drivers/acpi/tables.c

   1 /*
   2  *  acpi_tables.c - ACPI Boot-Time Table Parsing
   3  *
   4  *  Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   5  *
   6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  23  *
  24  */
  25
  26 #define pr_fmt(fmt) "ACPI: " fmt
  27
  28 #include <linux/init.h>
  29 #include <linux/kernel.h>
  30 #include <linux/smp.h>
  31 #include <linux/string.h>
  32 #include <linux/types.h>
  33 #include <linux/irq.h>
  34 #include <linux/errno.h>
  35 #include <linux/acpi.h>
  36 #include <linux/bootmem.h>
  37
  38 #define ACPI_MAX_TABLES         128
  39
  40 static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" };
  41 static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" };
  42
  43 static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata;
  44
  45 static int acpi_apic_instance __initdata;
  46
  47 void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
  48 {
  49         if (!header)
  50                 return;
  51
  52         switch (header->type) {
  53
  54         case ACPI_MADT_TYPE_LOCAL_APIC:
  55                 {
  56                         struct acpi_madt_local_apic *p =
  57                             (struct acpi_madt_local_apic *)header;
  58                         pr_info("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
  59                                 p->processor_id, p->id,
  60                                 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
  61                 }
  62                 break;
  63
  64         case ACPI_MADT_TYPE_LOCAL_X2APIC:
  65                 {
  66                         struct acpi_madt_local_x2apic *p =
  67                             (struct acpi_madt_local_x2apic *)header;
  68                         pr_info("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
  69                                 p->local_apic_id, p->uid,
  70                                 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
  71                 }
  72                 break;
  73
  74         case ACPI_MADT_TYPE_IO_APIC:
  75                 {
  76                         struct acpi_madt_io_apic *p =
  77                             (struct acpi_madt_io_apic *)header;
  78                         pr_info("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
  79                                 p->id, p->address, p->global_irq_base);
  80                 }
  81                 break;
  82
  83         case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
  84                 {
  85                         struct acpi_madt_interrupt_override *p =
  86                             (struct acpi_madt_interrupt_override *)header;
  87                         pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n",
  88                                 p->bus, p->source_irq, p->global_irq,
  89                                 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
  90                                 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]);
  91                         if (p->inti_flags  &
  92                             ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK))
  93                                 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n",
  94                                         p->inti_flags  &
  95                                         ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK));
  96                 }
  97                 break;
  98
  99         case ACPI_MADT_TYPE_NMI_SOURCE:
 100                 {
 101                         struct acpi_madt_nmi_source *p =
 102                             (struct acpi_madt_nmi_source *)header;
 103                         pr_info("NMI_SRC (%s %s global_irq %d)\n",
 104                                 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
 105                                 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
 106                                 p->global_irq);
 107                 }
 108                 break;
 109
 110         case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
 111                 {
 112                         struct acpi_madt_local_apic_nmi *p =
 113                             (struct acpi_madt_local_apic_nmi *)header;
 114                         pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n",
 115                                 p->processor_id,
 116                                 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ],
 117                                 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
 118                                 p->lint);
 119                 }
 120                 break;
 121
 122         case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI:
 123                 {
 124                         u16 polarity, trigger;
 125                         struct acpi_madt_local_x2apic_nmi *p =
 126                             (struct acpi_madt_local_x2apic_nmi *)header;
 127
 128                         polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK;
 129                         trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
 130
 131                         pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n",
 132                                 p->uid,
 133                                 mps_inti_flags_polarity[polarity],
 134                                 mps_inti_flags_trigger[trigger],
 135                                 p->lint);
 136                 }
 137                 break;
 138
 139         case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE:
 140                 {
 141                         struct acpi_madt_local_apic_override *p =
 142                             (struct acpi_madt_local_apic_override *)header;
 143                         pr_info("LAPIC_ADDR_OVR (address[%p])\n",
 144                                 (void *)(unsigned long)p->address);
 145                 }
 146                 break;
 147
 148         case ACPI_MADT_TYPE_IO_SAPIC:
 149                 {
 150                         struct acpi_madt_io_sapic *p =
 151                             (struct acpi_madt_io_sapic *)header;
 152                         pr_info("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
 153                                 p->id, (void *)(unsigned long)p->address,
 154                                 p->global_irq_base);
 155                 }
 156                 break;
 157
 158         case ACPI_MADT_TYPE_LOCAL_SAPIC:
 159                 {
 160                         struct acpi_madt_local_sapic *p =
 161                             (struct acpi_madt_local_sapic *)header;
 162                         pr_info("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
 163                                 p->processor_id, p->id, p->eid,
 164                                 (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
 165                 }
 166                 break;
 167
 168         case ACPI_MADT_TYPE_INTERRUPT_SOURCE:
 169                 {
 170                         struct acpi_madt_interrupt_source *p =
 171                             (struct acpi_madt_interrupt_source *)header;
 172                         pr_info("PLAT_INT_SRC (%s %s type[0x%x] id[0x%04x] eid[0x%x] iosapic_vector[0x%x] global_irq[0x%x]\n",
 173                                 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
 174                                 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
 175                                 p->type, p->id, p->eid, p->io_sapic_vector,
 176                                 p->global_irq);
 177                 }
 178                 break;
 179
 180         default:
 181                 pr_warn("Found unsupported MADT entry (type = 0x%x)\n",
 182                         header->type);
 183                 break;
 184         }
 185 }
 186
 187
 188 int __init
 189 acpi_table_parse_entries(char *id,
 190                              unsigned long table_size,
 191                              int entry_id,
 192                              acpi_tbl_entry_handler handler,
 193                              unsigned int max_entries)
 194 {
 195         struct acpi_table_header *table_header = NULL;
 196         struct acpi_subtable_header *entry;
 197         unsigned int count = 0;
 198         unsigned long table_end;
 199         acpi_size tbl_size;
 200
 201         if (acpi_disabled)
 202                 return -ENODEV;
 203
 204         if (!handler)
 205                 return -EINVAL;
 206
 207         if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
 208                 acpi_get_table_with_size(id, acpi_apic_instance, &table_header, &tbl_size);
 209         else
 210                 acpi_get_table_with_size(id, 0, &table_header, &tbl_size);
 211
 212         if (!table_header) {
 213                 pr_warn("%4.4s not present\n", id);
 214                 return -ENODEV;
 215         }
 216
 217         table_end = (unsigned long)table_header + table_header->length;
 218
 219         /* Parse all entries looking for a match. */
 220
 221         entry = (struct acpi_subtable_header *)
 222             ((unsigned long)table_header + table_size);
 223
 224         while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) <
 225                table_end) {
 226                 if (entry->type == entry_id
 227                     && (!max_entries || count++ < max_entries))
 228                         if (handler(entry, table_end))
 229                                 goto err;
 230
 231                 /*
 232                  * If entry->length is 0, break from this loop to avoid
 233                  * infinite loop.
