drivers/acpi/debug.c

   1 /*
   2  * debug.c - ACPI debug interface to userspace.
   3  */
   4
   5 #include <linux/proc_fs.h>
   6 #include <linux/init.h>
   7 #include <linux/module.h>
   8 #include <linux/kernel.h>
   9 #include <linux/moduleparam.h>
  10 #include <asm/uaccess.h>
  11 #include <acpi/acpi_drivers.h>
  12 #include <acpi/acglobal.h>
  13
  14 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
  15 ACPI_MODULE_NAME                ("debug")
  16
  17 #define ACPI_SYSTEM_FILE_DEBUG_LAYER    "debug_layer"
  18 #define ACPI_SYSTEM_FILE_DEBUG_LEVEL    "debug_level"
  19
  20 #ifdef MODULE_PARAM_PREFIX
  21 #undef MODULE_PARAM_PREFIX
  22 #endif
  23
  24 #define MODULE_PARAM_PREFIX
  25 module_param(acpi_dbg_layer, uint, 0400);
  26 module_param(acpi_dbg_level, uint, 0400);
  27
  28 struct acpi_dlayer {
  29         const char *name;
  30         unsigned long value;
  31 };
  32 struct acpi_dlevel {
  33         const char *name;
  34         unsigned long value;
  35 };
  36 #define ACPI_DEBUG_INIT(v)      { .name = #v, .value = v }
  37
  38 static const struct acpi_dlayer acpi_debug_layers[] =
  39 {
  40         ACPI_DEBUG_INIT(ACPI_UTILITIES),
  41         ACPI_DEBUG_INIT(ACPI_HARDWARE),
  42         ACPI_DEBUG_INIT(ACPI_EVENTS),
  43         ACPI_DEBUG_INIT(ACPI_TABLES),
  44         ACPI_DEBUG_INIT(ACPI_NAMESPACE),
  45         ACPI_DEBUG_INIT(ACPI_PARSER),
  46         ACPI_DEBUG_INIT(ACPI_DISPATCHER),
  47         ACPI_DEBUG_INIT(ACPI_EXECUTER),
  48         ACPI_DEBUG_INIT(ACPI_RESOURCES),
  49         ACPI_DEBUG_INIT(ACPI_CA_DEBUGGER),
  50         ACPI_DEBUG_INIT(ACPI_OS_SERVICES),
  51         ACPI_DEBUG_INIT(ACPI_CA_DISASSEMBLER),
  52         ACPI_DEBUG_INIT(ACPI_COMPILER),
  53         ACPI_DEBUG_INIT(ACPI_TOOLS),
  54 };
  55
  56 static const struct acpi_dlevel acpi_debug_levels[] =
  57 {
  58         ACPI_DEBUG_INIT(ACPI_LV_ERROR),
  59         ACPI_DEBUG_INIT(ACPI_LV_WARN),
  60         ACPI_DEBUG_INIT(ACPI_LV_INIT),
  61         ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT),
  62         ACPI_DEBUG_INIT(ACPI_LV_INFO),
  63
  64         ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES),
  65         ACPI_DEBUG_INIT(ACPI_LV_PARSE),
  66         ACPI_DEBUG_INIT(ACPI_LV_LOAD),
  67         ACPI_DEBUG_INIT(ACPI_LV_DISPATCH),
  68         ACPI_DEBUG_INIT(ACPI_LV_EXEC),
  69         ACPI_DEBUG_INIT(ACPI_LV_NAMES),
  70         ACPI_DEBUG_INIT(ACPI_LV_OPREGION),
  71         ACPI_DEBUG_INIT(ACPI_LV_BFIELD),
  72         ACPI_DEBUG_INIT(ACPI_LV_TABLES),
  73         ACPI_DEBUG_INIT(ACPI_LV_VALUES),
  74         ACPI_DEBUG_INIT(ACPI_LV_OBJECTS),
  75         ACPI_DEBUG_INIT(ACPI_LV_RESOURCES),
  76         ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS),
  77         ACPI_DEBUG_INIT(ACPI_LV_PACKAGE),
  78
  79         ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS),
  80         ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS),
  81         ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS),
  82
  83         ACPI_DEBUG_INIT(ACPI_LV_MUTEX),
  84         ACPI_DEBUG_INIT(ACPI_LV_THREADS),
  85         ACPI_DEBUG_INIT(ACPI_LV_IO),
  86         ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS),
  87
  88         ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE),
  89         ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO),
  90         ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES),
  91         ACPI_DEBUG_INIT(ACPI_LV_EVENTS),
  92 };
  93
  94 static int
  95 acpi_system_read_debug (
  96         char                    *page,
  97         char                    **start,
  98         off_t                   off,
  99         int                     count,
 100         int                     *eof,
 101         void                    *data)
 102 {
 103         char                    *p = page;
 104         int                     size = 0;
 105         unsigned int            i;
 106
 107         if (off != 0)
 108                 goto end;
 109
 110         p += sprintf(p, "%-25s\tHex        SET\n", "Description");
 111
 112         switch ((unsigned long) data) {
 113         case 0:
 114                 for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) {
 115                         p += sprintf(p, "%-25s\t0x%08lX [%c]\n",
 116                                 acpi_debug_layers[i].name,
 117                                 acpi_debug_layers[i].value,
 118                                 (acpi_dbg_layer & acpi_debug_layers[i].value) ?
