linux_kernel/drivers/acpi/acpica/extrace.c

/******************************************************************************
 *
 * Module Name: extrace - Support for interpreter execution tracing
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2016, 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.
 */

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

#define _COMPONENT          ACPI_EXECUTER
ACPI_MODULE_NAME("extrace")

static union acpi_operand_object *acpi_gbl_trace_method_object = NULL;

/* Local prototypes */

#ifdef ACPI_DEBUG_OUTPUT
static const char *acpi_ex_get_trace_event_name(acpi_trace_event_type type);
#endif

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_interpreter_trace_enabled
 *
 * PARAMETERS:  name                - Whether method name should be matched,
 *                                    this should be checked before starting
 *                                    the tracer
 *
 * RETURN:      TRUE if interpreter trace is enabled.
 *
 * DESCRIPTION: Check whether interpreter trace is enabled
 *
 ******************************************************************************/

static u8 acpi_ex_interpreter_trace_enabled(char *name)
{

	/* Check if tracing is enabled */

	if (!(acpi_gbl_trace_flags & ACPI_TRACE_ENABLED)) {
		return (FALSE);
	}

	/*
	 * Check if tracing is filtered:
	 *
	 * 1. If the tracer is started, acpi_gbl_trace_method_object should have
	 *    been filled by the trace starter
	 * 2. If the tracer is not started, acpi_gbl_trace_method_name should be
	 *    matched if it is specified
	 * 3. If the tracer is oneshot style, acpi_gbl_trace_method_name should
	 *    not be cleared by the trace stopper during the first match
	 */
	if (acpi_gbl_trace_method_object) {
		return (TRUE);
	}

	if (name &&
	    (acpi_gbl_trace_method_name &&
	     strcmp(acpi_gbl_trace_method_name, name))) {
		return (FALSE);
	}

	if ((acpi_gbl_trace_flags & ACPI_TRACE_ONESHOT) &&
	    !acpi_gbl_trace_method_name) {
		return (FALSE);
	}

	return (TRUE);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_get_trace_event_name
 *
 * PARAMETERS:  type            - Trace event type
 *
 * RETURN:      Trace event name.
 *
 * DESCRIPTION: Used to obtain the full trace event name.
 *
 ******************************************************************************/

#ifdef ACPI_DEBUG_OUTPUT

static const char *acpi_ex_get_trace_event_name(acpi_trace_event_type type)
{

	switch (type) {
	case ACPI_TRACE_AML_METHOD:

		return "Method";

	case ACPI_TRACE_AML_OPCODE:

		return "Opcode";

	case ACPI_TRACE_AML_REGION:

		return "Region";

	default:

		return "";
	}
}

#endif

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_trace_point
 *
 * PARAMETERS:  type                - Trace event type
 *              begin               - TRUE if before execution
 *              aml                 - Executed AML address
 *              pathname            - Object path
 *
 * RETURN:      None
 *
 * DESCRIPTION: Internal interpreter execution trace.
 *
 ******************************************************************************/

void
acpi_ex_trace_point(acpi_trace_event_type type,
		    u8 begin, u8 *aml, char *pathname)
{

	ACPI_FUNCTION_NAME(ex_trace_point);

	if (pathname) {
		ACPI_DEBUG_PRINT((ACPI_DB_TRACE_POINT,
				  "%s %s [0x%p:%s] execution.\n",
				  acpi_ex_get_trace_event_name(type),
				  begin ? "Begin" : "End", aml, pathname));
	} else {
		ACPI_DEBUG_PRINT((ACPI_DB_TRACE_POINT,
				  "%s %s [0x%p] execution.\n",
				  acpi_ex_get_trace_event_name(type),
				  begin ? "Begin" : "End", aml));
	}
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_start_trace_method
 *
 * PARAMETERS:  method_node         - Node of the method
 *              obj_desc            - The method object
 *              walk_state          - current state, NULL if not yet executing
 *                                    a method.
 *
 * RETURN:      None
 *
 * DESCRIPTION: Start control method execution trace
 *
 ******************************************************************************/

void
acpi_ex_start_trace_method(struct acpi_namespace_node *method_node,
			   union acpi_operand_object *obj_desc,
			   struct acpi_walk_state *walk_state)
{
	acpi_status status;
	char *pathname = NULL;
	u8 enabled = FALSE;

	ACPI_FUNCTION_NAME(ex_start_trace_method);

	if (method_node) {
		pathname = acpi_ns_get_normalized_pathname(method_node, TRUE);
	}

