utalloc.c

来自「linux 内核源代码」· C语言 代码 · 共 373 行

/******************************************************************************
 *
 * Module Name: utalloc - local memory allocation routines
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2007, 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 <acpi/acpi.h>
#include <acpi/acdebug.h>

#define _COMPONENT          ACPI_UTILITIES
ACPI_MODULE_NAME("utalloc")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_create_caches
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create all local caches
 *
 ******************************************************************************/
acpi_status acpi_ut_create_caches(void)
{
	acpi_status status;

	/* Object Caches, for frequently used objects */

	status =
	    acpi_os_create_cache("Acpi-Namespace",
				 sizeof(struct acpi_namespace_node),
				 ACPI_MAX_NAMESPACE_CACHE_DEPTH,
				 &acpi_gbl_namespace_cache);
	if (ACPI_FAILURE(status)) {
		return (status);
	}

	status =
	    acpi_os_create_cache("Acpi-State", sizeof(union acpi_generic_state),
				 ACPI_MAX_STATE_CACHE_DEPTH,
				 &acpi_gbl_state_cache);
	if (ACPI_FAILURE(status)) {
		return (status);
	}

	status =
	    acpi_os_create_cache("Acpi-Parse",
				 sizeof(struct acpi_parse_obj_common),
				 ACPI_MAX_PARSE_CACHE_DEPTH,
				 &acpi_gbl_ps_node_cache);
	if (ACPI_FAILURE(status)) {
		return (status);
	}

	status =
	    acpi_os_create_cache("Acpi-ParseExt",
				 sizeof(struct acpi_parse_obj_named),
				 ACPI_MAX_EXTPARSE_CACHE_DEPTH,
				 &acpi_gbl_ps_node_ext_cache);
	if (ACPI_FAILURE(status)) {
		return (status);
	}

	status =
	    acpi_os_create_cache("Acpi-Operand",
				 sizeof(union acpi_operand_object),
				 ACPI_MAX_OBJECT_CACHE_DEPTH,
				 &acpi_gbl_operand_cache);
	if (ACPI_FAILURE(status)) {
		return (status);
	}
#ifdef ACPI_DBG_TRACK_ALLOCATIONS

	/* Memory allocation lists */

	status = acpi_ut_create_list("Acpi-Global", 0, &acpi_gbl_global_list);
	if (ACPI_FAILURE(status)) {
		return (status);
	}

	status =
	    acpi_ut_create_list("Acpi-Namespace",
				sizeof(struct acpi_namespace_node),
				&acpi_gbl_ns_node_list);
	if (ACPI_FAILURE(status)) {
		return (status);
	}
#endif

	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_delete_caches
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Purge and delete all local caches
 *
 ******************************************************************************/

acpi_status acpi_ut_delete_caches(void)
{
#ifdef ACPI_DBG_TRACK_ALLOCATIONS
	char buffer[7];

	if (acpi_gbl_display_final_mem_stats) {
		ACPI_STRCPY(buffer, "MEMORY");
		acpi_db_display_statistics(buffer);
	}
#endif

	(void)acpi_os_delete_cache(acpi_gbl_namespace_cache);
	acpi_gbl_namespace_cache = NULL;

	(void)acpi_os_delete_cache(acpi_gbl_state_cache);
	acpi_gbl_state_cache = NULL;

	(void)acpi_os_delete_cache(acpi_gbl_operand_cache);
	acpi_gbl_operand_cache = NULL;

	(void)acpi_os_delete_cache(acpi_gbl_ps_node_cache);
	acpi_gbl_ps_node_cache = NULL;

	(void)acpi_os_delete_cache(acpi_gbl_ps_node_ext_cache);
	acpi_gbl_ps_node_ext_cache = NULL;

#ifdef ACPI_DBG_TRACK_ALLOCATIONS

	/* Debug only - display leftover memory allocation, if any */

	acpi_ut_dump_allocations(ACPI_UINT32_MAX, NULL);

	/* Free memory lists */

	ACPI_FREE(acpi_gbl_global_list);
	acpi_gbl_global_list = NULL;

