utdebug.c - Android社区 - https://www.androidos.net.cn/

Kernel | 3.18

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

/*
 * Copyright (C) 2000 - 2014, Intel Corp.
 * 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.
 */

#define EXPORT_ACPI_INTERFACES

#include <acpi/acpi.h>
#include "accommon.h"

#define _COMPONENT          ACPI_UTILITIES
ACPI_MODULE_NAME("utdebug")

#ifdef ACPI_DEBUG_OUTPUT
static acpi_thread_id acpi_gbl_prev_thread_id = (acpi_thread_id) 0xFFFFFFFF;
static char *acpi_gbl_fn_entry_str = "----Entry";
static char *acpi_gbl_fn_exit_str = "----Exit-";

/* Local prototypes */

static const char *acpi_ut_trim_function_name(const char *function_name);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_init_stack_ptr_trace
 *
 * PARAMETERS:  None
 *
 * RETURN:      None
 *
 * DESCRIPTION: Save the current CPU stack pointer at subsystem startup
 *
 ******************************************************************************/

void acpi_ut_init_stack_ptr_trace(void)
{
	acpi_size current_sp;

acpi_gbl_entry_stack_pointer = ¤t_sp;
}

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

void acpi_ut_track_stack_ptr(void)
{
	acpi_size current_sp;

if (¤t_sp < acpi_gbl_lowest_stack_pointer) {
		acpi_gbl_lowest_stack_pointer = ¤t_sp;
	}

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

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_trim_function_name
 *
 * PARAMETERS:  function_name       - Ascii string containing a procedure name
 *
 * RETURN:      Updated pointer to the function name
 *
 * DESCRIPTION: Remove the "Acpi" prefix from the function name, if present.
 *              This allows compiler macros such as __FUNCTION__ to be used
 *              with no change to the debug output.
 *
 ******************************************************************************/

static const char *acpi_ut_trim_function_name(const char *function_name)
{

/* All Function names are longer than 4 chars, check is safe */

if (*(ACPI_CAST_PTR(u32, function_name)) == ACPI_PREFIX_MIXED) {

/* This is the case where the original source has not been modified */

return (function_name + 4);
	}

if (*(ACPI_CAST_PTR(u32, function_name)) == ACPI_PREFIX_LOWER) {

/* This is the case where the source has been 'linuxized' */

return (function_name + 5);
	}

return (function_name);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_debug_print
 *
 * PARAMETERS:  requested_debug_level - Requested debug print level
 *              line_number         - Caller's line number (for error output)
 *              function_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 error message with prefix consisting of the module name,
 *              line number, and component ID.
 *
 ******************************************************************************/

void ACPI_INTERNAL_VAR_XFACE
acpi_debug_print(u32 requested_debug_level,
		 u32 line_number,
		 const char *function_name,
		 const char *module_name,
		 u32 component_id, const char *format, ...)
{
	acpi_thread_id thread_id;
	va_list args;

/* Check if debug output enabled */

if (!ACPI_IS_DEBUG_ENABLED(requested_debug_level, component_id)) {
		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 %u to TID %u ****\n\n",
			     (u32)acpi_gbl_prev_thread_id, (u32)thread_id);
		}

acpi_gbl_prev_thread_id = thread_id;
		acpi_gbl_nesting_level = 0;
	}

/*
	 * Display the module name, current line number, thread ID (if requested),
	 * current procedure nesting level, and the current procedure name
	 */
	acpi_os_printf("%9s-%04ld ", module_name, line_number);

#ifdef ACPI_APPLICATION
	/*
	 * For acpi_exec/iASL only, emit the thread ID and nesting level.
	 * Note: nesting level is really only useful during a single-thread
	 * execution. Otherwise, multiple threads will keep resetting the
	 * level.
	 */
	if (ACPI_LV_THREADS & acpi_dbg_level) {
		acpi_os_printf("[%u] ", (u32)thread_id);
	}

acpi_os_printf("[%02ld] ", acpi_gbl_nesting_level);
#endif

acpi_os_printf("%-22.22s: ", acpi_ut_trim_function_name(function_name));

va_start(args, format);
	acpi_os_vprintf(format, args);
	va_end(args);
}

ACPI_EXPORT_SYMBOL(acpi_debug_print)

/*******************************************************************************
 *
 * FUNCTION:    acpi_debug_print_raw
 *
 * PARAMETERS:  requested_debug_level - Requested debug print level
 *              line_number         - Caller's line number
 *              function_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_debug_print_raw(u32 requested_debug_level,
		     u32 line_number,
		     const char *function_name,
		     const char *module_name,
		     u32 component_id, const char *format, ...)
{
	va_list args;

/* Check if debug output enabled */

if (!ACPI_IS_DEBUG_ENABLED(requested_debug_level, component_id)) {
		return;
	}

va_start(args, format);
	acpi_os_vprintf(format, args);
	va_end(args);
}

ACPI_EXPORT_SYMBOL(acpi_debug_print_raw)

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_trace
 *
 * PARAMETERS:  line_number         - Caller's line number
 *              function_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,
	      const char *function_name,
	      const char *module_name, u32 component_id)
{

acpi_gbl_nesting_level++;
	acpi_ut_track_stack_ptr();