468 lines
11 KiB
C
468 lines
11 KiB
C
/*
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* This file is part of the SPL: Solaris Porting Layer.
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*
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* Copyright (c) 2008 Lawrence Livermore National Security, LLC.
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* Produced at Lawrence Livermore National Laboratory
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* Written by:
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* Brian Behlendorf <behlendorf1@llnl.gov>,
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* Herb Wartens <wartens2@llnl.gov>,
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* Jim Garlick <garlick@llnl.gov>
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* UCRL-CODE-235197
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*
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* This is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <sys/sysmacros.h>
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#include <sys/systeminfo.h>
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#include <sys/vmsystm.h>
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#include <sys/vnode.h>
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#include <sys/kmem.h>
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#include <sys/mutex.h>
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#include <sys/rwlock.h>
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#include <sys/taskq.h>
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#include <sys/debug.h>
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#include <sys/proc.h>
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#include <sys/kstat.h>
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#include <sys/utsname.h>
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#include <sys/file.h>
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#include <linux/kmod.h>
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#include "spl_config.h"
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#ifdef DEBUG_SUBSYSTEM
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#undef DEBUG_SUBSYSTEM
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#endif
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#define DEBUG_SUBSYSTEM S_GENERIC
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char spl_version[16] = "SPL v" SPL_META_VERSION;
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long spl_hostid = 0;
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EXPORT_SYMBOL(spl_hostid);
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char hw_serial[HW_HOSTID_LEN] = "<none>";
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EXPORT_SYMBOL(hw_serial);
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int p0 = 0;
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EXPORT_SYMBOL(p0);
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#ifndef HAVE_KALLSYMS_LOOKUP_NAME
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kallsyms_lookup_name_t spl_kallsyms_lookup_name_fn = SYMBOL_POISON;
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#endif
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int
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highbit(unsigned long i)
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{
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register int h = 1;
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ENTRY;
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if (i == 0)
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RETURN(0);
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#if BITS_PER_LONG == 64
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if (i & 0xffffffff00000000ul) {
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h += 32; i >>= 32;
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}
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#endif
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if (i & 0xffff0000) {
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h += 16; i >>= 16;
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}
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if (i & 0xff00) {
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h += 8; i >>= 8;
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}
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if (i & 0xf0) {
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h += 4; i >>= 4;
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}
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if (i & 0xc) {
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h += 2; i >>= 2;
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}
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if (i & 0x2) {
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h += 1;
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}
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RETURN(h);
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}
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EXPORT_SYMBOL(highbit);
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/*
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* Implementation of 64 bit division for 32-bit machines.
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*/
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#if BITS_PER_LONG == 32
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uint64_t __udivdi3(uint64_t dividend, uint64_t divisor)
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{
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#if defined(HAVE_DIV64_64) /* 2.6.22 - 2.6.25 API */
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return div64_64(dividend, divisor);
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#elif defined(HAVE_DIV64_U64) /* 2.6.26 - 2.6.x API */
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return div64_u64(dividend, divisor);
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#else
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/* Implementation from 2.6.30 kernel */
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uint32_t high, d;
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high = divisor >> 32;
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if (high) {
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unsigned int shift = fls(high);
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d = divisor >> shift;
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dividend >>= shift;
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} else
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d = divisor;
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return do_div(dividend, d);
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#endif /* HAVE_DIV64_64, HAVE_DIV64_U64 */
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}
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EXPORT_SYMBOL(__udivdi3);
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/*
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* Implementation of 64 bit modulo for 32-bit machines.
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*/
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uint64_t __umoddi3(uint64_t dividend, uint64_t divisor)
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{
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return dividend - divisor * (dividend / divisor);
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}
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EXPORT_SYMBOL(__umoddi3);
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#endif /* BITS_PER_LONG */
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/* NOTE: The strtoxx behavior is solely based on my reading of the Solaris
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* ddi_strtol(9F) man page. I have not verified the behavior of these
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* functions against their Solaris counterparts. It is possible that I
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* may have misinterpreted the man page or the man page is incorrect.
