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debug.c

/*
 * debug.c - ACPI debug interface to userspace.
 */

#include <linux/proc_fs.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/moduleparam.h>
#include <asm/uaccess.h>
#include <acpi/acpi_drivers.h>
#include <acpi/acglobal.h>

#define _COMPONENT            ACPI_SYSTEM_COMPONENT
ACPI_MODULE_NAME("debug");

#ifdef MODULE_PARAM_PREFIX
#undef MODULE_PARAM_PREFIX
#endif
#define MODULE_PARAM_PREFIX "acpi."

struct acpi_dlayer {
      const char *name;
      unsigned long value;
};
struct acpi_dlevel {
      const char *name;
      unsigned long value;
};
#define ACPI_DEBUG_INIT(v)    { .name = #v, .value = v }

static const struct acpi_dlayer acpi_debug_layers[] = {
      ACPI_DEBUG_INIT(ACPI_UTILITIES),
      ACPI_DEBUG_INIT(ACPI_HARDWARE),
      ACPI_DEBUG_INIT(ACPI_EVENTS),
      ACPI_DEBUG_INIT(ACPI_TABLES),
      ACPI_DEBUG_INIT(ACPI_NAMESPACE),
      ACPI_DEBUG_INIT(ACPI_PARSER),
      ACPI_DEBUG_INIT(ACPI_DISPATCHER),
      ACPI_DEBUG_INIT(ACPI_EXECUTER),
      ACPI_DEBUG_INIT(ACPI_RESOURCES),
      ACPI_DEBUG_INIT(ACPI_CA_DEBUGGER),
      ACPI_DEBUG_INIT(ACPI_OS_SERVICES),
      ACPI_DEBUG_INIT(ACPI_CA_DISASSEMBLER),
      ACPI_DEBUG_INIT(ACPI_COMPILER),
      ACPI_DEBUG_INIT(ACPI_TOOLS),
};

static const struct acpi_dlevel acpi_debug_levels[] = {
      ACPI_DEBUG_INIT(ACPI_LV_ERROR),
      ACPI_DEBUG_INIT(ACPI_LV_WARN),
      ACPI_DEBUG_INIT(ACPI_LV_INIT),
      ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT),
      ACPI_DEBUG_INIT(ACPI_LV_INFO),

      ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES),
      ACPI_DEBUG_INIT(ACPI_LV_PARSE),
      ACPI_DEBUG_INIT(ACPI_LV_LOAD),
      ACPI_DEBUG_INIT(ACPI_LV_DISPATCH),
      ACPI_DEBUG_INIT(ACPI_LV_EXEC),
      ACPI_DEBUG_INIT(ACPI_LV_NAMES),
      ACPI_DEBUG_INIT(ACPI_LV_OPREGION),
      ACPI_DEBUG_INIT(ACPI_LV_BFIELD),
      ACPI_DEBUG_INIT(ACPI_LV_TABLES),
      ACPI_DEBUG_INIT(ACPI_LV_VALUES),
      ACPI_DEBUG_INIT(ACPI_LV_OBJECTS),
      ACPI_DEBUG_INIT(ACPI_LV_RESOURCES),
      ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS),
      ACPI_DEBUG_INIT(ACPI_LV_PACKAGE),

      ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS),
      ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS),
      ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS),

      ACPI_DEBUG_INIT(ACPI_LV_MUTEX),
      ACPI_DEBUG_INIT(ACPI_LV_THREADS),
      ACPI_DEBUG_INIT(ACPI_LV_IO),
      ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS),

      ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE),
      ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO),
      ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES),
      ACPI_DEBUG_INIT(ACPI_LV_EVENTS),
};

/* --------------------------------------------------------------------------
                              FS Interface (/sys)
   -------------------------------------------------------------------------- */
static int param_get_debug_layer(char *buffer, struct kernel_param *kp) {
      int result = 0;
      int i;

      result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");

      for(i = 0; i <ARRAY_SIZE(acpi_debug_layers); i++) {
            result += sprintf(buffer+result, "%-25s\t0x%08lX [%c]\n",
                              acpi_debug_layers[i].name,
                              acpi_debug_layers[i].value,
                              (acpi_dbg_layer & acpi_debug_layers[i].value) ? '*' : ' ');
      }
      result += sprintf(buffer+result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
                              ACPI_ALL_DRIVERS,
                              (acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
                              ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer &
                              ACPI_ALL_DRIVERS) == 0 ? ' ' : '-');
      result += sprintf(buffer+result, "--\ndebug_layer = 0x%08X ( * = enabled)\n", acpi_dbg_layer);

      return result;
}

static int param_get_debug_level(char *buffer, struct kernel_param *kp) {
      int result = 0;
      int i;

      result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");

      for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
            result += sprintf(buffer+result, "%-25s\t0x%08lX [%c]\n",
                             acpi_debug_levels[i].name,
                             acpi_debug_levels[i].value,
                             (acpi_dbg_level & acpi_debug_levels[i].
                              value) ? '*' : ' ');
      }
      result += sprintf(buffer+result, "--\ndebug_level = 0x%08X (* = enabled)\n",
                       acpi_dbg_level);

      return result;
}

module_param_call(debug_layer, param_set_uint, param_get_debug_layer, &acpi_dbg_layer, 0644);
module_param_call(debug_level, param_set_uint, param_get_debug_level, &acpi_dbg_level, 0644);

