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
  13 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
  14 ACPI_MODULE_NAME("debug");
  15
  16 #ifdef MODULE_PARAM_PREFIX
  17 #undef MODULE_PARAM_PREFIX
  18 #endif
  19 #define MODULE_PARAM_PREFIX "acpi."
  20
  21 struct acpi_dlayer {
  22         const char *name;
  23         unsigned long value;
  24 };
  25 struct acpi_dlevel {
  26         const char *name;
  27         unsigned long value;
  28 };
  29 #define ACPI_DEBUG_INIT(v)      { .name = #v, .value = v }
  30
  31 static const struct acpi_dlayer acpi_debug_layers[] = {
  32         ACPI_DEBUG_INIT(ACPI_UTILITIES),
  33         ACPI_DEBUG_INIT(ACPI_HARDWARE),
  34         ACPI_DEBUG_INIT(ACPI_EVENTS),
  35         ACPI_DEBUG_INIT(ACPI_TABLES),
  36         ACPI_DEBUG_INIT(ACPI_NAMESPACE),
  37         ACPI_DEBUG_INIT(ACPI_PARSER),
  38         ACPI_DEBUG_INIT(ACPI_DISPATCHER),
  39         ACPI_DEBUG_INIT(ACPI_EXECUTER),
  40         ACPI_DEBUG_INIT(ACPI_RESOURCES),
  41         ACPI_DEBUG_INIT(ACPI_CA_DEBUGGER),
  42         ACPI_DEBUG_INIT(ACPI_OS_SERVICES),
  43         ACPI_DEBUG_INIT(ACPI_CA_DISASSEMBLER),
  44         ACPI_DEBUG_INIT(ACPI_COMPILER),
  45         ACPI_DEBUG_INIT(ACPI_TOOLS),
  46
  47         ACPI_DEBUG_INIT(ACPI_BUS_COMPONENT),
  48         ACPI_DEBUG_INIT(ACPI_AC_COMPONENT),
  49         ACPI_DEBUG_INIT(ACPI_BATTERY_COMPONENT),
  50         ACPI_DEBUG_INIT(ACPI_BUTTON_COMPONENT),
  51         ACPI_DEBUG_INIT(ACPI_SBS_COMPONENT),
  52         ACPI_DEBUG_INIT(ACPI_FAN_COMPONENT),
  53         ACPI_DEBUG_INIT(ACPI_PCI_COMPONENT),
  54         ACPI_DEBUG_INIT(ACPI_POWER_COMPONENT),
  55         ACPI_DEBUG_INIT(ACPI_CONTAINER_COMPONENT),
  56         ACPI_DEBUG_INIT(ACPI_SYSTEM_COMPONENT),
  57         ACPI_DEBUG_INIT(ACPI_THERMAL_COMPONENT),
  58         ACPI_DEBUG_INIT(ACPI_MEMORY_DEVICE_COMPONENT),
  59         ACPI_DEBUG_INIT(ACPI_VIDEO_COMPONENT),
  60         ACPI_DEBUG_INIT(ACPI_PROCESSOR_COMPONENT),
  61 };
  62
  63 static const struct acpi_dlevel acpi_debug_levels[] = {
  64         ACPI_DEBUG_INIT(ACPI_LV_INIT),
  65         ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT),
  66         ACPI_DEBUG_INIT(ACPI_LV_INFO),
  67
  68         ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES),
  69         ACPI_DEBUG_INIT(ACPI_LV_PARSE),
  70         ACPI_DEBUG_INIT(ACPI_LV_LOAD),
  71         ACPI_DEBUG_INIT(ACPI_LV_DISPATCH),
  72         ACPI_DEBUG_INIT(ACPI_LV_EXEC),
  73         ACPI_DEBUG_INIT(ACPI_LV_NAMES),
  74         ACPI_DEBUG_INIT(ACPI_LV_OPREGION),
  75         ACPI_DEBUG_INIT(ACPI_LV_BFIELD),
  76         ACPI_DEBUG_INIT(ACPI_LV_TABLES),
  77         ACPI_DEBUG_INIT(ACPI_LV_VALUES),
  78         ACPI_DEBUG_INIT(ACPI_LV_OBJECTS),
  79         ACPI_DEBUG_INIT(ACPI_LV_RESOURCES),
  80         ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS),
  81         ACPI_DEBUG_INIT(ACPI_LV_PACKAGE),
  82
  83         ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS),
  84         ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS),
  85         ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS),
  86
  87         ACPI_DEBUG_INIT(ACPI_LV_MUTEX),
  88         ACPI_DEBUG_INIT(ACPI_LV_THREADS),
  89         ACPI_DEBUG_INIT(ACPI_LV_IO),
  90         ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS),
  91
  92         ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE),
  93         ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO),
  94         ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES),
  95         ACPI_DEBUG_INIT(ACPI_LV_EVENTS),
  96 };
  97
  98 /* --------------------------------------------------------------------------
  99                               FS Interface (/sys)
 100    -------------------------------------------------------------------------- */
 101 static int param_get_debug_layer(char *buffer, struct kernel_param *kp) {
 102         int result = 0;
 103         int i;
 104
 105         result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");
 106
 107         for(i = 0; i <ARRAY_SIZE(acpi_debug_layers); i++) {
 108                 result += sprintf(buffer+result, "%-25s\t0x%08lX [%c]\n",
 109                                         acpi_debug_layers[i].name,
 110                                         acpi_debug_layers[i].value,
 111                                         (acpi_dbg_layer & acpi_debug_layers[i].value) ? '*' : ' ');
 112         }
 113         result += sprintf(buffer+result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
 114                                         ACPI_ALL_DRIVERS,
 115                                         (acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
