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Annotation of sys/kern/subr_evcount.c, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: subr_evcount.c,v 1.8 2006/10/17 10:29:50 grange Exp $ */
                      2: /*
                      3:  * Copyright (c) 2004 Artur Grabowski <art@openbsd.org>
                      4:  * Copyright (c) 2004 Aaron Campbell <aaron@openbsd.org>
                      5:  * All rights reserved.
                      6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  *
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. The name of the author may not be used to endorse or promote products
                     14:  *    derived from this software without specific prior written permission.
                     15:  *
                     16:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
                     17:  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
                     18:  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
                     19:  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
                     20:  * EXEMPLARY, OR CONSEQUENTIAL  DAMAGES (INCLUDING, BUT NOT LIMITED TO,
                     21:  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
                     22:  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
                     23:  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
                     24:  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
                     25:  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     26:  */
                     27:
                     28: #include <sys/param.h>
                     29: #include <sys/evcount.h>
                     30: #include <sys/timeout.h>
                     31: #include <sys/kernel.h>
                     32: #include <sys/systm.h>
                     33: #include <sys/sysctl.h>
                     34:
                     35: static TAILQ_HEAD(,evcount) evcount_list;
                     36:
                     37: /*
                     38:  * Standard evcount parents.
                     39:  */
                     40: struct evcount evcount_intr;
                     41:
                     42: void evcount_init(void);
                     43:
                     44: void
                     45: evcount_init(void)
                     46: {
                     47:        TAILQ_INIT(&evcount_list);
                     48:
                     49:        evcount_attach(&evcount_intr, "intr", NULL, NULL);
                     50: }
                     51:
                     52:
                     53: void
                     54: evcount_attach(struct evcount *ec, const char *name, void *data,
                     55:     struct evcount *parent)
                     56: {
                     57:        static int nextid = 0;
                     58:
                     59:        if (nextid == 0) {
                     60:                nextid++;               /* start with 1 */
                     61:                evcount_init();
                     62:        }
                     63:
                     64:        memset(ec, 0, sizeof(*ec));
                     65:        ec->ec_name = name;
                     66:        ec->ec_parent = parent;
                     67:        ec->ec_id = nextid++;
                     68:        ec->ec_data = data;
                     69:        TAILQ_INSERT_TAIL(&evcount_list, ec, next);
                     70: }
                     71:
                     72: void
                     73: evcount_detach(struct evcount *ec)
                     74: {
                     75:        TAILQ_REMOVE(&evcount_list, ec, next);
                     76: }
                     77:
                     78: #ifndef        SMALL_KERNEL
                     79:
                     80: int
                     81: evcount_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp,
                     82:     void *newp, size_t newlen)
                     83: {
                     84:        int error = 0, s, nintr, i;
                     85:        struct evcount *ec;
                     86:        u_int64_t count;
                     87:
                     88:        if (newp != NULL)
                     89:                return (EPERM);
                     90:
                     91:        if (name[0] != KERN_INTRCNT_NUM) {
                     92:                if (namelen != 2)
                     93:                        return (ENOTDIR);
                     94:                if (name[1] < 0)
                     95:                        return (EINVAL);
                     96:                i = name[1];
                     97:        } else
                     98:                i = -1;
                     99:
                    100:        nintr = 0;
                    101:        TAILQ_FOREACH(ec, &evcount_list, next) {
                    102:                if (ec->ec_parent != &evcount_intr)
                    103:                        continue;
                    104:                if (nintr++ == i)
                    105:                        break;
                    106:        }
                    107:
                    108:        switch (name[0]) {
                    109:        case KERN_INTRCNT_NUM:
                    110:                error = sysctl_rdint(oldp, oldlenp, NULL, nintr);
                    111:                break;
                    112:        case KERN_INTRCNT_CNT:
                    113:                if (ec == NULL)
                    114:                        return (ENOENT);
                    115:                s = splhigh();
                    116:                count = ec->ec_count;
                    117:                splx(s);
                    118:                error = sysctl_rdquad(oldp, oldlenp, NULL, count);
                    119:                break;
                    120:        case KERN_INTRCNT_NAME:
                    121:                if (ec == NULL)
                    122:                        return (ENOENT);
                    123:                error = sysctl_rdstring(oldp, oldlenp, NULL, ec->ec_name);
                    124:                break;
                    125:        case KERN_INTRCNT_VECTOR:
                    126:                if (ec == NULL || ec->ec_data == NULL)
                    127:                        return (ENOENT);
                    128:                error = sysctl_rdint(oldp, oldlenp, NULL,
                    129:                    *((int *)ec->ec_data));
                    130:                break;
                    131:        default:
                    132:                error = EOPNOTSUPP;
                    133:                break;
                    134:        }
                    135:
                    136:        return (error);
                    137: }
                    138: #endif /* SMALL_KERNEL */