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/* Copyright (c) 2012,2014, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/wcnss_wlan.h>
#include <linux/spinlock.h>
static DEFINE_SPINLOCK(alloc_lock);
struct wcnss_prealloc {
int occupied;
unsigned int size;
void *ptr;
};
/* pre-alloced mem for WLAN driver */
static struct wcnss_prealloc wcnss_allocs[] = {
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 12 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 24 * 1024, NULL},
{0, 24 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 64 * 1024, NULL},
{0, 64 * 1024, NULL},
{0, 76 * 1024, NULL},
};
int wcnss_prealloc_init(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(wcnss_allocs); i++) {
wcnss_allocs[i].occupied = 0;
wcnss_allocs[i].ptr = kmalloc(wcnss_allocs[i].size, GFP_KERNEL);
if (wcnss_allocs[i].ptr == NULL)
return -ENOMEM;
}
return 0;
}
void wcnss_prealloc_deinit(void)
{
int i = 0;
for (i = 0; i < ARRAY_SIZE(wcnss_allocs); i++) {
kfree(wcnss_allocs[i].ptr);
wcnss_allocs[i].ptr = NULL;
}
}
void *wcnss_prealloc_get(unsigned int size)
{
int i = 0;
unsigned long flags;
spin_lock_irqsave(&alloc_lock, flags);
for (i = 0; i < ARRAY_SIZE(wcnss_allocs); i++) {
if (wcnss_allocs[i].occupied)
continue;
if (wcnss_allocs[i].size > size) {
/* we found the slot */
wcnss_allocs[i].occupied = 1;
spin_unlock_irqrestore(&alloc_lock, flags);
return wcnss_allocs[i].ptr;
}
}
spin_unlock_irqrestore(&alloc_lock, flags);
pr_err("wcnss: %s: prealloc not available for size: %d\n",
__func__, size);
return NULL;
}
EXPORT_SYMBOL(wcnss_prealloc_get);
int wcnss_prealloc_put(void *ptr)
{
int i = 0;
unsigned long flags;
spin_lock_irqsave(&alloc_lock, flags);
for (i = 0; i < ARRAY_SIZE(wcnss_allocs); i++) {
if (wcnss_allocs[i].ptr == ptr) {
wcnss_allocs[i].occupied = 0;
spin_unlock_irqrestore(&alloc_lock, flags);
return 1;
}
}
spin_unlock_irqrestore(&alloc_lock, flags);
return 0;
}
EXPORT_SYMBOL(wcnss_prealloc_put);
static int __init wcnss_pre_alloc_init(void)
{
return wcnss_prealloc_init();
}
static void __exit wcnss_pre_alloc_exit(void)
{
wcnss_prealloc_deinit();
}
module_init(wcnss_pre_alloc_init);
module_exit(wcnss_pre_alloc_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION(DEVICE "WCNSS Prealloc Driver");
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