ceph/src/dpdk/lib/librte_acl/tb_mem.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include "tb_mem.h"
  35
  36 /*
  37  *  Memory management routines for temporary memory.
  38  *  That memory is used only during build phase and is released after
  39  *  build is finished.
  40  *  Note, that tb_pool/tb_alloc() are not supposed to return NULL.
  41  *  Instead, in the case of failure to allocate memory,
  42  *  it would do siglongjmp(pool->fail).
  43  *  It is responsibility of the caller to save the proper context/environment,
  44  *  in the pool->fail before calling tb_alloc() for the given pool first time.
  45  */
  46
  47 static struct tb_mem_block *
  48 tb_pool(struct tb_mem_pool *pool, size_t sz)
  49 {
  50         struct tb_mem_block *block;
  51         uint8_t *ptr;
  52         size_t size;
  53
  54         size = sz + pool->alignment - 1;
  55         block = calloc(1, size + sizeof(*pool->block));
  56         if (block == NULL) {
  57                 RTE_LOG(ERR, MALLOC, "%s(%zu)\n failed, currently allocated "
  58                         "by pool: %zu bytes\n", __func__, sz, pool->alloc);
  59                 siglongjmp(pool->fail, -ENOMEM);
  60                 return NULL;
  61         }
  62
  63         block->pool = pool;
  64
  65         block->next = pool->block;
  66         pool->block = block;
  67
  68         pool->alloc += size;
  69
  70         ptr = (uint8_t *)(block + 1);
  71         block->mem = RTE_PTR_ALIGN_CEIL(ptr, pool->alignment);
  72         block->size = size - (block->mem - ptr);
  73
  74         return block;
  75 }
  76
  77 void *
  78 tb_alloc(struct tb_mem_pool *pool, size_t size)
  79 {
  80         struct tb_mem_block *block;
  81         void *ptr;
  82         size_t new_sz;
  83
  84         size = RTE_ALIGN_CEIL(size, pool->alignment);
  85
  86         block = pool->block;
  87         if (block == NULL || block->size < size) {
  88                 new_sz = (size > pool->min_alloc) ? size : pool->min_alloc;
  89                 block = tb_pool(pool, new_sz);
  90         }
  91         ptr = block->mem;
  92         block->size -= size;
  93         block->mem += size;
  94         return ptr;
  95 }
  96
  97 void
  98 tb_free_pool(struct tb_mem_pool *pool)
  99 {
 100         struct tb_mem_block *next, *block;
 101
 102         for (block = pool->block; block != NULL; block = next) {
 103                 next = block->next;
 104                 free(block);
 105         }
 106         pool->block = NULL;
 107         pool->alloc = 0;
 108 }