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#include <linux/device.h>
#include <linux/proc_fs.h>
#include <linux/topology.h>
#define MAX_LONG_SIZE 24
struct kobject *cputopo_glb_kobj;
/*
* nr_clusters attribute
*/
static ssize_t nr_clusters_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
return snprintf(buf, MAX_LONG_SIZE, "%u\n", arch_get_nr_clusters());
}
static struct kobj_attribute nr_clusters_attr = __ATTR_RO(nr_clusters);
/*
* is_big_little attribute
*/
static ssize_t is_big_little_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
return snprintf(buf, MAX_LONG_SIZE, "%u\n", arch_is_big_little());
}
static struct kobj_attribute is_big_little_attr = __ATTR_RO(is_big_little);
/*
* is_multi_cluster attribute
*/
static ssize_t is_multi_cluster_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
return snprintf(buf, MAX_LONG_SIZE, "%u\n", arch_is_multi_cluster());
}
static struct kobj_attribute is_multi_cluster_attr = __ATTR_RO(is_multi_cluster);
/*
* little_cpumask attribute
*/
static ssize_t little_cpumask_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
struct cpumask big, little;
arch_get_big_little_cpus(&big, &little);
return snprintf(buf, MAX_LONG_SIZE, "%02lx\n", *cpumask_bits(&little));
}
static struct kobj_attribute little_cpumask_attr = __ATTR_RO(little_cpumask);
/*
* big_cpumask attribute
*/
static ssize_t big_cpumask_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
struct cpumask big, little;
arch_get_big_little_cpus(&big, &little);
return snprintf(buf, MAX_LONG_SIZE, "%02lx\n", *cpumask_bits(&big));
}
static struct kobj_attribute big_cpumask_attr = __ATTR_RO(big_cpumask);
/*
* glbinfo attribute
*/
static ssize_t glbinfo_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
int len = 0;
struct cpumask big, little;
arch_get_big_little_cpus(&big, &little);
len += snprintf(buf + len, PAGE_SIZE - len - 1, "big/little arch: %s\n",
arch_is_big_little() ? "yes" : "no");
len += snprintf(buf + len, PAGE_SIZE - len - 1, "big/little cpumask:%0lx/%0lx\n",
*cpumask_bits(&big), *cpumask_bits(&little));
len += snprintf(buf + len, PAGE_SIZE - len - 1, "nr_cups: %u\n",
nr_cpu_ids);
len += snprintf(buf + len, PAGE_SIZE - len - 1, "nr_clusters: %u\n",
arch_get_nr_clusters());
return len;
}
static struct kobj_attribute glbinfo_attr = __ATTR_RO(glbinfo);
static struct attribute *cputopo_attrs[] = {
&nr_clusters_attr.attr,
&is_big_little_attr.attr,
&is_multi_cluster_attr.attr,
&little_cpumask_attr.attr,
&big_cpumask_attr.attr,
&glbinfo_attr.attr,
NULL,
};
static struct attribute_group cputopo_attr_group = {
.attrs = cputopo_attrs,
};
static int init_cputopo_attribs(void)
{
int err;
/* Create /sys/devices/system/cpu/cputopo/... */
cputopo_glb_kobj = kobject_create_and_add("cputopo", &cpu_subsys.dev_root->kobj);
if (!cputopo_glb_kobj)
return -ENOMEM;
err = sysfs_create_group(cputopo_glb_kobj, &cputopo_attr_group);
if (err)
kobject_put(cputopo_glb_kobj);
return err;
}
static int __init cputopo_info_init(void)
{
int ret = 0;
ret = init_cputopo_attribs();
return ret;
}
core_initcall(cputopo_info_init);
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