ipmi_smbios.c

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    1 /*-
    2  * Copyright (c) 2006 IronPort Systems Inc. <ambrisko@ironport.com>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/8.4/sys/dev/ipmi/ipmi_smbios.c 247482 2013-02-28 18:22:50Z jhb $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/bus.h>
   33 #include <sys/condvar.h>
   34 #include <sys/eventhandler.h>
   35 #include <sys/kernel.h>
   36 #include <sys/selinfo.h>
   37 
   38 #include <vm/vm.h>
   39 #include <vm/pmap.h>
   40 #include <machine/pc/bios.h>
   41 
   42 #ifdef LOCAL_MODULE
   43 #include <ipmi.h>
   44 #include <ipmivars.h>
   45 #else
   46 #include <sys/ipmi.h>
   47 #include <dev/ipmi/ipmivars.h>
   48 #endif
   49 
   50 #if __FreeBSD_version < 602110
   51 #define pmap_mapbios            pmap_mapdev
   52 #define pmap_unmapbios          pmap_unmapdev
   53 #endif
   54 
   55 struct ipmi_entry {
   56         uint8_t         type;
   57         uint8_t         length;
   58         uint16_t        handle;
   59         uint8_t         interface_type;
   60         uint8_t         spec_revision;
   61         uint8_t         i2c_slave_address;
   62         uint8_t         NV_storage_device_address;
   63         uint64_t        base_address;
   64         uint8_t         base_address_modifier;
   65         uint8_t         interrupt_number;
   66 };
   67 
   68 /* Fields in the base_address field of an IPMI entry. */
   69 #define IPMI_BAR_MODE(ba)       ((ba) & 0x0000000000000001)
   70 #define IPMI_BAR_ADDR(ba)       ((ba) & 0xfffffffffffffffe)
   71 
   72 /* Fields in the base_address_modifier field of an IPMI entry. */
   73 #define IPMI_BAM_IRQ_TRIGGER    0x01
   74 #define IPMI_BAM_IRQ_POLARITY   0x02
   75 #define IPMI_BAM_IRQ_VALID      0x08
   76 #define IPMI_BAM_ADDR_LSB(bam)  (((bam) & 0x10) >> 4)
   77 #define IPMI_BAM_REG_SPACING(bam) (((bam) & 0xc0) >> 6)
   78 #define SPACING_8               0x0
   79 #define SPACING_32              0x1
   80 #define SPACING_16              0x2
   81 
   82 typedef void (*smbios_callback_t)(struct smbios_structure_header *, void *);
   83 
   84 static struct ipmi_get_info ipmi_info;
   85 static int ipmi_probed;
   86 static struct mtx ipmi_info_mtx;
   87 MTX_SYSINIT(ipmi_info, &ipmi_info_mtx, "ipmi info", MTX_DEF);
   88 
   89 static void     ipmi_smbios_probe(struct ipmi_get_info *);
   90 static int      smbios_cksum(struct smbios_eps *);
   91 static void     smbios_walk_table(uint8_t *, int, smbios_callback_t,
   92                     void *);
   93 static void     smbios_ipmi_info(struct smbios_structure_header *, void *);
   94 
   95 static void
   96 smbios_ipmi_info(struct smbios_structure_header *h, void *arg)
   97 {
   98         struct ipmi_get_info *info;
   99         struct ipmi_entry *s;
  100 
  101         if (h->type != 38 || h->length <
  102             offsetof(struct ipmi_entry, interrupt_number))
  103                 return;
  104         s = (struct ipmi_entry *)h;
  105         info = arg;
  106         bzero(info, sizeof(struct ipmi_get_info));
  107         switch (s->interface_type) {
  108         case KCS_MODE:
  109         case SMIC_MODE:
  110                 info->address = IPMI_BAR_ADDR(s->base_address) |
  111                     IPMI_BAM_ADDR_LSB(s->base_address_modifier);
  112                 info->io_mode = IPMI_BAR_MODE(s->base_address);
  113                 switch (IPMI_BAM_REG_SPACING(s->base_address_modifier)) {
  114                 case SPACING_8:
  115                         info->offset = 1;
  116                         break;
  117                 case SPACING_32:
  118                         info->offset = 4;
  119                         break;
  120                 case SPACING_16:
  121                         info->offset = 2;
  122                         break;
  123                 default:
  124                         printf("SMBIOS: Invalid register spacing\n");
  125                         return;
  126                 }
  127                 break;
  128         case SSIF_MODE:
  129                 if ((s->base_address & 0xffffffffffffff00) != 0) {
  130                         printf("SMBIOS: Invalid SSIF SMBus address, using BMC I2C slave address instead\n");
  131                         info->address = s->i2c_slave_address;
  132                         break;
  133                 }
  134                 info->address = IPMI_BAR_ADDR(s->base_address);
  135                 break;
  136         default:
  137                 return;
  138         }
  139         if (s->length > offsetof(struct ipmi_entry, interrupt_number)) {
  140                 if (s->interrupt_number > 15)
  141                         printf("SMBIOS: Non-ISA IRQ %d for IPMI\n",
  142                             s->interrupt_number);
  143                 else
  144                         info->irq = s->interrupt_number;
  145         }
  146         info->iface_type = s->interface_type;
  147 }
  148 
  149 static void
  150 smbios_walk_table(uint8_t *p, int entries, smbios_callback_t cb, void *arg)
  151 {
  152         struct smbios_structure_header *s;
  153 
  154         while (entries--) {
  155                 s = (struct smbios_structure_header *)p;
  156                 cb(s, arg);
  157 
  158                 /*
  159                  * Look for a double-nul after the end of the
  160                  * formatted area of this structure.
