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[PATCH] ppc64: sparsemem memory model

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Provide the architecture specific implementation for SPARSEMEM for PPC64
systems.

Signed-off-by: Andy Whitcroft <[email protected]>
Signed-off-by: Dave Hansen <[email protected]>
Signed-off-by: Mike Kravetz <[email protected]> (in part)
Signed-off-by: Martin Bligh <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Andy Whitcroft 2005-06-23 00:08:03 -07:00 • committed by Linus Torvalds
commit 145e664231
7 changed files with 68 additions and 21 deletions
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36
include/asm-ppc64/mmzone.h
View file

@ -10,9 +10,20 @@
#include <linux/config.h>
#include <asm/smp.h>
#ifdef CONFIG_DISCONTIGMEM
/* generic non-linear memory support:
*
* 1) we will not split memory into more chunks than will fit into the
* flags field of the struct page
*/
#ifdef CONFIG_NEED_MULTIPLE_NODES
extern struct pglist_data *node_data[];
/*
* Return a pointer to the node data for node n.
*/
#define NODE_DATA(nid) (node_data[nid])
/*
* Following are specific to this numa platform.
@ -47,30 +58,27 @@ static inline int pa_to_nid(unsigned long pa)
return nid;
}
#define pfn_to_nid(pfn) pa_to_nid((pfn) << PAGE_SHIFT)
/*
* Return a pointer to the node data for node n.
*/
#define NODE_DATA(nid) (node_data[nid])
#define node_localnr(pfn, nid) ((pfn) - NODE_DATA(nid)->node_start_pfn)
/*
* Following are macros that each numa implmentation must define.
*/
/*
* Given a kernel address, find the home node of the underlying memory.
*/
#define kvaddr_to_nid(kaddr) pa_to_nid(__pa(kaddr))
#define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
#define node_end_pfn(nid) (NODE_DATA(nid)->node_end_pfn)
#define local_mapnr(kvaddr) \
( (__pa(kvaddr) >> PAGE_SHIFT) - node_start_pfn(kvaddr_to_nid(kvaddr))
#ifdef CONFIG_DISCONTIGMEM
/*
* Given a kernel address, find the home node of the underlying memory.
*/
#define kvaddr_to_nid(kaddr) pa_to_nid(__pa(kaddr))
#define pfn_to_nid(pfn) pa_to_nid((unsigned long)(pfn) << PAGE_SHIFT)
/* Written this way to avoid evaluating arguments twice */
#define discontigmem_pfn_to_page(pfn) \
({ \
@ -91,6 +99,8 @@ static inline int pa_to_nid(unsigned long pa)
#endif /* CONFIG_DISCONTIGMEM */
#endif /* CONFIG_NEED_MULTIPLE_NODES */
#ifdef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
#define early_pfn_to_nid(pfn) pa_to_nid(((unsigned long)pfn) << PAGE_SHIFT)
#endif

3
include/asm-ppc64/page.h
View file

@ -217,7 +217,8 @@ extern u64 ppc64_pft_size; /* Log 2 of page table size */
#define page_to_pfn(page) discontigmem_page_to_pfn(page)
#define pfn_to_page(pfn) discontigmem_pfn_to_page(pfn)
#define pfn_valid(pfn) discontigmem_pfn_valid(pfn)
#else
#endif
#ifdef CONFIG_FLATMEM
#define pfn_to_page(pfn) (mem_map + (pfn))
#define page_to_pfn(page) ((unsigned long)((page) - mem_map))
#define pfn_valid(pfn) ((pfn) < max_mapnr)

16
include/asm-ppc64/sparsemem.h Normal file
View file

@ -0,0 +1,16 @@
#ifndef _ASM_PPC64_SPARSEMEM_H
#define _ASM_PPC64_SPARSEMEM_H 1
#ifdef CONFIG_SPARSEMEM
/*
* SECTION_SIZE_BITS 2^N: how big each section will be
* MAX_PHYSADDR_BITS 2^N: how much physical address space we have
* MAX_PHYSMEM_BITS 2^N: how much memory we can have in that space
*/
#define SECTION_SIZE_BITS 24
#define MAX_PHYSADDR_BITS 38
#define MAX_PHYSMEM_BITS 36
#endif /* CONFIG_SPARSEMEM */
#endif /* _ASM_PPC64_SPARSEMEM_H */