1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2011 NetApp, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/param.h>
30 #include <sys/kernel.h>
31 #include <sys/systm.h>
32 #include <sys/malloc.h>
33
34 #include <machine/vmm.h>
35
36 #include <dev/vmm/vmm_stat.h>
37
38 /*
39 * 'vst_num_elems' is the total number of addressable statistic elements
40 * 'vst_num_types' is the number of unique statistic types
41 *
42 * It is always true that 'vst_num_elems' is greater than or equal to
43 * 'vst_num_types'. This is because a stat type may represent more than
44 * one element (for e.g. VMM_STAT_ARRAY).
45 */
46 static int vst_num_elems, vst_num_types;
47 static struct vmm_stat_type *vsttab[MAX_VMM_STAT_ELEMS];
48
49 static MALLOC_DEFINE(M_VMM_STAT, "vmm stat", "vmm stat");
50
51 #define vst_size ((size_t)vst_num_elems * sizeof(uint64_t))
52
53 void
vmm_stat_register(void * arg)54 vmm_stat_register(void *arg)
55 {
56 struct vmm_stat_type *vst = arg;
57
58 /* We require all stats to identify themselves with a description */
59 if (vst->desc == NULL)
60 return;
61
62 if (vst->pred != NULL && !vst->pred())
63 return;
64
65 if (vst_num_elems + vst->nelems >= MAX_VMM_STAT_ELEMS) {
66 printf("Cannot accommodate vmm stat type \"%s\"!\n", vst->desc);
67 return;
68 }
69
70 vst->index = vst_num_elems;
71 vst_num_elems += vst->nelems;
72
73 vsttab[vst_num_types++] = vst;
74 }
75
76 int
vmm_stat_copy(struct vcpu * vcpu,int index,int count,int * num_stats,uint64_t * buf)77 vmm_stat_copy(struct vcpu *vcpu, int index, int count, int *num_stats,
78 uint64_t *buf)
79 {
80 struct vmm_stat_type *vst;
81 uint64_t *stats;
82 int i, tocopy;
83
84 if (index < 0 || count < 0)
85 return (EINVAL);
86
87 if (index > vst_num_elems)
88 return (ENOENT);
89
90 if (index == vst_num_elems) {
91 *num_stats = 0;
92 return (0);
93 }
94
95 tocopy = min(vst_num_elems - index, count);
96
97 /* Let stats functions update their counters */
98 for (i = 0; i < vst_num_types; i++) {
99 vst = vsttab[i];
100 if (vst->func != NULL)
101 (*vst->func)(vcpu, vst);
102 }
103
104 /* Copy over the stats */
105 stats = vcpu_stats(vcpu);
106 memcpy(buf, stats + index, tocopy * sizeof(stats[0]));
107 *num_stats = tocopy;
108 return (0);
109 }
110
111 void *
vmm_stat_alloc(void)112 vmm_stat_alloc(void)
113 {
114
115 return (malloc(vst_size, M_VMM_STAT, M_WAITOK));
116 }
117
118 void
vmm_stat_init(void * vp)119 vmm_stat_init(void *vp)
120 {
121
122 bzero(vp, vst_size);
123 }
124
125 void
vmm_stat_free(void * vp)126 vmm_stat_free(void *vp)
127 {
128 free(vp, M_VMM_STAT);
129 }
130
131 int
vmm_stat_desc_copy(int index,char * buf,int bufsize)132 vmm_stat_desc_copy(int index, char *buf, int bufsize)
133 {
134 int i;
135 struct vmm_stat_type *vst;
136
137 for (i = 0; i < vst_num_types; i++) {
138 vst = vsttab[i];
139 if (index >= vst->index && index < vst->index + vst->nelems) {
140 if (vst->nelems > 1) {
141 snprintf(buf, bufsize, "%s[%d]",
142 vst->desc, index - vst->index);
143 } else {
144 strlcpy(buf, vst->desc, bufsize);
145 }
146 return (0); /* found it */
147 }
148 }
149
150 return (EINVAL);
151 }
152