 return ret;
1417 } 1416 }
1418 1417
1419 /** 1418 /**
1420 * cpufreq_set_policy - set a new CPUFreq policy 1419 * cpufreq_set_policy - set a new CPUFreq policy
1421 * @policy: policy to be set. 1420 * @policy: policy to be set.
1422 * 1421 *
1423 * Sets a new CPU frequency and voltage scaling policy. 1422 * Sets a new CPU frequency and voltage scaling policy.
1424 */ 1423 */
1425 int cpufreq_set_policy(struct cpufreq_policy *policy) 1424 int cpufreq_set_policy(struct cpufreq_policy *policy)
1426 { 1425 {
1427 int ret = 0; 1426 int ret = 0;
1428 struct cpufreq_policy *data; 1427 struct cpufreq_policy *data;
1429 1428
1430 if (!policy) 1429 if (!policy)
1431 return -EINVAL; 1430 return -EINVAL;
1432 1431
1433 data = cpufreq_cpu_get(policy->cpu); 1432 data = cpufreq_cpu_get(policy->cpu);
1434 if (!data) 1433 if (!data)
1435 return -EINVAL; 1434 return -EINVAL;
1436 1435
1437 /* lock this CPU */ 1436 /* lock this CPU */
1438 mutex_lock(&data->lock); 1437 mutex_lock(&data->lock);
1439 1438
1440 ret = __cpufreq_set_policy(data, policy); 1439 ret = __cpufreq_set_policy(data, policy);
1441 data->user_policy.min = data->min; 1440 data->user_policy.min = data->min;
1442 data->user_policy.max = data->max; 1441 data->user_policy.max = data->max;
1443 data->user_policy.policy = data->policy; 1442 data->user_policy.policy = data->policy;
1444 data->user_policy.governor = data->governor; 1443 data->user_policy.governor = data->governor;
1445 1444
1446 mutex_unlock(&data->lock); 1445 mutex_unlock(&data->lock);
1447 cpufreq_cpu_put(data); 1446 cpufreq_cpu_put(data);
1448 1447
1449 return ret; 1448 return ret;
1450 } 1449 }
1451 EXPORT_SYMBOL(cpufreq_set_policy); 1450 EXPORT_SYMBOL(cpufreq_set_policy);
1452 1451
1453 1452
1454 /** 1453 /**
1455 * cpufreq_update_policy - re-evaluate an existing cpufreq policy 1454 * cpufreq_update_policy - re-evaluate an existing cpufreq policy
1456 * @cpu: CPU which shall be re-evaluated 1455 * @cpu: CPU which shall be re-evaluated
1457 * 1456 *
1458 * Usefull for policy notifiers which have different necessities 1457 * Usefull for policy notifiers which have different necessities
1459 * at different times. 1458 * at different times.
1460 */ 1459 */
1461 int cpufreq_update_policy(unsigned int cpu) 1460 int cpufreq_update_policy(unsigned int cpu)
1462 { 1461 {
1463 struct cpufreq_policy *data = cpufreq_cpu_get(cpu); 1462 struct cpufreq_policy *data = cpufreq_cpu_get(cpu);
1464 struct cpufreq_policy policy; 1463 struct cpufreq_policy policy;
1465 int ret = 0; 1464 int ret = 0;
1466 1465
1467 if (!data) 1466 if (!data)
1468 return -ENODEV; 1467 return -ENODEV;
1469 1468
1470 mutex_lock(&data->lock); 1469 mutex_lock(&data->lock);
1471 1470
1472 dprintk("updating policy for CPU %u\n", cpu); 1471 dprintk("updating policy for CPU %u\n", cpu);
1473 memcpy(&policy, data, sizeof(struct cpufreq_policy)); 1472 memcpy(&policy, data, sizeof(struct cpufreq_policy));
1474 policy.min = data->user_policy.min; 1473 policy.min = data->user_policy.min;
1475 policy.max = data->user_policy.max; 1474 policy.max = data->user_policy.max;
1476 policy.policy = data->user_policy.policy; 1475 policy.policy = data->user_policy.policy;
1477 policy.governor = data->user_policy.governor; 1476 policy.governor = data->user_policy.governor;
1478 1477
1479 /* BIOS might change freq behind our back 1478 /* BIOS might change freq behind our back
1480 -> ask driver for current freq and notify governors about a change */ 1479 -> ask driver for current freq and notify governors about a change */
1481 if (cpufreq_driver->get) { 1480 if (cpufreq_driver->get) {
1482 policy.cur = cpufreq_driver->get(cpu); 1481 policy.cur = cpufreq_driver->get(cpu);
