110 lines
2.5 KiB
C
110 lines
2.5 KiB
C
/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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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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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/wcnss_wlan.h>
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#include <linux/spinlock.h>
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static DEFINE_SPINLOCK(alloc_lock);
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struct wcnss_prealloc {
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int occupied;
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unsigned int size;
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void *ptr;
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};
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/* pre-alloced mem for WLAN driver */
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static struct wcnss_prealloc wcnss_allocs[] = {
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{0, 8 * 1024, NULL},
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{0, 8 * 1024, NULL},
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{0, 8 * 1024, NULL},
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{0, 8 * 1024, NULL},
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{0, 32 * 1024, NULL},
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{0, 32 * 1024, NULL},
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{0, 32 * 1024, NULL},
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{0, 32 * 1024, NULL},
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{0, 32 * 1024, NULL},
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{0, 32 * 1024, NULL},
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{0, 32 * 1024, NULL},
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{0, 64 * 1024, NULL},
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{0, 64 * 1024, NULL},
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};
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int wcnss_prealloc_init(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(wcnss_allocs); i++) {
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wcnss_allocs[i].occupied = 0;
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wcnss_allocs[i].ptr = kmalloc(wcnss_allocs[i].size, GFP_KERNEL);
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if (wcnss_allocs[i].ptr == NULL)
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return -ENOMEM;
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}
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return 0;
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}
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void wcnss_prealloc_deinit(void)
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{
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int i = 0;
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for (i = 0; i < ARRAY_SIZE(wcnss_allocs); i++) {
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kfree(wcnss_allocs[i].ptr);
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wcnss_allocs[i].ptr = NULL;
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}
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}
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void *wcnss_prealloc_get(unsigned int size)
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{
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int i = 0;
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unsigned long flags;
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spin_lock_irqsave(&alloc_lock, flags);
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for (i = 0; i < ARRAY_SIZE(wcnss_allocs); i++) {
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if (wcnss_allocs[i].occupied)
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continue;
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if (wcnss_allocs[i].size > size) {
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/* we found the slot */
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wcnss_allocs[i].occupied = 1;
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spin_unlock_irqrestore(&alloc_lock, flags);
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return wcnss_allocs[i].ptr;
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}
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}
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spin_unlock_irqrestore(&alloc_lock, flags);
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pr_err("wcnss: %s: prealloc not available for size: %d\n",
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__func__, size);
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return NULL;
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}
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EXPORT_SYMBOL(wcnss_prealloc_get);
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int wcnss_prealloc_put(void *ptr)
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{
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int i = 0;
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unsigned long flags;
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spin_lock_irqsave(&alloc_lock, flags);
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for (i = 0; i < ARRAY_SIZE(wcnss_allocs); i++) {
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if (wcnss_allocs[i].ptr == ptr) {
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wcnss_allocs[i].occupied = 0;
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spin_unlock_irqrestore(&alloc_lock, flags);
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return 1;
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}
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}
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spin_unlock_irqrestore(&alloc_lock, flags);
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return 0;
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}
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EXPORT_SYMBOL(wcnss_prealloc_put);
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