362 lines
12 KiB
C
362 lines
12 KiB
C
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/*
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* Memory pools library, Public interface
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*
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* API Overview
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*
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* This package provides a memory allocation subsystem based on pools of
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* homogenous objects.
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*
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* Instrumentation is available for reporting memory utilization both
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* on a per-data-structure basis and system wide.
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*
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* There are two main types defined in this API.
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*
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* pool manager: A singleton object that acts as a factory for
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* pool allocators. It also is used for global
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* instrumentation, such as reporting all blocks
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* in use across all data structures. The pool manager
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* creates and provides individual memory pools
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* upon request to application code.
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*
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* memory pool: An object for allocating homogenous memory blocks.
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*
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* Global identifiers in this module use the following prefixes:
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* bcm_mpm_* Memory pool manager
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* bcm_mp_* Memory pool
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*
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* There are two main types of memory pools:
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*
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* prealloc: The contiguous memory block of objects can either be supplied
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* by the client or malloc'ed by the memory manager. The objects are
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* allocated out of a block of memory and freed back to the block.
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*
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* heap: The memory pool allocator uses the heap (malloc/free) for memory.
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* In this case, the pool allocator is just providing statistics
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* and instrumentation on top of the heap, without modifying the heap
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* allocation implementation.
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*
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* Copyright (C) 1999-2012, Broadcom Corporation
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*
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* Unless you and Broadcom execute a separate written software license
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* agreement governing use of this software, this software is licensed to you
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* under the terms of the GNU General Public License version 2 (the "GPL"),
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* available at http://www.broadcom.com/licenses/GPLv2.php, with the
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* following added to such license:
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*
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* As a special exception, the copyright holders of this software give you
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* permission to link this software with independent modules, and to copy and
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* distribute the resulting executable under terms of your choice, provided that
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* you also meet, for each linked independent module, the terms and conditions of
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* the license of that module. An independent module is a module which is not
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* derived from this software. The special exception does not apply to any
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* modifications of the software.
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*
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* Notwithstanding the above, under no circumstances may you combine this
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* software in any way with any other Broadcom software provided under a license
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* other than the GPL, without Broadcom's express prior written consent.
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*
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* $Id$
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*/
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#ifndef _BCM_MPOOL_PUB_H
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#define _BCM_MPOOL_PUB_H 1
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#include <typedefs.h> /* needed for uint16 */
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/*
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**************************************************************************
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*
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* Type definitions, handles
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*
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**************************************************************************
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*/
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/* Forward declaration of OSL handle. */
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struct osl_info;
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/* Forward declaration of string buffer. */
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struct bcmstrbuf;
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/*
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* Opaque type definition for the pool manager handle. This object is used for global
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* memory pool operations such as obtaining a new pool, deleting a pool, iterating and
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* instrumentation/debugging.
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*/
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struct bcm_mpm_mgr;
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typedef struct bcm_mpm_mgr *bcm_mpm_mgr_h;
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/*
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* Opaque type definition for an instance of a pool. This handle is used for allocating
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* and freeing memory through the pool, as well as management/instrumentation on this
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* specific pool.
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*/
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struct bcm_mp_pool;
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typedef struct bcm_mp_pool *bcm_mp_pool_h;
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/*
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* To make instrumentation more readable, every memory
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* pool must have a readable name. Pool names are up to
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* 8 bytes including '\0' termination. (7 printable characters.)
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*/
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#define BCM_MP_NAMELEN 8
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/*
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* Type definition for pool statistics.
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*/
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typedef struct bcm_mp_stats {
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char name[BCM_MP_NAMELEN]; /* Name of this pool. */
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unsigned int objsz; /* Object size allocated in this pool */
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uint16 nobj; /* Total number of objects in this pool */
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uint16 num_alloc; /* Number of objects currently allocated */
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uint16 high_water; /* Max number of allocated objects. */
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uint16 failed_alloc; /* Failed allocations. */
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} bcm_mp_stats_t;
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/*
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**************************************************************************
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*
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* API Routines on the pool manager.
