drivers/cpufreq/cpufreq_stats.c

30 static void cpufreq_stats_update(struct cpufreq_stats *stats,
35 	stats->time_in_state[stats->last_index] += cur_time - time;
36 	stats->last_time = cur_time;
39 static void cpufreq_stats_reset_table(struct cpufreq_stats *stats)
41 	unsigned int count = stats->max_state;
43 	memset(stats->time_in_state, 0, count * sizeof(u64));
44 	memset(stats->trans_table, 0, count * count * sizeof(int));
45 	stats->last_time = local_clock();
46 	stats->total_trans = 0;
49 	WRITE_ONCE(stats->reset_pending, 0);
55 	cpufreq_stats_update(stats, READ_ONCE(stats->reset_time));
60 	struct cpufreq_stats *stats = policy->stats;
62 	if (READ_ONCE(stats->reset_pending))
65 		return sprintf(buf, "%u\n", stats->total_trans);
71 	struct cpufreq_stats *stats = policy->stats;
72 	bool pending = READ_ONCE(stats->reset_pending);
77 	for (i = 0; i < stats->state_num; i++) {
79 			if (i == stats->last_index) {
85 				time = local_clock() - READ_ONCE(stats->reset_time);
90 			time = stats->time_in_state[i];
91 			if (i == stats->last_index)
92 				time += local_clock() - stats->last_time;
95 		len += sprintf(buf + len, "%u %llu\n", stats->freq_table[i],
106 	struct cpufreq_stats *stats = policy->stats;
109 	 * Defer resetting of stats to cpufreq_stats_record_transition() to
112 	WRITE_ONCE(stats->reset_time, local_clock());
118 	WRITE_ONCE(stats->reset_pending, 1);
126 	struct cpufreq_stats *stats = policy->stats;
127 	bool pending = READ_ONCE(stats->reset_pending);
133 	for (i = 0; i < stats->state_num; i++) {
136 		len += sysfs_emit_at(buf, len, "%9u ", stats->freq_table[i]);
143 	for (i = 0; i < stats->state_num; i++) {
147 		len += sysfs_emit_at(buf, len, "%9u: ", stats->freq_table[i]);
149 		for (j = 0; j < stats->state_num; j++) {
156 				count = stats->trans_table[i * stats->max_state + j];
182 	.name = "stats"
185 static int freq_table_get_index(struct cpufreq_stats *stats, unsigned int freq)
188 	for (index = 0; index < stats->max_state; index++)
189 		if (stats->freq_table[index] == freq)
196 	struct cpufreq_stats *stats = policy->stats;
199 	if (!stats)
202 	pr_debug("%s: Free stats table\n", __func__);
205 	kfree(stats->time_in_state);
206 	kfree(stats);
207 	policy->stats = NULL;
213 	struct cpufreq_stats *stats;
221 	/* stats already initialized */
222 	if (policy->stats)
225 	stats = kzalloc(sizeof(*stats), GFP_KERNEL);
226 	if (!stats)
234 	stats->time_in_state = kzalloc(alloc_size, GFP_KERNEL);
235 	if (!stats->time_in_state)
238 	stats->freq_table = (unsigned int *)(stats->time_in_state + count);
240 	stats->trans_table = stats->freq_table + count;
242 	stats->max_state = count;
247 		    freq_table_get_index(stats, pos->frequency) == -1)
248 			stats->freq_table[i++] = pos->frequency;
250 	stats->state_num = i;
251 	stats->last_time = local_clock();
252 	stats->last_index = freq_table_get_index(stats, policy->cur);
254 	policy->stats = stats;
259 	policy->stats = NULL;
260 	kfree(stats->time_in_state);
262 	kfree(stats);
268 	struct cpufreq_stats *stats = policy->stats;
271 	if (unlikely(!stats))
274 	if (unlikely(READ_ONCE(stats->reset_pending)))
275 		cpufreq_stats_reset_table(stats);
277 	old_index = stats->last_index;
278 	new_index = freq_table_get_index(stats, new_freq);
280 	/* We can't do stats->time_in_state[-1]= .. */
284 	cpufreq_stats_update(stats, stats->last_time);
286 	stats->last_index = new_index;
287 	stats->trans_table[old_index * stats->max_state + new_index]++;
288 	stats->total_trans++;