1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2006 IronPort Systems Inc. <ambrisko@ironport.com> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/bus.h> 32 #include <sys/condvar.h> 33 #include <sys/eventhandler.h> 34 #include <sys/kernel.h> 35 #include <sys/selinfo.h> 36 #include <sys/efi.h> 37 38 #include <vm/vm.h> 39 #include <vm/pmap.h> 40 #if defined(__amd64__) || defined(__i386__) 41 #include <machine/pc/bios.h> 42 #endif 43 #include <dev/smbios/smbios.h> 44 45 #ifdef LOCAL_MODULE 46 #include <ipmi.h> 47 #include <ipmivars.h> 48 #else 49 #include <sys/ipmi.h> 50 #include <dev/ipmi/ipmivars.h> 51 #endif 52 53 struct ipmi_entry { 54 uint8_t type; 55 uint8_t length; 56 uint16_t handle; 57 uint8_t interface_type; 58 uint8_t spec_revision; 59 uint8_t i2c_slave_address; 60 uint8_t NV_storage_device_address; 61 uint64_t base_address; 62 uint8_t base_address_modifier; 63 uint8_t interrupt_number; 64 }; 65 66 /* Fields in the base_address field of an IPMI entry. */ 67 #define IPMI_BAR_MODE(ba) ((ba) & 0x0000000000000001) 68 #define IPMI_BAR_ADDR(ba) ((ba) & 0xfffffffffffffffe) 69 70 /* Fields in the base_address_modifier field of an IPMI entry. */ 71 #define IPMI_BAM_IRQ_TRIGGER 0x01 72 #define IPMI_BAM_IRQ_POLARITY 0x02 73 #define IPMI_BAM_IRQ_VALID 0x08 74 #define IPMI_BAM_ADDR_LSB(bam) (((bam) & 0x10) >> 4) 75 #define IPMI_BAM_REG_SPACING(bam) (((bam) & 0xc0) >> 6) 76 #define SPACING_8 0x0 77 #define SPACING_32 0x1 78 #define SPACING_16 0x2 79 80 static struct ipmi_get_info ipmi_info; 81 static int ipmi_probed; 82 static struct mtx ipmi_info_mtx; 83 MTX_SYSINIT(ipmi_info, &ipmi_info_mtx, "ipmi info", MTX_DEF); 84 85 static void ipmi_smbios_probe(struct ipmi_get_info *); 86 static int smbios_cksum(struct smbios_eps *); 87 static void smbios_ipmi_info(struct smbios_structure_header *, void *); 88 89 static void 90 smbios_ipmi_info(struct smbios_structure_header *h, void *arg) 91 { 92 struct ipmi_get_info *info; 93 struct ipmi_entry *s; 94 95 if (h->type != 38 || h->length < 96 offsetof(struct ipmi_entry, interrupt_number)) 97 return; 98 s = (struct ipmi_entry *)h; 99 info = arg; 100 bzero(info, sizeof(struct ipmi_get_info)); 101 switch (s->interface_type) { 102 case KCS_MODE: 103 case SMIC_MODE: 104 case BT_MODE: 105 info->address = IPMI_BAR_ADDR(s->base_address) | 106 IPMI_BAM_ADDR_LSB(s->base_address_modifier); 107 info->io_mode = IPMI_BAR_MODE(s->base_address); 108 switch (IPMI_BAM_REG_SPACING(s->base_address_modifier)) { 109 case SPACING_8: 110 info->offset = 1; 111 break; 112 case SPACING_32: 113 info->offset = 4; 114 break; 115 case SPACING_16: 116 info->offset = 2; 117 break; 118 default: 119 printf("SMBIOS: Invalid register spacing\n"); 120 return; 121 } 122 break; 123 case SSIF_MODE: 124 if ((s->base_address & 0xffffffffffffff00) != 0) { 125 printf("SMBIOS: Invalid SSIF SMBus address, using BMC I2C slave address instead\n"); 126 info->address = s->i2c_slave_address; 127 break; 128 } 129 info->address = IPMI_BAR_ADDR(s->base_address); 130 break; 131 default: 132 return; 133 } 134 if (s->length > offsetof(struct ipmi_entry, interrupt_number)) { 135 if (s->interrupt_number > 15) 136 printf("SMBIOS: Non-ISA IRQ %d for IPMI\n", 137 s->interrupt_number); 138 else 139 info->irq = s->interrupt_number; 140 } 141 info->iface_type = s->interface_type; 142 } 143 144 /* 145 * Walk the SMBIOS table looking for an IPMI (type 38) entry. If we find 146 * one, return the parsed data in the passed in ipmi_get_info structure and 147 * return true. If we don't find one, return false. 