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715f6251 | 1 | /* |
2 | * This file is part of the SPL: Solaris Porting Layer. | |
3 | * | |
4 | * Copyright (c) 2008 Lawrence Livermore National Security, LLC. | |
5 | * Produced at Lawrence Livermore National Laboratory | |
6 | * Written by: | |
7 | * Brian Behlendorf <behlendorf1@llnl.gov>, | |
8 | * Herb Wartens <wartens2@llnl.gov>, | |
9 | * Jim Garlick <garlick@llnl.gov> | |
10 | * UCRL-CODE-235197 | |
11 | * | |
12 | * This is free software; you can redistribute it and/or modify it | |
13 | * under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
16 | * | |
17 | * This is distributed in the hope that it will be useful, but WITHOUT | |
18 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
19 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
20 | * for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License along | |
23 | * with this program; if not, write to the Free Software Foundation, Inc., | |
24 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
25 | */ | |
26 | ||
7c50328b | 27 | #include "splat-internal.h" |
f1ca4da6 | 28 | |
7c50328b | 29 | #define SPLAT_SUBSYSTEM_KRNG 0x0300 |
30 | #define SPLAT_KRNG_NAME "krng" | |
31 | #define SPLAT_KRNG_DESC "Kernel Random Number Generator Tests" | |
f1ca4da6 | 32 | |
7c50328b | 33 | #define SPLAT_KRNG_TEST1_ID 0x0301 |
34 | #define SPLAT_KRNG_TEST1_NAME "freq" | |
35 | #define SPLAT_KRNG_TEST1_DESC "Frequency Test" | |
f1ca4da6 | 36 | |
37 | #define KRNG_NUM_BITS 1048576 | |
38 | #define KRNG_NUM_BYTES (KRNG_NUM_BITS >> 3) | |
39 | #define KRNG_NUM_BITS_DIV2 (KRNG_NUM_BITS >> 1) | |
40 | #define KRNG_ERROR_RANGE 2097 | |
41 | ||
42 | /* Random Number Generator Tests | |
43 | There can be meny more tests on quality of the | |
44 | random number generator. For now we are only | |
45 | testing the frequency of particular bits. | |
46 | We could also test consecutive sequences, | |
47 | randomness within a particular block, etc. | |
48 | but is probably not necessary for our purposes */ | |
49 | ||
50 | static int | |
7c50328b | 51 | splat_krng_test1(struct file *file, void *arg) |
f1ca4da6 | 52 | { |
53 | uint8_t *buf; | |
54 | int i, j, diff, num = 0, rc = 0; | |
55 | ||
56 | buf = kmalloc(sizeof(*buf) * KRNG_NUM_BYTES, GFP_KERNEL); | |
57 | if (buf == NULL) { | |
58 | rc = -ENOMEM; | |
59 | goto out; | |
60 | } | |
61 | ||
62 | memset(buf, 0, sizeof(*buf) * KRNG_NUM_BYTES); | |
63 | ||
64 | /* Always succeeds */ | |
65 | random_get_pseudo_bytes(buf, sizeof(uint8_t) * KRNG_NUM_BYTES); | |
66 | ||
67 | for (i = 0; i < KRNG_NUM_BYTES; i++) { | |
68 | uint8_t tmp = buf[i]; | |
69 | for (j = 0; j < 8; j++) { | |
70 | uint8_t tmp2 = ((tmp >> j) & 0x01); | |
71 | if (tmp2 == 1) { | |
72 | num++; | |
73 | } | |
74 | } | |
75 | } | |
76 | ||
77 | kfree(buf); | |
78 | ||
79 | diff = KRNG_NUM_BITS_DIV2 - num; | |
80 | if (diff < 0) | |
81 | diff *= -1; | |
82 | ||
7c50328b | 83 | splat_print(file, "Test 1 Number of ones: %d\n", num); |
84 | splat_print(file, "Test 1 Difference from expected: %d Allowed: %d\n", | |
f1ca4da6 | 85 | diff, KRNG_ERROR_RANGE); |
86 | ||
87 | if (diff > KRNG_ERROR_RANGE) | |
88 | rc = -ERANGE; | |
89 | out: | |
90 | return rc; | |
91 | } | |
92 | ||
7c50328b | 93 | splat_subsystem_t * |
94 | splat_krng_init(void) | |
f1ca4da6 | 95 | { |
7c50328b | 96 | splat_subsystem_t *sub; |
f1ca4da6 | 97 | |
98 | sub = kmalloc(sizeof(*sub), GFP_KERNEL); | |
99 | if (sub == NULL) | |
100 | return NULL; | |
101 | ||
102 | memset(sub, 0, sizeof(*sub)); | |
7c50328b | 103 | strncpy(sub->desc.name, SPLAT_KRNG_NAME, SPLAT_NAME_SIZE); |
104 | strncpy(sub->desc.desc, SPLAT_KRNG_DESC, SPLAT_DESC_SIZE); | |
f1ca4da6 | 105 | INIT_LIST_HEAD(&sub->subsystem_list); |
106 | INIT_LIST_HEAD(&sub->test_list); | |
107 | spin_lock_init(&sub->test_lock); | |
7c50328b | 108 | sub->desc.id = SPLAT_SUBSYSTEM_KRNG; |
f1ca4da6 | 109 | |
7c50328b | 110 | SPLAT_TEST_INIT(sub, SPLAT_KRNG_TEST1_NAME, SPLAT_KRNG_TEST1_DESC, |
111 | SPLAT_KRNG_TEST1_ID, splat_krng_test1); | |
f1ca4da6 | 112 | |
113 | return sub; | |
114 | } | |
115 | ||
116 | void | |
7c50328b | 117 | splat_krng_fini(splat_subsystem_t *sub) |
f1ca4da6 | 118 | { |
119 | ASSERT(sub); | |
120 | ||
7c50328b | 121 | SPLAT_TEST_FINI(sub, SPLAT_KRNG_TEST1_ID); |
f1ca4da6 | 122 | |
123 | kfree(sub); | |
124 | } | |
125 | ||
126 | int | |
7c50328b | 127 | splat_krng_id(void) { |
128 | return SPLAT_SUBSYSTEM_KRNG; | |
f1ca4da6 | 129 | } |