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 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 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 * 112 vmm_stat_alloc(void) 113 { 114 115 return (malloc(vst_size, M_VMM_STAT, M_WAITOK)); 116 } 117 118 void 119 vmm_stat_init(void *vp) 120 { 121 122 bzero(vp, vst_size); 123 } 124 125 void 126 vmm_stat_free(void *vp) 127 { 128 free(vp, M_VMM_STAT); 129 } 130 131 int 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