6fa679fdea
Needed for some big Opteron systems to compute a numa hash function They have more than 12 bits significant address. TBD switch this over to dynamic allocation or use better hash Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
/* K8 NUMA support */
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/* Copyright 2002,2003 by Andi Kleen, SuSE Labs */
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/* 2.5 Version loosely based on the NUMAQ Code by Pat Gaughen. */
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#ifndef _ASM_X86_64_MMZONE_H
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#define _ASM_X86_64_MMZONE_H 1
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#include <linux/config.h>
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#ifdef CONFIG_NUMA
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#define VIRTUAL_BUG_ON(x)
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#include <asm/smp.h>
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/* Should really switch to dynamic allocation at some point */
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#define NODEMAPSIZE 0x4fff
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/* Simple perfect hash to map physical addresses to node numbers */
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struct memnode {
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int shift;
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u8 map[NODEMAPSIZE];
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} ____cacheline_aligned;
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extern struct memnode memnode;
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#define memnode_shift memnode.shift
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#define memnodemap memnode.map
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extern struct pglist_data *node_data[];
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static inline __attribute__((pure)) int phys_to_nid(unsigned long addr)
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{
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unsigned nid;
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VIRTUAL_BUG_ON((addr >> memnode_shift) >= NODEMAPSIZE);
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nid = memnodemap[addr >> memnode_shift];
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VIRTUAL_BUG_ON(nid >= MAX_NUMNODES || !node_data[nid]);
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return nid;
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}
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#define NODE_DATA(nid) (node_data[nid])
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#define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
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#define node_end_pfn(nid) (NODE_DATA(nid)->node_start_pfn + \
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NODE_DATA(nid)->node_spanned_pages)
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#ifdef CONFIG_DISCONTIGMEM
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#define pfn_to_nid(pfn) phys_to_nid((unsigned long)(pfn) << PAGE_SHIFT)
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#define kvaddr_to_nid(kaddr) phys_to_nid(__pa(kaddr))
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extern int pfn_valid(unsigned long pfn);
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#endif
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#endif
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#endif
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