1483 if (!data->cur) { 1482 if (!data->cur) {
1484 dprintk("Driver did not initialize current freq"); 1483 dprintk("Driver did not initialize current freq");
1485 data->cur = policy.cur; 1484 data->cur = policy.cur;
1486 } else { 1485 } else {
1487 if (data->cur != policy.cur) 1486 if (data->cur != policy.cur)
1488 cpufreq_out_of_sync(cpu, data->cur, policy.cur); 1487 cpufreq_out_of_sync(cpu, data->cur, policy.cur);
1489 } 1488 }
1490 } 1489 }
1491 1490
1492 ret = __cpufreq_set_policy(data, &policy); 1491 ret = __cpufreq_set_policy(data, &policy);
1493 1492
1494 mutex_unlock(&data->lock); 1493 mutex_unlock(&data->lock);
1495 1494
1496 cpufreq_cpu_put(data); 1495 cpufreq_cpu_put(data);
1497 return ret; 1496 return ret;
1498 } 1497 }
1499 EXPORT_SYMBOL(cpufreq_update_policy); 1498 EXPORT_SYMBOL(cpufreq_update_policy);
1500 1499
1501 static int __cpuinit cpufreq_cpu_callback(struct notifier_block *nfb, 1500 static int __cpuinit cpufreq_cpu_callback(struct notifier_block *nfb,
1502 unsigned long action, void *hcpu) 1501 unsigned long action, void *hcpu)
1503 { 1502 {
1504 unsigned int cpu = (unsigned long)hcpu; 1503 unsigned int cpu = (unsigned long)hcpu;
1505 struct cpufreq_policy *policy; 1504 struct cpufreq_policy *policy;
1506 struct sys_device *sys_dev; 1505 struct sys_device *sys_dev;
1507 1506
1508 sys_dev = get_cpu_sysdev(cpu); 1507 sys_dev = get_cpu_sysdev(cpu);
1509 1508
1510 if (sys_dev) { 1509 if (sys_dev) {
1511 switch (action) { 1510 switch (action) {
1512 case CPU_ONLINE: 1511 case CPU_ONLINE:
1513 cpufreq_add_dev(sys_dev); 1512 cpufreq_add_dev(sys_dev);
1514 break; 1513 break;
1515 case CPU_DOWN_PREPARE: 1514 case CPU_DOWN_PREPARE:
1516 /* 1515 /*
1517 * We attempt to put this cpu in lowest frequency 1516 * We attempt to put this cpu in lowest frequency
1518 * possible before going down. This will permit 1517 * possible before going down. This will permit
1519 * hardware-managed P-State to switch other related 1518 * hardware-managed P-State to switch other related
1520 * threads to min or higher speeds if possible. 1519 * threads to min or higher speeds if possible.
1521 */ 1520 */
1522 policy = cpufreq_cpu_data[cpu]; 1521 policy = cpufreq_cpu_data[cpu];
1523 if (policy) { 1522 if (policy) {
1524 cpufreq_driver_target(policy, policy->min, 1523 cpufreq_driver_target(policy, policy->min,
1525 CPUFREQ_RELATION_H); 1524 CPUFREQ_RELATION_H);
1526 } 1525 }
1527 break; 1526 break;
1528 case CPU_DEAD: 1527 case CPU_DEAD:
1529 cpufreq_remove_dev(sys_dev); 1528 cpufreq_remove_dev(sys_dev);
1530 break; 1529 break;
1531 } 1530 }
1532 } 1531 }
1533 return NOTIFY_OK; 1532 return NOTIFY_OK;
1534 } 1533 }
1535 1534
1536 static struct notifier_block cpufreq_cpu_notifier = 1535 static struct notifier_block cpufreq_cpu_notifier =
1537 { 1536 {
1538 .notifier_call = cpufreq_cpu_callback, 1537 .notifier_call = cpufreq_cpu_callback,
1539 }; 1538 };
1540 1539
1541 /********************************************************************* 1540 /*********************************************************************
1542 * REGISTER / UNREGISTER CPUFREQ DRIVER * 1541 * REGISTER / UNREGISTER CPUFREQ DRIVER *
1543 *********************************************************************/ 1542 *********************************************************************/
1544 1543
1545 /** 1544 /**
1546 * cpufreq_register_driver - register a CPU Frequency driver 1545 * cpufreq_register_driver - register a CPU Frequency driver
1547 * @driver_data: A struct cpufreq_driver containing the values# 1546 * @driver_data: A struct cpufreq_driver containing the values#
1548 * submitted by the CPU Frequency driver. 1547 * submitted by the CPU Frequency driver.
