usr/src/cmd/mdb/common/modules/random/random.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <sys/mdb_modapi.h>
  30 #include <mdb/mdb_ctf.h>
  31 #include <sys/random.h>
  32
  33 /*
  34  * rnd_stats dcmd - Print out the global rnd_stats structure, nicely formatted.
  35  */
  36 /*ARGSUSED*/
  37 static int
  38 rnd_get_stats(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
  39 {
  40         rnd_stats_t rnd_stats, rnd_stats_cpu;
  41         uint32_t random_max_ncpus;
  42         size_t rndmag_t_size;
  43         ulong_t rndmag_t_offset;
  44         uintptr_t rndmag;
  45         mdb_ctf_id_t rndmag_id;
  46         int i;
  47
  48         if ((flags & DCMD_ADDRSPEC) || argc != 0)
  49                 return (DCMD_USAGE);
  50
  51         if (mdb_readvar(&rnd_stats, "rnd_stats") == -1) {
  52                 mdb_warn("failed to read rnd_stats structure");
  53                 return (DCMD_ERR);
  54         }
  55
  56         if ((mdb_ctf_lookup_by_name("rndmag_t", &rndmag_id) != 0) ||
  57             (mdb_ctf_offsetof(rndmag_id, "rm_stats", &rndmag_t_offset) != 0) ||
  58             (mdb_readvar(&random_max_ncpus, "random_max_ncpus") == -1) ||
  59             (mdb_readvar(&rndmag, "rndmag") == -1) ||
  60             ((rndmag_t_size = mdb_ctf_type_size(rndmag_id)) == 0)) {
  61                 /* Can't find per-cpu stats.  Don't add them in. */
  62                 random_max_ncpus = 0;
  63         }
  64
  65         rndmag_t_offset /= 8;
  66
  67         /*
  68          * Read and aggregate per-cpu stats if we have them.
  69          */
  70         for (i = 0; i < random_max_ncpus; i++) {
  71                 mdb_vread(&rnd_stats_cpu, sizeof (rnd_stats_cpu),
  72                     rndmag + rndmag_t_offset + i * rndmag_t_size);
  73
  74                 rnd_stats.rs_rndOut += rnd_stats_cpu.rs_rndOut;
  75                 rnd_stats.rs_rndcOut += rnd_stats_cpu.rs_rndcOut;
  76                 rnd_stats.rs_urndOut += rnd_stats_cpu.rs_urndOut;
  77         }
  78
  79         mdb_printf("Random number device statistics:\n");
  80
  81         mdb_printf("%8llu bytes generated for /dev/random\n",
  82             rnd_stats.rs_rndOut);
  83         mdb_printf("%8llu bytes read from /dev/random cache\n",
  84             rnd_stats.rs_rndcOut);
  85         mdb_printf("%8llu bytes generated for /dev/urandom\n",
  86             rnd_stats.rs_urndOut);
  87
  88         return (DCMD_OK);
  89 }
  90
  91 /*
  92  * swrand_stats dcmd - Print out the global swrand_stats structure,
  93  * nicely formatted.
  94  */
  95 /*ARGSUSED*/
  96 static int
  97 swrand_get_stats(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
  98 {
  99         swrand_stats_t swrand_stats;
 100
 101         if ((flags & DCMD_ADDRSPEC) || argc != 0)
 102                 return (DCMD_USAGE);
 103
 104         if (mdb_readvar(&swrand_stats, "swrand_stats") == -1) {
 105                 mdb_warn("failed to read swrand_stats structure");
 106                 return (DCMD_ERR);
 107         }
 108
 109         mdb_printf("Software-based Random number generator statistics:\n");
 110
 111         mdb_printf("%8u bits of entropy estimate\n", swrand_stats.ss_entEst);
 112         mdb_printf("%8llu bits of entropy added to the pool\n",
 113             swrand_stats.ss_entIn);
 114         mdb_printf("%8llu bits of entropy extracted from the pool\n",
 115             swrand_stats.ss_entOut);
 116         mdb_printf("%8llu bytes added to the random pool\n",
 117             swrand_stats.ss_bytesIn);
 118         mdb_printf("%8llu bytes extracted from the random pool\n",
 119             swrand_stats.ss_bytesOut);
 120
 121         return (DCMD_OK);
 122 }
 123
 124 static const mdb_dcmd_t dcmds[] = {
 125         { "rnd_stats",
 126             NULL,
 127             "print random number device statistics",
 128             rnd_get_stats },
 129         { "swrand_stats",
 130             NULL,
 131             "print kernel random number provider statistics",
 132             swrand_get_stats },
 133         { NULL }
 134 };
 135
 136 static const mdb_modinfo_t modinfo = {
 137         MDB_API_VERSION, dcmds, NULL
 138 };
 139
 140 const mdb_modinfo_t *
 141 _mdb_init(void)
 142 {
 143         return (&modinfo);
 144 }