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*/
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int ddi_strtoul(const char *, char **, int, unsigned long *);
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int ddi_strtol(const char *, char **, int, long *);
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int ddi_strtoull(const char *, char **, int, unsigned long long *);
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int ddi_strtoll(const char *, char **, int, long long *);
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#define define_ddi_strtoux(type, valtype) \
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int ddi_strtou##type(const char *str, char **endptr, \
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int base, valtype *result) \
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{ \
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valtype last_value, value = 0; \
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char *ptr = (char *)str; \
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int flag = 1, digit; \
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\
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if (strlen(ptr) == 0) \
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return EINVAL; \
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\
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/* Auto-detect base based on prefix */ \
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if (!base) { \
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if (str[0] == '0') { \
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if (tolower(str[1])=='x' && isxdigit(str[2])) { \
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base = 16; /* hex */ \
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ptr += 2; \
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} else if (str[1] >= '0' && str[1] < 8) { \
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base = 8; /* octal */ \
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ptr += 1; \
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} else { \
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return EINVAL; \
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} \
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} else { \
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base = 10; /* decimal */ \
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} \
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} \
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\
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while (1) { \
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if (isdigit(*ptr)) \
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digit = *ptr - '0'; \
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else if (isalpha(*ptr)) \
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digit = tolower(*ptr) - 'a' + 10; \
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else \
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break; \
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\
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if (digit >= base) \
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break; \
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\
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last_value = value; \
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value = value * base + digit; \
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if (last_value > value) /* Overflow */ \
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return ERANGE; \
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\
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flag = 1; \
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ptr++; \
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} \
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\
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if (flag) \
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*result = value; \
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\
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if (endptr) \
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*endptr = (char *)(flag ? ptr : str); \
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\
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return 0; \
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} \
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#define define_ddi_strtox(type, valtype) \
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int ddi_strto##type(const char *str, char **endptr, \
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int base, valtype *result) \
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{ \
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int rc; \
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\
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if (*str == '-') { \
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rc = ddi_strtou##type(str + 1, endptr, base, result); \
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if (!rc) { \
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if (*endptr == str + 1) \
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*endptr = (char *)str; \
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else \
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*result = -*result; \
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} \
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} else { \
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rc = ddi_strtou##type(str, endptr, base, result); \
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} \
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\
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return rc; \
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}
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define_ddi_strtoux(l, unsigned long)
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define_ddi_strtox(l, long)
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define_ddi_strtoux(ll, unsigned long long)
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define_ddi_strtox(ll, long long)
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EXPORT_SYMBOL(ddi_strtoul);
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EXPORT_SYMBOL(ddi_strtol);
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EXPORT_SYMBOL(ddi_strtoll);
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EXPORT_SYMBOL(ddi_strtoull);
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int
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ddi_copyin(const void *from, void *to, size_t len, int flags)
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{
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/* Fake ioctl() issued by kernel, 'from' is a kernel address */
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if (flags & FKIOCTL) {
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memcpy(to, from, len);
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return 0;
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}
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return copyin(from, to, len);
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}
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EXPORT_SYMBOL(ddi_copyin);
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int
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ddi_copyout(const void *from, void *to, size_t len, int flags)
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{
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/* Fake ioctl() issued by kernel, 'from' is a kernel address */
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if (flags & FKIOCTL) {
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memcpy(to, from, len);
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return 0;
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}
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return copyout(from, to, len);
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}
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EXPORT_SYMBOL(ddi_copyout);
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#ifndef HAVE_PUT_TASK_STRUCT
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/*
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* This is only a stub function which should never be used. The SPL should
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* never be putting away the last reference on a task structure so this will
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* not be called. However, we still need to define it so the module does not
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* have undefined symbol at load time. That all said if this impossible
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* thing does somehow happen SBUG() immediately so we know about it.
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*/
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void
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__put_task_struct(struct task_struct *t)
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{
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SBUG();
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}
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EXPORT_SYMBOL(__put_task_struct);
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#endif /* HAVE_PUT_TASK_STRUCT */
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struct new_utsname *__utsname(void)
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{
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#ifdef HAVE_INIT_UTSNAME
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return init_utsname();
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#else
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return &system_utsname;
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#endif
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}
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EXPORT_SYMBOL(__utsname);
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static int
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set_hostid(void)
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{
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char sh_path[] = "/bin/sh";
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char *argv[] = { sh_path,
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"-c",
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"/usr/bin/hostid >/proc/sys/kernel/spl/hostid",
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NULL };
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char *envp[] = { "HOME=/",
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"TERM=linux",
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"PATH=/sbin:/usr/sbin:/bin:/usr/bin",
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NULL };
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int rc;
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/* Doing address resolution in the kernel is tricky and just
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* not a good idea in general. So to set the proper 'hw_serial'
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* use the usermodehelper support to ask '/bin/sh' to run
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* '/usr/bin/hostid' and redirect the result to /proc/sys/spl/hostid
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* for us to use. It's a horrific solution but it will do for now.
