modules/random/random.c

	random.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

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

#include <sys/mdb_modapi.h>
#include <mdb/mdb_ctf.h>
#include <sys/random.h>

/*
 * rnd_stats dcmd - Print out the global rnd_stats structure, nicely formatted.
 */
/*ARGSUSED*/
static int
rnd_get_stats(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
{
    rnd_stats_t rnd_stats, rnd_stats_cpu;
    uint32_t random_max_ncpus;
    size_t rndmag_t_size;
    ulong_t rndmag_t_offset;
    uintptr_t rndmag;
    mdb_ctf_id_t rndmag_id;
    int i;

    if ((flags & DCMD_ADDRSPEC) || argc != 0)
        return (DCMD_USAGE);

    if (mdb_readvar(&rnd_stats, "rnd_stats") == -1) {
        mdb_warn("failed to read rnd_stats structure");
        return (DCMD_ERR);
    }

    if ((mdb_ctf_lookup_by_name("rndmag_t", &rndmag_id) != 0) ||
        (mdb_ctf_offsetof(rndmag_id, "rm_stats", &rndmag_t_offset) != 0) ||
        (mdb_readvar(&random_max_ncpus, "random_max_ncpus") == -1) ||
        (mdb_readvar(&rndmag, "rndmag") == -1) ||
        ((rndmag_t_size = mdb_ctf_type_size(rndmag_id)) == 0)) {
        /* Can't find per-cpu stats.  Don't add them in. */
        random_max_ncpus = 0;
    }

    rndmag_t_offset /= 8;

    /*
     * Read and aggregate per-cpu stats if we have them.
     */
    for (i = 0; i < random_max_ncpus; i++) {
        mdb_vread(&rnd_stats_cpu, sizeof (rnd_stats_cpu),
            rndmag + rndmag_t_offset + i * rndmag_t_size);

        rnd_stats.rs_rndOut += rnd_stats_cpu.rs_rndOut;
        rnd_stats.rs_rndcOut += rnd_stats_cpu.rs_rndcOut;
        rnd_stats.rs_urndOut += rnd_stats_cpu.rs_urndOut;
    }

    mdb_printf("Random number device statistics:\n");

    mdb_printf("%8llu bytes generated for /dev/random\n",
        rnd_stats.rs_rndOut);
    mdb_printf("%8llu bytes read from /dev/random cache\n",
        rnd_stats.rs_rndcOut);
    mdb_printf("%8llu bytes generated for /dev/urandom\n",
        rnd_stats.rs_urndOut);

    return (DCMD_OK);
}

/*
 * swrand_stats dcmd - Print out the global swrand_stats structure,
 * nicely formatted.
 */
/*ARGSUSED*/
static int
swrand_get_stats(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
{
    swrand_stats_t swrand_stats;

    if ((flags & DCMD_ADDRSPEC) || argc != 0)
        return (DCMD_USAGE);

    if (mdb_readvar(&swrand_stats, "swrand_stats") == -1) {
        mdb_warn("failed to read swrand_stats structure");
        return (DCMD_ERR);
    }

    mdb_printf("Software-based Random number generator statistics:\n");

    mdb_printf("%8u bits of entropy estimate\n", swrand_stats.ss_entEst);
    mdb_printf("%8llu bits of entropy added to the pool\n",
        swrand_stats.ss_entIn);
    mdb_printf("%8llu bits of entropy extracted from the pool\n",
        swrand_stats.ss_entOut);
    mdb_printf("%8llu bytes added to the random pool\n",
        swrand_stats.ss_bytesIn);
    mdb_printf("%8llu bytes extracted from the random pool\n",
        swrand_stats.ss_bytesOut);

    return (DCMD_OK);
}

static const mdb_dcmd_t dcmds[] = {
    { "rnd_stats",
        NULL,
        "print random number device statistics",
        rnd_get_stats },
    { "swrand_stats",
        NULL,
        "print kernel random number provider statistics",
        swrand_get_stats },
    { NULL }
};

static const mdb_modinfo_t modinfo = {
    MDB_API_VERSION, dcmds, NULL
};

const mdb_modinfo_t *
_mdb_init(void)
{
    return (&modinfo);
}