 116                                         ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer &
 117                                         ACPI_ALL_DRIVERS) == 0 ? ' ' : '-');
 118         result += sprintf(buffer+result, "--\ndebug_layer = 0x%08X ( * = enabled)\n", acpi_dbg_layer);
 119
 120         return result;
 121 }
 122
 123 static int param_get_debug_level(char *buffer, struct kernel_param *kp) {
 124         int result = 0;
 125         int i;
 126
 127         result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");
 128
 129         for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
 130                 result += sprintf(buffer+result, "%-25s\t0x%08lX [%c]\n",
 131                                      acpi_debug_levels[i].name,
 132                                      acpi_debug_levels[i].value,
 133                                      (acpi_dbg_level & acpi_debug_levels[i].
 134                                       value) ? '*' : ' ');
 135         }
 136         result += sprintf(buffer+result, "--\ndebug_level = 0x%08X (* = enabled)\n",
 137                              acpi_dbg_level);
 138
 139         return result;
 140 }
 141
 142 module_param_call(debug_layer, param_set_uint, param_get_debug_layer, &acpi_dbg_layer, 0644);
 143 module_param_call(debug_level, param_set_uint, param_get_debug_level, &acpi_dbg_level, 0644);
 144
 145 static char trace_method_name[6];
 146 module_param_string(trace_method_name, trace_method_name, 6, 0644);
 147 static unsigned int trace_debug_layer;
 148 module_param(trace_debug_layer, uint, 0644);
 149 static unsigned int trace_debug_level;
 150 module_param(trace_debug_level, uint, 0644);
 151
 152 static int param_set_trace_state(const char *val, struct kernel_param *kp)
 153 {
 154         int result = 0;
 155
 156         if (!strncmp(val, "enable", strlen("enable") - 1)) {
 157                 result = acpi_debug_trace(trace_method_name, trace_debug_level,
 158                                           trace_debug_layer, 0);
 159                 if (result)
 160                         result = -EBUSY;
 161                 goto exit;
 162         }
 163
 164         if (!strncmp(val, "disable", strlen("disable") - 1)) {
 165                 int name = 0;
 166                 result = acpi_debug_trace((char *)&name, trace_debug_level,
 167                                           trace_debug_layer, 0);
 168                 if (result)
 169                         result = -EBUSY;
 170                 goto exit;
 171         }
 172
 173         if (!strncmp(val, "1", 1)) {
 174                 result = acpi_debug_trace(trace_method_name, trace_debug_level,
 175                                           trace_debug_layer, 1);
 176                 if (result)
 177                         result = -EBUSY;
 178                 goto exit;
 179         }
 180
 181         result = -EINVAL;
 182 exit:
 183         return result;
 184 }
 185
 186 static int param_get_trace_state(char *buffer, struct kernel_param *kp)
 187 {
 188         if (!acpi_gbl_trace_method_name)
 189                 return sprintf(buffer, "disable");
 190         else {
 191                 if (acpi_gbl_trace_flags & 1)
 192                         return sprintf(buffer, "1");
 193                 else
 194                         return sprintf(buffer, "enable");
 195         }
 196         return 0;
 197 }
 198
 199 module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
 200                   NULL, 0644);
 201
 202 /* --------------------------------------------------------------------------
 203                               FS Interface (/proc)
 204    -------------------------------------------------------------------------- */
 205 #ifdef CONFIG_ACPI_PROCFS
 206 #define ACPI_SYSTEM_FILE_DEBUG_LAYER    "debug_layer"
 207 #define ACPI_SYSTEM_FILE_DEBUG_LEVEL            "debug_level"
 208
 209 static int
 210 acpi_system_read_debug(char *page,
 211                        char **start, off_t off, int count, int *eof, void *data)
 212 {
 213         char *p = page;
 214         int size = 0;
 215         unsigned int i;
 216
 217         if (off != 0)
 218                 goto end;
 219
 220         p += sprintf(p, "%-25s\tHex        SET\n", "Description");
 221
 222         switch ((unsigned long)data) {
 223         case 0:
 224                 for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) {
 225                         p += sprintf(p, "%-25s\t0x%08lX [%c]\n",
 226                                      acpi_debug_layers[i].name,
 227                                      acpi_debug_layers[i].value,
 228                                      (acpi_dbg_layer & acpi_debug_layers[i].