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*/
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rc = call_usermodehelper(sh_path, argv, envp, 1);
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if (rc)
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printk("SPL: Failed user helper '%s %s %s', rc = %d\n",
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argv[0], argv[1], argv[2], rc);
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return rc;
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}
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uint32_t
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zone_get_hostid(void *zone)
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{
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unsigned long hostid;
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/* Only the global zone is supported */
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ASSERT(zone == NULL);
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if (ddi_strtoul(hw_serial, NULL, HW_HOSTID_LEN-1, &hostid) != 0)
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return HW_INVALID_HOSTID;
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return (uint32_t)hostid;
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}
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EXPORT_SYMBOL(zone_get_hostid);
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#ifndef HAVE_KALLSYMS_LOOKUP_NAME
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/*
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* Because kallsyms_lookup_name() is no longer exported in the
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* mainline kernel we are forced to resort to somewhat drastic
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* measures. This function replaces the functionality by performing
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* an upcall to user space where /proc/kallsyms is consulted for
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* the requested address.
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*/
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#define GET_KALLSYMS_ADDR_CMD \
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"awk '{ if ( $3 == \"kallsyms_lookup_name\") { print $1 } }' " \
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"/proc/kallsyms >/proc/sys/kernel/spl/kallsyms_lookup_name"
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static int
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set_kallsyms_lookup_name(void)
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{
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char sh_path[] = "/bin/sh";
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char *argv[] = { sh_path,
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"-c",
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GET_KALLSYMS_ADDR_CMD,
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NULL };
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char *envp[] = { "HOME=/",
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"TERM=linux",
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"PATH=/sbin:/usr/sbin:/bin:/usr/bin",
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NULL };
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int rc;
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rc = call_usermodehelper(sh_path, argv, envp, 1);
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if (rc)
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printk("SPL: Failed user helper '%s %s %s', rc = %d\n",
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argv[0], argv[1], argv[2], rc);
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return rc;
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}
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#endif
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static int
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__init spl_init(void)
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{
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int rc = 0;
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if ((rc = debug_init()))
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return rc;
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if ((rc = spl_kmem_init()))
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GOTO(out1, rc);
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if ((rc = spl_mutex_init()))
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GOTO(out2, rc);
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if ((rc = spl_rw_init()))
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GOTO(out3, rc);
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if ((rc = spl_taskq_init()))
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GOTO(out4, rc);
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if ((rc = vn_init()))
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GOTO(out5, rc);
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if ((rc = proc_init()))
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GOTO(out6, rc);
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if ((rc = kstat_init()))
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GOTO(out7, rc);
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if ((rc = set_hostid()))
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GOTO(out8, rc = -EADDRNOTAVAIL);
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#ifndef HAVE_KALLSYMS_LOOKUP_NAME
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if ((rc = set_kallsyms_lookup_name()))
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GOTO(out8, rc = -EADDRNOTAVAIL);
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#endif /* HAVE_KALLSYMS_LOOKUP_NAME */
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if ((rc = spl_kmem_init_kallsyms_lookup()))
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GOTO(out8, rc);
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printk("SPL: Loaded Solaris Porting Layer v%s\n", SPL_META_VERSION);
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RETURN(rc);
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out8:
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kstat_fini();
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out7:
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proc_fini();
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out6:
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vn_fini();
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out5:
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spl_taskq_fini();
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out4:
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spl_rw_fini();
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out3:
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spl_mutex_fini();
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out2:
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spl_kmem_fini();
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out1:
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debug_fini();
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printk("SPL: Failed to Load Solaris Porting Layer v%s, "
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"rc = %d\n", SPL_META_VERSION, rc);
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return rc;
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}
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static void
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spl_fini(void)
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{
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ENTRY;
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printk("SPL: Unloaded Solaris Porting Layer v%s\n", SPL_META_VERSION);
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kstat_fini();
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proc_fini();
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vn_fini();
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spl_taskq_fini();
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spl_rw_fini();
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spl_mutex_fini();
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spl_kmem_fini();
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debug_fini();
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}
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/* Called when a dependent module is loaded */
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void
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spl_setup(void)
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{
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/*
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* At module load time the pwd is set to '/' on a Solaris system.
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* On a Linux system will be set to whatever directory the caller
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* was in when executing insmod/modprobe.
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*/
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vn_set_pwd("/");
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}
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EXPORT_SYMBOL(spl_setup);
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/* Called when a dependent module is unloaded */
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void
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spl_cleanup(void)
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{
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}
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EXPORT_SYMBOL(spl_cleanup);
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module_init(spl_init);
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module_exit(spl_fini);
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MODULE_AUTHOR("Lawrence Livermore National Labs");
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MODULE_DESCRIPTION("Solaris Porting Layer");
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MODULE_LICENSE("GPL");
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