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1da177e4 LT |
1 | /* |
2 | * drivers/cpufreq/cpufreq_stats.c | |
3 | * | |
4 | * Copyright (C) 2003-2004 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>. | |
0a829c5a | 5 | * (C) 2004 Zou Nan hai <nanhai.zou@intel.com>. |
1da177e4 LT |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
1da177e4 | 12 | #include <linux/cpu.h> |
1da177e4 | 13 | #include <linux/cpufreq.h> |
5c720d37 | 14 | #include <linux/module.h> |
5ff0a268 | 15 | #include <linux/slab.h> |
bfc3f028 | 16 | #include <linux/cputime.h> |
1da177e4 | 17 | |
1aefc75b | 18 | static DEFINE_SPINLOCK(cpufreq_stats_lock); |
1da177e4 | 19 | |
1da177e4 | 20 | struct cpufreq_stats { |
1da177e4 | 21 | unsigned int total_trans; |
bb176f7d | 22 | unsigned long long last_time; |
1da177e4 LT |
23 | unsigned int max_state; |
24 | unsigned int state_num; | |
25 | unsigned int last_index; | |
1e7586a1 | 26 | u64 *time_in_state; |
1da177e4 LT |
27 | unsigned int *freq_table; |
28 | #ifdef CONFIG_CPU_FREQ_STAT_DETAILS | |
29 | unsigned int *trans_table; | |
30 | #endif | |
31 | }; | |
32 | ||
50941607 | 33 | static int cpufreq_stats_update(struct cpufreq_stats *stats) |
1da177e4 | 34 | { |
9531347c | 35 | unsigned long long cur_time = get_jiffies_64(); |
58f1df25 | 36 | |
1da177e4 | 37 | spin_lock(&cpufreq_stats_lock); |
c960f9b2 | 38 | stats->time_in_state[stats->last_index] += cur_time - stats->last_time; |
50941607 | 39 | stats->last_time = cur_time; |
1da177e4 LT |
40 | spin_unlock(&cpufreq_stats_lock); |
41 | return 0; | |
42 | } | |
43 | ||
ee7930ee MM |
44 | static void cpufreq_stats_clear_table(struct cpufreq_stats *stats) |
45 | { | |
46 | unsigned int count = stats->max_state; | |
47 | ||
48 | memset(stats->time_in_state, 0, count * sizeof(u64)); | |
49 | #ifdef CONFIG_CPU_FREQ_STAT_DETAILS | |
50 | memset(stats->trans_table, 0, count * count * sizeof(int)); | |
51 | #endif | |
52 | stats->last_time = get_jiffies_64(); | |
53 | stats->total_trans = 0; | |
54 | } | |
55 | ||
0a829c5a | 56 | static ssize_t show_total_trans(struct cpufreq_policy *policy, char *buf) |
1da177e4 | 57 | { |
a9aaf291 | 58 | return sprintf(buf, "%d\n", policy->stats->total_trans); |
1da177e4 LT |
59 | } |
60 | ||
0a829c5a | 61 | static ssize_t show_time_in_state(struct cpufreq_policy *policy, char *buf) |
1da177e4 | 62 | { |
50941607 | 63 | struct cpufreq_stats *stats = policy->stats; |
1da177e4 LT |
64 | ssize_t len = 0; |
65 | int i; | |
a9aaf291 | 66 | |
1aefc75b RW |
67 | if (policy->fast_switch_enabled) |
68 | return 0; | |
69 | ||
50941607 VK |
70 | cpufreq_stats_update(stats); |
71 | for (i = 0; i < stats->state_num; i++) { | |
72 | len += sprintf(buf + len, "%u %llu\n", stats->freq_table[i], | |
0a829c5a | 73 | (unsigned long long) |
50941607 | 74 | jiffies_64_to_clock_t(stats->time_in_state[i])); |
1da177e4 LT |
75 | } |
76 | return len; | |
77 | } | |
78 | ||
ee7930ee MM |
79 | static ssize_t store_reset(struct cpufreq_policy *policy, const char *buf, |
80 | size_t count) | |
81 | { | |
82 | /* We don't care what is written to the attribute. */ | |
83 | cpufreq_stats_clear_table(policy->stats); | |
84 | return count; | |
85 | } | |
86 | ||
1da177e4 | 87 | #ifdef CONFIG_CPU_FREQ_STAT_DETAILS |
0a829c5a | 88 | static ssize_t show_trans_table(struct cpufreq_policy *policy, char *buf) |
1da177e4 | 89 | { |
50941607 | 90 | struct cpufreq_stats *stats = policy->stats; |
