utdebug.c

h内核

/******************************************************************************
 *
 * Module Name: utdebug - Debug print routines
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2005, R. Byron Moore
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <linux/module.h>

#include <acpi/acpi.h>

#define _COMPONENT          ACPI_UTILITIES
	 ACPI_MODULE_NAME    ("utdebug")


#ifdef ACPI_DEBUG_OUTPUT

static u32   acpi_gbl_prev_thread_id = 0xFFFFFFFF;
static char     *acpi_gbl_fn_entry_str = "----Entry";
static char     *acpi_gbl_fn_exit_str = "----Exit-";


/*****************************************************************************
 *
 * FUNCTION:    acpi_ut_init_stack_ptr_trace
 *
 * PARAMETERS:  None
 *
 * RETURN:      None
 *
 * DESCRIPTION: Save the current stack pointer
 *
 ****************************************************************************/

void
acpi_ut_init_stack_ptr_trace (
	void)
{
	u32                         current_sp;


	acpi_gbl_entry_stack_pointer = ACPI_PTR_DIFF (&current_sp, NULL);
}


/*****************************************************************************
 *
 * FUNCTION:    acpi_ut_track_stack_ptr
 *
 * PARAMETERS:  None
 *
 * RETURN:      None
 *
 * DESCRIPTION: Save the current stack pointer
 *
 ****************************************************************************/

void
acpi_ut_track_stack_ptr (
	void)
{
	acpi_size                   current_sp;


	current_sp = ACPI_PTR_DIFF (&current_sp, NULL);

	if (current_sp < acpi_gbl_lowest_stack_pointer) {
		acpi_gbl_lowest_stack_pointer = current_sp;
	}

	if (acpi_gbl_nesting_level > acpi_gbl_deepest_nesting) {
		acpi_gbl_deepest_nesting = acpi_gbl_nesting_level;
	}
}


/*****************************************************************************
 *
 * FUNCTION:    acpi_ut_debug_print
 *
 * PARAMETERS:  debug_level         - Requested debug print level
 *              proc_name           - Caller's procedure name
 *              module_name         - Caller's module name (for error output)
 *              line_number         - Caller's line number (for error output)
 *              component_id        - Caller's component ID (for error output)
 *
 *              Format              - Printf format field
 *              ...                 - Optional printf arguments
 *
 * RETURN:      None
 *
 * DESCRIPTION: Print error message with prefix consisting of the module name,
 *              line number, and component ID.
 *
 ****************************************************************************/

void  ACPI_INTERNAL_VAR_XFACE
acpi_ut_debug_print (
	u32                             requested_debug_level,
	u32                             line_number,
	struct acpi_debug_print_info    *dbg_info,
	char                            *format,
	...)
{
	u32                             thread_id;
	va_list                 args;


	/*
	 * Stay silent if the debug level or component ID is disabled
	 */
	if (!(requested_debug_level & acpi_dbg_level) ||
		!(dbg_info->component_id & acpi_dbg_layer)) {
		return;
	}

	/*
	 * Thread tracking and context switch notification
	 */
	thread_id = acpi_os_get_thread_id ();

	if (thread_id != acpi_gbl_prev_thread_id) {
		if (ACPI_LV_THREADS & acpi_dbg_level) {
			acpi_os_printf ("\n**** Context Switch from TID %X to TID %X ****\n\n",
				acpi_gbl_prev_thread_id, thread_id);
		}

		acpi_gbl_prev_thread_id = thread_id;
	}

	/*
	 * Display the module name, current line number, thread ID (if requested),
	 * current procedure nesting level, and the current procedure name
	 */
	acpi_os_printf ("%8s-%04ld ", dbg_info->module_name, line_number);

	if (ACPI_LV_THREADS & acpi_dbg_level) {
		acpi_os_printf ("[%04lX] ", thread_id);
	}

	acpi_os_printf ("[%02ld] %-22.22s: ", acpi_gbl_nesting_level, dbg_info->proc_name);

	va_start (args, format);
	acpi_os_vprintf (format, args);
}
EXPORT_SYMBOL(acpi_ut_debug_print);


