forked from Minki/linux
2d4b1fa234
This patch is the minimal set of changes required by ia64 to use SPARSEMEM. Signed-off-by: Bob Picco <bob.picco@hp.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
74 lines
2.1 KiB
C
74 lines
2.1 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/config.h>
|
|
#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 <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;
|
|
}
|
|
#endif
|