1da177e4 LT |
91 | ssize_t len = 0; |
92 | int i, j; | |
93 | ||
1aefc75b RW |
94 | if (policy->fast_switch_enabled) |
95 | return 0; | |
96 | ||
58f1df25 VP |
97 | len += snprintf(buf + len, PAGE_SIZE - len, " From : To\n"); |
98 | len += snprintf(buf + len, PAGE_SIZE - len, " : "); | |
50941607 | 99 | for (i = 0; i < stats->state_num; i++) { |
58f1df25 VP |
100 | if (len >= PAGE_SIZE) |
101 | break; | |
102 | len += snprintf(buf + len, PAGE_SIZE - len, "%9u ", | |
50941607 | 103 | stats->freq_table[i]); |
58f1df25 VP |
104 | } |
105 | if (len >= PAGE_SIZE) | |
25aca347 | 106 | return PAGE_SIZE; |
58f1df25 VP |
107 | |
108 | len += snprintf(buf + len, PAGE_SIZE - len, "\n"); | |
109 | ||
50941607 | 110 | for (i = 0; i < stats->state_num; i++) { |
1da177e4 LT |
111 | if (len >= PAGE_SIZE) |
112 | break; | |
58f1df25 VP |
113 | |
114 | len += snprintf(buf + len, PAGE_SIZE - len, "%9u: ", | |
50941607 | 115 | stats->freq_table[i]); |
1da177e4 | 116 | |
50941607 | 117 | for (j = 0; j < stats->state_num; j++) { |
1da177e4 LT |
118 | if (len >= PAGE_SIZE) |
119 | break; | |
58f1df25 | 120 | len += snprintf(buf + len, PAGE_SIZE - len, "%9u ", |
50941607 | 121 | stats->trans_table[i*stats->max_state+j]); |
1da177e4 | 122 | } |
25aca347 CEB |
123 | if (len >= PAGE_SIZE) |
124 | break; | |
1da177e4 LT |
125 | len += snprintf(buf + len, PAGE_SIZE - len, "\n"); |
126 | } | |
25aca347 CEB |
127 | if (len >= PAGE_SIZE) |
128 | return PAGE_SIZE; | |
1da177e4 LT |
129 | return len; |
130 | } | |
df18e504 | 131 | cpufreq_freq_attr_ro(trans_table); |
1da177e4 LT |
132 | #endif |
133 | ||
df18e504 VK |
134 | cpufreq_freq_attr_ro(total_trans); |
135 | cpufreq_freq_attr_ro(time_in_state); | |
ee7930ee | 136 | cpufreq_freq_attr_wo(reset); |
1da177e4 LT |
137 | |
138 | static struct attribute *default_attrs[] = { | |
df18e504 VK |
139 | &total_trans.attr, |
140 | &time_in_state.attr, | |
ee7930ee | 141 | &reset.attr, |
1da177e4 | 142 | #ifdef CONFIG_CPU_FREQ_STAT_DETAILS |
df18e504 | 143 | &trans_table.attr, |
1da177e4 LT |
144 | #endif |
145 | NULL | |
146 | }; | |
147 | static struct attribute_group stats_attr_group = { | |
148 | .attrs = default_attrs, | |
149 | .name = "stats" | |
150 | }; | |
151 | ||
50941607 | 152 | static int freq_table_get_index(struct cpufreq_stats *stats, unsigned int freq) |
1da177e4 LT |
153 | { |
154 | int index; | |
50941607 VK |
155 | for (index = 0; index < stats->max_state; index++) |
156 | if (stats->freq_table[index] == freq) | |
1da177e4 LT |
157 | return index; |
158 | return -1; | |
159 | } | |
160 | ||
1aefc75b | 161 | void cpufreq_stats_free_table(struct cpufreq_policy *policy) |
1da177e4 | 162 | { |
50941607 | 163 | struct cpufreq_stats *stats = policy->stats; |
b8eed8af | 164 | |
a9aaf291 | 165 | /* Already freed */ |
50941607 | 166 | if (!stats) |
2d13594d VK |
167 | return; |
168 | ||
50941607 | 169 | pr_debug("%s: Free stats table\n", __func__); |
2d13594d VK |
170 | |
171 | sysfs_remove_group(&policy->kobj, &stats_attr_group); | |
50941607 VK |
172 | kfree(stats->time_in_state); |
173 | kfree(stats); | |
a9aaf291 | 174 | policy->stats = NULL; |
98586ed8 | 175 | } |
176 | ||
1aefc75b | 177 | void cpufreq_stats_create_table(struct cpufreq_policy *policy) |
1da177e4 | 178 | { |
a685c6d0 | 179 | unsigned int i = 0, count = 0, ret = -ENOMEM; |
50941607 | 180 | struct cpufreq_stats *stats; |
1da177e4 | 181 | unsigned int alloc_size; |