1549 * 1548 *
1550 * Registers a CPU Frequency driver to this core code. This code 1549 * Registers a CPU Frequency driver to this core code. This code
1551 * returns zero on success, -EBUSY when another driver got here first 1550 * returns zero on success, -EBUSY when another driver got here first
1552 * (and isn't unregistered in the meantime). 1551 * (and isn't unregistered in the meantime).
1553 * 1552 *
1554 */ 1553 */
1555 int cpufreq_register_driver(struct cpufreq_driver *driver_data) 1554 int cpufreq_register_driver(struct cpufreq_driver *driver_data)
1556 { 1555 {
1557 unsigned long flags; 1556 unsigned long flags;
1558 int ret; 1557 int ret;
1559 1558
1560 if (!driver_data || !driver_data->verify || !driver_data->init || 1559 if (!driver_data || !driver_data->verify || !driver_data->init ||
1561 ((!driver_data->setpolicy) && (!driver_data->target))) 1560 ((!driver_data->setpolicy) && (!driver_data->target)))
1562 return -EINVAL; 1561 return -EINVAL;
1563 1562
1564 dprintk("trying to register driver %s\n", driver_data->name); 1563 dprintk("trying to register driver %s\n", driver_data->name);
1565 1564
1566 if (driver_data->setpolicy) 1565 if (driver_data->setpolicy)
1567 driver_data->flags |= CPUFREQ_CONST_LOOPS; 1566 driver_data->flags |= CPUFREQ_CONST_LOOPS;
1568 1567
1569 spin_lock_irqsave(&cpufreq_driver_lock, flags); 1568 spin_lock_irqsave(&cpufreq_driver_lock, flags);
1570 if (cpufreq_driver) { 1569 if (cpufreq_driver) {
1571 spin_unlock_irqrestore(&cpufreq_driver_lock, flags); 1570 spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
1572 return -EBUSY; 1571 return -EBUSY;
1573 } 1572 }
1574 cpufreq_driver = driver_data; 1573 cpufreq_driver = driver_data;
1575 spin_unlock_irqrestore(&cpufreq_driver_lock, flags); 1574 spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
1576 1575
1577 ret = sysdev_driver_register(&cpu_sysdev_class,&cpufreq_sysdev_driver); 1576 ret = sysdev_driver_register(&cpu_sysdev_class,&cpufreq_sysdev_driver);
1578 1577
1579 if ((!ret) && !(cpufreq_driver->flags & CPUFREQ_STICKY)) { 1578 if ((!ret) && !(cpufreq_driver->flags & CPUFREQ_STICKY)) {
1580 int i; 1579 int i;
1581 ret = -ENODEV; 1580 ret = -ENODEV;
1582 1581
1583 /* check for at least one working CPU */ 1582 /* check for at least one working CPU */
1584 for (i=0; i<NR_CPUS; i++) 1583 for (i=0; i<NR_CPUS; i++)
1585 if (cpufreq_cpu_data[i]) 1584 if (cpufreq_cpu_data[i])
1586 ret = 0; 1585 ret = 0;
1587 1586
1588 /* if all ->init() calls failed, unregister */ 1587 /* if all ->init() calls failed, unregister */
1589 if (ret) { 1588 if (ret) {
1590 dprintk("no CPU initialized for driver %s\n", driver_data->name); 1589 dprintk("no CPU initialized for driver %s\n", driver_data->name);
1591 sysdev_driver_unregister(&cpu_sysdev_class, &cpufreq_sysdev_driver); 1590 sysdev_driver_unregister(&cpu_sysdev_class, &cpufreq_sysdev_driver);
1592 1591
