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/*
*
* (C) COPYRIGHT 2014, 2017 ARM Limited. All rights reserved.
*
* This program is free software and is provided to you under the terms of the
* GNU General Public License version 2 as published by the Free Software
* Foundation, and any use by you of this program is subject to the terms
* of such GNU licence.
*
* A copy of the licence is included with the program, and can also be obtained
* from Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
/* Kernel UTF memory management functions */
#include <linux/list.h>
#include <linux/slab.h>
#include <kutf/kutf_mem.h>
/**
* struct kutf_alloc_entry - Structure representing an allocation.
* @node: List node for use with kutf_mempool.
* @data: Data area of the allocation
*/
struct kutf_alloc_entry {
struct list_head node;
u8 data[0];
};
int kutf_mempool_init(struct kutf_mempool *pool)
{
if (!pool) {
pr_err("NULL pointer passed to %s\n", __func__);
return -1;
}
INIT_LIST_HEAD(&pool->head);
mutex_init(&pool->lock);
return 0;
}
EXPORT_SYMBOL(kutf_mempool_init);
void kutf_mempool_destroy(struct kutf_mempool *pool)
{
struct list_head *remove;
struct list_head *tmp;
if (!pool) {
pr_err("NULL pointer passed to %s\n", __func__);
return;
}
mutex_lock(&pool->lock);
list_for_each_safe(remove, tmp, &pool->head) {
struct kutf_alloc_entry *remove_alloc;
remove_alloc = list_entry(remove, struct kutf_alloc_entry, node);
list_del(&remove_alloc->node);
kfree(remove_alloc);
}
mutex_unlock(&pool->lock);
}
EXPORT_SYMBOL(kutf_mempool_destroy);
void *kutf_mempool_alloc(struct kutf_mempool *pool, size_t size)
{
struct kutf_alloc_entry *ret;
if (!pool) {
pr_err("NULL pointer passed to %s\n", __func__);
goto fail_pool;
}
mutex_lock(&pool->lock);
ret = kmalloc(sizeof(*ret) + size, GFP_KERNEL);
if (!ret) {
pr_err("Failed to allocate memory\n");
goto fail_alloc;
}
INIT_LIST_HEAD(&ret->node);
list_add(&ret->node, &pool->head);
mutex_unlock(&pool->lock);
return &ret->data[0];
fail_alloc:
mutex_unlock(&pool->lock);
fail_pool:
return NULL;
}
EXPORT_SYMBOL(kutf_mempool_alloc);
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