release/src-rt-6.x/linux/linux-2.6/drivers/acpi/blacklist.c

   1 /*
   2  *  blacklist.c
   3  *
   4  *  Check to see if the given machine has a known bad ACPI BIOS
   5  *  or if the BIOS is too old.
   6  *
   7  *  Copyright (C) 2004 Len Brown <len.brown@intel.com>
   8  *  Copyright (C) 2002 Andy Grover <andrew.grover@intel.com>
   9  *
  10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  11  *
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or (at
  15  *  your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful, but
  18  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20  *  General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License along
  23  *  with this program; if not, write to the Free Software Foundation, Inc.,
  24  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  25  *
  26  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  27  */
  28
  29 #include <linux/kernel.h>
  30 #include <linux/module.h>
  31 #include <linux/init.h>
  32 #include <linux/acpi.h>
  33 #include <acpi/acpi_bus.h>
  34 #include <linux/dmi.h>
  35
  36 enum acpi_blacklist_predicates {
  37         all_versions,
  38         less_than_or_equal,
  39         equal,
  40         greater_than_or_equal,
  41 };
  42
  43 struct acpi_blacklist_item {
  44         char oem_id[7];
  45         char oem_table_id[9];
  46         u32 oem_revision;
  47         char *table;
  48         enum acpi_blacklist_predicates oem_revision_predicate;
  49         char *reason;
  50         u32 is_critical_error;
  51 };
  52
  53 /*
  54  * POLICY: If *anything* doesn't work, put it on the blacklist.
  55  *         If they are critical errors, mark it critical, and abort driver load.
  56  */
  57 static struct acpi_blacklist_item acpi_blacklist[] __initdata = {
  58         /* Compaq Presario 1700 */
  59         {"PTLTD ", "  DSDT  ", 0x06040000, ACPI_SIG_DSDT, less_than_or_equal,
  60          "Multiple problems", 1},
  61         /* Sony FX120, FX140, FX150? */
  62         {"SONY  ", "U0      ", 0x20010313, ACPI_SIG_DSDT, less_than_or_equal,
  63          "ACPI driver problem", 1},
  64         /* Compaq Presario 800, Insyde BIOS */
  65         {"INT440", "SYSFexxx", 0x00001001, ACPI_SIG_DSDT, less_than_or_equal,
  66          "Does not use _REG to protect EC OpRegions", 1},
  67         /* IBM 600E - _ADR should return 7, but it returns 1 */
  68         {"IBM   ", "TP600E  ", 0x00000105, ACPI_SIG_DSDT, less_than_or_equal,
  69          "Incorrect _ADR", 1},
  70         {"ASUS\0\0", "P2B-S   ", 0, ACPI_SIG_DSDT, all_versions,
  71          "Bogus PCI routing", 1},
  72
  73         {""}
  74 };
  75
  76 #if     CONFIG_ACPI_BLACKLIST_YEAR
  77
  78 static int __init blacklist_by_year(void)
  79 {
  80         int year = dmi_get_year(DMI_BIOS_DATE);
  81         /* Doesn't exist? Likely an old system */
  82         if (year == -1) {
  83                 printk(KERN_ERR PREFIX "no DMI BIOS year, "
  84                         "acpi=force is required to enable ACPI\n" );
  85                 return 1;
  86         }
  87         /* 0? Likely a buggy new BIOS */
  88         if (year == 0) {
  89                 printk(KERN_ERR PREFIX "DMI BIOS year==0, "
  90                         "assuming ACPI-capable machine\n" );
  91                 return 0;
  92         }
  93         if (year < CONFIG_ACPI_BLACKLIST_YEAR) {
  94                 printk(KERN_ERR PREFIX "BIOS age (%d) fails cutoff (%d), "
  95                        "acpi=force is required to enable ACPI\n",
  96                        year, CONFIG_ACPI_BLACKLIST_YEAR);
  97                 return 1;
  98         }
  99         return 0;
 100 }
 101 #else
 102 static inline int blacklist_by_year(void)
 103 {
 104         return 0;
 105 }
 106 #endif
 107
 108 int __init acpi_blacklisted(void)
 109 {
 110         int i = 0;
 111         int blacklisted = 0;
 112         struct acpi_table_header table_header;
 113
 114         while (acpi_blacklist[i].oem_id[0] != '\0') {
 115                 if (acpi_get_table_header(acpi_blacklist[i].table, 0, &table_header)) {
 116                         i++;
 117                         continue;
 118                 }
 119
 120                 if (strncmp(acpi_blacklist[i].oem_id, table_header.oem_id, 6)) {
 121                         i++;
 122                         continue;
 123                 }
 124
 125                 if (strncmp
 126                     (acpi_blacklist[i].oem_table_id, table_header.oem_table_id,
 127                      8)) {
 128                         i++;
 129                         continue;
 130                 }
 131
 132                 if ((acpi_blacklist[i].oem_revision_predicate == all_versions)
 133                     || (acpi_blacklist[i].oem_revision_predicate ==
 134                         less_than_or_equal
 135                         && table_header.oem_revision <=
 136                         acpi_blacklist[i].oem_revision)
 137                     || (acpi_blacklist[i].oem_revision_predicate ==
 138                         greater_than_or_equal
 139                         && table_header.oem_revision >=
 140                         acpi_blacklist[i].oem_revision)
 141                     || (acpi_blacklist[i].oem_revision_predicate == equal
 142                         && table_header.oem_revision ==
 143                         acpi_blacklist[i].oem_revision)) {
 144
 145                         printk(KERN_ERR PREFIX
 146                                "Vendor \"%6.6s\" System \"%8.8s\" "
 147                                "Revision 0x%x has a known ACPI BIOS problem.\n",
 148                                acpi_blacklist[i].oem_id,
 149                                acpi_blacklist[i].oem_table_id,
 150                                acpi_blacklist[i].oem_revision);
 151
 152                         printk(KERN_ERR PREFIX
 153                                "Reason: %s. This is a %s error\n",
 154                                acpi_blacklist[i].reason,
 155                                (acpi_blacklist[i].
 156                                 is_critical_error ? "non-recoverable" :
 157                                 "recoverable"));
 158
 159                         blacklisted = acpi_blacklist[i].is_critical_error;
 160                         break;
 161                 } else {
 162                         i++;
 163                 }
 164         }
 165
 166         blacklisted += blacklist_by_year();
 167
 168         return blacklisted;
 169 }