1593 spin_lock_irqsave(&cpufreq_driver_lock, flags); 1592 spin_lock_irqsave(&cpufreq_driver_lock, flags);
1594 cpufreq_driver = NULL; 1593 cpufreq_driver = NULL;
1595 spin_unlock_irqrestore(&cpufreq_driver_lock, flags); 1594 spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
1596 } 1595 }
1597 } 1596 }
1598 1597
1599 if (!ret) { 1598 if (!ret) {
1600 register_cpu_notifier(&cpufreq_cpu_notifier); 1599 register_cpu_notifier(&cpufreq_cpu_notifier);
1601 dprintk("driver %s up and running\n", driver_data->name); 1600 dprintk("driver %s up and running\n", driver_data->name);
1602 cpufreq_debug_enable_ratelimit(); 1601 cpufreq_debug_enable_ratelimit();
1603 } 1602 }
1604 1603
1605 return (ret); 1604 return (ret);
1606 } 1605 }
1607 EXPORT_SYMBOL_GPL(cpufreq_register_driver); 1606 EXPORT_SYMBOL_GPL(cpufreq_register_driver);
1608 1607
1609 1608
1610 /** 1609 /**
1611 * cpufreq_unregister_driver - unregister the current CPUFreq driver 1610 * cpufreq_unregister_driver - unregister the current CPUFreq driver
1612 * 1611 *
1613 * Unregister the current CPUFreq driver. Only call this if you have 1612 * Unregister the current CPUFreq driver. Only call this if you have
1614 * the right to do so, i.e. if you have succeeded in initialising before! 1613 * the right to do so, i.e. if you have succeeded in initialising before!
1615 * Returns zero if successful, and -EINVAL if the cpufreq_driver is 1614 * Returns zero if successful, and -EINVAL if the cpufreq_driver is
1616 * currently not initialised. 1615 * currently not initialised.
1617 */ 1616 */
1618 int cpufreq_unregister_driver(struct cpufreq_driver *driver) 1617 int cpufreq_unregister_driver(struct cpufreq_driver *driver)
1619 { 1618 {
1620 unsigned long flags; 1619 unsigned long flags;
1621 1620
1622 cpufreq_debug_disable_ratelimit(); 1621 cpufreq_debug_disable_ratelimit();
1623 1622
1624 if (!cpufreq_driver || (driver != cpufreq_driver)) { 1623 if (!cpufreq_driver || (driver != cpufreq_driver)) {
1625 cpufreq_debug_enable_ratelimit(); 1624 cpufreq_debug_enable_ratelimit();
1626 return -EINVAL; 1625 return -EINVAL;
1627 } 1626 }
1628 1627
1629 dprintk("unregistering driver %s\n", driver->name); 1628 dprintk("unregistering driver %s\n", driver->name);
1630 1629
1631 sysdev_driver_unregister(&cpu_sysdev_class, &cpufreq_sysdev_driver); 1630 sysdev_driver_unregister(&cpu_sysdev_class, &cpufreq_sysdev_driver);
1632 unregister_cpu_notifier(&cpufreq_cpu_notifier); 1631 unregister_cpu_notifier(&cpufreq_cpu_notifier);
1633 1632
1634 spin_lock_irqsave(&cpufreq_driver_lock, flags); 1633 spin_lock_irqsave(&cpufreq_driver_lock, flags);
1635 cpufreq_driver = NULL; 1634 cpufreq_driver = NULL;
1636 spin_unlock_irqrestore(&cpufreq_driver_lock, flags); 1635 spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
1637 1636
1638 return 0; 1637 return 0;
1639 } 1638 }
1640 EXPORT_SYMBOL_GPL(cpufreq_unregister_driver); 1639 EXPORT_SYMBOL_GPL(cpufreq_unregister_driver);
1641 1640