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![Yinghai Lu](/assets/img/avatar_default.png)
We need to round memory regions correctly -- specifically, we need to round reserved region in the more expansive direction (lower limit down, upper limit up) whereas usable memory regions need to be rounded in the more restrictive direction (lower limit up, upper limit down). This introduces two set of inlines: memblock_region_memory_base_pfn() memblock_region_memory_end_pfn() memblock_region_reserved_base_pfn() memblock_region_reserved_end_pfn() Although they are antisymmetric (and therefore are technically duplicates) the use of the different inlines explicitly documents the programmer's intention. The lack of proper rounding caused a bug on ARM, which was then found to also affect other architectures. Reported-by: Russell King <rmk@arm.linux.org.uk> Signed-off-by: Yinghai Lu <yinghai@kernel.org> LKML-Reference: <4CB4CDFD.4020105@kernel.org> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
167 lines
5 KiB
C
167 lines
5 KiB
C
#ifndef _LINUX_MEMBLOCK_H
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#define _LINUX_MEMBLOCK_H
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#ifdef __KERNEL__
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#ifdef CONFIG_HAVE_MEMBLOCK
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/*
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* Logical memory blocks.
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*
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* Copyright (C) 2001 Peter Bergner, IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <asm/memblock.h>
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#define INIT_MEMBLOCK_REGIONS 128
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#define MEMBLOCK_ERROR 0
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struct memblock_region {
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phys_addr_t base;
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phys_addr_t size;
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};
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struct memblock_type {
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unsigned long cnt; /* number of regions */
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unsigned long max; /* size of the allocated array */
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struct memblock_region *regions;
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};
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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;
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struct memblock_type reserved;
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};
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extern struct memblock memblock;
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extern int memblock_debug;
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extern int memblock_can_resize;
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#define memblock_dbg(fmt, ...) \
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if (memblock_debug) printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
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u64 memblock_find_in_range(u64 start, u64 end, u64 size, u64 align);
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int memblock_free_reserved_regions(void);
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int memblock_reserve_reserved_regions(void);
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extern void memblock_init(void);
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extern void memblock_analyze(void);
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extern long memblock_add(phys_addr_t base, phys_addr_t size);
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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);
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extern long memblock_reserve(phys_addr_t base, phys_addr_t size);
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/* The numa aware allocator is only available if
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* CONFIG_ARCH_POPULATES_NODE_MAP is set
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*/
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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,
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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,
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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_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);
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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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/* Provided by the architecture */
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extern phys_addr_t memblock_nid_range(phys_addr_t start, phys_addr_t end, int *nid);
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extern int memblock_memory_can_coalesce(phys_addr_t addr1, phys_addr_t size1,
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phys_addr_t addr2, phys_addr_t size2);
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/**
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* memblock_set_current_limit - Set the current allocation limit to allow
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* limiting allocations to what is currently
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* accessible during boot
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* @limit: New limit value (physical address)
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*/
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extern void memblock_set_current_limit(phys_addr_t limit);
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/*
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* pfn conversion functions
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*
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* While the memory MEMBLOCKs should always be page aligned, the reserved
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* MEMBLOCKs may not be. This accessor attempt to provide a very clear
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* idea of what they return for such non aligned MEMBLOCKs.
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*/
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/**
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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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*/
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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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/**
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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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*/
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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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/**
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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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*/
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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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/**
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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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*/
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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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}
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#define for_each_memblock(memblock_type, region) \
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for (region = memblock.memblock_type.regions; \
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region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \
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region++)
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#ifdef ARCH_DISCARD_MEMBLOCK
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#define __init_memblock __init
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#define __initdata_memblock __initdata
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#else
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#define __init_memblock
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#define __initdata_memblock
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#endif
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#endif /* CONFIG_HAVE_MEMBLOCK */
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#endif /* __KERNEL__ */
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#endif /* _LINUX_MEMBLOCK_H */
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