	ACPI_FREE(acpi_gbl_ns_node_list);
	acpi_gbl_ns_node_list = NULL;
#endif

	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_validate_buffer
 *
 * PARAMETERS:  Buffer              - Buffer descriptor to be validated
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Perform parameter validation checks on an struct acpi_buffer
 *
 ******************************************************************************/

acpi_status acpi_ut_validate_buffer(struct acpi_buffer * buffer)
{

	/* Obviously, the structure pointer must be valid */

	if (!buffer) {
		return (AE_BAD_PARAMETER);
	}

	/* Special semantics for the length */

	if ((buffer->length == ACPI_NO_BUFFER) ||
	    (buffer->length == ACPI_ALLOCATE_BUFFER) ||
	    (buffer->length == ACPI_ALLOCATE_LOCAL_BUFFER)) {
		return (AE_OK);
	}

	/* Length is valid, the buffer pointer must be also */

	if (!buffer->pointer) {
		return (AE_BAD_PARAMETER);
	}

	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_initialize_buffer
 *
 * PARAMETERS:  Buffer              - Buffer to be validated
 *              required_length     - Length needed
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Validate that the buffer is of the required length or
 *              allocate a new buffer.  Returned buffer is always zeroed.
 *
 ******************************************************************************/

acpi_status
acpi_ut_initialize_buffer(struct acpi_buffer * buffer,
			  acpi_size required_length)
{
	acpi_status status = AE_OK;

	switch (buffer->length) {
	case ACPI_NO_BUFFER:

		/* Set the exception and returned the required length */

		status = AE_BUFFER_OVERFLOW;
		break;

	case ACPI_ALLOCATE_BUFFER:

		/* Allocate a new buffer */

		buffer->pointer = acpi_os_allocate(required_length);
		if (!buffer->pointer) {
			return (AE_NO_MEMORY);
		}

		/* Clear the buffer */

		ACPI_MEMSET(buffer->pointer, 0, required_length);
		break;

	case ACPI_ALLOCATE_LOCAL_BUFFER:

		/* Allocate a new buffer with local interface to allow tracking */

		buffer->pointer = ACPI_ALLOCATE_ZEROED(required_length);
		if (!buffer->pointer) {
			return (AE_NO_MEMORY);
		}
		break;

	default:

		/* Existing buffer: Validate the size of the buffer */

		if (buffer->length < required_length) {
			status = AE_BUFFER_OVERFLOW;
			break;
		}

		/* Clear the buffer */

		ACPI_MEMSET(buffer->pointer, 0, required_length);
		break;
	}

	buffer->length = required_length;
	return (status);
}

#ifdef NOT_USED_BY_LINUX
/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_allocate
 *
 * PARAMETERS:  Size                - Size of the allocation
 *              Component           - Component type of caller
 *              Module              - Source file name of caller
 *              Line                - Line number of caller
 *
 * RETURN:      Address of the allocated memory on success, NULL on failure.
 *
 * DESCRIPTION: Subsystem equivalent of malloc.
 *
 ******************************************************************************/

void *acpi_ut_allocate(acpi_size size, u32 component, char *module, u32 line)
{
	void *allocation;

	ACPI_FUNCTION_TRACE_U32(ut_allocate, size);

	/* Check for an inadvertent size of zero bytes */

	if (!size) {
		ACPI_WARNING((module, line,
			      "Attempt to allocate zero bytes, allocating 1 byte"));
		size = 1;
	}

	allocation = acpi_os_allocate(size);
	if (!allocation) {

		/* Report allocation error */

		ACPI_WARNING((module, line,
			      "Could not allocate size %X", (u32) size));

		return_PTR(NULL);
	}

	return_PTR(allocation);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_allocate_zeroed
 *
 * PARAMETERS:  Size                - Size of the allocation
 *              Component           - Component type of caller
 *              Module              - Source file name of caller
 *              Line                - Line number of caller
 *
 * RETURN:      Address of the allocated memory on success, NULL on failure.
 *
 * DESCRIPTION: Subsystem equivalent of calloc. Allocate and zero memory.
 *
 ******************************************************************************/

void *acpi_ut_allocate_zeroed(acpi_size size,
			      u32 component, char *module, u32 line)
{
	void *allocation;

	ACPI_FUNCTION_ENTRY();

	allocation = acpi_ut_allocate(size, component, module, line);
	if (allocation) {

		/* Clear the memory block */

		ACPI_MEMSET(allocation, 0, size);
	}

	return (allocation);
}
#endif