148 */ 149 static void 150 ipmi_smbios_probe(struct ipmi_get_info *info) 151 { 152 #ifdef ARCH_MAY_USE_EFI 153 struct uuid efi_smbios; 154 void *addr_efi; 155 #endif 156 struct smbios_eps *header; 157 void *table; 158 u_int32_t addr; 159 160 addr = 0; 161 bzero(info, sizeof(struct ipmi_get_info)); 162 163 #ifdef ARCH_MAY_USE_EFI 164 efi_smbios = (struct uuid)EFI_TABLE_SMBIOS; 165 if (!efi_get_table(&efi_smbios, &addr_efi)) 166 addr = (vm_paddr_t)addr_efi; 167 #endif 168 169 if (addr == 0) 170 /* Find the SMBIOS table header. */ 171 addr = bios_sigsearch(SMBIOS_START, SMBIOS_SIG, SMBIOS_LEN, 172 SMBIOS_STEP, SMBIOS_OFF); 173 if (addr == 0) 174 return; 175 176 /* 177 * Map the header. We first map a fixed size to get the actual 178 * length and then map it a second time with the actual length so 179 * we can verify the checksum. 180 */ 181 header = pmap_mapbios(addr, sizeof(struct smbios_eps)); 182 table = pmap_mapbios(addr, header->length); 183 pmap_unmapbios(header, sizeof(struct smbios_eps)); 184 header = table; 185 if (smbios_cksum(header) != 0) { 186 pmap_unmapbios(header, header->length); 187 return; 188 } 189 190 /* Now map the actual table and walk it looking for an IPMI entry. */ 191 table = pmap_mapbios(header->structure_table_address, 192 header->structure_table_length); 193 smbios_walk_table(table, header->number_structures, smbios_ipmi_info, 194 info); 195 196 /* Unmap everything. */ 197 pmap_unmapbios(table, header->structure_table_length); 198 pmap_unmapbios(header, header->length); 199 } 200 201 /* 202 * Return the SMBIOS IPMI table entry info to the caller. If we haven't 203 * searched the IPMI table yet, search it. Otherwise, return a cached 204 * copy of the data. 205 */ 206 int 207 ipmi_smbios_identify(struct ipmi_get_info *info) 208 { 209 210 mtx_lock(&ipmi_info_mtx); 211 switch (ipmi_probed) { 212 case 0: 213 /* Need to probe the SMBIOS table. */ 214 ipmi_probed++; 215 mtx_unlock(&ipmi_info_mtx); 216 ipmi_smbios_probe(&ipmi_info); 217 mtx_lock(&ipmi_info_mtx); 218 ipmi_probed++; 219 wakeup(&ipmi_info); 220 break; 221 case 1: 222 /* Another thread is currently probing the table, so wait. */ 223 while (ipmi_probed == 1) 224 msleep(&ipmi_info, &ipmi_info_mtx, 0, "ipmi info", 0); 225 break; 226 default: 227 /* The cached data is available. */ 228 break; 229 } 230 231 bcopy(&ipmi_info, info, sizeof(ipmi_info)); 232 mtx_unlock(&ipmi_info_mtx); 233 234 return (info->iface_type != 0); 235 } 236 237 static int 238 smbios_cksum(struct smbios_eps *e) 239 { 240 u_int8_t *ptr; 241 u_int8_t cksum; 242 int i; 243 244 ptr = (u_int8_t *)e; 245 cksum = 0; 246 for (i = 0; i < e->length; i++) { 247 cksum += ptr[i]; 248 } 249 250 return (cksum); 251 } 252