	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE(status)) {
		goto exit;
	}

	enabled = acpi_ex_interpreter_trace_enabled(pathname);
	if (enabled && !acpi_gbl_trace_method_object) {
		acpi_gbl_trace_method_object = obj_desc;
		acpi_gbl_original_dbg_level = acpi_dbg_level;
		acpi_gbl_original_dbg_layer = acpi_dbg_layer;
		acpi_dbg_level = ACPI_TRACE_LEVEL_ALL;
		acpi_dbg_layer = ACPI_TRACE_LAYER_ALL;

		if (acpi_gbl_trace_dbg_level) {
			acpi_dbg_level = acpi_gbl_trace_dbg_level;
		}

		if (acpi_gbl_trace_dbg_layer) {
			acpi_dbg_layer = acpi_gbl_trace_dbg_layer;
		}
	}

	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);

exit:
	if (enabled) {
		ACPI_TRACE_POINT(ACPI_TRACE_AML_METHOD, TRUE,
				 obj_desc ? obj_desc->method.aml_start : NULL,
				 pathname);
	}

	if (pathname) {
		ACPI_FREE(pathname);
	}
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_stop_trace_method
 *
 * PARAMETERS:  method_node         - Node of the method
 *              obj_desc            - The method object
 *              walk_state          - current state, NULL if not yet executing
 *                                    a method.
 *
 * RETURN:      None
 *
 * DESCRIPTION: Stop control method execution trace
 *
 ******************************************************************************/

void
acpi_ex_stop_trace_method(struct acpi_namespace_node *method_node,
			  union acpi_operand_object *obj_desc,
			  struct acpi_walk_state *walk_state)
{
	acpi_status status;
	char *pathname = NULL;
	u8 enabled;

	ACPI_FUNCTION_NAME(ex_stop_trace_method);

	if (method_node) {
		pathname = acpi_ns_get_normalized_pathname(method_node, TRUE);
	}

	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE(status)) {
		goto exit_path;
	}

	enabled = acpi_ex_interpreter_trace_enabled(NULL);

	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);

	if (enabled) {
		ACPI_TRACE_POINT(ACPI_TRACE_AML_METHOD, FALSE,
				 obj_desc ? obj_desc->method.aml_start : NULL,
				 pathname);
	}

	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE(status)) {
		goto exit_path;
	}

	/* Check whether the tracer should be stopped */

	if (acpi_gbl_trace_method_object == obj_desc) {

		/* Disable further tracing if type is one-shot */

		if (acpi_gbl_trace_flags & ACPI_TRACE_ONESHOT) {
			acpi_gbl_trace_method_name = NULL;
		}

		acpi_dbg_level = acpi_gbl_original_dbg_level;
		acpi_dbg_layer = acpi_gbl_original_dbg_layer;
		acpi_gbl_trace_method_object = NULL;
	}

	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);

exit_path:
	if (pathname) {
		ACPI_FREE(pathname);
	}
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_start_trace_opcode
 *
 * PARAMETERS:  op                  - The parser opcode object
 *              walk_state          - current state, NULL if not yet executing
 *                                    a method.
 *
 * RETURN:      None
 *
 * DESCRIPTION: Start opcode execution trace
 *
 ******************************************************************************/

void
acpi_ex_start_trace_opcode(union acpi_parse_object *op,
			   struct acpi_walk_state *walk_state)
{

	ACPI_FUNCTION_NAME(ex_start_trace_opcode);

	if (acpi_ex_interpreter_trace_enabled(NULL) &&
	    (acpi_gbl_trace_flags & ACPI_TRACE_OPCODE)) {
		ACPI_TRACE_POINT(ACPI_TRACE_AML_OPCODE, TRUE,
				 op->common.aml, op->common.aml_op_name);
	}
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_stop_trace_opcode
 *
 * PARAMETERS:  op                  - The parser opcode object
 *              walk_state          - current state, NULL if not yet executing
 *                                    a method.
 *
 * RETURN:      None
 *
 * DESCRIPTION: Stop opcode execution trace
 *
 ******************************************************************************/

void
acpi_ex_stop_trace_opcode(union acpi_parse_object *op,
			  struct acpi_walk_state *walk_state)
{

	ACPI_FUNCTION_NAME(ex_stop_trace_opcode);

	if (acpi_ex_interpreter_trace_enabled(NULL) &&
	    (acpi_gbl_trace_flags & ACPI_TRACE_OPCODE)) {
		ACPI_TRACE_POINT(ACPI_TRACE_AML_OPCODE, FALSE,
				 op->common.aml, op->common.aml_op_name);
	}
}