drivers/staging/lustre/lustre/libcfs/libcfs_cpu.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; if not, write to the
  18  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19  * Boston, MA 021110-1307, USA
  20  *
  21  * GPL HEADER END
  22  */
  23 /*
  24  * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
  25  * Copyright (c) 2012, Intel Corporation.
  26  */
  27 /*
  28  * This file is part of Lustre, http://www.lustre.org/
  29  * Lustre is a trademark of Sun Microsystems, Inc.
  30  *
  31  * Please see comments in libcfs/include/libcfs/libcfs_cpu.h for introduction
  32  *
  33  * Author: liang@whamcloud.com
  34  */
  35
  36 #define DEBUG_SUBSYSTEM S_LNET
  37
  38 #include "../../include/linux/libcfs/libcfs.h"
  39
  40 /** Global CPU partition table */
  41 struct cfs_cpt_table   *cfs_cpt_table __read_mostly = NULL;
  42 EXPORT_SYMBOL(cfs_cpt_table);
  43
  44 #ifndef HAVE_LIBCFS_CPT
  45
  46 #define CFS_CPU_VERSION_MAGIC      0xbabecafe
  47
  48 struct cfs_cpt_table *
  49 cfs_cpt_table_alloc(unsigned int ncpt)
  50 {
  51         struct cfs_cpt_table *cptab;
  52
  53         if (ncpt != 1) {
  54                 CERROR("Can't support cpu partition number %d\n", ncpt);
  55                 return NULL;
  56         }
  57
  58         LIBCFS_ALLOC(cptab, sizeof(*cptab));
  59         if (cptab != NULL) {
  60                 cptab->ctb_version = CFS_CPU_VERSION_MAGIC;
  61                 cptab->ctb_nparts  = ncpt;
  62         }
  63
  64         return cptab;
  65 }
  66 EXPORT_SYMBOL(cfs_cpt_table_alloc);
  67
  68 void
  69 cfs_cpt_table_free(struct cfs_cpt_table *cptab)
  70 {
  71         LASSERT(cptab->ctb_version == CFS_CPU_VERSION_MAGIC);
  72
  73         LIBCFS_FREE(cptab, sizeof(*cptab));
  74 }
  75 EXPORT_SYMBOL(cfs_cpt_table_free);
  76
  77 #ifdef CONFIG_SMP
  78 int
  79 cfs_cpt_table_print(struct cfs_cpt_table *cptab, char *buf, int len)
  80 {
  81         int     rc = 0;
  82
  83         rc = snprintf(buf, len, "%d\t: %d\n", 0, 0);
  84         len -= rc;
  85         if (len <= 0)
  86                 return -EFBIG;
  87
  88         return rc;
  89 }
  90 EXPORT_SYMBOL(cfs_cpt_table_print);
  91 #endif /* CONFIG_SMP */
  92
  93 int
  94 cfs_cpt_number(struct cfs_cpt_table *cptab)
  95 {
  96         return 1;
  97 }
  98 EXPORT_SYMBOL(cfs_cpt_number);
  99
 100 int
 101 cfs_cpt_weight(struct cfs_cpt_table *cptab, int cpt)
 102 {
 103         return 1;
 104 }
 105 EXPORT_SYMBOL(cfs_cpt_weight);
 106
 107 int
 108 cfs_cpt_online(struct cfs_cpt_table *cptab, int cpt)
 109 {
 110         return 1;
 111 }
 112 EXPORT_SYMBOL(cfs_cpt_online);
 113
 114 int
 115 cfs_cpt_set_cpu(struct cfs_cpt_table *cptab, int cpt, int cpu)
 116 {
 117         return 1;
 118 }
 119 EXPORT_SYMBOL(cfs_cpt_set_cpu);
 120
 121 void
 122 cfs_cpt_unset_cpu(struct cfs_cpt_table *cptab, int cpt, int cpu)
 123 {
 124 }
 125 EXPORT_SYMBOL(cfs_cpt_unset_cpu);
 126
 127 int
 128 cfs_cpt_set_cpumask(struct cfs_cpt_table *cptab, int cpt, cpumask_t *mask)
 129 {
 130         return 1;
 131 }
 132 EXPORT_SYMBOL(cfs_cpt_set_cpumask);
 133
 134 void
 135 cfs_cpt_unset_cpumask(struct cfs_cpt_table *cptab, int cpt, cpumask_t *mask)
 136 {
 137 }
 138 EXPORT_SYMBOL(cfs_cpt_unset_cpumask);
 139
 140 int
 141 cfs_cpt_set_node(struct cfs_cpt_table *cptab, int cpt, int node)
 142 {
 143         return 1;
 144 }
 145 EXPORT_SYMBOL(cfs_cpt_set_node);
 146
 147 void
 148 cfs_cpt_unset_node(struct cfs_cpt_table *cptab, int cpt, int node)
 149 {
 150 }
 151 EXPORT_SYMBOL(cfs_cpt_unset_node);
 152
 153 int
 154 cfs_cpt_set_nodemask(struct cfs_cpt_table *cptab, int cpt, nodemask_t *mask)
 155 {
 156         return 1;
 157 }
 158 EXPORT_SYMBOL(cfs_cpt_set_nodemask);
 159
 160 void
 161 cfs_cpt_unset_nodemask(struct cfs_cpt_table *cptab, int cpt, nodemask_t *mask)
 162 {
 163 }
 164 EXPORT_SYMBOL(cfs_cpt_unset_nodemask);
 165
 166 void
 167 cfs_cpt_clear(struct cfs_cpt_table *cptab, int cpt)
 168 {
 169 }
 170 EXPORT_SYMBOL(cfs_cpt_clear);
 171
 172 int
 173 cfs_cpt_spread_node(struct cfs_cpt_table *cptab, int cpt)
 174 {
 175         return 0;
 176 }
 177 EXPORT_SYMBOL(cfs_cpt_spread_node);
 178
 179 int
 180 cfs_cpu_ht_nsiblings(int cpu)
 181 {
 182         return 1;
 183 }
 184 EXPORT_SYMBOL(cfs_cpu_ht_nsiblings);
 185
 186 int
 187 cfs_cpt_current(struct cfs_cpt_table *cptab, int remap)
 188 {
 189         return 0;
 190 }
 191 EXPORT_SYMBOL(cfs_cpt_current);
 192
 193 int
 194 cfs_cpt_of_cpu(struct cfs_cpt_table *cptab, int cpu)
 195 {
 196         return 0;
 197 }
 198 EXPORT_SYMBOL(cfs_cpt_of_cpu);
 199
 200 int
 201 cfs_cpt_bind(struct cfs_cpt_table *cptab, int cpt)
 202 {
 203         return 0;
 204 }
 205 EXPORT_SYMBOL(cfs_cpt_bind);
 206
 207 void
 208 cfs_cpu_fini(void)
 209 {
 210         if (cfs_cpt_table != NULL) {
 211                 cfs_cpt_table_free(cfs_cpt_table);
 212                 cfs_cpt_table = NULL;
 213         }
 214 }
 215
 216 int
 217 cfs_cpu_init(void)
 218 {
 219         cfs_cpt_table = cfs_cpt_table_alloc(1);
 220
 221         return cfs_cpt_table != NULL ? 0 : -1;
 222 }
 223
 224 #endif /* HAVE_LIBCFS_CPT */