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/*
* xvmalloc memory allocator
*
* Copyright (C) 2008, 2009, 2010 Nitin Gupta
*
* This code is released using a dual license strategy: BSD/GPL
* You can choose the licence that better fits your requirements.
*
* Released under the terms of 3-clause BSD License
* Released under the terms of GNU General Public License Version 2.0
*/
#ifndef _XV_MALLOC_INT_H_
#define _XV_MALLOC_INT_H_
#include <linux/kernel.h>
#include <linux/types.h>
/* User configurable params */
/* Must be power of two */
#define XV_ALIGN_SHIFT 2
#define XV_ALIGN (1 << XV_ALIGN_SHIFT)
#define XV_ALIGN_MASK (XV_ALIGN - 1)
/* This must be greater than sizeof(link_free) */
#define XV_MIN_ALLOC_SIZE 32
#define XV_MAX_ALLOC_SIZE (PAGE_SIZE - XV_ALIGN)
/* Free lists are separated by FL_DELTA bytes */
#define FL_DELTA_SHIFT 3
#define FL_DELTA (1 << FL_DELTA_SHIFT)
#define FL_DELTA_MASK (FL_DELTA - 1)
#define NUM_FREE_LISTS ((XV_MAX_ALLOC_SIZE - XV_MIN_ALLOC_SIZE) \
/ FL_DELTA + 1)
#define MAX_FLI DIV_ROUND_UP(NUM_FREE_LISTS, BITS_PER_LONG)
/* End of user params */
enum blockflags {
BLOCK_FREE,
PREV_FREE,
__NR_BLOCKFLAGS,
};
#define FLAGS_MASK XV_ALIGN_MASK
#define PREV_MASK (~FLAGS_MASK)
struct freelist_entry {
struct page *page;
u16 offset;
u16 pad;
};
struct link_free {
struct page *prev_page;
struct page *next_page;
u16 prev_offset;
u16 next_offset;
};
struct block_header {
union {
/* This common header must be XV_ALIGN bytes */
u8 common[XV_ALIGN];
struct {
u16 size;
u16 prev;
};
};
struct link_free link;
};
struct xv_pool {
ulong flbitmap;
ulong slbitmap[MAX_FLI];
spinlock_t lock;
struct freelist_entry freelist[NUM_FREE_LISTS];
/* stats */
u64 total_pages;
};
#endif
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