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98d5c21c81
The powerpc kernel maintains information about logical memory blocks in the lmb.memory structure, which is initialized and updated at boot time, but not when memory is added or removed while the kernel is running. This adds a hotplug memory notifier which updates lmb.memory when memory is added or removed. This information is useful for eHEA driver to find out the memory layout and holes. NOTE: No special locking is needed for lmb_add() and lmb_remove(). Calls to these are serialized by caller. (pSeries_reconfig_chain). Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com> Cc: Yasunori Goto <y-goto@jp.fujitsu.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
86 lines
2.1 KiB
C
86 lines
2.1 KiB
C
#ifndef _LINUX_LMB_H
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#define _LINUX_LMB_H
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#ifdef __KERNEL__
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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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#define MAX_LMB_REGIONS 128
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struct lmb_property {
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u64 base;
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u64 size;
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};
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struct lmb_region {
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unsigned long cnt;
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u64 size;
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struct lmb_property region[MAX_LMB_REGIONS+1];
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};
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struct lmb {
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unsigned long debug;
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u64 rmo_size;
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struct lmb_region memory;
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struct lmb_region reserved;
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};
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extern struct lmb lmb;
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extern void __init lmb_init(void);
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extern void __init lmb_analyze(void);
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extern long lmb_add(u64 base, u64 size);
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extern long lmb_remove(u64 base, u64 size);
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extern long __init lmb_reserve(u64 base, u64 size);
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extern u64 __init lmb_alloc_nid(u64 size, u64 align, int nid,
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u64 (*nid_range)(u64, u64, int *));
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extern u64 __init lmb_alloc(u64 size, u64 align);
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extern u64 __init lmb_alloc_base(u64 size,
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u64, u64 max_addr);
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extern u64 __init __lmb_alloc_base(u64 size,
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u64 align, u64 max_addr);
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extern u64 __init lmb_phys_mem_size(void);
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extern u64 __init lmb_end_of_DRAM(void);
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extern void __init lmb_enforce_memory_limit(u64 memory_limit);
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extern int __init lmb_is_reserved(u64 addr);
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extern void lmb_dump_all(void);
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static inline u64
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lmb_size_bytes(struct lmb_region *type, unsigned long region_nr)
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{
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return type->region[region_nr].size;
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}
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static inline u64
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lmb_size_pages(struct lmb_region *type, unsigned long region_nr)
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{
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return lmb_size_bytes(type, region_nr) >> PAGE_SHIFT;
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}
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static inline u64
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lmb_start_pfn(struct lmb_region *type, unsigned long region_nr)
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{
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return type->region[region_nr].base >> PAGE_SHIFT;
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}
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static inline u64
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lmb_end_pfn(struct lmb_region *type, unsigned long region_nr)
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{
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return lmb_start_pfn(type, region_nr) +
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lmb_size_pages(type, region_nr);
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}
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#include <asm/lmb.h>
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#endif /* __KERNEL__ */
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#endif /* _LINUX_LMB_H */
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