106 lines
2.4 KiB
C
106 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
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/*
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*
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* (C) COPYRIGHT 2014-2023 ARM Limited. All rights reserved.
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*
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* This program is free software and is provided to you under the terms of the
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* GNU General Public License version 2 as published by the Free Software
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* Foundation, and any use by you of this program is subject to the terms
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* of such GNU license.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you can access it online at
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* http://www.gnu.org/licenses/gpl-2.0.html.
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*
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*/
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/* Kernel UTF memory management functions */
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <kutf/kutf_mem.h>
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/**
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* struct kutf_alloc_entry - Structure representing an allocation.
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* @node: List node for use with kutf_mempool.
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* @data: Data area of the allocation
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*/
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struct kutf_alloc_entry {
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struct list_head node;
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u8 data[0];
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};
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int kutf_mempool_init(struct kutf_mempool *pool)
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{
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if (!pool) {
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pr_err("NULL pointer passed to %s\n", __func__);
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return -1;
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}
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INIT_LIST_HEAD(&pool->head);
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mutex_init(&pool->lock);
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return 0;
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}
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EXPORT_SYMBOL(kutf_mempool_init);
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void kutf_mempool_destroy(struct kutf_mempool *pool)
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{
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struct list_head *remove;
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struct list_head *tmp;
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if (!pool) {
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pr_err("NULL pointer passed to %s\n", __func__);
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return;
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}
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mutex_lock(&pool->lock);
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list_for_each_safe(remove, tmp, &pool->head) {
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struct kutf_alloc_entry *remove_alloc;
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remove_alloc = list_entry(remove, struct kutf_alloc_entry, node);
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list_del(&remove_alloc->node);
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kfree(remove_alloc);
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}
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mutex_unlock(&pool->lock);
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}
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EXPORT_SYMBOL(kutf_mempool_destroy);
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void *kutf_mempool_alloc(struct kutf_mempool *pool, size_t size)
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{
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struct kutf_alloc_entry *ret;
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if (!pool) {
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pr_err("NULL pointer passed to %s\n", __func__);
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goto fail_pool;
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}
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mutex_lock(&pool->lock);
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ret = kmalloc(sizeof(*ret) + size, GFP_KERNEL);
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if (!ret) {
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pr_err("Failed to allocate memory\n");
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goto fail_alloc;
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}
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INIT_LIST_HEAD(&ret->node);
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list_add(&ret->node, &pool->head);
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mutex_unlock(&pool->lock);
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return &ret->data[0];
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fail_alloc:
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mutex_unlock(&pool->lock);
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fail_pool:
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return NULL;
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}
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EXPORT_SYMBOL(kutf_mempool_alloc);
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