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*
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**************************************************************************
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*/
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/*
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* bcm_mpm_init() - initialize the whole memory pool system.
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*
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* Parameters:
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* osh: INPUT Operating system handle. Needed for heap memory allocation.
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* max_pools: INPUT Maximum number of mempools supported.
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* mgr: OUTPUT The handle is written with the new pools manager object/handle.
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*
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* Returns:
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* BCME_OK Object initialized successfully. May be used.
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* BCME_NOMEM Initialization failed due to no memory. Object must not be used.
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*/
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int bcm_mpm_init(struct osl_info *osh, int max_pools, bcm_mpm_mgr_h *mgrp);
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/*
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* bcm_mpm_deinit() - de-initialize the whole memory pool system.
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*
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* Parameters:
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* mgr: INPUT Pointer to pool manager handle.
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*
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* Returns:
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* BCME_OK Memory pool manager successfully de-initialized.
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* other Indicated error occured during de-initialization.
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*/
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int bcm_mpm_deinit(bcm_mpm_mgr_h *mgrp);
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/*
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* bcm_mpm_create_prealloc_pool() - Create a new pool for fixed size objects. The
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* pool uses a contiguous block of pre-alloced
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* memory. The memory block may either be provided
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* by the client or dynamically allocated by the
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* pool manager.
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*
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* Parameters:
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* mgr: INPUT The handle to the pool manager
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* obj_sz: INPUT Size of objects that will be allocated by the new pool
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* Must be >= sizeof(void *).
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* nobj: INPUT Maximum number of concurrently existing objects to support
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* memstart INPUT Pointer to the memory to use, or NULL to malloc()
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* memsize INPUT Number of bytes referenced from memstart (for error checking).
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* Must be 0 if 'memstart' is NULL.
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* poolname INPUT For instrumentation, the name of the pool
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* newp: OUTPUT The handle for the new pool, if creation is successful
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*
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* Returns:
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* BCME_OK Pool created ok.
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* other Pool not created due to indicated error. newpoolp set to NULL.
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*
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*
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*/
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int bcm_mpm_create_prealloc_pool(bcm_mpm_mgr_h mgr,
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unsigned int obj_sz,
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int nobj,
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void *memstart,
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unsigned int memsize,
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char poolname[BCM_MP_NAMELEN],
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bcm_mp_pool_h *newp);
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/*
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* bcm_mpm_delete_prealloc_pool() - Delete a memory pool. This should only be called after
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* all memory objects have been freed back to the pool.
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*
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* Parameters:
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* mgr: INPUT The handle to the pools manager
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* pool: INPUT The handle of the pool to delete
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*
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* Returns:
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* BCME_OK Pool deleted ok.
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* other Pool not deleted due to indicated error.
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*
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*/
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int bcm_mpm_delete_prealloc_pool(bcm_mpm_mgr_h mgr, bcm_mp_pool_h *poolp);
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/*
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* bcm_mpm_create_heap_pool() - Create a new pool for fixed size objects. The memory
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* pool allocator uses the heap (malloc/free) for memory.
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* In this case, the pool allocator is just providing
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* statistics and instrumentation on top of the heap,
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* without modifying the heap allocation implementation.
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*
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* Parameters:
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* mgr: INPUT The handle to the pool manager
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* obj_sz: INPUT Size of objects that will be allocated by the new pool
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* poolname INPUT For instrumentation, the name of the pool
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* newp: OUTPUT The handle for the new pool, if creation is successful
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*
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* Returns:
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* BCME_OK Pool created ok.
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* other Pool not created due to indicated error. newpoolp set to NULL.
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*
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*
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*/
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int bcm_mpm_create_heap_pool(bcm_mpm_mgr_h mgr, unsigned int obj_sz,
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char poolname[BCM_MP_NAMELEN],
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bcm_mp_pool_h *newp);
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/*
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* bcm_mpm_delete_heap_pool() - Delete a memory pool. This should only be called after
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* all memory objects have been freed back to the pool.