 234                  */
 235                 if (entry->length == 0) {
 236                         pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, entry_id);
 237                         goto err;
 238                 }
 239
 240                 entry = (struct acpi_subtable_header *)
 241                     ((unsigned long)entry + entry->length);
 242         }
 243         if (max_entries && count > max_entries) {
 244                 pr_warn("[%4.4s:0x%02x] ignored %i entries of %i found\n",
 245                         id, entry_id, count - max_entries, count);
 246         }
 247
 248         early_acpi_os_unmap_memory((char *)table_header, tbl_size);
 249         return count;
 250 err:
 251         early_acpi_os_unmap_memory((char *)table_header, tbl_size);
 252         return -EINVAL;
 253 }
 254
 255 int __init
 256 acpi_table_parse_madt(enum acpi_madt_type id,
 257                       acpi_tbl_entry_handler handler, unsigned int max_entries)
 258 {
 259         return acpi_table_parse_entries(ACPI_SIG_MADT,
 260                                             sizeof(struct acpi_table_madt), id,
 261                                             handler, max_entries);
 262 }
 263
 264 /**
 265  * acpi_table_parse - find table with @id, run @handler on it
 266  * @id: table id to find
 267  * @handler: handler to run
 268  *
 269  * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
 270  * run @handler on it.
 271  *
 272  * Return 0 if table found, -errno if not.
 273  */
 274 int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
 275 {
 276         struct acpi_table_header *table = NULL;
 277         acpi_size tbl_size;
 278
 279         if (acpi_disabled)
 280                 return -ENODEV;
 281
 282         if (!id || !handler)
 283                 return -EINVAL;
 284
 285         if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
 286                 acpi_get_table_with_size(id, acpi_apic_instance, &table, &tbl_size);
 287         else
 288                 acpi_get_table_with_size(id, 0, &table, &tbl_size);
 289
 290         if (table) {
 291                 handler(table);
 292                 early_acpi_os_unmap_memory(table, tbl_size);
 293                 return 0;
 294         } else
 295                 return -ENODEV;
 296 }
 297
 298 /*
 299  * The BIOS is supposed to supply a single APIC/MADT,
 300  * but some report two.  Provide a knob to use either.
 301  * (don't you wish instance 0 and 1 were not the same?)
 302  */
 303 static void __init check_multiple_madt(void)
 304 {
 305         struct acpi_table_header *table = NULL;
 306         acpi_size tbl_size;
 307
 308         acpi_get_table_with_size(ACPI_SIG_MADT, 2, &table, &tbl_size);
 309         if (table) {
 310                 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n",
 311                         acpi_apic_instance);
 312                 pr_warn("If \"acpi_apic_instance=%d\" works better, "
 313                         "notify linux-acpi@vger.kernel.org\n",
 314                         acpi_apic_instance ? 0 : 2);
 315                 early_acpi_os_unmap_memory(table, tbl_size);
 316
 317         } else
 318                 acpi_apic_instance = 0;
 319
 320         return;
 321 }
 322
 323 /*
 324  * acpi_table_init()
 325  *
 326  * find RSDP, find and checksum SDT/XSDT.
 327  * checksum all tables, print SDT/XSDT
 328  *
 329  * result: sdt_entry[] is initialized
 330  */
 331
 332 int __init acpi_table_init(void)
 333 {
 334         acpi_status status;
 335
 336         status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
 337         if (ACPI_FAILURE(status))
 338                 return -EINVAL;
 339
 340         check_multiple_madt();
 341         return 0;
 342 }
 343
 344 static int __init acpi_parse_apic_instance(char *str)
 345 {
 346         if (!str)
 347                 return -EINVAL;
 348
 349         acpi_apic_instance = simple_strtoul(str, NULL, 0);
 350
 351         pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance);
 352
 353         return 0;
 354 }
 355
 356 early_param("acpi_apic_instance", acpi_parse_apic_instance);