io/drm/drm_kstat.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2008 Sun Microsystems, Inc.
 * All rights reserved.  Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include "drmP.h"
#include <sys/kstat.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/sunldi.h>

static char *drmkstat_name[] = {
    "opens",
    "closes",
    "IOCTLs",
    "locks",
    "unlocks",
    NULL
};

static int
drm_kstat_update(kstat_t *ksp, int flag)
{
    drm_device_t *sc;
    kstat_named_t *knp;
    int tmp;

    if (flag != KSTAT_READ)
        return (EACCES);

    sc = ksp->ks_private;
    knp = ksp->ks_data;

    for (tmp = 1; tmp < 6; tmp++) {
        (knp++)->value.ui32 = sc->counts[tmp];
    }

    return (0);
}

int
drm_init_kstats(drm_device_t *sc)
{
    int instance;
    kstat_t *ksp;
    kstat_named_t *knp;
    char *np;
    char **aknp;

    instance = ddi_get_instance(sc->dip);
    aknp = drmkstat_name;
    ksp = kstat_create("drm", instance, "drminfo", "drm",
        KSTAT_TYPE_NAMED, sizeof (drmkstat_name)/sizeof (char *) - 1,
        KSTAT_FLAG_PERSISTENT);
    if (ksp == NULL)
        return (NULL);

    ksp->ks_private = sc;
    ksp->ks_update = drm_kstat_update;
    for (knp = ksp->ks_data; (np = (*aknp)) != NULL; knp++, aknp++) {
        kstat_named_init(knp, np, KSTAT_DATA_UINT32);
    }
    kstat_install(ksp);

    sc->asoft_ksp = ksp;

    return (0);
}

void
drm_fini_kstats(drm_device_t *sc)
{
    if (sc->asoft_ksp)
        kstat_delete(sc->asoft_ksp);
    else
        cmn_err(CE_WARN, "attempt to delete null kstat");
}