 229                                       value) ? '*' : ' ');
 230                 }
 231                 p += sprintf(p, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
 232                              ACPI_ALL_DRIVERS,
 233                              (acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
 234                              ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer &
 235                                                        ACPI_ALL_DRIVERS) ==
 236                              0 ? ' ' : '-');
 237                 p += sprintf(p,
 238                              "--\ndebug_layer = 0x%08X (* = enabled, - = partial)\n",
 239                              acpi_dbg_layer);
 240                 break;
 241         case 1:
 242                 for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
 243                         p += sprintf(p, "%-25s\t0x%08lX [%c]\n",
 244                                      acpi_debug_levels[i].name,
 245                                      acpi_debug_levels[i].value,
 246                                      (acpi_dbg_level & acpi_debug_levels[i].
 247                                       value) ? '*' : ' ');
 248                 }
 249                 p += sprintf(p, "--\ndebug_level = 0x%08X (* = enabled)\n",
 250                              acpi_dbg_level);
 251                 break;
 252         default:
 253                 p += sprintf(p, "Invalid debug option\n");
 254                 break;
 255         }
 256
 257       end:
 258         size = (p - page);
 259         if (size <= off + count)
 260                 *eof = 1;
 261         *start = page + off;
 262         size -= off;
 263         if (size > count)
 264                 size = count;
 265         if (size < 0)
 266                 size = 0;
 267
 268         return size;
 269 }
 270
 271 static int
 272 acpi_system_write_debug(struct file *file,
 273                         const char __user * buffer,
 274                         unsigned long count, void *data)
 275 {
 276         char debug_string[12] = { '\0' };
 277
 278
 279         if (count > sizeof(debug_string) - 1)
 280                 return -EINVAL;
 281
 282         if (copy_from_user(debug_string, buffer, count))
 283                 return -EFAULT;
 284
 285         debug_string[count] = '\0';
 286
 287         switch ((unsigned long)data) {
 288         case 0:
 289                 acpi_dbg_layer = simple_strtoul(debug_string, NULL, 0);
 290                 break;
 291         case 1:
 292                 acpi_dbg_level = simple_strtoul(debug_string, NULL, 0);
 293                 break;
 294         default:
 295                 return -EINVAL;
 296         }
 297
 298         return count;
 299 }
 300
 301 static int __init acpi_debug_init(void)
 302 {
 303         struct proc_dir_entry *entry;
 304         int error = 0;
 305         char *name;
 306
 307
 308         if (acpi_disabled)
 309                 return 0;
 310
 311         /* 'debug_layer' [R/W] */
 312         name = ACPI_SYSTEM_FILE_DEBUG_LAYER;
 313         entry =
 314             create_proc_read_entry(name, S_IFREG | S_IRUGO | S_IWUSR,
 315                                    acpi_root_dir, acpi_system_read_debug,
 316                                    (void *)0);
 317         if (entry)
 318                 entry->write_proc = acpi_system_write_debug;
 319         else
 320                 goto Error;
 321
 322         /* 'debug_level' [R/W] */
 323         name = ACPI_SYSTEM_FILE_DEBUG_LEVEL;
 324         entry =
 325             create_proc_read_entry(name, S_IFREG | S_IRUGO | S_IWUSR,
 326                                    acpi_root_dir, acpi_system_read_debug,
 327                                    (void *)1);
 328         if (entry)
 329                 entry->write_proc = acpi_system_write_debug;
 330         else
 331                 goto Error;
 332
 333       Done:
 334         return error;
 335
 336       Error:
 337         remove_proc_entry(ACPI_SYSTEM_FILE_DEBUG_LEVEL, acpi_root_dir);
 338         remove_proc_entry(ACPI_SYSTEM_FILE_DEBUG_LAYER, acpi_root_dir);
 339         error = -ENODEV;
 340         goto Done;
 341 }
 342
 343 subsys_initcall(acpi_debug_init);
 344 #endif