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sysfs.c
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sysfs.c
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#include "sysfs.h"
#include "module.h"
#include <linux/sysfs.h>
#define TLB_ATTR_RO(_name) \
struct tlb_sysfs_attr tlb_attr_##_name = \
__ATTR(_name, S_IRUGO, tlb_attr_##_name##_show, NULL)
#define TLB_ATTR_RW(_name) \
struct tlb_sysfs_attr tlb_attr_##_name = \
__ATTR(_name, S_IRUGO | S_IWUSR, tlb_attr_##_name##_show, \
tlb_attr_##_name##_store)
struct tlb_sysfs_attr {
struct attribute attr;
ssize_t (*show)(struct tlb_context *, char *);
ssize_t (*store)(struct tlb_context *, const char *, size_t count);
};
static struct completion *tlb_get_completion_from_kobject(struct kobject *kobj)
{
return &container_of(kobj,
struct tlb_kobject_holder, kobj)->completion;
}
static void tlb_kobject_release(struct kobject *kobj)
{
complete(tlb_get_completion_from_kobject(kobj));
}
static struct tlb_context *tlb_from_kobject(struct kobject *kobj)
{
return container_of(kobj, struct tlb_context, kobj_holder.kobj);
}
int tlb_sysfs_init(struct tlb_kobject_holder *holder, struct kobject *root,
struct kobj_type *ktype, const char *fmt, ...)
{
char name[256];
va_list args;
ktype->release = tlb_kobject_release;
init_completion(&holder->completion);
va_start(args, fmt);
vsnprintf(name, ARRAY_SIZE(name), fmt, args);
va_end(args);
return kobject_init_and_add(&holder->kobj, ktype, root, "%s", name);
}
void tlb_sysfs_deinit(struct tlb_kobject_holder *holder)
{
struct kobject *kobj = &holder->kobj;
if (atomic_cmpxchg(&holder->deiniting, 0, 1) == 0) {
kobject_put(kobj);
wait_for_completion(tlb_get_completion_from_kobject(kobj));
}
}
static ssize_t tlb_attr_start_server_store(struct tlb_context *tlb,
const char *buf, size_t count)
{
char host[64];
int r, port;
r = sscanf(buf, "%63s %d", host, &port);
if (r != 2)
return -EINVAL;
r = tlb_server_start(&tlb->srv, host, port);
if (r)
return r;
return count;
}
static ssize_t tlb_attr_start_server_show(struct tlb_context *tlb,
char *buf)
{
return scnprintf(buf, PAGE_SIZE, "\n");
}
static ssize_t tlb_attr_stop_server_store(struct tlb_context *tlb,
const char *buf, size_t count)
{
int r;
r = tlb_server_stop(&tlb->srv);
if (r)
return r;
return count;
}
static ssize_t tlb_attr_stop_server_show(struct tlb_context *tlb,
char *buf)
{
return scnprintf(buf, PAGE_SIZE, "\n");
}
static ssize_t tlb_attr_add_target_store(struct tlb_context *tlb,
const char *buf, size_t count)
{
char host[64];
int r, port;
r = sscanf(buf, "%63s %d", host, &port);
if (r != 2)
return -EINVAL;
host[63] = '\0';
r = tlb_server_add_target(&tlb->srv, host, port);
if (r)
return r;
return count;
}
static ssize_t tlb_attr_remove_target_store(struct tlb_context *tlb,
const char *buf, size_t count)
{
char host[64];
int r, port;
r = sscanf(buf, "%63s %d", host, &port);
if (r != 2)
return -EINVAL;
host[63] = '\0';
r = tlb_server_remove_target(&tlb->srv, host, port);
if (r)
return r;
return count;
}
static ssize_t tlb_attr_add_target_show(struct tlb_context *tlb,
char *buf)
{
return scnprintf(buf, PAGE_SIZE, "\n");
}
static ssize_t tlb_attr_remove_target_show(struct tlb_context *tlb,
char *buf)
{
return scnprintf(buf, PAGE_SIZE, "\n");
}
static ssize_t tlb_attr_targets_show(struct tlb_context *tlb,
char *buf)
{
struct tlb_server *srv = &tlb->srv;
struct tlb_target *target;
int r, off;
u64 con_time_p50, con_time_p75, con_time_p90, con_time_p99, con_time_p995, con_time_p999;
read_lock(&srv->target_lock);
off = 0;
target = tlb_server_next_target(srv, NULL);
while (target) {
if (off >= PAGE_SIZE)
goto fail_nomem;
con_time_p999 = con_time_p995 = con_time_p99 = con_time_p90 = con_time_p75 = con_time_p50 = 0;
spin_lock(&target->lock);
if (resample_count(&target->con_time_sample) == 1000) {
resample_sort(&target->con_time_sample);
con_time_p50 = resample_get(&target->con_time_sample, 500);
con_time_p75 = resample_get(&target->con_time_sample, 750);
con_time_p90 = resample_get(&target->con_time_sample, 900);
con_time_p99 = resample_get(&target->con_time_sample, 990);
con_time_p995 = resample_get(&target->con_time_sample, 995);
con_time_p999 = resample_get(&target->con_time_sample, 999);
}
spin_unlock(&target->lock);
r = snprintf(buf + off, PAGE_SIZE - off, "%s %d %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu %llu\n",
target->host, target->port, atomic64_read(&target->total_cons), atomic64_read(&target->active_cons),
target->min_con_time_us, target->max_con_time_us,
(atomic64_read(&target->total_cons)) ? target->total_con_time_us / atomic64_read(&target->total_cons) : 0,
con_time_p50, con_time_p75, con_time_p90, con_time_p99, con_time_p995, con_time_p999);
if (r >= (PAGE_SIZE - off))
goto fail_nomem;
off += r;
target = tlb_server_next_target(srv, target);
}
read_unlock(&srv->target_lock);
return off;
fail_nomem:
tlb_target_put(target);
read_unlock(&srv->target_lock);
return -ENOMEM;
}
static ssize_t tlb_attr_show(struct kobject *kobj,
struct attribute *attr,
char *page)
{
struct tlb_sysfs_attr *vattr;
struct tlb_context *tlb;
vattr = container_of(attr, struct tlb_sysfs_attr, attr);
if (!vattr->show)
return -EIO;
tlb = tlb_from_kobject(kobj);
if (!tlb)
return -EIO;
return vattr->show(tlb, page);
}
static ssize_t tlb_attr_store(struct kobject *kobj,
struct attribute *attr,
const char *page, size_t count)
{
struct tlb_sysfs_attr *vattr;
struct tlb_context *tlb;
vattr = container_of(attr, struct tlb_sysfs_attr, attr);
if (!vattr->store)
return -EIO;
tlb = tlb_from_kobject(kobj);
if (!tlb)
return -EIO;
return vattr->store(tlb, page, count);
}
static TLB_ATTR_RW(start_server);
static TLB_ATTR_RW(stop_server);
static TLB_ATTR_RW(add_target);
static TLB_ATTR_RW(remove_target);
static TLB_ATTR_RO(targets);
static struct attribute *tlb_attrs[] = {
&tlb_attr_start_server.attr,
&tlb_attr_stop_server.attr,
&tlb_attr_add_target.attr,
&tlb_attr_remove_target.attr,
&tlb_attr_targets.attr,
NULL,
};
static const struct sysfs_ops tlb_sysfs_ops = {
.show = tlb_attr_show,
.store = tlb_attr_store,
};
struct kobj_type tlb_ktype = {
.sysfs_ops = &tlb_sysfs_ops,
.default_attrs = tlb_attrs,
};