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/*-
* Copyright (c) 2012 Gleb Smirnoff <glebius@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 AUTHOR 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 AUTHOR 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/systm.h>
#include <sys/counter.h>
#include <sys/kernel.h>
#include <sys/smp.h>
#include <sys/sysctl.h>
#include <vm/uma.h>
static uma_zone_t uint64_pcpu_zone;
void
counter_u64_zero(counter_u64_t c)
{
int i;
for (i = 0; i < mp_ncpus; i++)
*(uint64_t *)((char *)c + sizeof(struct pcpu) * i) = 0;
}
uint64_t
counter_u64_fetch(counter_u64_t c)
{
uint64_t r;
int i;
r = 0;
for (i = 0; i < mp_ncpus; i++)
r += *(uint64_t *)((char *)c + sizeof(struct pcpu) * i);
return (r);
}
counter_u64_t
counter_u64_alloc(int flags)
{
counter_u64_t r;
r = uma_zalloc(uint64_pcpu_zone, flags);
if (r != NULL)
counter_u64_zero(r);
return (r);
}
void
counter_u64_free(counter_u64_t c)
{
uma_zfree(uint64_pcpu_zone, c);
}
int
sysctl_handle_counter_u64(SYSCTL_HANDLER_ARGS)
{
uint64_t out;
int error;
out = counter_u64_fetch(*(counter_u64_t *)arg1);
error = SYSCTL_OUT(req, &out, sizeof(uint64_t));
if (error || !req->newptr)
return (error);
/*
* Any write attempt to a counter zeroes it.
*/
counter_u64_zero(*(counter_u64_t *)arg1);
return (0);
}
static void
counter_startup(void)
{
uint64_pcpu_zone = uma_zcreate("uint64 pcpu", sizeof(uint64_t),
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_PCPU);
}
SYSINIT(counter, SI_SUB_CPU, SI_ORDER_FOURTH, counter_startup, NULL);
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