/*****************************************************************************
 *
 * FUNCTION:    acpi_ut_debug_print_raw
 *
 * PARAMETERS:  requested_debug_level - Requested debug print level
 *              line_number         - Caller's line number
 *              dbg_info            - Contains:
 *                  proc_name           - Caller's procedure name
 *                  module_name         - Caller's module name
 *                  component_id        - Caller's component ID
 *              Format              - Printf format field
 *              ...                 - Optional printf arguments
 *
 * RETURN:      None
 *
 * DESCRIPTION: Print message with no headers.  Has same interface as
 *              debug_print so that the same macros can be used.
 *
 ****************************************************************************/

void  ACPI_INTERNAL_VAR_XFACE
acpi_ut_debug_print_raw (
	u32                             requested_debug_level,
	u32                             line_number,
	struct acpi_debug_print_info    *dbg_info,
	char                            *format,
	...)
{
	va_list                 args;


	if (!(requested_debug_level & acpi_dbg_level) ||
		!(dbg_info->component_id & acpi_dbg_layer)) {
		return;
	}

	va_start (args, format);
	acpi_os_vprintf (format, args);
}
EXPORT_SYMBOL(acpi_ut_debug_print_raw);


/*****************************************************************************
 *
 * FUNCTION:    acpi_ut_trace
 *
 * PARAMETERS:  line_number         - Caller's line number
 *              dbg_info            - Contains:
 *                  proc_name           - Caller's procedure name
 *                  module_name         - Caller's module name
 *                  component_id        - Caller's component ID
 *
 * RETURN:      None
 *
 * DESCRIPTION: Function entry trace.  Prints only if TRACE_FUNCTIONS bit is
 *              set in debug_level
 *
 ****************************************************************************/

void
acpi_ut_trace (
	u32                             line_number,
	struct acpi_debug_print_info    *dbg_info)
{

	acpi_gbl_nesting_level++;
	acpi_ut_track_stack_ptr ();

	acpi_ut_debug_print (ACPI_LV_FUNCTIONS, line_number, dbg_info,
			"%s\n", acpi_gbl_fn_entry_str);
}
EXPORT_SYMBOL(acpi_ut_trace);


/*****************************************************************************
 *
 * FUNCTION:    acpi_ut_trace_ptr
 *
 * PARAMETERS:  line_number         - Caller's line number
 *              dbg_info            - Contains:
 *                  proc_name           - Caller's procedure name
 *                  module_name         - Caller's module name
 *                  component_id        - Caller's component ID
 *              Pointer             - Pointer to display
 *
 * RETURN:      None
 *
 * DESCRIPTION: Function entry trace.  Prints only if TRACE_FUNCTIONS bit is
 *              set in debug_level
 *
 ****************************************************************************/

void
acpi_ut_trace_ptr (
	u32                             line_number,
	struct acpi_debug_print_info    *dbg_info,
	void                            *pointer)
{
	acpi_gbl_nesting_level++;
	acpi_ut_track_stack_ptr ();

	acpi_ut_debug_print (ACPI_LV_FUNCTIONS, line_number, dbg_info,
			"%s %p\n", acpi_gbl_fn_entry_str, pointer);
}


/*****************************************************************************
 *
 * FUNCTION:    acpi_ut_trace_str
 *
 * PARAMETERS:  line_number         - Caller's line number
 *              dbg_info            - Contains:
 *                  proc_name           - Caller's procedure name
 *                  module_name         - Caller's module name
 *                  component_id        - Caller's component ID
 *              String              - Additional string to display
 *
 * RETURN:      None
 *
 * DESCRIPTION: Function entry trace.  Prints only if TRACE_FUNCTIONS bit is
 *              set in debug_level
 *
 ****************************************************************************/

void
acpi_ut_trace_str (
	u32                             line_number,
	struct acpi_debug_print_info    *dbg_info,
	char                            *string)