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Commit 7f53705d authored by Ruchi Kandoi's avatar Ruchi Kandoi
Browse files

cpufreq_stats: Adds the fucntionality to load current values for each frequency 


for all the cores.

The current values for the cpu cores needs to be added to the device
tree for this functionaly to work. It loads the current values for each
frequecy in uA for all the cores.

Change-Id: If03311aaeb3e4c09375dd0beb9ad4fbb254b5c08
Signed-off-by: default avatarRuchi Kandoi <kandoiruchi@google.com>
parent 43eac670

drivers/cpufreq/cpufreq_stats.c

+155 −45
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ 
#include <linux/module.h>

#include <linux/slab.h>

#include <linux/sort.h>

#include <linux/of.h>

#include <linux/cputime.h>



static spinlock_t cpufreq_stats_lock;
@@ -38,6 +39,12 @@ struct all_cpufreq_stats { 
	unsigned int *freq_table;

};



struct cpufreq_power_stats {

	unsigned int state_num;

	unsigned int *curr;

	unsigned int *freq_table;

};



struct all_freq_table {

	unsigned int *freq_table;

	unsigned int table_size;
@@ -47,6 +54,7 @@ static struct all_freq_table *all_freq_table; 


static DEFINE_PER_CPU(struct all_cpufreq_stats *, all_cpufreq_stats);

static DEFINE_PER_CPU(struct cpufreq_stats *, cpufreq_stats_table);

static DEFINE_PER_CPU(struct cpufreq_power_stats *, cpufreq_power_stats);



struct cpufreq_stats_attribute {

	struct attribute attr;
@@ -117,6 +125,29 @@ static int get_index_all_cpufreq_stat(struct all_cpufreq_stats *all_stat, 
	return -1;

}



static ssize_t show_current_in_state(struct kobject *kobj,

		struct kobj_attribute *attr, char *buf)

{

	ssize_t len = 0;

	unsigned int i, cpu;

	struct cpufreq_power_stats *powerstats;



	spin_lock(&cpufreq_stats_lock);

	for_each_possible_cpu(cpu) {

		powerstats = per_cpu(cpufreq_power_stats, cpu);

		if (!powerstats)

			continue;

		len += scnprintf(buf + len, PAGE_SIZE - len, "CPU%d:", cpu);

		for (i = 0; i < powerstats->state_num; i++)

			len += scnprintf(buf + len, PAGE_SIZE - len,

					"%d=%d ", powerstats->freq_table[i],

					powerstats->curr[i]);

		len += scnprintf(buf + len, PAGE_SIZE - len, "\n");

	}

	spin_unlock(&cpufreq_stats_lock);

	return len;

}



static ssize_t show_all_time_in_state(struct kobject *kobj,

		struct kobj_attribute *attr, char *buf)

{
@@ -226,6 +257,9 @@ static struct attribute_group stats_attr_group = { 
static struct kobj_attribute _attr_all_time_in_state = __ATTR(all_time_in_state,

		0444, show_all_time_in_state, NULL);



static struct kobj_attribute _attr_current_in_state = __ATTR(current_in_state,

		0444, show_current_in_state, NULL);



static int freq_table_get_index(struct cpufreq_stats *stat, unsigned int freq)

{

	int index;
@@ -287,17 +321,31 @@ static void cpufreq_allstats_free(void) 
	}

}



static int __cpufreq_stats_create_table(struct cpufreq_policy *policy)

static void cpufreq_powerstats_free(void)

{

	int cpu;

	struct cpufreq_power_stats *powerstats;



	sysfs_remove_file(cpufreq_global_kobject, &_attr_current_in_state.attr);



	for_each_possible_cpu(cpu) {

		powerstats = per_cpu(cpufreq_power_stats, cpu);

		if (!powerstats)

			continue;

		kfree(powerstats->curr);

		kfree(powerstats);

		per_cpu(cpufreq_power_stats, cpu) = NULL;

