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/* SPDX-License-Identifier: GPL-2.0 */
/*
* LWIS Recycling Memory Allocator
*
* Copyright (c) 2021 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef LWIS_ALLOCATOR_H_
#define LWIS_ALLOCATOR_H_
#include <linux/mutex.h>
#include "lwis_commands.h"
#include "lwis_device.h"
struct lwis_allocator_block {
int type;
void *ptr;
struct lwis_allocator_block *next;
struct lwis_allocator_block *prev;
struct hlist_node node;
};
struct lwis_allocator_block_pool {
char name[LWIS_MAX_NAME_STRING_LEN];
struct lwis_allocator_block *free;
uint32_t free_count;
struct lwis_allocator_block *in_use;
uint32_t in_use_count;
};
struct lwis_allocator_block_mgr {
spinlock_t lock;
struct lwis_allocator_block_pool pool_4k;
struct lwis_allocator_block_pool pool_8k;
struct lwis_allocator_block_pool pool_16k;
struct lwis_allocator_block_pool pool_32k;
struct lwis_allocator_block_pool pool_64k;
struct lwis_allocator_block_pool pool_128k;
struct lwis_allocator_block_pool pool_256k;
struct lwis_allocator_block_pool pool_512k;
struct lwis_allocator_block_pool pool_large;
/* Hash table of allocated buffers keyed by allocated addresses */
DECLARE_HASHTABLE(allocated_blocks, BUFFER_HASH_BITS);
int ref_count;
};
/*
* lwis_allocator_init: Initialize the recycling memory allocator
*/
int lwis_allocator_init(struct lwis_device *lwis_dev);
/*
* lwis_allocator_release: Release the recycling memory allocator
* and its resources
*/
void lwis_allocator_release(struct lwis_device *lwis_dev);
/*
* lwis_allocator_allocate: Allocate a block from the recycling memory allocator
*/
void *lwis_allocator_allocate(struct lwis_device *lwis_dev, size_t size, gfp_t gfp_flags);
/*
* lwis_allocator_free: Free a block to the recycling memory allocator
*/
void lwis_allocator_free(struct lwis_device *lwis_dev, void *ptr);
#endif /* LWIS_ALLOCATOR_H_ */
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