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