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*
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* Parameters:
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* mgr: INPUT The handle to the pools manager
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* pool: INPUT The handle of the pool to delete
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*
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* Returns:
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* BCME_OK Pool deleted ok.
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* other Pool not deleted due to indicated error.
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*
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*/
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int bcm_mpm_delete_heap_pool(bcm_mpm_mgr_h mgr, bcm_mp_pool_h *poolp);
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/*
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* bcm_mpm_stats() - Return stats for all pools
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*
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* Parameters:
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* mgr: INPUT The handle to the pools manager
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* stats: OUTPUT Array of pool statistics.
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* nentries: MOD Max elements in 'stats' array on INPUT. Actual number
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* of array elements copied to 'stats' on OUTPUT.
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*
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* Returns:
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* BCME_OK Ok
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* other Error getting stats.
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*
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*/
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int bcm_mpm_stats(bcm_mpm_mgr_h mgr, bcm_mp_stats_t *stats, int *nentries);
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/*
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* bcm_mpm_dump() - Display statistics on all pools
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*
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* Parameters:
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* mgr: INPUT The handle to the pools manager
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* b: OUTPUT Output buffer.
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*
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* Returns:
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* BCME_OK Ok
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* other Error during dump.
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*
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*/
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int bcm_mpm_dump(bcm_mpm_mgr_h mgr, struct bcmstrbuf *b);
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/*
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* bcm_mpm_get_obj_size() - The size of memory objects may need to be padded to
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* compensate for alignment requirements of the objects.
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* This function provides the padded object size. If clients
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* pre-allocate a memory slab for a memory pool, the
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* padded object size should be used by the client to allocate
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* the memory slab (in order to provide sufficent space for
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* the maximum number of objects).
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*
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* Parameters:
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* mgr: INPUT The handle to the pools manager.
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* obj_sz: INPUT Input object size.
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* padded_obj_sz: OUTPUT Padded object size.
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*
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* Returns:
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* BCME_OK Ok
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* BCME_BADARG Bad arguments.
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*
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*/
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int bcm_mpm_get_obj_size(bcm_mpm_mgr_h mgr, unsigned int obj_sz, unsigned int *padded_obj_sz);
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/*
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***************************************************************************
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*
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* API Routines on a specific pool.
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*
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***************************************************************************
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*/
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/*
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* bcm_mp_alloc() - Allocate a memory pool object.
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*
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* Parameters:
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* pool: INPUT The handle to the pool.
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*
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* Returns:
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* A pointer to the new object. NULL on error.
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*
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*/
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void* bcm_mp_alloc(bcm_mp_pool_h pool);
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/*
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* bcm_mp_free() - Free a memory pool object.
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*
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* Parameters:
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* pool: INPUT The handle to the pool.
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* objp: INPUT A pointer to the object to free.
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*
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* Returns:
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* BCME_OK Ok
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* other Error during free.
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*
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*/
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int bcm_mp_free(bcm_mp_pool_h pool, void *objp);
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/*
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* bcm_mp_stats() - Return stats for this pool
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*
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* Parameters:
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* pool: INPUT The handle to the pool
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* stats: OUTPUT Pool statistics
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*
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* Returns:
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* BCME_OK Ok
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* other Error getting statistics.
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*
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*/
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int bcm_mp_stats(bcm_mp_pool_h pool, bcm_mp_stats_t *stats);
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/*
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* bcm_mp_dump() - Dump a pool
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*
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* Parameters:
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* pool: INPUT The handle to the pool
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* b OUTPUT Output buffer
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*
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* Returns:
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* BCME_OK Ok
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* other Error during dump.
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*
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*/
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int bcm_mp_dump(bcm_mp_pool_h pool, struct bcmstrbuf *b);
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#endif /* _BCM_MPOOL_PUB_H */
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