module/spl/spl-generic.c

   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
  27 #include <sys/sysmacros.h>
  28 #include <sys/systeminfo.h>
  29 #include <sys/vmsystm.h>
  30 #include <sys/vnode.h>
  31 #include <sys/kmem.h>
  32 #include <sys/mutex.h>
  33 #include <sys/taskq.h>
  34 #include <sys/debug.h>
  35 #include <sys/proc.h>
  36 #include <sys/kstat.h>
  37 #include <sys/utsname.h>
  38 #include <linux/kmod.h>
  39
  40 #ifdef DEBUG_SUBSYSTEM
  41 #undef DEBUG_SUBSYSTEM
  42 #endif
  43
  44 #define DEBUG_SUBSYSTEM S_GENERIC
  45
  46 char spl_version[16] = "SPL v" VERSION;
  47
  48 long spl_hostid = 0;
  49 EXPORT_SYMBOL(spl_hostid);
  50
  51 char hw_serial[HW_HOSTID_LEN] = "<none>";
  52 EXPORT_SYMBOL(hw_serial);
  53
  54 int p0 = 0;
  55 EXPORT_SYMBOL(p0);
  56
  57 int
  58 highbit(unsigned long i)
  59 {
  60         register int h = 1;
  61         ENTRY;
  62
  63         if (i == 0)
  64                 RETURN(0);
  65 #if BITS_PER_LONG == 64
  66         if (i & 0xffffffff00000000ul) {
  67                 h += 32; i >>= 32;
  68         }
  69 #endif
  70         if (i & 0xffff0000) {
  71                 h += 16; i >>= 16;
  72         }
  73         if (i & 0xff00) {
  74                 h += 8; i >>= 8;
  75         }
  76         if (i & 0xf0) {
  77                 h += 4; i >>= 4;
  78         }
  79         if (i & 0xc) {
  80                 h += 2; i >>= 2;
  81         }
  82         if (i & 0x2) {
  83                 h += 1;
  84         }
  85         RETURN(h);
  86 }
  87 EXPORT_SYMBOL(highbit);
  88
  89 /*
  90  * Implementation of 64 bit division for 32-bit machines.
  91  */
  92 #if BITS_PER_LONG == 32
  93 uint64_t __udivdi3(uint64_t dividend, uint64_t divisor)
  94 {
  95 #ifdef HAVE_DIV64_64
  96         return div64_64(dividend, divisor);
  97 #else
  98         /* Taken from a 2.6.24 kernel. */
  99         uint32_t high, d;
 100
 101         high = divisor >> 32;
 102         if (high) {
 103                 unsigned int shift = fls(high);
 104
 105                 d = divisor >> shift;
 106                 dividend >>= shift;
 107         } else
 108                 d = divisor;
 109
 110         do_div(dividend, d);
 111
 112         return dividend;
 113 #endif
 114 }
 115 EXPORT_SYMBOL(__udivdi3);
 116
 117 /*
 118  * Implementation of 64 bit modulo for 32-bit machines.
 119  */
 120 uint64_t __umoddi3(uint64_t dividend, uint64_t divisor)
 121 {
 122         return dividend - divisor * (dividend / divisor);
 123 }
 124 EXPORT_SYMBOL(__umoddi3);
 125 #endif
 126
 127 /* NOTE: The strtoxx behavior is solely based on my reading of the Solaris
 128  * ddi_strtol(9F) man page.  I have not verified the behavior of these
 129  * functions against their Solaris counterparts.  It is possible that I
 130  * may have misinterpretted the man page or the man page is incorrect.
 131  */
 132 int ddi_strtoul(const char *, char **, int, unsigned long *);
 133 int ddi_strtol(const char *, char **, int, long *);
 134 int ddi_strtoull(const char *, char **, int, unsigned long long *);
 135 int ddi_strtoll(const char *, char **, int, long long *);
 136
 137 #define define_ddi_strtoux(type, valtype)                               \
 138 int ddi_strtou##type(const char *str, char **endptr,                    \
 139                      int base, valtype *result)                         \
 140 {                                                                       \
 141         valtype last_value, value = 0;                                  \
 142         char *ptr = (char *)str;                                        \
 143         int flag = 1, digit;                                            \
 144                                                                         \
 145         if (strlen(ptr) == 0)                                           \
 146                 return EINVAL;                                          \
 147                                                                         \
 148         /* Auto-detect base based on prefix */                          \
 149         if (!base) {                                                    \
 150                 if (str[0] == '0') {                                    \
 151                         if (tolower(str[1])=='x' && isxdigit(str[2])) { \
 152                                 base = 16; /* hex */                    \
 153                                 ptr += 2;                               \
 154                         } else if (str[1] >= '0' && str[1] < 8) {       \
 155                                 base = 8; /* octal */                   \
 156                                 ptr += 1;                               \
 157                         } else {                                        \
 158                                 return EINVAL;                          \
 159                         }                                               \
 160                 } else {                                                \
 161                         base = 10; /* decimal */                        \
 162                 }                                                       \
 163         }                                                               \
 164                                                                         \
 165         while (1) {                                                     \
 166                 if (isdigit(*ptr))                                      \
 167                         digit = *ptr - '0';                             \
 168                 else if (isalpha(*ptr))                                 \
 169                         digit = tolower(*ptr) - 'a' + 10;               \
 170                 else                                                    \
 171                         break;                                          \
 172                                                                         \
 173                 if (digit >= base)                                      \
 174                         break;                                          \
 175                                                                         \
 176                 last_value = value;                                     \
 177                 value = value * base + digit;                           \