 119                                 '*' : ' ');
 120                 }
 121                 p += sprintf(p, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
 122                         ACPI_ALL_DRIVERS,
 123                         (acpi_dbg_layer & ACPI_ALL_DRIVERS) == ACPI_ALL_DRIVERS?
 124                         '*' : (acpi_dbg_layer & ACPI_ALL_DRIVERS) == 0 ?
 125                         ' ' : '-');
 126                 p += sprintf(p,
 127                         "--\ndebug_layer = 0x%08X (* = enabled, - = partial)\n",
 128                         acpi_dbg_layer);
 129                 break;
 130         case 1:
 131                 for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
 132                         p += sprintf(p, "%-25s\t0x%08lX [%c]\n",
 133                                 acpi_debug_levels[i].name,
 134                                 acpi_debug_levels[i].value,
 135                                 (acpi_dbg_level & acpi_debug_levels[i].value) ?
 136                                 '*' : ' ');
 137                 }
 138                 p += sprintf(p, "--\ndebug_level = 0x%08X (* = enabled)\n",
 139                                 acpi_dbg_level);
 140                 break;
 141         default:
 142                 p += sprintf(p, "Invalid debug option\n");
 143                 break;
 144         }
 145
 146 end:
 147         size = (p - page);
 148         if (size <= off+count) *eof = 1;
 149         *start = page + off;
 150         size -= off;
 151         if (size>count) size = count;
 152         if (size<0) size = 0;
 153
 154         return size;
 155 }
 156
 157
 158 static int
 159 acpi_system_write_debug (
 160         struct file             *file,
 161         const char              __user *buffer,
 162         unsigned long           count,
 163         void                    *data)
 164 {
 165         char                    debug_string[12] = {'\0'};
 166
 167         ACPI_FUNCTION_TRACE("acpi_system_write_debug");
 168
 169         if (count > sizeof(debug_string) - 1)
 170                 return_VALUE(-EINVAL);
 171
 172         if (copy_from_user(debug_string, buffer, count))
 173                 return_VALUE(-EFAULT);
 174
 175         debug_string[count] = '\0';
 176
 177         switch ((unsigned long) data) {
 178         case 0:
 179                 acpi_dbg_layer = simple_strtoul(debug_string, NULL, 0);
 180                 break;
 181         case 1:
 182                 acpi_dbg_level = simple_strtoul(debug_string, NULL, 0);
 183                 break;
 184         default:
 185                 return_VALUE(-EINVAL);
 186         }
 187
 188         return_VALUE(count);
 189 }
 190
 191 static int __init acpi_debug_init(void)
 192 {
 193         struct proc_dir_entry   *entry;
 194         int error = 0;
 195         char * name;
 196
 197         ACPI_FUNCTION_TRACE("acpi_debug_init");
 198
 199         if (acpi_disabled)
 200                 return_VALUE(0);
 201
 202         /* 'debug_layer' [R/W] */
 203         name = ACPI_SYSTEM_FILE_DEBUG_LAYER;
 204         entry = create_proc_read_entry(name, S_IFREG|S_IRUGO|S_IWUSR, acpi_root_dir,
 205                                        acpi_system_read_debug,(void *)0);
 206         if (entry)
 207                 entry->write_proc = acpi_system_write_debug;
 208         else
 209                 goto Error;
 210
 211         /* 'debug_level' [R/W] */
 212         name = ACPI_SYSTEM_FILE_DEBUG_LEVEL;
 213         entry = create_proc_read_entry(name, S_IFREG|S_IRUGO|S_IWUSR, acpi_root_dir,
 214                                        acpi_system_read_debug, (void *)1);
 215         if (entry)
 216                 entry->write_proc = acpi_system_write_debug;
 217         else
 218                 goto Error;
 219
 220  Done:
 221         return_VALUE(error);
 222
 223  Error:
 224         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 225                          "Unable to create '%s' proc fs entry\n", name));
 226
 227         remove_proc_entry(ACPI_SYSTEM_FILE_DEBUG_LEVEL, acpi_root_dir);
 228         remove_proc_entry(ACPI_SYSTEM_FILE_DEBUG_LAYER, acpi_root_dir);
 229         error = -EFAULT;
 230         goto Done;
 231 }
 232
 233 subsys_initcall(acpi_debug_init);