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/9.0/sys/dev/ipmi/ipmi_smbios.c 210604 2010-07-29 13:46:37Z 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 smbios_table {
   56         uint8_t         anchor_string[4];
   57         uint8_t         checksum;
   58         uint8_t         length;
   59         uint8_t         major_version;
   60         uint8_t         minor_version;
   61         uint16_t        maximum_structure_size;
   62         uint8_t         entry_point_revision;
   63         uint8_t         formatted_area[5];
   64         uint8_t         DMI_anchor_string[5];
   65         uint8_t         intermediate_checksum;
   66         uint16_t        structure_table_length;
   67         uint32_t        structure_table_address;
   68         uint16_t        number_structures;
   69         uint8_t         BCD_revision;
   70 };
   71 
   72 struct structure_header {
   73         uint8_t         type;
   74         uint8_t         length;
   75         uint16_t        handle;
   76 };
   77 
   78 struct ipmi_entry {
   79         uint8_t         type;
   80         uint8_t         length;
   81         uint16_t        handle;
   82         uint8_t         interface_type;
   83         uint8_t         spec_revision;
   84         uint8_t         i2c_slave_address;
   85         uint8_t         NV_storage_device_address;
   86         uint64_t        base_address;
   87         uint8_t         base_address_modifier;
   88         uint8_t         interrupt_number;
   89 };
   90 
   91 /* Fields in the base_address field of an IPMI entry. */
   92 #define IPMI_BAR_MODE(ba)       ((ba) & 0x0000000000000001)
   93 #define IPMI_BAR_ADDR(ba)       ((ba) & 0xfffffffffffffffe)
   94 
   95 /* Fields in the base_address_modifier field of an IPMI entry. */
   96 #define IPMI_BAM_IRQ_TRIGGER    0x01
   97 #define IPMI_BAM_IRQ_POLARITY   0x02
   98 #define IPMI_BAM_IRQ_VALID      0x08
   99 #define IPMI_BAM_ADDR_LSB(bam)  (((bam) & 0x10) >> 4)
  100 #define IPMI_BAM_REG_SPACING(bam) (((bam) & 0xc0) >> 6)
  101 #define SPACING_8               0x0
  102 #define SPACING_32              0x1
  103 #define SPACING_16              0x2
  104 
  105 #define SMBIOS_START            0xf0000
  106 #define SMBIOS_STEP             0x10
  107 #define SMBIOS_OFF              0
  108 #define SMBIOS_LEN              4
  109 #define SMBIOS_SIG              "_SM_"
  110 
  111 typedef void (*smbios_callback_t)(struct structure_header *, void *);
  112 
  113 static struct ipmi_get_info ipmi_info;
  114 static int ipmi_probed;
  115 static struct mtx ipmi_info_mtx;
  116 MTX_SYSINIT(ipmi_info, &ipmi_info_mtx, "ipmi info", MTX_DEF);
  117 
  118 static void     ipmi_smbios_probe(struct ipmi_get_info *);
  119 static int      smbios_cksum(struct smbios_table *);
  120 static void     smbios_walk_table(uint8_t *, int, smbios_callback_t,
  121                     void *);
  122 static void     smbios_ipmi_info(struct structure_header *, void *);
  123 
  124 static void
  125 smbios_ipmi_info(struct structure_header *h, void *arg)
  126 {
  127         struct ipmi_get_info *info;
  128         struct ipmi_entry *s;
  129 
  130         if (h->type != 38 || h->length <
  131             offsetof(struct ipmi_entry, interrupt_number))
  132                 return;
  133         s = (struct ipmi_entry *)h;
  134         info = arg;
  135         bzero(info, sizeof(struct ipmi_get_info));
  136         switch (s->interface_type) {
  137         case KCS_MODE:
  138         case SMIC_MODE:
  139                 info->address = IPMI_BAR_ADDR(s->base_address) |
  140                     IPMI_BAM_ADDR_LSB(s->base_address_modifier);
  141                 info->io_mode = IPMI_BAR_MODE(s->base_address);
  142                 switch (IPMI_BAM_REG_SPACING(s->base_address_modifier)) {
  143                 case SPACING_8:
  144                         info->offset = 1;
  145                         break;
  146                 case SPACING_32:
  147                         info->offset = 4;
  148                         break;
  149                 case SPACING_16:
  150                         info->offset = 2;
  151                         break;
  152                 default:
  153                         printf("SMBIOS: Invalid register spacing\n");
  154                         return;
  155                 }
  156                 break;
  157         case SSIF_MODE:
  158                 if ((s->base_address & 0xffffffffffffff00) != 0) {
  159                         printf("SMBIOS: Invalid SSIF SMBus address, using BMC I2C slave address instead\n");
  160                         info->address = s->i2c_slave_address;
  161                         break;
  162                 }
  163                 info->address = IPMI_BAR_ADDR(s->base_address);
  164                 break;
  165         default:
  166                 return;
  167         }
  168         if (s->length > offsetof(struct ipmi_entry, interrupt_number)) {
  169                 if (s->interrupt_number > 15)
  170                         printf("SMBIOS: Non-ISA IRQ %d for IPMI\n",
  171                             s->interrupt_number);
  172                 else
  173                         info->irq = s->interrupt_number;
  174         }
  175         info->iface_type = s->interface_type;
  176 }
  177 
  178 static void
  179 smbios_walk_table(uint8_t *p, int entries, smbios_callback_t cb, void *arg)
  180 {
  181         struct structure_header *s;
  182 
  183         while (entries--) {
  184                 s = (struct structure_header *)p;
  185                 cb(s, arg);
  186 
  187                 /*
  188                  * Look for a double-nul after the end of the
  189                  * formatted area of this structure.
