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/*
* Support for Medifield PNW Camera Imaging ISP subsystem.
*
* Copyright (c) 2010 Intel Corporation. All Rights Reserved.
*
* Copyright (c) 2010 Silicon Hive www.siliconhive.com.
*
* 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.
*
* 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.
*
*
*/
#ifndef __HMM_POOL_H__
#define __HMM_POOL_H__
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/kref.h>
#include "hmm_common.h"
#include "hmm/hmm_bo.h"
#define ALLOC_PAGE_FAIL_NUM 5
enum hmm_pool_type {
HMM_POOL_TYPE_RESERVED,
HMM_POOL_TYPE_DYNAMIC,
};
/**
* struct hmm_pool_ops - memory pool callbacks.
*
* @pool_init: initialize the memory pool.
* @pool_exit: uninitialize the memory pool.
* @pool_alloc_pages: allocate pages from memory pool.
* @pool_free_pages: free pages to memory pool.
* @pool_inited: check whether memory pool is initialized.
*/
struct hmm_pool_ops {
int (*pool_init)(void **pool, unsigned int pool_size);
void (*pool_exit)(void **pool);
unsigned int (*pool_alloc_pages)(void *pool,
struct hmm_page_object *page_obj,
unsigned int size, bool cached);
void (*pool_free_pages)(void *pool,
struct hmm_page_object *page_obj);
int (*pool_inited)(void *pool);
};
struct hmm_pool {
struct hmm_pool_ops *pops;
void *pool_info;
};
/**
* struct hmm_reserved_pool_info - represents reserved pool private data.
* @pages: a array that store physical pages.
* The array is as reserved memory pool.
* @index: to indicate the first blank page number
* in reserved memory pool(pages array).
* @pgnr: the valid page amount in reserved memory
* pool.
* @list_lock: list lock is used to protect the operation
* to reserved memory pool.
* @flag: reserved memory pool state flag.
*/
struct hmm_reserved_pool_info {
struct page **pages;
unsigned int index;
unsigned int pgnr;
spinlock_t list_lock;
bool initialized;
};
/**
* struct hmm_dynamic_pool_info - represents dynamic pool private data.
* @pages_list: a list that store physical pages.
* The pages list is as dynamic memory pool.
* @list_lock: list lock is used to protect the operation
* to dynamic memory pool.
* @flag: dynamic memory pool state flag.
* @pgptr_cache: struct kmem_cache, manages a cache.
*/
struct hmm_dynamic_pool_info {
struct list_head pages_list;
/* list lock is used to protect the free pages block lists */
spinlock_t list_lock;
struct kmem_cache *pgptr_cache;
bool initialized;
unsigned int pool_size;
unsigned int pgnr;
};
struct hmm_page {
struct page *page;
struct list_head list;
};
extern struct hmm_pool_ops reserved_pops;
extern struct hmm_pool_ops dynamic_pops;
#endif
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