041526f9 | 182 | struct cpufreq_frequency_table *pos, *table; |
ad4c2302 | 183 | |
a685c6d0 | 184 | /* We need cpufreq table for creating stats table */ |
f8bfc116 | 185 | table = policy->freq_table; |
ad4c2302 | 186 | if (unlikely(!table)) |
1aefc75b | 187 | return; |
ad4c2302 | 188 | |
b8c67448 | 189 | /* stats already initialized */ |
a9aaf291 | 190 | if (policy->stats) |
1aefc75b | 191 | return; |
b8c67448 | 192 | |
50941607 | 193 | stats = kzalloc(sizeof(*stats), GFP_KERNEL); |
a685c6d0 | 194 | if (!stats) |
1aefc75b | 195 | return; |
1da177e4 | 196 | |
a685c6d0 | 197 | /* Find total allocation size */ |
041526f9 | 198 | cpufreq_for_each_valid_entry(pos, table) |
1da177e4 | 199 | count++; |
1da177e4 | 200 | |
1e7586a1 | 201 | alloc_size = count * sizeof(int) + count * sizeof(u64); |
1da177e4 LT |
202 | |
203 | #ifdef CONFIG_CPU_FREQ_STAT_DETAILS | |
204 | alloc_size += count * count * sizeof(int); | |
205 | #endif | |
a685c6d0 VK |
206 | |
207 | /* Allocate memory for time_in_state/freq_table/trans_table in one go */ | |
50941607 | 208 | stats->time_in_state = kzalloc(alloc_size, GFP_KERNEL); |
a685c6d0 VK |
209 | if (!stats->time_in_state) |
210 | goto free_stat; | |
211 | ||
50941607 | 212 | stats->freq_table = (unsigned int *)(stats->time_in_state + count); |
1da177e4 LT |
213 | |
214 | #ifdef CONFIG_CPU_FREQ_STAT_DETAILS | |
50941607 | 215 | stats->trans_table = stats->freq_table + count; |
1da177e4 | 216 | #endif |
a685c6d0 VK |
217 | |
218 | stats->max_state = count; | |
219 | ||
220 | /* Find valid-unique entries */ | |
041526f9 | 221 | cpufreq_for_each_valid_entry(pos, table) |
50941607 VK |
222 | if (freq_table_get_index(stats, pos->frequency) == -1) |
223 | stats->freq_table[i++] = pos->frequency; | |
a685c6d0 | 224 | |
490285c6 | 225 | stats->state_num = i; |
50941607 VK |
226 | stats->last_time = get_jiffies_64(); |
227 | stats->last_index = freq_table_get_index(stats, policy->cur); | |
a685c6d0 VK |
228 | |
229 | policy->stats = stats; | |
230 | ret = sysfs_create_group(&policy->kobj, &stats_attr_group); | |
231 | if (!ret) | |
1aefc75b | 232 | return; |
a685c6d0 VK |
233 | |
234 | /* We failed, release resources */ | |
a9aaf291 | 235 | policy->stats = NULL; |
a685c6d0 VK |
236 | kfree(stats->time_in_state); |
237 | free_stat: | |
238 | kfree(stats); | |
b3f9ff88 VK |
239 | } |
240 | ||
1aefc75b RW |
241 | void cpufreq_stats_record_transition(struct cpufreq_policy *policy, |
242 | unsigned int new_freq) | |
1da177e4 | 243 | { |
1aefc75b | 244 | struct cpufreq_stats *stats = policy->stats; |
1da177e4 LT |
245 | int old_index, new_index; |
246 | ||
1aefc75b | 247 | if (!stats) { |
a9aaf291 | 248 | pr_debug("%s: No stats found\n", __func__); |
1aefc75b | 249 | return; |
a9aaf291 VK |
250 | } |
251 | ||
50941607 | 252 | old_index = stats->last_index; |
1aefc75b | 253 | new_index = freq_table_get_index(stats, new_freq); |
1da177e4 | 254 | |
50941607 | 255 | /* We can't do stats->time_in_state[-1]= .. */ |
1aefc75b RW |
256 | if (old_index == -1 || new_index == -1 || old_index == new_index) |
257 | return; | |
8edc59d9 | 258 | |
e7347694 VK |
259 | cpufreq_stats_update(stats); |
260 | ||
50941607 | 261 | stats->last_index = new_index; |
1da177e4 | 262 | #ifdef CONFIG_CPU_FREQ_STAT_DETAILS |
50941607 | 263 | stats->trans_table[old_index * stats->max_state + new_index]++; |
1da177e4 | 264 | #endif |
50941607 | 265 | stats->total_trans++; |
1da177e4 | 266 | } |