  190                  */
  191                 p += s->length;
  192                 while (!(p[0] == 0 && p[1] == 0))
  193                         p++;
  194 
  195                 /*
  196                  * Skip over the double-nul to the start of the next
  197                  * structure.
  198                  */
  199                 p += 2;
  200         }
  201 }
  202 
  203 /*
  204  * Walk the SMBIOS table looking for an IPMI (type 38) entry.  If we find
  205  * one, return the parsed data in the passed in ipmi_get_info structure and
  206  * return true.  If we don't find one, return false.
  207  */
  208 static void
  209 ipmi_smbios_probe(struct ipmi_get_info *info)
  210 {
  211         struct smbios_table *header;
  212         void *table;
  213         u_int32_t addr;
  214 
  215         bzero(info, sizeof(struct ipmi_get_info));
  216 
  217         /* Find the SMBIOS table header. */
  218         addr = bios_sigsearch(SMBIOS_START, SMBIOS_SIG, SMBIOS_LEN,
  219                               SMBIOS_STEP, SMBIOS_OFF);
  220         if (addr == 0)
  221                 return;
  222 
  223         /*
  224          * Map the header.  We first map a fixed size to get the actual
  225          * length and then map it a second time with the actual length so
  226          * we can verify the checksum.
  227          */
  228         header = pmap_mapbios(addr, sizeof(struct smbios_table));
  229         table = pmap_mapbios(addr, header->length);
  230         pmap_unmapbios((vm_offset_t)header, sizeof(struct smbios_table));
  231         header = table;
  232         if (smbios_cksum(header) != 0) {
  233                 pmap_unmapbios((vm_offset_t)header, header->length);
  234                 return;
  235         }
  236 
  237         /* Now map the actual table and walk it looking for an IPMI entry. */
  238         table = pmap_mapbios(header->structure_table_address,
  239             header->structure_table_length);
  240         smbios_walk_table(table, header->number_structures, smbios_ipmi_info,
  241             info);
  242 
  243         /* Unmap everything. */
  244         pmap_unmapbios((vm_offset_t)table, header->structure_table_length);
  245         pmap_unmapbios((vm_offset_t)header, header->length);
  246 }
  247 
  248 /*
  249  * Return the SMBIOS IPMI table entry info to the caller.  If we haven't
  250  * searched the IPMI table yet, search it.  Otherwise, return a cached
  251  * copy of the data.
  252  */
  253 int
  254 ipmi_smbios_identify(struct ipmi_get_info *info)
  255 {
  256 
  257         mtx_lock(&ipmi_info_mtx);
  258         switch (ipmi_probed) {
  259         case 0:
  260                 /* Need to probe the SMBIOS table. */
  261                 ipmi_probed++;
  262                 mtx_unlock(&ipmi_info_mtx);
  263                 ipmi_smbios_probe(&ipmi_info);
  264                 mtx_lock(&ipmi_info_mtx);
  265                 ipmi_probed++;
  266                 wakeup(&ipmi_info);
  267                 break;
  268         case 1:
  269                 /* Another thread is currently probing the table, so wait. */
  270                 while (ipmi_probed == 1)
  271                         msleep(&ipmi_info, &ipmi_info_mtx, 0, "ipmi info", 0);
  272                 break;
  273         default:
  274                 /* The cached data is available. */
  275                 break;
  276         }
  277 
  278         bcopy(&ipmi_info, info, sizeof(ipmi_info));
  279         mtx_unlock(&ipmi_info_mtx);
  280 
  281         return (info->iface_type != 0);
  282 }
  283 
  284 static int
  285 smbios_cksum(struct smbios_table *e)
  286 {
  287         u_int8_t *ptr;
  288         u_int8_t cksum;
  289         int i;
  290 
  291         ptr = (u_int8_t *)e;
  292         cksum = 0;
  293         for (i = 0; i < e->length; i++) {
  294                 cksum += ptr[i];
  295         }
  296 
  297         return (cksum);
  298 }
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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
