memblock.h 6.5 KB
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#ifndef _LINUX_MEMBLOCK_H
#define _LINUX_MEMBLOCK_H
#ifdef __KERNEL__

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#ifdef CONFIG_HAVE_MEMBLOCK
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/*
 * Logical memory blocks.
 *
 * Copyright (C) 2001 Peter Bergner, IBM Corp.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/init.h>
#include <linux/mm.h>

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#define INIT_MEMBLOCK_REGIONS	128
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struct memblock_region {
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	phys_addr_t base;
	phys_addr_t size;
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#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
	int nid;
#endif
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};

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struct memblock_type {
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	unsigned long cnt;	/* number of regions */
	unsigned long max;	/* size of the allocated array */
	struct memblock_region *regions;
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};

struct memblock {
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	phys_addr_t current_limit;
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	phys_addr_t memory_size;	/* Updated by memblock_analyze() */
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	struct memblock_type memory;
	struct memblock_type reserved;
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};

extern struct memblock memblock;
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extern int memblock_debug;
extern int memblock_can_resize;

#define memblock_dbg(fmt, ...) \
	if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
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phys_addr_t memblock_find_in_range(phys_addr_t start, phys_addr_t end,
				   phys_addr_t size, phys_addr_t align);
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int memblock_free_reserved_regions(void);
int memblock_reserve_reserved_regions(void);
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extern void memblock_init(void);
extern void memblock_analyze(void);
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extern long memblock_add(phys_addr_t base, phys_addr_t size);
extern long memblock_remove(phys_addr_t base, phys_addr_t size);
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extern long memblock_free(phys_addr_t base, phys_addr_t size);
extern long memblock_reserve(phys_addr_t base, phys_addr_t size);
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extern void __next_free_mem_range(u64 *idx, int nid, phys_addr_t *out_start,
				  phys_addr_t *out_end, int *out_nid);

/**
 * for_each_free_mem_range - iterate through free memblock areas
 * @i: u64 used as loop variable
 * @nid: node selector, %MAX_NUMNODES for all nodes
 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL
 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL
 * @p_nid: ptr to int for nid of the range, can be %NULL
 *
 * Walks over free (memory && !reserved) areas of memblock.  Available as
 * soon as memblock is initialized.
 */
#define for_each_free_mem_range(i, nid, p_start, p_end, p_nid)		\
	for (i = 0,							\
	     __next_free_mem_range(&i, nid, p_start, p_end, p_nid);	\
	     i != (u64)ULLONG_MAX;					\
	     __next_free_mem_range(&i, nid, p_start, p_end, p_nid))

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#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
extern int memblock_set_node(phys_addr_t base, phys_addr_t size, int nid);

static inline void memblock_set_region_node(struct memblock_region *r, int nid)
{
	r->nid = nid;
}

static inline int memblock_get_region_node(const struct memblock_region *r)
{
	return r->nid;
}
#else
static inline void memblock_set_region_node(struct memblock_region *r, int nid)
{
}

static inline int memblock_get_region_node(const struct memblock_region *r)
{
	return 0;
}
#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */

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/* The numa aware allocator is only available if
 * CONFIG_ARCH_POPULATES_NODE_MAP is set
 */
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extern phys_addr_t memblock_find_in_range_node(phys_addr_t start,
					       phys_addr_t end,
					       phys_addr_t size,
					       phys_addr_t align, int nid);
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extern phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align,
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					int nid);
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extern phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align,
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					    int nid);

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extern phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align);
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/* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
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#define MEMBLOCK_ALLOC_ANYWHERE	(~(phys_addr_t)0)
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#define MEMBLOCK_ALLOC_ACCESSIBLE	0

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extern phys_addr_t memblock_alloc_base(phys_addr_t size,
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					 phys_addr_t align,
					 phys_addr_t max_addr);
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extern phys_addr_t __memblock_alloc_base(phys_addr_t size,
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					   phys_addr_t align,
					   phys_addr_t max_addr);
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extern phys_addr_t memblock_phys_mem_size(void);
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extern phys_addr_t memblock_start_of_DRAM(void);
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extern phys_addr_t memblock_end_of_DRAM(void);
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extern void memblock_enforce_memory_limit(phys_addr_t memory_limit);
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extern int memblock_is_memory(phys_addr_t addr);
extern int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
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extern int memblock_is_reserved(phys_addr_t addr);
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extern int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size);
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extern void memblock_dump_all(void);

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/**
 * memblock_set_current_limit - Set the current allocation limit to allow
 *                         limiting allocations to what is currently
 *                         accessible during boot
 * @limit: New limit value (physical address)
 */
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extern void memblock_set_current_limit(phys_addr_t limit);
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/*
 * pfn conversion functions
 *
 * While the memory MEMBLOCKs should always be page aligned, the reserved
 * MEMBLOCKs may not be. This accessor attempt to provide a very clear
 * idea of what they return for such non aligned MEMBLOCKs.
 */

/**
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 * memblock_region_memory_base_pfn - Return the lowest pfn intersecting with the memory region
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 * @reg: memblock_region structure
 */
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static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg)
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{
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	return PFN_UP(reg->base);
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}

/**
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 * memblock_region_memory_end_pfn - Return the end_pfn this region
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 * @reg: memblock_region structure
 */
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static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg)
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{
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	return PFN_DOWN(reg->base + reg->size);
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}

/**
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 * memblock_region_reserved_base_pfn - Return the lowest pfn intersecting with the reserved region
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 * @reg: memblock_region structure
 */
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static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg)
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{
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	return PFN_DOWN(reg->base);
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}

/**
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 * memblock_region_reserved_end_pfn - Return the end_pfn this region
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 * @reg: memblock_region structure
 */
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static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg)
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{
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	return PFN_UP(reg->base + reg->size);
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}

#define for_each_memblock(memblock_type, region)					\
	for (region = memblock.memblock_type.regions;				\
	     region < (memblock.memblock_type.regions + memblock.memblock_type.cnt);	\
	     region++)


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#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
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#define __init_memblock __meminit
#define __initdata_memblock __meminitdata
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#else
#define __init_memblock
#define __initdata_memblock
#endif

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#else
static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align)
{
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	return 0;
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}

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#endif /* CONFIG_HAVE_MEMBLOCK */

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#endif /* __KERNEL__ */

#endif /* _LINUX_MEMBLOCK_H */