/* --------------------------------------------------------------------------
                              FS Interface (/proc)
   -------------------------------------------------------------------------- */
#ifdef CONFIG_ACPI_PROCFS
#define ACPI_SYSTEM_FILE_DEBUG_LAYER      "debug_layer"
#define ACPI_SYSTEM_FILE_DEBUG_LEVEL            "debug_level"

static int
acpi_system_read_debug(char *page,
                   char **start, off_t off, int count, int *eof, void *data)
{
      char *p = page;
      int size = 0;
      unsigned int i;

      if (off != 0)
            goto end;

      p += sprintf(p, "%-25s\tHex        SET\n", "Description");

      switch ((unsigned long)data) {
      case 0:
            for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) {
                  p += sprintf(p, "%-25s\t0x%08lX [%c]\n",
                             acpi_debug_layers[i].name,
                             acpi_debug_layers[i].value,
                             (acpi_dbg_layer & acpi_debug_layers[i].
                              value) ? '*' : ' ');
            }
            p += sprintf(p, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
                       ACPI_ALL_DRIVERS,
                       (acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
                       ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer &
                                           ACPI_ALL_DRIVERS) ==
                       0 ? ' ' : '-');
            p += sprintf(p,
                       "--\ndebug_layer = 0x%08X (* = enabled, - = partial)\n",
                       acpi_dbg_layer);
            break;
      case 1:
            for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
                  p += sprintf(p, "%-25s\t0x%08lX [%c]\n",
                             acpi_debug_levels[i].name,
                             acpi_debug_levels[i].value,
                             (acpi_dbg_level & acpi_debug_levels[i].
                              value) ? '*' : ' ');
            }
            p += sprintf(p, "--\ndebug_level = 0x%08X (* = enabled)\n",
                       acpi_dbg_level);
            break;
      default:
            p += sprintf(p, "Invalid debug option\n");
            break;
      }

      end:
      size = (p - page);
      if (size <= off + count)
            *eof = 1;
      *start = page + off;
      size -= off;
      if (size > count)
            size = count;
      if (size < 0)
            size = 0;

      return size;
}

static int
acpi_system_write_debug(struct file *file,
                  const char __user * buffer,
                  unsigned long count, void *data)
{
      char debug_string[12] = { '\0' };


      if (count > sizeof(debug_string) - 1)
            return -EINVAL;

      if (copy_from_user(debug_string, buffer, count))
            return -EFAULT;

      debug_string[count] = '\0';

      switch ((unsigned long)data) {
      case 0:
            acpi_dbg_layer = simple_strtoul(debug_string, NULL, 0);
            break;
      case 1:
            acpi_dbg_level = simple_strtoul(debug_string, NULL, 0);
            break;
      default:
            return -EINVAL;
      }

      return count;
}

static int __init acpi_debug_init(void)
{
      struct proc_dir_entry *entry;
      int error = 0;
      char *name;


      if (acpi_disabled)
            return 0;

      /* 'debug_layer' [R/W] */
      name = ACPI_SYSTEM_FILE_DEBUG_LAYER;
      entry =
          create_proc_read_entry(name, S_IFREG | S_IRUGO | S_IWUSR,
                           acpi_root_dir, acpi_system_read_debug,
                           (void *)0);
      if (entry)
            entry->write_proc = acpi_system_write_debug;
      else
            goto Error;

      /* 'debug_level' [R/W] */
      name = ACPI_SYSTEM_FILE_DEBUG_LEVEL;
      entry =
          create_proc_read_entry(name, S_IFREG | S_IRUGO | S_IWUSR,
                           acpi_root_dir, acpi_system_read_debug,
                           (void *)1);
      if (entry)
            entry->write_proc = acpi_system_write_debug;
      else
            goto Error;

      Done:
      return error;

      Error:
      remove_proc_entry(ACPI_SYSTEM_FILE_DEBUG_LEVEL, acpi_root_dir);
      remove_proc_entry(ACPI_SYSTEM_FILE_DEBUG_LAYER, acpi_root_dir);
      error = -ENODEV;
      goto Done;
}

subsys_initcall(acpi_debug_init);
#endif

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