/*
 * 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 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

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

#include <sys/types.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/systm.h>
#include <sys/kstat.h>
#include <sys/crypto/common.h>
#include <sys/crypto/spi.h>
#include <sys/n2rng.h>

/*
 * Kernel statistics.
 */
static int n2rng_ksupdate(kstat_t *, int);

/*
 * Initialize Kstats.
 */
void
n2rng_ksinit(n2rng_t *n2rng)
{
        int     instance;
        int     i;
        int     j;
        char    buf[64];

        if (ddi_getprop(DDI_DEV_T_ANY, n2rng->n_dip,
            DDI_PROP_CANSLEEP | DDI_PROP_DONTPASS, "nostats", 0) != 0) {
                /*
                 * sysadmin has explicity disabled stats to prevent
                 * covert channel.
                 */
                return;
        }

        instance = ddi_get_instance(n2rng->n_dip);

        /*
         * Named kstats.
         */
        n2rng->n_ksp = kstat_create(DRIVER, instance, NULL, "misc",
            KSTAT_TYPE_NAMED,
            sizeof (n2rng_stat_t) / sizeof (kstat_named_t),
            KSTAT_FLAG_WRITABLE);
        if (n2rng->n_ksp == NULL) {
                n2rng_error(n2rng, "unable to create kstats");
        } else {
                n2rng_stat_t *dkp = (n2rng_stat_t *)n2rng->n_ksp->ks_data;

                kstat_named_init(&dkp->ns_status, "status", KSTAT_DATA_CHAR);

                kstat_named_init(&dkp->ns_algs[DS_RNGJOBS], "rngjobs",
                    KSTAT_DATA_ULONGLONG);
                kstat_named_init(&dkp->ns_algs[DS_RNGBYTES], "rngbytes",
                    KSTAT_DATA_ULONGLONG);

                if (n2rng_iscontrol(n2rng)) {

                        for (i = 0; i < n2rng->n_ctl_data->n_num_rngs; i++) {
                                (void) sprintf(buf, "rng%d-state", i);
                                kstat_named_init(&dkp->ns_rngstate[i],
                                    buf, KSTAT_DATA_CHAR);
                                for (j = 0; j < N2RNG_NOSC; j++) {
                                        (void) sprintf(buf,
                                            "rng%d-cell%d-bias", i, j);
                                        kstat_named_init
                                            (&dkp->ns_rngbias[i][j],
                                            buf, KSTAT_DATA_ULONGLONG);
                                        (void) sprintf(buf,
                                            "rng%d-cell%d-entropy", i, j);
                                        kstat_named_init
                                            (&dkp->ns_rngentropy[i][j],
                                            buf, KSTAT_DATA_ULONGLONG);
                                }
                        }
                }
                n2rng->n_ksp->ks_update = n2rng_ksupdate;
                n2rng->n_ksp->ks_private = n2rng;

                kstat_install(n2rng->n_ksp);
        }
}

/*
 * Deinitialize Kstats.
 */
void
n2rng_ksdeinit(n2rng_t *n2rng)
{

        if (n2rng->n_ksp != NULL) {
                kstat_delete(n2rng->n_ksp);
                n2rng->n_ksp = NULL;
        }
}

/*
 * Update Kstats.
 */
int
n2rng_ksupdate(kstat_t *ksp, int rw)
{
        n2rng_t         *n2rng;
        n2rng_stat_t    *dkp;
        int             i;
        int             j;

        n2rng = (n2rng_t *)ksp->ks_private;
        dkp = (n2rng_stat_t *)ksp->ks_data;

        if (rw == KSTAT_WRITE) {
                for (i = 0; i < DS_MAX; i++) {
                        n2rng->n_stats[i] = dkp->ns_algs[i].value.ull;
                }
        } else {
                /* handy status value */
                if (n2rng_isfailed(n2rng)) {
                        /* device has failed */
                        (void) strcpy(dkp->ns_status.value.c, "failed");
                } else if (!n2rng_isconfigured(n2rng)) {
                        /* device is not configured */
                        (void) strcpy(dkp->ns_status.value.c, "offline");
                } else {
                        /* everything looks good */
                        (void) strcpy(dkp->ns_status.value.c, "online");
                }

                for (i = 0; i < DS_MAX; i++) {
                        dkp->ns_algs[i].value.ull = n2rng->n_stats[i];
                }

                if (n2rng_iscontrol(n2rng)) {
                        rng_entry_t *rng;

                        for (i = 0; i < n2rng->n_ctl_data->n_num_rngs; i++) {

                                rng = &n2rng->n_ctl_data->n_rngs[i];

                                switch (rng->n_rng_state) {
                                case CTL_STATE_ERROR:
                                        (void) strcpy(
                                            dkp->ns_rngstate[i].value.c,
                                            "error");
                                        break;
                                case CTL_STATE_HEALTHCHECK:
                                        (void) strcpy(
                                            dkp->ns_rngstate[i].value.c,
                                            "healthcheck");
                                        break;
                                case CTL_STATE_CONFIGURED:
                                        (void) strcpy(
                                            dkp->ns_rngstate[i].value.c,
                                            "online");
                                        break;
                                case CTL_STATE_UNCONFIGURED:
                                        (void) strcpy(
                                            dkp->ns_rngstate[i].value.c,
                                            "offline");
                                        break;
                                default:
                                        (void) strcpy(
                                            dkp->ns_rngstate[i].value.c,
                                            "unknown");
                                        break;
                                }
                                for (j = 0; j < N2RNG_NOSC; j++) {
                                        dkp->ns_rngbias[i][j].value.ull =
                                            rng->n_bias_info[j].bias;
                                        dkp->ns_rngentropy[i][j].value.ull =
                                            rng->n_bias_info[j].entropy;
                                }
                        }
                }
        }

        return (0);
}