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/*-
* Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/sysctl.h>
#include <sys/kstat.h>
static MALLOC_DEFINE(M_KSTAT, "kstat_data", "Kernel statistics");
SYSCTL_NODE(, OID_AUTO, kstat, CTLFLAG_RW, 0, "Kernel statistics");
kstat_t *
kstat_create(char *module, int instance, char *name, char *class, uchar_t type,
ulong_t ndata, uchar_t flags)
{
struct sysctl_oid *root;
kstat_t *ksp;
KASSERT(instance == 0, ("instance=%d", instance));
KASSERT(type == KSTAT_TYPE_NAMED, ("type=%hhu", type));
KASSERT(flags == KSTAT_FLAG_VIRTUAL, ("flags=%02hhx", flags));
/*
* Allocate the main structure. We don't need to copy module/class/name
* stuff in here, because it is only used for sysctl node creation
* done in this function.
*/
ksp = malloc(sizeof(*ksp), M_KSTAT, M_WAITOK);
ksp->ks_ndata = ndata;
/*
* Create sysctl tree for those statistics:
*
* kstat.<module>.<class>.<name>.
*/
sysctl_ctx_init(&ksp->ks_sysctl_ctx);
root = SYSCTL_ADD_NODE(&ksp->ks_sysctl_ctx,
SYSCTL_STATIC_CHILDREN(_kstat), OID_AUTO, module, CTLFLAG_RW, 0,
"");
if (root == NULL) {
printf("%s: Cannot create kstat.%s tree!\n", __func__, module);
sysctl_ctx_free(&ksp->ks_sysctl_ctx);
free(ksp, M_KSTAT);
return (NULL);
}
root = SYSCTL_ADD_NODE(&ksp->ks_sysctl_ctx, SYSCTL_CHILDREN(root),
OID_AUTO, class, CTLFLAG_RW, 0, "");
if (root == NULL) {
printf("%s: Cannot create kstat.%s.%s tree!\n", __func__,
module, class);
sysctl_ctx_free(&ksp->ks_sysctl_ctx);
free(ksp, M_KSTAT);
return (NULL);
}
root = SYSCTL_ADD_NODE(&ksp->ks_sysctl_ctx, SYSCTL_CHILDREN(root),
OID_AUTO, name, CTLFLAG_RW, 0, "");
if (root == NULL) {
printf("%s: Cannot create kstat.%s.%s.%s tree!\n", __func__,
module, class, name);
sysctl_ctx_free(&ksp->ks_sysctl_ctx);
free(ksp, M_KSTAT);
return (NULL);
}
ksp->ks_sysctl_root = root;
return (ksp);
}
static int
kstat_sysctl(SYSCTL_HANDLER_ARGS)
{
kstat_named_t *ksent = arg1;
uint64_t val;
val = ksent->value.ui64;
return sysctl_handle_int(oidp, &val, sizeof(val), req);
}
void
kstat_install(kstat_t *ksp)
{
kstat_named_t *ksent;
u_int i;
ksent = ksp->ks_data;
for (i = 0; i < ksp->ks_ndata; i++, ksent++) {
KASSERT(ksent->data_type == KSTAT_DATA_UINT64,
("data_type=%d", ksent->data_type));
SYSCTL_ADD_PROC(&ksp->ks_sysctl_ctx,
SYSCTL_CHILDREN(ksp->ks_sysctl_root), OID_AUTO, ksent->name,
CTLTYPE_QUAD | CTLFLAG_RD, ksent, sizeof(*ksent),
kstat_sysctl, "IU", "");
}
}
void
kstat_delete(kstat_t *ksp)
{
sysctl_ctx_free(&ksp->ks_sysctl_ctx);
free(ksp, M_KSTAT);
}
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