159 lines
4.0 KiB
C
159 lines
4.0 KiB
C
/* $OpenBSD: subr_evcount.c,v 1.16 2023/09/16 09:33:27 mpi Exp $ */
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/*
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* Copyright (c) 2004 Artur Grabowski <art@openbsd.org>
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* Copyright (c) 2004 Aaron Campbell <aaron@openbsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/evcount.h>
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#include <sys/systm.h>
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#include <sys/sysctl.h>
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#include <sys/percpu.h>
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static TAILQ_HEAD(,evcount) evcount_list = TAILQ_HEAD_INITIALIZER(evcount_list);
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static TAILQ_HEAD(,evcount) evcount_percpu_init_list =
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TAILQ_HEAD_INITIALIZER(evcount_percpu_init_list);
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static int evcount_percpu_done;
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void
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evcount_attach(struct evcount *ec, const char *name, void *data)
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{
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static int nextid = 0;
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memset(ec, 0, sizeof(*ec));
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ec->ec_name = name;
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ec->ec_id = ++nextid;
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ec->ec_data = data;
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TAILQ_INSERT_TAIL(&evcount_list, ec, next);
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}
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void
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evcount_percpu(struct evcount *ec)
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{
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if (evcount_percpu_done == 0) {
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TAILQ_REMOVE(&evcount_list, ec, next);
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TAILQ_INSERT_TAIL(&evcount_percpu_init_list, ec, next);
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} else {
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ec->ec_percpu = counters_alloc(1);
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}
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}
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void
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evcount_init_percpu(void)
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{
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struct evcount *ec;
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KASSERT(evcount_percpu_done == 0);
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TAILQ_FOREACH(ec, &evcount_percpu_init_list, next) {
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ec->ec_percpu = counters_alloc(1);
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counters_add(ec->ec_percpu, 0, ec->ec_count);
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ec->ec_count = 0;
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}
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TAILQ_CONCAT(&evcount_list, &evcount_percpu_init_list, next);
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evcount_percpu_done = 1;
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}
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void
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evcount_detach(struct evcount *ec)
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{
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TAILQ_REMOVE(&evcount_list, ec, next);
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if (ec->ec_percpu != NULL) {
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counters_free(ec->ec_percpu, 1);
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ec->ec_percpu = NULL;
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}
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}
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void
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evcount_inc(struct evcount *ec)
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{
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if (ec->ec_percpu != NULL)
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counters_inc(ec->ec_percpu, 0);
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else
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ec->ec_count++;
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}
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#ifndef SMALL_KERNEL
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int
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evcount_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp,
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void *newp, size_t newlen)
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{
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int error = 0, s, nintr, i;
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struct evcount *ec;
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uint64_t count, scratch;
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if (newp != NULL)
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return (EPERM);
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if (name[0] != KERN_INTRCNT_NUM) {
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if (namelen != 2)
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return (ENOTDIR);
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if (name[1] < 0)
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return (EINVAL);
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i = name[1];
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} else
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i = -1;
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nintr = 0;
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TAILQ_FOREACH(ec, &evcount_list, next) {
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if (nintr++ == i)
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break;
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}
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switch (name[0]) {
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case KERN_INTRCNT_NUM:
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error = sysctl_rdint(oldp, oldlenp, NULL, nintr);
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break;
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case KERN_INTRCNT_CNT:
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if (ec == NULL)
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return (ENOENT);
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if (ec->ec_percpu != NULL) {
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counters_read(ec->ec_percpu, &count, 1, &scratch);
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} else {
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s = splhigh();
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count = ec->ec_count;
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splx(s);
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}
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error = sysctl_rdquad(oldp, oldlenp, NULL, count);
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break;
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case KERN_INTRCNT_NAME:
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if (ec == NULL)
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return (ENOENT);
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error = sysctl_rdstring(oldp, oldlenp, NULL, ec->ec_name);
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break;
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case KERN_INTRCNT_VECTOR:
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if (ec == NULL || ec->ec_data == NULL)
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return (ENOENT);
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error = sysctl_rdint(oldp, oldlenp, NULL,
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*((int *)ec->ec_data));
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break;
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default:
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error = EOPNOTSUPP;
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break;
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}
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return (error);
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}
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#endif /* SMALL_KERNEL */
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