	}

}



static int __cpufreq_stats_create_table(struct cpufreq_policy *policy,

		struct cpufreq_frequency_table *table, int count)

{

	unsigned int i, count = 0, ret = 0;

	unsigned int i, ret = 0;

	struct cpufreq_stats *stat;

	unsigned int alloc_size;

	unsigned int cpu = policy->cpu;

	struct cpufreq_frequency_table *pos, *table;



	table = cpufreq_frequency_get_table(cpu);

	if (unlikely(!table))

		return 0;

	struct cpufreq_frequency_table *pos;



	if (per_cpu(cpufreq_stats_table, cpu))

		return -EBUSY;
@@ -312,9 +360,6 @@ static int __cpufreq_stats_create_table(struct cpufreq_policy *policy) 
	stat->cpu = cpu;

	per_cpu(cpufreq_stats_table, cpu) = stat;



	cpufreq_for_each_valid_entry(pos, table)

		count++;



	alloc_size = count * sizeof(int) + count * sizeof(u64);



#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
@@ -349,23 +394,6 @@ error_out: 
	return ret;

}



static void cpufreq_stats_create_table(unsigned int cpu)

{

	struct cpufreq_policy *policy;



	/*

	 * "likely(!policy)" because normally cpufreq_stats will be registered

	 * before cpufreq driver

	 */

	policy = cpufreq_cpu_get(cpu);

	if (likely(!policy))

		return;



	__cpufreq_stats_create_table(policy);



	cpufreq_cpu_put(policy);

}



static void cpufreq_stats_update_policy_cpu(struct cpufreq_policy *policy)

{

	struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table,
@@ -379,6 +407,51 @@ static void cpufreq_stats_update_policy_cpu(struct cpufreq_policy *policy) 
	stat->cpu = policy->cpu;

}



static void cpufreq_powerstats_create(unsigned int cpu,

		struct cpufreq_frequency_table *table, int count) {

	unsigned int alloc_size, i = 0, ret = 0;

	struct cpufreq_power_stats *powerstats;

	struct cpufreq_frequency_table *pos;

	struct device_node *cpu_node;

	char device_path[16];



	powerstats = kzalloc(sizeof(struct cpufreq_power_stats),

			GFP_KERNEL);

	if (!powerstats)

		return;



	/* Allocate memory for freq table per cpu as well as clockticks per

	 * freq*/

	alloc_size = count * sizeof(unsigned int) +

		count * sizeof(unsigned int);

	powerstats->curr = kzalloc(alloc_size, GFP_KERNEL);

	if (!powerstats->curr) {

		kfree(powerstats);

		return;

	}

	powerstats->freq_table = powerstats->curr + count;



	spin_lock(&cpufreq_stats_lock);

	i = 0;

	cpufreq_for_each_valid_entry(pos, table)

		powerstats->freq_table[i++] = pos->frequency;

	powerstats->state_num = i;



	snprintf(device_path, sizeof(device_path), "/cpus/cpu@%d", cpu);

	cpu_node = of_find_node_by_path(device_path);

	if (cpu_node) {

		ret = of_property_read_u32_array(cpu_node, "current",

				powerstats->curr, count);

		if (ret) {

			kfree(powerstats->curr);

			kfree(powerstats);

			powerstats = NULL;

		}

	}

	per_cpu(cpufreq_power_stats, cpu) = powerstats;

	spin_unlock(&cpufreq_stats_lock);

}



static int compare_for_sort(const void *lhs_ptr, const void *rhs_ptr)

{

	unsigned int lhs = *(const unsigned int *)(lhs_ptr);
@@ -423,24 +496,14 @@ static void add_all_freq_table(unsigned int freq) 
	all_freq_table->freq_table[all_freq_table->table_size++] = freq;

}



static void cpufreq_allstats_create(unsigned int cpu)

static void cpufreq_allstats_create(unsigned int cpu,

		struct cpufreq_frequency_table *table, int count)

