linux/arch/ia64/mm/numa.c
Keith Mannthey 8c2676a587 [PATCH] hot-add-mem x86_64: memory_add_physaddr_to_nid node fixup
In cases where the acpi memory-add event does not containe the pxm (node)
infomation allow the driver to look up node info based on the address.  The
acpi_get_node call returns -1 if it can't decode the pxm info, this causes
add_memory to panic.  acpi_get_node would have to decode the resource from the
handle (a lenghty proposition).  This seems to be the cleanist point to
interject the hook.

[kamezawa.hiroyu@jp.fujitsu.com: build fixes]
[y-goto@jp.fujitsu.com: build fixes]
Signed-off-by: Keith Mannthey <kmannth@us.ibm.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-10-01 00:39:18 -07:00

90 lines
2.5 KiB
C

/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* This file contains NUMA specific variables and functions which can
* be split away from DISCONTIGMEM and are used on NUMA machines with
* contiguous memory.
*
* 2002/08/07 Erich Focht <efocht@ess.nec.de>
*/
#include <linux/cpu.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/node.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/module.h>
#include <asm/mmzone.h>
#include <asm/numa.h>
/*
* The following structures are usually initialized by ACPI or
* similar mechanisms and describe the NUMA characteristics of the machine.
*/
int num_node_memblks;
struct node_memblk_s node_memblk[NR_NODE_MEMBLKS];
struct node_cpuid_s node_cpuid[NR_CPUS];
/*
* This is a matrix with "distances" between nodes, they should be
* proportional to the memory access latency ratios.
*/
u8 numa_slit[MAX_NUMNODES * MAX_NUMNODES];
/* Identify which cnode a physical address resides on */
int
paddr_to_nid(unsigned long paddr)
{
int i;
for (i = 0; i < num_node_memblks; i++)
if (paddr >= node_memblk[i].start_paddr &&
paddr < node_memblk[i].start_paddr + node_memblk[i].size)
break;
return (i < num_node_memblks) ? node_memblk[i].nid : (num_node_memblks ? -1 : 0);
}
#if defined(CONFIG_SPARSEMEM) && defined(CONFIG_NUMA)
/*
* Because of holes evaluate on section limits.
* If the section of memory exists, then return the node where the section
* resides. Otherwise return node 0 as the default. This is used by
* SPARSEMEM to allocate the SPARSEMEM sectionmap on the NUMA node where
* the section resides.
*/
int early_pfn_to_nid(unsigned long pfn)
{
int i, section = pfn >> PFN_SECTION_SHIFT, ssec, esec;
for (i = 0; i < num_node_memblks; i++) {
ssec = node_memblk[i].start_paddr >> PA_SECTION_SHIFT;
esec = (node_memblk[i].start_paddr + node_memblk[i].size +
((1L << PA_SECTION_SHIFT) - 1)) >> PA_SECTION_SHIFT;
if (section >= ssec && section < esec)
return node_memblk[i].nid;
}
return 0;
}
#ifdef CONFIG_MEMORY_HOTPLUG
/*
* SRAT information is stored in node_memblk[], then we can use SRAT
* information at memory-hot-add if necessary.
*/
int memory_add_physaddr_to_nid(u64 addr)
{
int nid = paddr_to_nid(addr);
if (nid < 0)
return 0;
return nid;
}
EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
#endif
#endif