  161                  */
  162                 p += s->length;
  163                 while (!(p[0] == 0 && p[1] == 0))
  164                         p++;
  165 
  166                 /*
  167                  * Skip over the double-nul to the start of the next
  168                  * structure.
  169                  */
  170                 p += 2;
  171         }
  172 }
  173 
  174 /*
  175  * Walk the SMBIOS table looking for an IPMI (type 38) entry.  If we find
  176  * one, return the parsed data in the passed in ipmi_get_info structure and
  177  * return true.  If we don't find one, return false.
  178  */
  179 static void
  180 ipmi_smbios_probe(struct ipmi_get_info *info)
  181 {
  182         struct smbios_eps *header;
  183         void *table;
  184         u_int32_t addr;
  185 
  186         bzero(info, sizeof(struct ipmi_get_info));
  187 
  188         /* Find the SMBIOS table header. */
  189         addr = bios_sigsearch(SMBIOS_START, SMBIOS_SIG, SMBIOS_LEN,
  190                               SMBIOS_STEP, SMBIOS_OFF);
  191         if (addr == 0)
  192                 return;
  193 
  194         /*
  195          * Map the header.  We first map a fixed size to get the actual
  196          * length and then map it a second time with the actual length so
  197          * we can verify the checksum.
  198          */
  199         header = pmap_mapbios(addr, sizeof(struct smbios_eps));
  200         table = pmap_mapbios(addr, header->length);
  201         pmap_unmapbios((vm_offset_t)header, sizeof(struct smbios_eps));
  202         header = table;
  203         if (smbios_cksum(header) != 0) {
  204                 pmap_unmapbios((vm_offset_t)header, header->length);
  205                 return;
  206         }
  207 
  208         /* Now map the actual table and walk it looking for an IPMI entry. */
  209         table = pmap_mapbios(header->structure_table_address,
  210             header->structure_table_length);
  211         smbios_walk_table(table, header->number_structures, smbios_ipmi_info,
  212             info);
  213 
  214         /* Unmap everything. */
  215         pmap_unmapbios((vm_offset_t)table, header->structure_table_length);
  216         pmap_unmapbios((vm_offset_t)header, header->length);
  217 }
  218 
  219 /*
  220  * Return the SMBIOS IPMI table entry info to the caller.  If we haven't
  221  * searched the IPMI table yet, search it.  Otherwise, return a cached
  222  * copy of the data.
  223  */
  224 int
  225 ipmi_smbios_identify(struct ipmi_get_info *info)
  226 {
  227 
  228         mtx_lock(&ipmi_info_mtx);
  229         switch (ipmi_probed) {
  230         case 0:
  231                 /* Need to probe the SMBIOS table. */
  232                 ipmi_probed++;
  233                 mtx_unlock(&ipmi_info_mtx);
  234                 ipmi_smbios_probe(&ipmi_info);
  235                 mtx_lock(&ipmi_info_mtx);
  236                 ipmi_probed++;
  237                 wakeup(&ipmi_info);
  238                 break;
  239         case 1:
  240                 /* Another thread is currently probing the table, so wait. */
  241                 while (ipmi_probed == 1)
  242                         msleep(&ipmi_info, &ipmi_info_mtx, 0, "ipmi info", 0);
  243                 break;
  244         default:
  245                 /* The cached data is available. */
  246                 break;
  247         }
  248 
  249         bcopy(&ipmi_info, info, sizeof(ipmi_info));
  250         mtx_unlock(&ipmi_info_mtx);
  251 
  252         return (info->iface_type != 0);
  253 }
  254 
  255 static int
  256 smbios_cksum(struct smbios_eps *e)
  257 {
  258         u_int8_t *ptr;
  259         u_int8_t cksum;
  260         int i;
  261 
  262         ptr = (u_int8_t *)e;
  263         cksum = 0;
  264         for (i = 0; i < e->length; i++) {
  265                 cksum += ptr[i];
  266         }
  267 
  268         return (cksum);
  269 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/ipmi/ipmi_smbios.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/ipmi/ipmi_smbios.c