{

	int i , j = 0;

	unsigned int alloc_size, count = 0;

	struct cpufreq_frequency_table *table = cpufreq_frequency_get_table(cpu);

	unsigned int alloc_size;

	struct all_cpufreq_stats *all_stat;

	bool sort_needed = false;



	if (!table)

		return;



	for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {

		unsigned int freq = table[i].frequency;

		if (freq == CPUFREQ_ENTRY_INVALID)

			continue;

		count++;

	}



	all_stat = kzalloc(sizeof(struct all_cpufreq_stats),

			GFP_KERNEL);

	if (!all_stat) {
@@ -479,22 +542,63 @@ static void cpufreq_allstats_create(unsigned int cpu) 
	spin_unlock(&cpufreq_stats_lock);

}



static void cpufreq_stats_create_table(unsigned int cpu)

{

	struct cpufreq_policy *policy;

	struct cpufreq_frequency_table *table, *pos;

	int count = 0;

	/*

	 * "likely(!policy)" because normally cpufreq_stats will be registered

	 * before cpufreq driver

	 */

	policy = cpufreq_cpu_get(cpu);

	if (likely(!policy))

		return;



	table = cpufreq_frequency_get_table(policy->cpu);

	if (likely(table)) {

		cpufreq_for_each_valid_entry(pos, table);

			count++;



		if (!per_cpu(all_cpufreq_stats, cpu))

			cpufreq_allstats_create(cpu, table, count);



		if (!per_cpu(cpufreq_power_stats, cpu))

			cpufreq_powerstats_create(cpu, table, count);



		__cpufreq_stats_create_table(policy, table, count);

	}

	cpufreq_cpu_put(policy);

}



static int cpufreq_stat_notifier_policy(struct notifier_block *nb,

		unsigned long val, void *data)

{

	int ret = 0;

	int ret = 0, count = 0;

	struct cpufreq_policy *policy = data;

	struct cpufreq_frequency_table *table, *pos;

	unsigned int cpu = policy->cpu;



	if (val == CPUFREQ_UPDATE_POLICY_CPU) {

		cpufreq_stats_update_policy_cpu(policy);

		return 0;

	}



	if (!per_cpu(all_cpufreq_stats, policy->cpu))

		cpufreq_allstats_create(policy->cpu);

	table = cpufreq_frequency_get_table(cpu);

	if (!table)

		return 0;



	cpufreq_for_each_valid_entry(pos, table);

		count++;



	if (!per_cpu(all_cpufreq_stats, cpu))

		cpufreq_allstats_create(cpu, table, count);



	if (!per_cpu(cpufreq_power_stats, cpu))

		cpufreq_powerstats_create(cpu, table, count);



	if (val == CPUFREQ_CREATE_POLICY)

		ret = __cpufreq_stats_create_table(policy);

		ret = __cpufreq_stats_create_table(policy, table, count);

	else if (val == CPUFREQ_REMOVE_POLICY)

		__cpufreq_stats_free_table(policy);
@@ -574,7 +678,12 @@ static int __init cpufreq_stats_init(void) 
	ret = sysfs_create_file(cpufreq_global_kobject,

			&_attr_all_time_in_state.attr);

	if (ret)

		pr_warn("Error creating sysfs file for cpufreq stats\n");

		pr_warn("Cannot create sysfs file for cpufreq stats\n");



	ret = sysfs_create_file(cpufreq_global_kobject,

			&_attr_current_in_state.attr);

	if (ret)

		pr_warn("Cannot create sysfs file for cpufreq current stats\n");



	return 0;

}
@@ -589,6 +698,7 @@ static void __exit cpufreq_stats_exit(void) 
	for_each_online_cpu(cpu)

		cpufreq_stats_free_table(cpu);

	cpufreq_allstats_free();

	cpufreq_powerstats_free();

	cpufreq_put_global_kobject();

}