 178                 if (last_value > value) /* Overflow */                  \
 179                         return ERANGE;                                  \
 180                                                                         \
 181                 flag = 1;                                               \
 182                 ptr++;                                                  \
 183         }                                                               \
 184                                                                         \
 185         if (flag)                                                       \
 186                 *result = value;                                        \
 187                                                                         \
 188         if (endptr)                                                     \
 189                 *endptr = (char *)(flag ? ptr : str);                   \
 190                                                                         \
 191         return 0;                                                       \
 192 }                                                                       \
 193
 194 #define define_ddi_strtox(type, valtype)                                \
 195 int ddi_strto##type(const char *str, char **endptr,                     \
 196                        int base, valtype *result)                       \
 197 {                                                                       \
 198         int rc;                                                         \
 199                                                                         \
 200         if (*str == '-') {                                              \
 201                 rc = ddi_strtou##type(str + 1, endptr, base, result);   \
 202                 if (!rc) {                                              \
 203                         if (*endptr == str + 1)                         \
 204                                 *endptr = (char *)str;                  \
 205                         else                                            \
 206                                 *result = -*result;                     \
 207                 }                                                       \
 208         } else {                                                        \
 209                 rc = ddi_strtou##type(str, endptr, base, result);       \
 210         }                                                               \
 211                                                                         \
 212         return rc;                                                      \
 213 }
 214
 215 define_ddi_strtoux(l, unsigned long)
 216 define_ddi_strtox(l, long)
 217 define_ddi_strtoux(ll, unsigned long long)
 218 define_ddi_strtox(ll, long long)
 219
 220 EXPORT_SYMBOL(ddi_strtoul);
 221 EXPORT_SYMBOL(ddi_strtol);
 222 EXPORT_SYMBOL(ddi_strtoll);
 223 EXPORT_SYMBOL(ddi_strtoull);
 224
 225 struct new_utsname *__utsname(void)
 226 {
 227 #ifdef HAVE_INIT_UTSNAME
 228         return init_utsname();
 229 #else
 230         return &system_utsname;
 231 #endif
 232 }
 233 EXPORT_SYMBOL(__utsname);
 234
 235 static int
 236 set_hostid(void)
 237 {
 238         char sh_path[] = "/bin/sh";
 239         char *argv[] = { sh_path,
 240                          "-c",
 241                          "/usr/bin/hostid >/proc/sys/kernel/spl/hostid",
 242                          NULL };
 243         char *envp[] = { "HOME=/",
 244                          "TERM=linux",
 245                          "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
 246                          NULL };
 247
 248         /* Doing address resolution in the kernel is tricky and just
 249          * not a good idea in general.  So to set the proper 'hw_serial'
 250          * use the usermodehelper support to ask '/bin/sh' to run
 251          * '/usr/bin/hostid' and redirect the result to /proc/sys/spl/hostid
 252          * for us to use.  It's a horific solution but it will do for now.
 253          */
 254         return call_usermodehelper(sh_path, argv, envp, 1);
 255 }
 256
 257 uint32_t
 258 zone_get_hostid(void *zone)
 259 {
 260         unsigned long hostid;
 261
 262         /* Only the global zone is supported */
 263         ASSERT(zone == NULL);
 264
 265         if (ddi_strtoul(hw_serial, NULL, HW_HOSTID_LEN-1, &hostid) != 0)
 266                 return HW_INVALID_HOSTID;
 267
 268         return (uint32_t)hostid;
 269 }
 270 EXPORT_SYMBOL(zone_get_hostid);
 271
 272 static int __init spl_init(void)
 273 {
 274         int rc = 0;
 275
 276         if ((rc = debug_init()))
 277                 return rc;
 278
 279         if ((rc = spl_kmem_init()))
 280                 GOTO(out , rc);
 281
 282         if ((rc = spl_mutex_init()))
 283                 GOTO(out2 , rc);
 284
 285         if ((rc = spl_taskq_init()))
 286                 GOTO(out3, rc);
 287
 288         if ((rc = vn_init()))
 289                 GOTO(out4, rc);
 290
 291         if ((rc = proc_init()))
 292                 GOTO(out5, rc);
 293
 294         if ((rc = kstat_init()))
 295                 GOTO(out6, rc);
 296
 297         if ((rc = set_hostid()))
 298                 GOTO(out7, rc = -EADDRNOTAVAIL);
 299
 300         printk("SPL: Loaded Solaris Porting Layer v%s\n", VERSION);
 301         RETURN(rc);
 302 out7:
 303         kstat_fini();
 304 out6:
 305         proc_fini();
 306 out5:
 307         vn_fini();
 308 out4:
 309         spl_taskq_fini();
 310 out3:
 311         spl_mutex_fini();
 312 out2:
 313         spl_kmem_fini();
 314 out:
 315         debug_fini();
 316
 317         printk("SPL: Failed to Load Solaris Porting Layer v%s, "
 318                "rc = %d\n", VERSION, rc);
 319         return rc;
 320 }
 321
 322 static void spl_fini(void)
 323 {
 324         ENTRY;
 325
 326         printk("SPL: Unloaded Solaris Porting Layer v%s\n", VERSION);
 327         kstat_fini();
 328         proc_fini();
 329         vn_fini();
 330         spl_taskq_fini();
 331         spl_mutex_fini();
 332         spl_kmem_fini();
 333         debug_fini();
 334 }
 335
 336 module_init(spl_init);
 337 module_exit(spl_fini);
 338
 339 MODULE_AUTHOR("Lawrence Livermore National Labs");
 340 MODULE_DESCRIPTION("Solaris Porting Layer");
 341 MODULE_LICENSE("GPL");